Chatterless Countersinks™ & Chamfering Tools

The Chatter-Free Difference

Traditional single-flute countersinks create harmonics that cause chatter marks. Our 6-flute design eliminates this problem.

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.

Traditional Countersinks

Single flute creates harmonics
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)

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. Standard 82° included angle.

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

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
1/8"	1/8"	1-5/8"	CK-1/8	02370	02390	02410	02430	02450	02470
3/16"	3/16"	1-1/2"	CK-3/16	02371	02391	02411	02431	02451	02471
1/4"	3/16"	1-1/2"	CK-1/4	02372	02392	02412	02432	02452	02472
5/16"	1/4"	1-3/4"	CK-5/16	02373	02393	02413	02433	02453	02473
3/8"	1/4"	1-3/4"	CK-3/8	02374	02394	02414	02434	02454	02474
1/2"	3/8"	2-1/8"	CK-1/2	02375	02395	02415	02435	02455	02475
1/2"	1/4"	2-1/8"	CK-1/2-1/4	02376	02396	02416	02436	02456	02476
5/8"	3/8"	2-3/8"	CK-5/8	02377	02397	02417	02437	02457	02477
5/8"	1/4"	2-3/8"	CK-5/8-1/4	02378	02398	02418	02438	02458	02478
3/4"	1/2"	2-11/16"	CK-3/4	02379	02399	02419	02439	02459	02479
7/8"	1/2"	2-13/16"	CK-7/8	02380	02400	02420	02440	02460	02480
1"	1/2"	2-13/16"	CK-1	02381	02401	02421	02441	02461	02481
1-1/4"	3/4"	3-3/8"	CK-1-1/4	02382	02402	02422	02442	02462	02482
1-1/2"	3/4"	3-1/2"	CK-1-1/2	02383	02403	02423	02443	02463	02483
1-3/4"	1"	4-1/4"	CK-1-3/4	02384	02404	02424	02444	02464	02484
2"	1"	4-3/8"	CK-2	02385	02405	02425	02445	02465	02485
2-1/2"	1"	4-3/4"	CK-2-1/2	02386	02406	02426	02446	02466	02486
3"	1"	5"	CK-3	02387	02407	02427	02447	02467	02487

6-Flute Carbide Chatterless Countersinks

Solid carbide construction for maximum tool life in abrasive materials and high-volume production. 10-20x longer life than HSS in most applications.

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

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
1/8"	1/8"	1-1/2"	CK-1/8-W	02520	02540	02560	02580	02600	02620
3/16"	3/16"	1-1/2"	CK-3/16-W	02521	02541	02561	02581	02601	02621
1/4"	3/16"	1-1/2"	CK-1/4-W	02522	02542	02562	02582	02602	02622
5/16"	1/4"	2-1/4"	CK-5/16-W	02523	02543	02563	02583	02603	02623
3/8"	1/4"	2-1/4"	CK-3/8-W	02524	02544	02564	02584	02604	02624
1/2"	3/8"	2-1/2"	CK-1/2-W	02525	02545	02565	02585	02605	02625
1/2"	1/4"	2-1/4"	CK-1/2-W-1/4	02526	02546	02566	02586	02606	02626
5/8"	3/8"	2-5/8"	CK-5/8-W	02527	02547	02567	02587	02607	02627
5/8"	1/4"	2-3/8"	CK-5/8-W-1/4	02528	02548	02568	02588	02608	02628
3/4"	1/2"	2-3/4"	CK-3/4-W	02529	02549	02569	02589	02609	02629
7/8"	1/2"	2-7/8"	CK-7/8-W	02530	02550	02570	02590	02610	02630
1"	1/2"	3"	CK-1-W	02531	02551	02571	02591	02611	02631
1-1/4"	3/4"	3-3/8"	CK-1-1/4-W	02532	02552	02572	02592	02612	02632
1-1/2"	3/4"	3-1/2"	CK-1-1/2-W	02533	02553	02573	02593	02613	02633
1-3/4"	1"	4-1/4"	CK-1-3/4-W	02534	02554	02574	02594	02614	02634
2"	1"	4-3/8"	CK-2-W	02535	02555	02575	02595	02615	02635

Double-Ended Countersinks

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-DE	02670	02685	02700	02715	02730	02745
3/16"	1-7/8"	CK-3/16-DE	02671	02686	02701	02716	02731	02746
1/4"	2"	CK-1/4-DE	02672	02687	02702	02717	02732	02747
5/16"	2-1/8"	CK-5/16-DE	02673	02688	02703	02718	02733	02748
3/8"	2-1/2"	CK-3/8-DE	02674	02689	02704	02719	02734	02749
1/2"	3"	CK-1/2-DE	02675	02690	02705	02720	02735	02750
5/8"	3-1/4"	CK-5/8-DE	02676	02691	02706	02721	02736	02751
3/4"	3-1/2"	CK-3/4-DE	02677	02692	02707	02722	02737	02752

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-DE	02820	02835	02850	02865	02880	02895
3/16"	2"	CK-3/16-W-DE	02821	02836	02851	02866	02881	02896
1/4"	2"	CK-1/4-W-DE	02822	02837	02852	02867	02882	02897
5/16"	2-1/8"	CK-5/16-W-DE	02823	02838	02853	02868	02883	02898
3/8"	2-1/2"	CK-3/8-W-DE	02824	02839	02854	02869	02884	02899
1/2"	3"	CK-1/2-W-DE	02825	02840	02855	02870	02885	02900
5/8"	3-1/4"	CK-5/8-W-DE	02826	02841	02856	02871	02886	02901
3/4"	3-1/2"	CK-3/4-W-DE	02827	02842	02857	02872	02887	02902

Threaded Shank Countersinks

Threaded shank design for use with countersink holders and quick-change systems. Secure clamping prevents slippage.

Body Dia.	Thread	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
3/4"	3/8"-24	1-1/2"	CK-3/4-T	03270	03280	03290	03300	03310	03320
7/8"	3/8"-24	1-1/2"	CK-7/8-T	03271	03281	03291	03301	03311	03321
1"	1/2"-20	1-1/2"	CK-1-T	03272	03282	03292	03302	03312	03322
1-1/4"	5/8"-18	1-3/4"	CK-1-1/4-T	03273	03283	03293	03303	03313	03323
1-1/2"	3/4"-16	1-7/8"	CK-1-1/2-T	03274	03284	03294	03304	03314	03324
1-3/4"	3/4"-16	2-1/8"	CK-1-3/4-T	03275	03285	03295	03305	03315	03325
2"	3/4"-16	2-1/4"	CK-2-T	03276	03286	03296	03306	03316	03326
2-1/2"	1"-14	3"	CK-2-1/2-T	03277	03287	03297	03307	03317	03327
3"	1-1/4"-12	3-1/4"	CK-3-T	03278	03288	03298	03308	03318	03328

Heavy Duty Countersinks

Extra-robust construction for demanding applications. Larger shank diameters and increased flute depth for aggressive material removal.

Available in N (normal) and F (fine) tooth configurations. Available in 60°, 82°, and 90° included angles. Designed for use with Glenzer sleeve adapters.

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP
3/8"	13/32"	2-13/16"	HD-3/8-N	03920	03940	03960
3/8"	13/32"	2-13/16"	HD-3/8-F	03921	03941	03961
1/2"	13/32"	3-1/16"	HD-1/2-N	03922	03942	03962
1/2"	13/32"	3-1/16"	HD-1/2-F	03923	03943	03963
3/4"	3/4"	3-7/8"	HD-3/4-N	03924	03944	03964
3/4"	3/4"	3-7/8"	HD-3/4-F	03925	03945	03965
1"	3/4"	4-5/16"	HD-1-N	03926	03946	03966
1"	3/4"	4-5/16"	HD-1-F	03927	03947	03967
1-1/4"	1"	5"	HD-1-1/4-N	03928	03948	03968
1-1/4"	1"	5"	HD-1-1/4-F	03929	03949	03969
1-1/2"	1"	5-1/4"	HD-1-1/2-N	03930	03950	03970
1-1/2"	1"	5-1/4"	HD-1-1/2-F	03931	03951	03971
2"	1"	5-3/4"	HD-2-N	03932	03952	03972
2"	1"	5-3/4"	HD-2-F	03933	03953	03973

Glenzer Sleeve Adapters

Sleeve adapters for use with Heavy Duty Countersinks. Allow mounting of HD-series countersinks in standard drill chucks and tool holders.

Description	EDP
Glenzer Sleeve Adapter - Small	36210
Glenzer Sleeve Adapter - Medium	36211
Glenzer Sleeve Adapter - Large	36212

4-Flute Chatter-Free® Econo-Sinks®

An economical alternative to our 6-flute countersinks, the 4-Flute Econo-Sinks provide excellent chatter-free performance at a lower cost. Ideal for general-purpose countersinking applications.

Features:

4-flute chatter-free design
Economical pricing for high-volume applications
Available in HSS and Carbide
All 6 standard included angles available
Sizes from 1/8" to 3" diameter

HSS Econo-Sinks

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

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
1/8"	1/8"	1-5/8"	ES-1/8	00970	00991	01012	01033	01054	01075
3/16"	3/16"	1-1/2"	ES-3/16	00971	00992	01013	01034	01055	01076
1/4"	3/16"	1-1/2"	ES-1/4	00972	00993	01014	01035	01056	01077
5/16"	1/4"	1-3/4"	ES-5/16	00973	00994	01015	01036	01057	01078
3/8"	1/4"	1-3/4"	ES-3/8	00974	00995	01016	01037	01058	01079
1/2"	3/8"	2-1/8"	ES-1/2	00976	00997	01018	01039	01060	01081
1/2"	1/4"	2-1/8"	ES-1/2-1/4	00977	00998	01019	01040	01061	01082
5/8"	3/8"	2-3/8"	ES-5/8	00978	00999	01020	01041	01062	01083
5/8"	1/4"	2-3/8"	ES-5/8-1/4	00979	01000	01021	01042	01063	01084
3/4"	1/2"	2-11/16"	ES-3/4	00980	01001	01022	01043	01064	01085
7/8"	1/2"	2-13/16"	ES-7/8	00982	01003	01024	01045	01066	01087
1"	1/2"	2-13/16"	ES-1	00983	01004	01025	01046	01067	01088
1-1/4"	3/4"	3-3/8"	ES-1-1/4	00984	01005	01026	01047	01068	01089
1-1/2"	3/4"	3-1/2"	ES-1-1/2	00985	01006	01027	01048	01069	01090
1-3/4"	1"	4-1/4"	ES-1-3/4	00987	01008	01029	01050	01071	01092
2"	1"	4-3/8"	ES-2	00988	01009	01030	01051	01072	01093
2-1/2"	1"	4-3/4"	ES-2-1/2	00989	01010	01031	01052	01073	01094
3"	1"	5"	ES-3	00990	01011	01032	01053	01074	01095

Carbide Econo-Sinks

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
1/8"	1/8"	1-1/2"	ES-1/8-W	01120	01135	01150	01165	01180	01195
1/4"	3/16"	1-1/2"	ES-1/4-W	01121	01136	01151	01166	01181	01196
3/8"	1/4"	2-1/4"	ES-3/8-W	01122	01137	01152	01167	01182	01197
1/2"	3/8"	2-1/4"	ES-1/2-W	01125	01140	01155	01170	01185	01200
5/8"	3/8"	2-5/8"	ES-5/8-W	01126	01141	01156	01171	01186	01201
3/4"	1/2"	2-3/4"	ES-3/4-W	01127	01142	01157	01172	01187	01202
1"	1/2"	3"	ES-1-W	01128	01143	01158	01173	01188	01203

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-DE	01204	01212	01220	01228	01236	01244
3/16"	1-7/8"	ES-3/16-DE	01205	01213	01221	01229	01237	01245
1/4"	2"	ES-1/4-DE	01206	01214	01222	01230	01238	01246
5/16"	2-1/8"	ES-5/16-DE	01207	01215	01223	01231	01239	01247
3/8"	2-1/2"	ES-3/8-DE	01208	01216	01224	01232	01240	01248
1/2"	3"	ES-1/2-DE	01209	01217	01225	01233	01241	01249
5/8"	3-1/4"	ES-5/8-DE	01210	01218	01226	01234	01242	01250
3/4"	3-1/2"	ES-3/4-DE	01211	01219	01227	01235	01243	01251

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-DE	01252	01260	01268	01276	01284	01292
3/16"	2"	ES-3/16-W-DE	01253	01261	01269	01277	01285	01293
1/4"	2"	ES-1/4-W-DE	01254	01262	01270	01278	01286	01294
5/16"	2-1/8"	ES-5/16-W-DE	01255	01263	01271	01279	01287	01295
3/8"	2-1/2"	ES-3/8-W-DE	01256	01264	01272	01280	01288	01296
1/2"	3"	ES-1/2-W-DE	01257	01265	01273	01281	01289	01297
5/8"	3-1/4"	ES-5/8-W-DE	01258	01266	01274	01282	01290	01298
3/4"	3-1/2"	ES-3/4-W-DE	01259	01267	01275	01283	01291	01299

Single Flute Countersinks

Economical option for light-duty applications. Single flute design with pilot for accurate hole centering. Available in HSS and Carbide, single-ended and double-ended configurations.

HSS Single Flute

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

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
1/8"	1/8"	1-5/8"	1/8-SF	00270	00288	00306	00324	00342	00360
3/16"	3/16"	1-1/2"	3/16-SF	00271	00289	00307	00325	00343	00361
1/4"	3/16"	1-1/2"	1/4-SF	00272	00290	00308	00326	00344	00362
5/16"	1/4"	1-3/4"	5/16-SF	00273	00291	00309	00327	00345	00363
3/8"	1/4"	1-3/4"	3/8-SF	00274	00292	00310	00328	00346	00364
1/2"	3/8"	2-1/8"	1/2-SF	00275	00293	00311	00329	00347	00365
1/2"	1/4"	2-1/8"	1/2-SF-1/4	00276	00294	00312	00330	00348	00366
5/8"	3/8"	2-3/8"	5/8-SF	00277	00295	00313	00331	00349	00367
5/8"	1/4"	2-3/8"	5/8-SF-1/4	00278	00296	00314	00332	00350	00368
3/4"	1/2"	2-11/16"	3/4-SF	00279	00297	00315	00333	00351	00369
7/8"	1/2"	2-13/16"	7/8-SF	00280	00298	00316	00334	00352	00370
1"	1/2"	2-13/16"	1-SF	00281	00299	00317	00335	00353	00371
1-1/4"	3/4"	3-3/8"	1-1/4-SF	00282	00300	00318	00336	00354	00372
1-1/2"	3/4"	3-1/2"	1-1/2-SF	00283	00301	00319	00337	00355	00373
1-3/4"	1"	4-1/4"	1-3/4-SF	00284	00302	00320	00338	00356	00374
2"	1"	4-3/8"	2-SF	00285	00303	00321	00339	00357	00375
2-1/2"	1"	4-3/4"	2-1/2-SF	00286	00304	00322	00340	00358	00376
3"	1"	5"	3-SF	00287	00305	00323	00341	00359	00377

Carbide Single Flute

Body Dia.	Shank Dia.	OAL	Tool Name	60° EDP	82° EDP	90° EDP	100° EDP	110° EDP	120° EDP
1/8"	1/8"	1-1/2"	1/8-SF-W	00420	00440	00460	00480	00500	00520
3/16"	3/16"	1-1/2"	3/16-SF-W	00421	00441	00461	00481	00501	00521
1/4"	3/16"	1-1/2"	1/4-SF-W	00422	00442	00462	00482	00502	00522
5/16"	1/4"	2-1/4"	5/16-SF-W	00423	00443	00463	00483	00503	00523
3/8"	1/4"	2-1/4"	3/8-SF-W	00424	00444	00464	00484	00504	00524
1/2"	3/8"	2-1/2"	1/2-SF-W	00425	00445	00465	00485	00505	00525
1/2"	1/4"	2-1/4"	1/2-SF-W-1/4	00426	00446	00466	00486	00506	00526
5/8"	3/8"	2-5/8"	5/8-SF-W	00427	00447	00467	00487	00507	00527
5/8"	1/4"	2-3/8"	5/8-SF-W-1/4	00428	00448	00468	00488	00508	00528
3/4"	1/2"	2-3/4"	3/4-SF-W	00429	00449	00469	00489	00509	00529
7/8"	1/2"	2-7/8"	7/8-SF-W	00430	00450	00470	00490	00510	00530
1"	1/2"	3"	1-SF-W	00431	00451	00471	00491	00511	00531
1-1/4"	3/4"	3-3/8"	1-1/4-SF-W	00432	00452	00472	00492	00512	00532
1-1/2"	3/4"	3-1/2"	1-1/2-SF-W	00433	00453	00473	00493	00513	00533
1-3/4"	1"	4-1/4"	1-3/4-SF-W	00434	00454	00474	00494	00514	00534
2"	1"	4-3/8"	2-SF-W	00435	00455	00475	00495	00515	00535

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-DE	00536	00544	00552	00560	00568	00576
3/16"	1-7/8"	3/16-SF-DE	00537	00545	00553	00561	00569	00577
1/4"	2"	1/4-SF-DE	00538	00546	00554	00562	00570	00578
5/16"	2-1/8"	5/16-SF-DE	00539	00547	00555	00563	00571	00579
3/8"	2-1/2"	3/8-SF-DE	00540	00548	00556	00564	00572	00580
1/2"	3"	1/2-SF-DE	00541	00549	00557	00565	00573	00581
5/8"	3-1/4"	5/8-SF-DE	00542	00550	00558	00566	00574	00582
3/4"	3-1/2"	3/4-SF-DE	00543	00551	00559	00567	00575	00583

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-DE	00600	00609	00617	00625	00633	00641
3/16"	2"	3/16-SF-W-DE	00601	00610	00618	00626	00634	00642
1/4"	2"	1/4-SF-W-DE	00602	00611	00619	00627	00635	00643
5/16"	2-1/8"	5/16-SF-W-DE	00603	00612	00620	00628	00636	00644
3/8"	2-1/2"	3/8-SF-W-DE	00604	00613	00621	00629	00637	00645
1/2"	3"	1/2-SF-W-DE	00605	00614	00622	00630	00638	00646
5/8"	3-1/4"	5/8-SF-W-DE	00606	00615	00623	00631	00639	00647
3/4"	3-1/2"	3/4-SF-W-DE	00607	00616	00624	00632	00640	00648

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-DE	02922	02932	02942
3/8"	2-1/2"	2N1-3/8-DE	02924	02934	02944
1/2"	3"	2N1-1/2-DE	02925	02935	02945

Additional sizes and angles available soon. Contact us for details.

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. All cutters have 1/4"-28 threads.

Features:

Threaded shank (1/4"-28) for use with SC- stop units
Chatter-free cutting action
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)

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/32" (.0938)	15340	15485	15629	15774	15919
#40 (.0980)	15341	15486	15630	15775	15920
1/8" (.1250)	15342	15487	15631	15776	15921
#30 (.1285)	15343	15488	15632	15777	15922
5/32" (.1562)	15345	15489	15634	15779	15924
#21 (.1590)	15346	15490	15635	15780	15925
3/16" (.1875)	15347	15491	15636	15781	15926
#10 (.1935)	15348	15492	15637	15782	15927

SC-7 Cutters (7/16" Body)

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/32" (.0938)	15350	15494	15639	15784	15929
#40 (.0980)	15351	15495	15640	15785	15930
1/8" (.1250)	15352	15496	15641	15786	15931
#30 (.1285)	15353	15497	15642	15787	15932
5/32" (.1562)	15355	15499	15644	15789	15934
#21 (.1590)	15356	15500	15645	15790	15935
3/16" (.1875)	15357	15501	15646	15791	15936
#10 (.1935)	15358	15502	15647	15792	15937

SC-8 Cutters (1/2" Body)

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/32" (.0938)	15360	15504	15649	15794	15939
#40 (.0980)	15361	15505	15650	15795	15940
1/8" (.1250)	15362	15506	15651	15796	15941
#30 (.1285)	15363	15507	15652	15797	15942
5/32" (.1562)	15364	15508	15653	15798	15943
#21 (.1590)	15366	15510	15655	15800	15945
3/16" (.1875)	15367	15511	15656	15801	15946
#10 (.1935)	15368	15512	15657	15802	15947
7/32" (.2187)	15369	15513	15658	15803	15948
1/4" (.2500)	15370	15514	15659	15804	15949

SC-10 Cutters (5/8" Body)

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
1/8" (.1250)	15372	15516	15661	15806	15951
#30 (.1285)	15373	15517	15662	15807	15952
5/32" (.1562)	15374	15518	15663	15808	15953
#21 (.1590)	15375	15519	15664	15809	15954
3/16" (.1875)	15376	15520	15665	15810	15955
#10 (.1935)	15378	15522	15667	15812	15957
7/32" (.2187)	15379	15523	15668	15813	15958
1/4" (.2500)	15380	15524	15669	15814	15959
5/16" (.3125)	15381	15525	15670	15815	15960
3/8" (.3750)	15382	15526	15671	15816	15961

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
5/32" (.1562)	15384	15528	15673	15818	15963
#21 (.1590)	15385	15529	15674	15819	15964
3/16" (.1875)	15386	15530	15675	15820	15965
#10 (.1935)	15387	15531	15676	15821	15966
7/32" (.2187)	15389	15533	15678	15823	15968
1/4" (.2500)	15390	15534	15679	15824	15969
"F" (.2570)	15391	15535	15680	15825	15970
5/16" (.3125)	15392	15536	15681	15826	15971
3/8" (.3750)	15393	15537	15682	15827	15972

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
5/32" (.1562)	15395	15539	15684	15829	15974
#21 (.1590)	15396	15540	15685	15830	15975
3/16" (.1875)	15397	15541	15686	15831	15976
#10 (.1935)	15398	15542	15687	15832	15977
7/32" (.2187)	15400	15544	15689	15834	15979
1/4" (.2500)	15401	15545	15690	15835	15980
"F" (.2570)	15402	15546	15691	15836	15981
5/16" (.3125)	15403	15547	15692	15837	15982
3/8" (.3750)	15404	15548	15693	15838	15983

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/16" (.1875)	15406	15550	15695	15840	15985
#10 (.1935)	15407	15551	15696	15841	15986
7/32" (.2187)	15408	15552	15697	15842	15987
1/4" (.2500)	15409	15553	15698	15843	15988
"F" (.2570)	15411	15555	15700	15845	15990
5/16" (.3125)	15412	15556	15701	15846	15991
3/8" (.3750)	15413	15557	15702	15847	15992
1/2" (.5000)	15414	15558	15703	15848	15993

Carbide Stop-Countersink Cutters

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)

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/32" (.0938)	13840	13985	14129	14274	14419
#40 (.0980)	13841	13986	14130	14275	14420
1/8" (.1250)	13842	13987	14131	14276	14421
#30 (.1285)	13843	13988	14132	14277	14422
5/32" (.1562)	13845	13989	14134	14279	14424
#21 (.1590)	13846	13990	14135	14280	14425
3/16" (.1875)	13847	13991	14136	14281	14426
#10 (.1935)	13848	13992	14137	14282	14427

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/32" (.0938)	13850	13994	14139	14284	14429
#40 (.0980)	13851	13995	14140	14285	14430
1/8" (.1250)	13852	13996	14141	14286	14431
#30 (.1285)	13853	13997	14142	14287	14432
5/32" (.1562)	13855	13999	14144	14289	14434
#21 (.1590)	13856	14000	14145	14290	14435
3/16" (.1875)	13857	14001	14146	14291	14436
#10 (.1935)	13858	14002	14147	14292	14437

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
3/32" (.0938)	13860	14004	14149	14294	14439
#40 (.0980)	13861	14005	14150	14295	14440
1/8" (.1250)	13862	14006	14151	14296	14441
#30 (.1285)	13863	14007	14152	14297	14442
5/32" (.1562)	13864	14008	14153	14298	14443
#21 (.1590)	13866	14010	14155	14300	14445
3/16" (.1875)	13867	14011	14156	14301	14446
#10 (.1935)	13868	14012	14157	14302	14447
7/32" (.2187)	13869	14013	14158	14303	14448
1/4" (.2500)	13870	14014	14159	14304	14449

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
1/8" (.1250)	13872	14016	14161	14306	14451
#30 (.1285)	13873	14017	14162	14307	14452
5/32" (.1562)	13874	14018	14163	14308	14453
#21 (.1590)	13875	14019	14164	14309	14454
3/16" (.1875)	13876	14020	14165	14310	14455
#10 (.1935)	13878	14022	14167	14312	14457
7/32" (.2187)	13879	14023	14168	14313	14458
1/4" (.2500)	13880	14024	14169	14314	14459
5/16" (.3125)	13881	14025	14170	14315	14460
3/8" (.3750)	13882	14026	14171	14316	14461

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

Pilot Dia.	78° EDP	82° EDP	90° EDP	100° EDP	120° EDP
5/32" (.1562)	13895	14039	14184	14329	14474
#21 (.1590)	13896	14040	14185	14330	14475
3/16" (.1875)	13897	14041	14186	14331	14476
#10 (.1935)	13898	14042	14187	14332	14477
7/32" (.2187)	13900	14044	14189	14334	14479
1/4" (.2500)	13901	14045	14190	14335	14480
"F" (.2570)	13902	14046	14191	14336	14481
5/16" (.3125)	13903	14047	14192	14337	14482
3/8" (.3750)	13904	14048	14193	14338	14483

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).

Features:

Precision depth control for consistent countersinks
Spring-loaded for consistent pressure
Accepts threaded SC- series stop-countersink cutters
Available in light duty through super duty configurations
"R" suffix models feature reverse rotation capability
"P" suffix models feature positive stop

Unit Name	Type	Max Cutter	Shank Dia.	Outside Dia.	Internal Thread	Stroke	EDP
SC-14	Light Duty	7/16"	1/4"	7/8"	1/4"-28	.180"	21220
SC-24	Standard Duty	3/4"	1/4"	1-1/16"	1/4"-28	.180"	21221
SC-24R	Standard Duty (Reverse)	3/4"	1/4"	1-1/16"	1/4"-28	.180"	21227
SC-25P	Standard Duty (Positive)	3/4"	1/4"	1-1/16"	1/4"-28	.180"	21322
SC-25PR	Standard Duty (Pos/Rev)	3/4"	1/4"	1-1/16"	1/4"-28	.180"	21323
SC-35P	Heavy Duty (Positive)	3/4"	3/8"	1-1/16"	3/8"-24	.180"	21324
SC-35PR	Heavy Duty (Pos/Rev)	3/4"	3/8"	1-1/16"	3/8"-24	.180"	21325
SC-36	Heavy Duty	3/4"	3/8"	1-1/16"	3/8"-24	.180"	21222
SC-36R	Heavy Duty (Reverse)	3/4"	3/8"	1-1/16"	3/8"-24	.180"	21228
SC-47	Long Stroke Super Duty	1-1/4"	1/2"	1-3/4"	7/16"-20	.280"	21223
SC-57	Long Stroke Heavy Duty	1-1/4"	3/8"	1-3/4"	3/8"-24	.280"	21224

Non-Marking Nylon Foot Accessories

For Unit	Max Cutting Dia. With Foot	Part Number	EDP
SC-14	7/16"	SC-14-11	21245
SC-24	5/8"	SC-24-11	21264
SC-36	5/8"	SC-36-11	21264
SC-47	1-1/4"	SC-47-11	21302
SC-57	1-1/4"	SC-57-11	21302

Adjustable Countersinks

Combination drill and countersink tools with specific built-in drill sizes for aircraft fastener applications. Each tool is sized for a specific drill diameter. Available in 82° and 90° included angles.

Features:

Specific drill size built into each tool
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
Designed for aircraft and aerospace fastener applications

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-2	03572	03622
3/8"	#29 (.1360)	1"	6-AC-29	03573	03623
3/8"	#28 (.1405)	1"	6-AC-28	03574	03624
3/8"	#25 (.1495)	1"	6-AC-25	03575	03625
3/8"	#21 (.1590)	1"	6-AC-21	03576	03626
3/8"	#19 (.1660)	1"	6-AC-19	03577	03627
8-AC Series (1/2" Body)
1/2"	3/16" (.1875)	1-1/8"	8-AC-3/16	03578	03628
1/2"	#16 (.1770)	1-1/8"	8-AC-16	03579	03629
1/2"	#14 (.1820)	1-1/8"	8-AC-14	03580	03630
1/2"	7/32" (.2188)	1-1/8"	8-AC-7/32	03581	03631
1/2"	#10 (.1935)	1-1/8"	8-AC-10	03582	03632
1/2"	#7 (.2010)	1-1/8"	8-AC-7	03583	03633
10-AC Series (5/8" Body)
5/8"	7/32" (.2188)	1-1/8"	10-AC-7/32	03584	03634
5/8"	1/4" (.2500)	1-1/8"	10-AC-4	03585	03635
5/8"	#3 (.2130)	1-1/8"	10-AC-3	03586	03636
5/8"	#2 (.2210)	1-1/8"	10-AC-2	03587	03637
5/8"	9/32" (.2813)	1-1/8"	10-AC-9/32	03588	03638
5/8"	5/16" (.3125)	1-1/8"	10-AC-5/16	03589	03639
5/8"	D (.2460)	1-1/8"	10-AC-D	03590	03640
5/8"	I (.2720)	1-1/8"	10-AC-I	03591	03641
5/8"	F (.2570)	1-1/8"	10-AC-F	03603	03604
14-AC Series (7/8" Body)
7/8"	Q (.3320)	1-1/2"	14-AC-Q	03592	03642
7/8"	R (.3390)	1-1/2"	14-AC-R	03593	03643
7/8"	S (.3480)	1-1/2"	14-AC-S	03594	03644
7/8"	3/8" (.3750)	1-1/2"	14-AC-3/8	03595	03645
7/8"	U (.3680)	1-1/2"	14-AC-U	03596	03646
7/8"	25/64" (.3906)	1-1/2"	14-AC-25/64	03597	03647
18-AC Series (1-1/8" Body)
1-1/8"	27/64" (.4219)	1-3/4"	18-AC-27/64	03598	03648
1-1/8"	7/16" (.4375)	1-3/4"	18-AC-7/16	03599	03649
1-1/8"	29/64" (.4531)	1-3/4"	18-AC-29/64	03600	03650
1-1/8"	1/2" (.5000)	1-3/4"	18-AC-1/2	03601	03651
1-1/8"	31/64" (.4844)	1-3/4"	18-AC-31/64	03602	03652

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?

Traditional 4-flute countersinks create harmonic vibrations that cause chatter marks on the countersink surface. The 6-flute Chatterless design interrupts these harmonics, producing smooth, professional finishes even at higher feed rates. This allows for faster cycle times without sacrificing quality.

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Regrind Service

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

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Need a Custom Countersink Solution?

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

Contact Us 989-777-5500