Chatterless Countersinks™

6-Flute Design Eliminates Harmonics for Smooth Countersinking

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The Chatter-Free Difference

Resonant vibration causes chatter in rotating cutting tools, and tools with symmetrical cutting edges tend to reinforce it. Severance countersinks have staggered cutting edges that inhibit harmonic vibration.

Severance Chatterless Countersinks feature a patented 6-flute design with unequal spacing that breaks up the harmonic patterns responsible for chatter. The result is smooth, burr-free countersinks with excellent surface finish - even in interrupted cuts and difficult materials.

Symmetrical Cutting Edges

  • Multiply the frequencies at which chatter occurs
  • Chatter marks on surface
  • Rough finish, burrs
  • Tool grabbing in soft materials

Chatterless Design

  • 6 flutes break up harmonics
  • Smooth, mark-free finish
  • Clean, burr-free edges
  • Controlled cutting action
Severance Chatterless Countersinks - 6-Flute Design
Available Angles

Countersinks available in standard included angles:

  • 60° (30° per side)
  • 82° (41° per side) - Standard
  • 90° (45° per side)
  • 100° (50° per side)
  • 110° (55° per side)
  • 120° (60° per side)

Not sure which angle you need? Read the countersink angle guide

Pro Tip

82° included angle is the standard for flat-head machine screws in the USA. Use 90° for metric applications.

6-Flute HSS Chatterless Countersinks

6-Flute HSS Chatterless Countersink diagram

Premium M2 high-speed steel countersinks with the original 6-flute chatterless design, 1/8" to 3" body diameter.

Available in all 6 standard included angles. Specify angle when ordering.

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1/8"1-5/8"1-5/8"CK-1/8023700239002410024300245002470
3/16"3/16"1-1/2"1-1/2"CK-3/16023710239102411024310245102471
1/4"3/16"1-1/2"3/4"CK-1/4023720239202412024320245202472
5/16"1/4"1-3/4"7/8"CK-5/16023730239302413024330245302473
3/8"1/4"1-3/4"7/8"CK-3/8023740239402414024340245402474
1/2"3/8"2-1/8"1-1/8"CK-1/2023750239502415024350245502475
1/2"1/4"2-1/8"1-1/8"CK-1/2-1/4023760239602416024360245602476
5/8"3/8"2-3/8"1-1/8"CK-5/8023770239702417024370245702477
5/8"1/4"2-3/8"1-1/8"CK-5/8-1/4023780239802418024380245802478
3/4"1/2"2-11/16"1-5/16"CK-3/4023790239902419024390245902479
7/8"1/2"2-13/16"1-5/16"CK-7/8023800240002420024400246002480
1"1/2"2-13/16"1-5/16"CK-1023810240102421024410246102481
1-1/4"3/4"3-3/8"1-5/8"CK-1-1/4023820240202422024420246202482
1-1/2"3/4"3-1/2"1-5/8"CK-1-1/2023830240302423024430246302483
1-3/4"1"4-1/4"2-1/8"CK-1-3/4023840240402424024440246402484
2"1"4-3/8"2-1/8"CK-2023850240502425024450246502485
2-1/2"1"4-3/4"2-1/8"CK-2-1/2023860240602426024460246602486
3"1"5"2-1/8"CK-3023870240702427024470246702487
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6-Flute Carbide Chatterless Countersinks

6-Flute Carbide Chatterless Countersink

When machining hard or abrasive materials, carbide countersinks will often give 10 or more times the service life of high speed steel tools. Consider carbide for production work in cast iron, alloy steel or glass-reinforced plastics. Sizes 1/8" to 2"; all carbide countersinks over 1-1/2" diameter have individually tipped teeth.

Available in all 6 standard included angles. Specify angle when ordering.

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1/8"1-1/2"1-1/2"CK-1/8-W025200254002560025800260002620
3/16"3/16"1-1/2"1-1/2"CK-3/16-W025210254102561025810260102621
1/4"3/16"1-1/2"1-3/16"CK-1/4-W025220254202562025820260202622
5/16"1/4"2-1/4"1-3/4"CK-5/16-W025230254302563025830260302623
3/8"1/4"2-1/4"1-3/4"CK-3/8-W025240254402564025840260402624
1/2"3/8"2-1/2"2"CK-1/2-W025250254502565025850260502625
1/2"1/4"2-1/4"1-3/4"CK-1/2-W-1/4025260254602566025860260602626
5/8"3/8"2-5/8"2"CK-5/8-W025270254702567025870260702627
5/8"1/4"2-3/8"1-3/4"CK-5/8-W-1/4025280254802568025880260802628
3/4"1/2"2-3/4"2"CK-3/4-W025290254902569025890260902629
7/8"1/2"2-7/8"2"CK-7/8-W025300255002570025900261002630
1"1/2"3"2"CK-1-W025310255102571025910261102631
1-1/4"3/4"3-3/8"1-5/8"CK-1-1/4-W025320255202572025920261202632
1-1/2"3/4"3-1/2"1-5/8"CK-1-1/2-W025330255302573025930261302633
1-3/4"1"4-1/4"2-1/8"CK-1-3/4-W025340255402574025940261402634
2"1"4-3/8"2-1/8"CK-2-W025350255502575025950261502635
Request a quote for 6-Flute Carbide Chatterless Countersinks Where to buy

Double-Ended Countersinks

Double-Ended Countersink diagram

Two countersinks in one tool - when one end wears, flip it around for a fresh cutting edge. Economical for high-volume shops.

HSS Double-Ended

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"CK-1/8-DE026700268502700027150273002745
3/16"1-7/8"CK-3/16-DE026710268602701027160273102746
1/4"2"CK-1/4-DE026720268702702027170273202747
5/16"2-1/8"CK-5/16-DE026730268802703027180273302748
3/8"2-1/2"CK-3/8-DE026740268902704027190273402749
1/2"3"CK-1/2-DE026750269002705027200273502750
5/8"3-1/4"CK-5/8-DE026760269102706027210273602751
3/4"3-1/2"CK-3/4-DE026770269202707027220273702752

Carbide Double-Ended

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"CK-1/8-W-DE028200283502850028650288002895
3/16"2"CK-3/16-W-DE028210283602851028660288102896
1/4"2"CK-1/4-W-DE028220283702852028670288202897
5/16"2-1/8"CK-5/16-W-DE028230283802853028680288302898
3/8"2-1/2"CK-3/8-W-DE028240283902854028690288402899
1/2"3"CK-1/2-W-DE028250284002855028700288502900
5/8"3-1/4"CK-5/8-W-DE028260284102856028710288602901
3/4"3-1/2"CK-3/4-W-DE028270284202857028720288702902
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Threaded Shank Countersinks

Threaded Shank Countersink diagram

These countersinks have a threaded back for use with separately ordered shanks. Ideal for use on radial drills, lathes and mills. HSS only. See the straight shank and tapered shank pages for shank styles and sizes.

Body Dia. Thread OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
3/4"3/8"-241-1/2"CK-3/4-T032700328003290033000331003320
7/8"3/8"-241-1/2"CK-7/8-T032710328103291033010331103321
1"1/2"-201-1/2"CK-1-T032720328203292033020331203322
1-1/4"5/8"-181-3/4"CK-1-1/4-T032730328303293033030331303323
1-1/2"3/4"-161-7/8"CK-1-1/2-T032740328403294033040331403324
1-3/4"3/4"-162-1/8"CK-1-3/4-T032750328503295033050331503325
2"3/4"-162-1/4"CK-2-T032760328603296033060331603326
2-1/2"1"-143"CK-2-1/2-T032770328703297033070331703327
3"1-1/4"-123-1/4"CK-3-T032780328803298033080331803328
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Heavy Duty Countersinks

Heavy Duty Countersink diagram

For heavy-duty work in conjunction with the Glenzer sleeve on drill presses, lathes and screw machines. These countersinks are designed to take heavy cuts and at the same time produce a very smooth seat. HSS.

Two styles: N (without flutes) and F (with flutes). Made in 60°, 82° and 90° included angles; other angles are available as specials. Ideal for use in bushings.

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP
3/8"13/32"2-13/16"1-7/16"HD-3/8-N039200394003960
3/8"13/32"2-13/16"1-7/16"HD-3/8-F039210394103961
1/2"13/32"3-1/16"1-11/16"HD-1/2-N039220394203962
1/2"13/32"3-1/16"1-11/16"HD-1/2-F039230394303963
3/4"3/4"3-7/8"2-1/8"HD-3/4-N039240394403964
3/4"3/4"3-7/8"2-1/8"HD-3/4-F039250394503965
1"3/4"4-5/16"1-3/4"HD-1-N039260394603966
1"3/4"4-5/16"1-3/4"HD-1-F039270394703967
1-1/4"1"5"2-1/4"HD-1-1/4-N039280394803968
1-1/4"1"5"2-1/4"HD-1-1/4-F039290394903969
1-1/2"1"5-1/4"2-1/4"HD-1-1/2-N039300395003970
1-1/2"1"5-1/4"2-1/4"HD-1-1/2-F039310395103971
2"1"5-3/4"2-1/4"HD-2-N039320395203972
2"1"5-3/4"2-1/4"HD-2-F039330395303973
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Glenzer Sleeves for Heavy Duty Countersinks

Steel Morse taper sleeves (2, 3 and 4 M.T.) to be used with the Heavy Duty Countersinks above and with straight tanged shanks. Each sleeve fits one shank diameter: 13/32", 3/4" or 1".

Tool Name O.D. Taper Fits Shank Dia. Glenzer No. EDP
Glenzer Sleeve 2 M.T.2 M.T.13/32"77893236210
Glenzer Sleeve 3 M.T.3 M.T.3/4"77895436211
Glenzer Sleeve 4 M.T.4 M.T.1"77897036212
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6-Flute Chatterless Countersinks for Wheels

Severance developed the Chatterless Wheel Countersinks for the wheel manufacturing industry. They are made in the Heavy Duty style F and N and in our standard style, and have been used on semi truck and trailer wheels. Use them on off-road and heavy equipment wheels, car and truck wheels, custom wheels, brake drums, wheel components, hubs, trailer wheels and motorcycle wheels to produce a smooth seat and angle for the lug nuts.

Each wheel countersink is custom designed for the application: diameter, angle, form and radius, in high speed steel, carbide or coated. These are made to order and carry no catalog EDP numbers.

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Multi-Flute Countersinks

The catalog's Multi-Flute Countersinks are self-piloting cutters stocked in 30° C/L (60° included) and 45° C/L (90° included). Their teeth, as regularly furnished, are for quick light chamfering only, and one Inside Deburring Cutter can deburr many different hole diameters. For heavier countersinking, special arbors or special angles, send the details to our Engineering Department.

They are listed with the tube tools: solid HSS and carbide cutters on the Inside Deburring page and the threaded-back cutters on the Inside Chamfering page.

4-Flute Chatter-Free® Econo-Sinks®

Econo-Sinks have a Chatter-Free four-flute design, with four staggered cutting teeth arranged for free chip flow and rapid Chatter-Free cutting. They give better finishes, higher production and more economic value than a single flute tool. Ideal on a wide range of materials, including non-ferrous and other stringy materials and cast iron.

4-Flute Econo-Sink

Features:

  • 4-flute chatter-free design
  • Four flutes give more chip clearance than six, for stringy materials
  • Available in HSS and Carbide
  • All 6 standard included angles available
  • Sizes: HSS 1/8" to 3", carbide 1/8" to 1"

HSS Econo-Sinks

Available in all 6 standard included angles. Specify angle when ordering.

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1/8"1-5/8"1-5/8"ES-1/8009700099101012010330105401075
3/16"3/16"1-1/2"1-1/2"ES-3/16009710099201013010340105501076
1/4"3/16"1-1/2"3/4"ES-1/4009720099301014010350105601077
5/16"1/4"1-3/4"7/8"ES-5/16009730099401015010360105701078
3/8"1/4"1-3/4"7/8"ES-3/8009740099501016010370105801079
1/2"3/8"2-1/8"1-1/8"ES-1/2009760099701018010390106001081
1/2"1/4"2-1/8"1-1/8"ES-1/2-1/4009770099801019010400106101082
5/8"3/8"2-3/8"1-1/8"ES-5/8009780099901020010410106201083
5/8"1/4"2-3/8"1-1/8"ES-5/8-1/4009790100001021010420106301084
3/4"1/2"2-11/16"1-5/16"ES-3/4009800100101022010430106401085
7/8"1/2"2-13/16"1-5/16"ES-7/8009820100301024010450106601087
1"1/2"2-13/16"1-5/16"ES-1009830100401025010460106701088
1-1/4"3/4"3-3/8"1-5/8"ES-1-1/4009840100501026010470106801089
1-1/2"3/4"3-1/2"1-5/8"ES-1-1/2009850100601027010480106901090
1-3/4"1"4-1/4"2-1/8"ES-1-3/4009870100801029010500107101092
2"1"4-3/8"2-1/8"ES-2009880100901030010510107201093
2-1/2"1"4-3/4"2-1/8"ES-2-1/2009890101001031010520107301094
3"1"5"2-1/8"ES-3009900101101032010530107401095

Carbide Econo-Sinks

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1/8"1-1/2"1-1/2"ES-1/8-W011200113501150011650118001195
1/4"3/16"1-1/2"1-3/16"ES-1/4-W011210113601151011660118101196
3/8"1/4"2-1/4"1-3/4"ES-3/8-W011220113701152011670118201197
1/2"3/8"2-1/4"1-3/4"ES-1/2-W011250114001155011700118501200
5/8"3/8"2-5/8"2"ES-5/8-W011260114101156011710118601201
3/4"1/2"2-3/4"2"ES-3/4-W011270114201157011720118701202
1"1/2"3"2"ES-1-W011280114301158011730118801203

HSS Double-Ended Econo-Sinks

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"ES-1/8-DE012040121201220012280123601244
3/16"1-7/8"ES-3/16-DE012050121301221012290123701245
1/4"2"ES-1/4-DE012060121401222012300123801246
5/16"2-1/8"ES-5/16-DE012070121501223012310123901247
3/8"2-1/2"ES-3/8-DE012080121601224012320124001248
1/2"3"ES-1/2-DE012090121701225012330124101249
5/8"3-1/4"ES-5/8-DE012100121801226012340124201250
3/4"3-1/2"ES-3/4-DE012110121901227012350124301251

Carbide Double-Ended Econo-Sinks

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"ES-1/8-W-DE012520126001268012760128401292
3/16"2"ES-3/16-W-DE012530126101269012770128501293
1/4"2"ES-1/4-W-DE012540126201270012780128601294
5/16"2-1/8"ES-5/16-W-DE012550126301271012790128701295
3/8"2-1/2"ES-3/8-W-DE012560126401272012800128801296
1/2"3"ES-1/2-W-DE012570126501273012810128901297
5/8"3-1/4"ES-5/8-W-DE012580126601274012820129001298
3/4"3-1/2"ES-3/4-W-DE012590126701275012830129101299
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Single Flute Countersinks

Single Flute Countersink diagram

Single flute countersinks produce excellent results for light burr-free countersinking, are excellent at small hole chamfers, can operate at slightly higher RPM and may be reground many times. The positive shear cutting edge suits non-rigid setups and machines with less than precision spindles. Countersinks larger than 1" are not pointed but have flat ends. Available in HSS and carbide, single-ended and double-ended.

HSS Single Flute

Available in all 6 standard included angles. Specify angle when ordering.

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1/8"1-5/8"1-5/8"1/8-SF002700028800306003240034200360
3/16"3/16"1-1/2"1-1/2"3/16-SF002710028900307003250034300361
1/4"3/16"1-1/2"3/4"1/4-SF002720029000308003260034400362
5/16"1/4"1-3/4"7/8"5/16-SF002730029100309003270034500363
3/8"1/4"1-3/4"7/8"3/8-SF002740029200310003280034600364
1/2"3/8"2-1/8"1-1/8"1/2-SF002750029300311003290034700365
1/2"1/4"2-1/8"1-1/8"1/2-SF-1/4002760029400312003300034800366
5/8"3/8"2-3/8"1-1/8"5/8-SF002770029500313003310034900367
5/8"1/4"2-3/8"1-1/8"5/8-SF-1/4002780029600314003320035000368
3/4"1/2"2-11/16"1-5/16"3/4-SF002790029700315003330035100369
7/8"1/2"2-13/16"1-5/16"7/8-SF002800029800316003340035200370
1"1/2"2-13/16"1-5/16"1-SF002810029900317003350035300371
1-1/4"3/4"3-3/8"1-5/8"1-1/4-SF002820030000318003360035400372
1-1/2"3/4"3-1/2"1-5/8"1-1/2-SF002830030100319003370035500373
1-3/4"1"4-1/4"2-1/8"1-3/4-SF002840030200320003380035600374
2"1"4-3/8"2-1/8"2-SF002850030300321003390035700375
2-1/2"1"4-3/4"2-1/8"2-1/2-SF002860030400322003400035800376
3"1"5"2-1/8"3-SF002870030500323003410035900377

Carbide Single Flute

Body Dia. Shank Dia. OAL Shank Length Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1/8"1-1/2"1-1/2"1/8-SF-W004200044000460004800050000520
3/16"3/16"1-1/2"1-1/2"3/16-SF-W004210044100461004810050100521
1/4"3/16"1-1/2"1-3/16"1/4-SF-W004220044200462004820050200522
5/16"1/4"2-1/4"1-3/4"5/16-SF-W004230044300463004830050300523
3/8"1/4"2-1/4"1-3/4"3/8-SF-W004240044400464004840050400524
1/2"3/8"2-1/2"2"1/2-SF-W004250044500465004850050500525
1/2"1/4"2-1/4"1-3/4"1/2-SF-W-1/4004260044600466004860050600526
5/8"3/8"2-5/8"2"5/8-SF-W004270044700467004870050700527
5/8"1/4"2-3/8"1-3/4"5/8-SF-W-1/4004280044800468004880050800528
3/4"1/2"2-3/4"2"3/4-SF-W004290044900469004890050900529
7/8"1/2"2-7/8"2"7/8-SF-W004300045000470004900051000530
1"1/2"3"2"1-SF-W004310045100471004910051100531
1-1/4"3/4"3-3/8"1-5/8"1-1/4-SF-W004320045200472004920051200532
1-1/2"3/4"3-1/2"1-5/8"1-1/2-SF-W004330045300473004930051300533
1-3/4"1"4-1/4"2-1/8"1-3/4-SF-W004340045400474004940051400534
2"1"4-3/8"2-1/8"2-SF-W004350045500475004950051500535

HSS Single Flute Double-Ended

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"1/8-SF-DE005360054400552005600056800576
3/16"1-7/8"3/16-SF-DE005370054500553005610056900577
1/4"2"1/4-SF-DE005380054600554005620057000578
5/16"2-1/8"5/16-SF-DE005390054700555005630057100579
3/8"2-1/2"3/8-SF-DE005400054800556005640057200580
1/2"3"1/2-SF-DE005410054900557005650057300581
5/8"3-1/4"5/8-SF-DE005420055000558005660057400582
3/4"3-1/2"3/4-SF-DE005430055100559005670057500583

Carbide Single Flute Double-Ended

Body Dia. OAL Tool Name 60° EDP 82° EDP 90° EDP 100° EDP 110° EDP 120° EDP
1/8"1-1/2"1/8-SF-W-DE006000060900617006250063300641
3/16"2"3/16-SF-W-DE006010061000618006260063400642
1/4"2"1/4-SF-W-DE006020061100619006270063500643
5/16"2-1/8"5/16-SF-W-DE006030061200620006280063600644
3/8"2-1/2"3/8-SF-W-DE006040061300621006290063700645
1/2"3"1/2-SF-W-DE006050061400622006300063800646
5/8"3-1/4"5/8-SF-W-DE006060061500623006310063900647
3/4"3-1/2"3/4-SF-W-DE006070061600624006320064000648
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2N1™ Combination Countersinks

Double-ended design with a 6-flute chatterless countersink on one end and a single-flute countersink on the other — two tools in one. Choose the 6-flute end for chatter-free production work, or flip to the single-flute end for quick touch-ups. Available in 3 body sizes with 82°, 90°, and 100° included angles.

HSS construction. All models are double-ended.

Body Dia. OAL Tool Name 82° EDP 90° EDP 100° EDP
1/4"2"2N1-1/4-DE029220293202942
3/8"2-1/2"2N1-3/8-DE029240293402944
1/2"3"2N1-1/2-DE029250293502945
Additional sizes and angles available soon. Contact us for details.
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Chatter-Free® Stop-Countersink Cutters

Stop-Countersink Cutters are designed for use with Severance Precision Stop Countersink Units (SC-14 through SC-57). Available in 5 included angles with multiple pilot diameter options per body size. SC-6 through SC-12 cutters have a 1/4"-28 thread, S3-12 cutters 3/8"-24 and SC-20 cutters 7/16"-20.

Stop-Countersink Cutter

Features:

  • Threaded (1/4"-28, 3/8"-24 or 7/16"-20) to fit the SC- stop units
  • Patented 4-flute Chatter-Free flute design
  • Multiple pilot diameters per body size
  • 5 included angles: 78°, 82°, 90°, 100°, 120°
  • 6 body sizes: 3/8" (SC-6), 7/16" (SC-7), 1/2" (SC-8), 5/8" (SC-10), 3/4" (SC-12/S3-12), 1-1/4" (SC-20)
  • Available in HSS and Carbide

SC-6 Cutters (3/8" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
3/8"3/32" (.0938)1/4"-281-5/32"SC-61534015485156291577415919
3/8"#40 (.0980)1/4"-281-5/32"SC-61534115486156301577515920
3/8"1/8" (.1250)1/4"-281-5/32"SC-61534215487156311577615921
3/8"#30 (.1285)1/4"-281-5/32"SC-61534315488156321577715922
3/8"5/32" (.1562)1/4"-281-5/32"SC-61534515489156341577915924
3/8"#21 (.1590)1/4"-281-5/32"SC-61534615490156351578015925
3/8"3/16" (.1875)1/4"-281-5/32"SC-61534715491156361578115926
3/8"#10 (.1935)1/4"-281-5/32"SC-61534815492156371578215927

SC-7 Cutters (7/16" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
7/16"3/32" (.0938)1/4"-281-5/32"SC-71535015494156391578415929
7/16"#40 (.0980)1/4"-281-5/32"SC-71535115495156401578515930
7/16"1/8" (.1250)1/4"-281-5/32"SC-71535215496156411578615931
7/16"#30 (.1285)1/4"-281-5/32"SC-71535315497156421578715932
7/16"5/32" (.1562)1/4"-281-5/32"SC-71535515499156441578915934
7/16"#21 (.1590)1/4"-281-5/32"SC-71535615500156451579015935
7/16"3/16" (.1875)1/4"-281-5/32"SC-71535715501156461579115936
7/16"#10 (.1935)1/4"-281-5/32"SC-71535815502156471579215937

SC-8 Cutters (1/2" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
1/2"3/32" (.0938)1/4"-281-5/32"SC-81536015504156491579415939
1/2"#40 (.0980)1/4"-281-5/32"SC-81536115505156501579515940
1/2"1/8" (.1250)1/4"-281-5/32"SC-81536215506156511579615941
1/2"#30 (.1285)1/4"-281-5/32"SC-81536315507156521579715942
1/2"5/32" (.1562)1/4"-281-5/32"SC-81536415508156531579815943
1/2"#21 (.1590)1/4"-281-5/32"SC-81536615510156551580015945
1/2"3/16" (.1875)1/4"-281-5/32"SC-81536715511156561580115946
1/2"#10 (.1935)1/4"-281-5/32"SC-81536815512156571580215947
1/2"7/32" (.2187)1/4"-281-5/32"SC-81536915513156581580315948
1/2"1/4" (.2500)1/4"-281-5/32"SC-81537015514156591580415949

SC-10 Cutters (5/8" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
5/8"1/8" (.1250)1/4"-281-5/32"SC-101537215516156611580615951
5/8"#30 (.1285)1/4"-281-5/32"SC-101537315517156621580715952
5/8"5/32" (.1562)1/4"-281-5/32"SC-101537415518156631580815953
5/8"#21 (.1590)1/4"-281-5/32"SC-101537515519156641580915954
5/8"3/16" (.1875)1/4"-281-5/32"SC-101537615520156651581015955
5/8"#10 (.1935)1/4"-281-5/32"SC-101537815522156671581215957
5/8"7/32" (.2187)1/4"-281-5/32"SC-101537915523156681581315958
5/8"1/4" (.2500)1/4"-281-5/32"SC-101538015524156691581415959
5/8"5/16" (.3125)1/4"-281-5/32"SC-101538115525156701581515960
5/8"3/8" (.3750)1/4"-281-5/32"SC-101538215526156711581615961

SC-12 Cutters (3/4" Body, 1/4"-28 Thread)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
3/4"5/32" (.1562)1/4"-281-3/16"SC-121538415528156731581815963
3/4"#21 (.1590)1/4"-281-3/16"SC-121538515529156741581915964
3/4"3/16" (.1875)1/4"-281-3/16"SC-121538615530156751582015965
3/4"#10 (.1935)1/4"-281-3/16"SC-121538715531156761582115966
3/4"7/32" (.2187)1/4"-281-3/16"SC-121538915533156781582315968
3/4"1/4" (.2500)1/4"-281-3/16"SC-121539015534156791582415969
3/4""F" (.2570)1/4"-281-3/16"SC-121539115535156801582515970
3/4"5/16" (.3125)1/4"-281-3/16"SC-121539215536156811582615971
3/4"3/8" (.3750)1/4"-281-3/16"SC-121539315537156821582715972

S3-12 Cutters (3/4" Body, 3/8"-24 Thread)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
3/4"5/32" (.1562)3/8"-241-3/16"S3-121539515539156841582915974
3/4"#21 (.1590)3/8"-241-3/16"S3-121539615540156851583015975
3/4"3/16" (.1875)3/8"-241-3/16"S3-121539715541156861583115976
3/4"#10 (.1935)3/8"-241-3/16"S3-121539815542156871583215977
3/4"7/32" (.2187)3/8"-241-3/16"S3-121540015544156891583415979
3/4"1/4" (.2500)3/8"-241-3/16"S3-121540115545156901583515980
3/4""F" (.2570)3/8"-241-3/16"S3-121540215546156911583615981
3/4"5/16" (.3125)3/8"-241-3/16"S3-121540315547156921583715982
3/4"3/8" (.3750)3/8"-241-3/16"S3-121540415548156931583815983

SC-20 Cutters (1-1/4" Body, 7/16"-20 Thread)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
1-1/4"3/16" (.1875)7/16"-201-3/8"SC-201540615550156951584015985
1-1/4"#10 (.1935)7/16"-201-3/8"SC-201540715551156961584115986
1-1/4"7/32" (.2187)7/16"-201-3/8"SC-201540815552156971584215987
1-1/4"1/4" (.2500)7/16"-201-3/8"SC-201540915553156981584315988
1-1/4""F" (.2570)7/16"-201-3/8"SC-201541115555157001584515990
1-1/4"5/16" (.3125)7/16"-201-3/8"SC-201541215556157011584615991
1-1/4"3/8" (.3750)7/16"-201-3/8"SC-201541315557157021584715992
1-1/4"1/2" (.5000)7/16"-201-3/8"SC-201541415558157031584815993
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Carbide Stop-Countersink Cutters

Carbide Stop-Countersink Cutter

Carbide versions of the Chatter-Free® Stop-Countersink Cutters for extended tool life on harder materials and high-volume production. Same precision design as HSS with 4-flute Chatter-Free flute pattern. All standard models have 1/4"-28 threads; 3/4" body available with 3/8"-24 thread.

SC-6-W Cutters (3/8" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
3/8"3/32" (.0938)1/4"-281-5/32"SC-6-W1384013985141291427414419
3/8"#40 (.0980)1/4"-281-5/32"SC-6-W1384113986141301427514420
3/8"1/8" (.1250)1/4"-281-5/32"SC-6-W1384213987141311427614421
3/8"#30 (.1285)1/4"-281-5/32"SC-6-W1384313988141321427714422
3/8"5/32" (.1562)1/4"-281-5/32"SC-6-W1384513989141341427914424
3/8"#21 (.1590)1/4"-281-5/32"SC-6-W1384613990141351428014425
3/8"3/16" (.1875)1/4"-281-5/32"SC-6-W1384713991141361428114426
3/8"#10 (.1935)1/4"-281-5/32"SC-6-W1384813992141371428214427

SC-7-W Cutters (7/16" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
7/16"3/32" (.0938)1/4"-281-5/32"SC-7-W1385013994141391428414429
7/16"#40 (.0980)1/4"-281-5/32"SC-7-W1385113995141401428514430
7/16"1/8" (.1250)1/4"-281-5/32"SC-7-W1385213996141411428614431
7/16"#30 (.1285)1/4"-281-5/32"SC-7-W1385313997141421428714432
7/16"5/32" (.1562)1/4"-281-5/32"SC-7-W1385513999141441428914434
7/16"#21 (.1590)1/4"-281-5/32"SC-7-W1385614000141451429014435
7/16"3/16" (.1875)1/4"-281-5/32"SC-7-W1385714001141461429114436
7/16"#10 (.1935)1/4"-281-5/32"SC-7-W1385814002141471429214437

SC-8-W Cutters (1/2" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
1/2"3/32" (.0938)1/4"-281-5/32"SC-8-W1386014004141491429414439
1/2"#40 (.0980)1/4"-281-5/32"SC-8-W1386114005141501429514440
1/2"1/8" (.1250)1/4"-281-5/32"SC-8-W1386214006141511429614441
1/2"#30 (.1285)1/4"-281-5/32"SC-8-W1386314007141521429714442
1/2"5/32" (.1562)1/4"-281-5/32"SC-8-W1386414008141531429814443
1/2"#21 (.1590)1/4"-281-5/32"SC-8-W1386614010141551430014445
1/2"3/16" (.1875)1/4"-281-5/32"SC-8-W1386714011141561430114446
1/2"#10 (.1935)1/4"-281-5/32"SC-8-W1386814012141571430214447
1/2"7/32" (.2187)1/4"-281-5/32"SC-8-W1386914013141581430314448
1/2"1/4" (.2500)1/4"-281-5/32"SC-8-W1387014014141591430414449

SC-10-W Cutters (5/8" Body)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
5/8"1/8" (.1250)1/4"-281-5/32"SC-10-W1387214016141611430614451
5/8"#30 (.1285)1/4"-281-5/32"SC-10-W1387314017141621430714452
5/8"5/32" (.1562)1/4"-281-5/32"SC-10-W1387414018141631430814453
5/8"#21 (.1590)1/4"-281-5/32"SC-10-W1387514019141641430914454
5/8"3/16" (.1875)1/4"-281-5/32"SC-10-W1387614020141651431014455
5/8"#10 (.1935)1/4"-281-5/32"SC-10-W1387814022141671431214457
5/8"7/32" (.2187)1/4"-281-5/32"SC-10-W1387914023141681431314458
5/8"1/4" (.2500)1/4"-281-5/32"SC-10-W1388014024141691431414459
5/8"5/16" (.3125)1/4"-281-5/32"SC-10-W1388114025141701431514460
5/8"3/8" (.3750)1/4"-281-5/32"SC-10-W1388214026141711431614461

S3-12-W Cutters (3/4" Body, 3/8"-24 Thread)

Body Dia. Pilot Dia. Thread OAL Tool Name 78° EDP 82° EDP 90° EDP 100° EDP 120° EDP
3/4"5/32" (.1562)3/8"-241-3/16"S3-12-W1389514039141841432914474
3/4"#21 (.1590)3/8"-241-3/16"S3-12-W1389614040141851433014475
3/4"3/16" (.1875)3/8"-241-3/16"S3-12-W1389714041141861433114476
3/4"#10 (.1935)3/8"-241-3/16"S3-12-W1389814042141871433214477
3/4"7/32" (.2187)3/8"-241-3/16"S3-12-W1390014044141891433414479
3/4"1/4" (.2500)3/8"-241-3/16"S3-12-W1390114045141901433514480
3/4""F" (.2570)3/8"-241-3/16"S3-12-W1390214046141911433614481
3/4"5/16" (.3125)3/8"-241-3/16"S3-12-W1390314047141921433714482
3/4"3/8" (.3750)3/8"-241-3/16"S3-12-W1390414048141931433814483
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Precision Stop Countersink Units

Severance Precision Stop Countersink Units convert your drill press into a precision countersinking unit, giving you identical countersinks on parts of various thicknesses. Designed for hand power-tool and drill-press use. Units accept threaded SC- series cutters (sold separately).

Precision Stop Countersink Unit

Features:

  • Depth of cut adjusts without tools, in 0.001" increments; the SC-25P, SC-25PR, SC-35P and SC-35PR units give 0.0005" per click
  • Every unit has a positive stop lock nut and a SecurLock safety screw to hold the preset depth
  • The base sets the cutter perpendicular to the work; oversize or modified bases on special order
  • Non-marring nylon feet available to protect the work finish
  • Accepts threaded SC- series stop-countersink cutters
  • Light duty through long stroke super duty units. U.S. Patent 3028774
Unit Name Type Max Cutter Shank Dia. Outside Dia. OAL Retracted OAL Extended Internal Thread Stroke EDP
SC-14Light Duty7/16"1/4"7/8"3.243"3.544"1/4"-28.180"21220
SC-24Standard Duty3/4"1/4"1-1/16"3.265"3.513"1/4"-28.180"21221
SC-24RStandard Duty3/4"1/4"1-1/16"3.265"3.513"1/4"-28.180"21227
SC-25PStandard Duty3/4"1/4"1-1/16"3.265"3.513"1/4"-28.180"21322
SC-25PRStandard Duty3/4"1/4"1-1/16"3.265"3.513"1/4"-28.180"21323
SC-35PHeavy Duty3/4"3/8"1-1/16"3.310"3.521"3/8"-24.180"21324
SC-35PRHeavy Duty3/4"3/8"1-1/16"3.310"3.521"3/8"-24.180"21325
SC-36Heavy Duty3/4"3/8"1-1/16"3.310"3.521"3/8"-24.180"21222
SC-36RHeavy Duty3/4"3/8"1-1/16"3.310"3.521"3/8"-24.180"21228
SC-47Long Stroke Super Duty1-1/4"1/2"1-3/4"4.270"4.715"7/16"-20.280"21223
SC-57Long Stroke Heavy Duty1-1/4"3/8"1-3/4"4.700"5.185"3/8"-24.280"21224

Non-Marking Nylon Foot Accessories

For Unit Max Cutting Dia. With Foot Part Number EDP
SC-147/16"SC-14-1121245
SC-245/8"SC-24-1121264
SC-365/8"SC-36-1121264
SC-471-1/4"SC-47-1121302
SC-571-1/4"SC-57-1121302

#2 Morse Taper Adapter for SC-47 Unit

Part Number Description EDP
FM-4-MT#2 Morse Taper Adapter for SC-47 Unit34238

If the adapter is ordered at the same time as the SC-47 unit, the unit is supplied with a whistle notch.

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Adjustable Countersinks

Severance AC countersinks are made of high speed steel as an economical means of combining drilling and countersinking into a continuous operation. Each one fits a standard twist drill of the listed size (drill not included), so it need not be discarded if the drill breaks or is used up. It can be positioned at any point along the fluted section of the drill and works best set to start countersinking when the drilling is complete. For wood and light metals such as mild steel, magnesium, brass and die cast, and some plastics. Available in 82° and 90° included angles.

Aircraft Style Stop Countersink

Features:

  • Used with a standard twist drill of the listed size (drill not included)
  • 5 body sizes: 6-AC (3/8"), 8-AC (1/2"), 10-AC (5/8"), 14-AC (7/8"), 18-AC (1-1/8")
  • Available in 82° and 90° included angles
  • Teeth give a shearing cut for a chatter-free seat and avoid corkscrew jamming
  • Special diameters, drill sizes, flute configurations and angles available, including a version for aluminum and magnesium
Body Dia. Drill Size OAL Tool Name 82° EDP 90° EDP
6-AC Series (3/8" Body)
3/8"1/8" (.1250)1"6-AC-20357203622
3/8"#29 (.1360)1"6-AC-290357303623
3/8"#28 (.1405)1"6-AC-280357403624
3/8"#25 (.1495)1"6-AC-250357503625
3/8"#21 (.1590)1"6-AC-210357603626
3/8"#19 (.1660)1"6-AC-190357703627
8-AC Series (1/2" Body)
1/2"3/16" (.1875)1-1/8"8-AC-3/160357803628
1/2"#16 (.1770)1-1/8"8-AC-160357903629
1/2"#14 (.1820)1-1/8"8-AC-140358003630
1/2"7/32" (.2188)1-1/8"8-AC-7/320358103631
1/2"#10 (.1935)1-1/8"8-AC-100358203632
1/2"#7 (.2010)1-1/8"8-AC-70358303633
10-AC Series (5/8" Body)
5/8"7/32" (.2188)1-1/8"10-AC-7/320358403634
5/8"1/4" (.2500)1-1/8"10-AC-40358503635
5/8"#3 (.2130)1-1/8"10-AC-30358603636
5/8"#2 (.2210)1-1/8"10-AC-20358703637
5/8"9/32" (.2813)1-1/8"10-AC-9/320358803638
5/8"5/16" (.3125)1-1/8"10-AC-5/160358903639
5/8"D (.2460)1-1/8"10-AC-D0359003640
5/8"I (.2720)1-1/8"10-AC-I0359103641
5/8"F (.2570)1-1/8"10-AC-F0360303604
14-AC Series (7/8" Body)
7/8"Q (.3320)1-1/2"14-AC-Q0359203642
7/8"R (.3390)1-1/2"14-AC-R0359303643
7/8"S (.3480)1-1/2"14-AC-S0359403644
7/8"3/8" (.3750)1-1/2"14-AC-3/80359503645
7/8"U (.3680)1-1/2"14-AC-U0359603646
7/8"25/64" (.3906)1-1/2"14-AC-25/640359703647
18-AC Series (1-1/8" Body)
1-1/8"27/64" (.4219)1-3/4"18-AC-27/640359803648
1-1/8"7/16" (.4375)1-3/4"18-AC-7/160359903649
1-1/8"29/64" (.4531)1-3/4"18-AC-29/640360003650
1-1/8"1/2" (.5000)1-3/4"18-AC-1/20360103651
1-1/8"31/64" (.4844)1-3/4"18-AC-31/640360203652
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Technical Data & Speed/Feed Recommendations

Chatterless Countersinks perform best at moderate speeds with consistent feed rates. The 6-flute design allows for higher feed rates than conventional countersinks while maintaining a smooth finish.

HSS Countersinks

Material RPM (1/2" dia) Feed IPR
Aluminum 2000-3000 .003-.006"
Brass/Bronze 1500-2500 .002-.004"
Mild Steel 500-1000 .002-.003"
Stainless Steel 300-600 .001-.002"

Carbide Countersinks

Material RPM (1/2" dia) Feed IPR
Aluminum 4000-6000 .004-.008"
Brass/Bronze 3000-5000 .003-.005"
Mild Steel 1000-2000 .002-.004"
Stainless Steel 600-1200 .001-.003"
Why Chatterless?

Tools with symmetrical cutting edges tend to multiply the frequencies at which chatter occurs and to reinforce the vibration. The staggered cutting edges of the Chatterless design inhibit that harmonic vibration, so the seat stays smooth. A six-flute countersink also removes more material per revolution than a four-flute or single-flute tool and spreads the cutting load over more edges.

Related Products

CNC-K™ Countersinks

Precision countersinks designed specifically for CNC machining applications.

View CNC-K

3N1™ Countersinks

Combination drill-countersink-chamfer tools in one convenient package.

View 3N1
Regrind Service

Professional resharpening for your countersinks. Restore them to like-new condition.

Regrind Service Details

Guide: countersinking aluminum without chatter or smearing

Need a Custom Countersink Solution?

We manufacture custom angles, sizes, and configurations. Contact our engineering team for a quote.

Contact Us 989-777-5500
Detailed pages: 6-Flute HSS 6-Flute Carbide Double-Ended Threaded Shank Heavy Duty Econo-Sinks Single Flute 2N1 Countersinks Stop-Countersink HSS Stop-Countersink Carbide Micrometer Stops Adjustable Glenzer Sleeves 82° Countersinks 90° Countersinks 100° Countersinks
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