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COUNTERSUNK TYPE LOCKWASHERS

For use with flat and oval head screws having either 80° or 100° countersunk angles.
Where appearance or snagging are important considerations a version with a smooth external flange and internal teeth is available.

We also have Mil-Spec Countersunk Type Lockwashers.

SPECIFICATIONS: All commercial and military tooth lockwashers supplied by WCL Company and listed on these pages conform to ASME B18.21.1 and to all applicable specifications as reported by IFI.

82° COUNTERSUNK - EXTERNAL TYPE
Nominal	Inside		Outside		Nominal	WCL
Screw	Diameter		Diameter		Material	Product
Size	Min.	Max.	Min.	Max.	Thickness	Plain Steel
2	0.089	0.095	0.170	0.183	0.013	CTSK-0086-00-00
4	0.113	0.123	0.224	0.238	0.015	CTSK-0112-00-00
6	0.140	0.150	0.283	0.298	0.017	CTSK-0138-00-00
6	0.142	0.150	0.285	0.300	0.013	CTSK-0138-02-00
8	0.167	0.177	0.324	0.340	0.017	CTSK-0164-00-00
10	0.195	0.205	0.353	0.372	0.022	CTSK-0190-00-00
12	0.220	0.231	0.429	0.447	0.022	CTSK-0216-00-00
1/4	0.255	0.267	0.458	0.478	0.022	CTSK-0250-00-00
16	0.273	0.287	0.523	0.543	0.025	CTSK-0281-00-00
5/16	0.318	0.337	0.603	0.625	0.025	CTSK-0312-00-00
3/8	0.383	0.398	0.776	0.801	0.029	CTSK-0375-00-00
7/16	0.448	0.463	0.863	0.890	0.035	CTSK-0437-00-00
7/16	0.448	0.463	0.890	0.915	0.035	CTSK-0437-02-00
1/2	0.512	0.529	0.977	1.007	0.039	CTSK-0500-00-00
5/8	0.650	0.675	REF.	1.312	0.051	CTSK-0625-00-00

*100 COUNTERSUNK - EXTERNAL TYPE**
Nominal	Inside		Outside		Nominal	WCL
Screw	Diameter		Diameter		Material	Product
Size	Min.	Max.	Min.	Max.	Thickness	Plain Steel
4	0.116	0.123	0.265	0.280	0.015	CTSK-0112-01-00
6	0.142	0.150	0.271	0.287	0.013	CTSK-0138-01-00
8	0.168	0.176	0.324	0.340	0.015	CTSK-0164-04-00
10	0.195	0.204	0.377	0.394	0.017	CTSK-0190-05-00
1/4	0.256	0.267	0.473	0.493	0.022	CTSK-0250-05-00
5/16	0.318	0.333	0.631	0.653	0.025	CTSK-0312-05-01
7/16	0.448	0.463	0.890	0.915	0.035	CTSK-0437-02-00

*82 COUNTERSUNK - INTERNAL FLANGE TYPE**
Nominal	Inside		Outside		Nominal	WCL
Screw	Diameter		Diameter		Material	Product
Size	Min.	Max.	Min.	Max.	Thickness	Plain Steel
8	0.207	0.215	0.615	0.635	0.025	CTSK-0164-07-00
5/16	0.340	0.362	0.802	0.818	0.029	CTSK-0312-04-00

	Screw Size	4	5	6	8	10	12	1/4	5/16	3/8
	A	1/8	5/32	11/64	13/64	15/64	1/4	9/32	23/64	27/64
	B	9/32	5/16	11/32	25/64	29/64	33/64	37/64	45/64	27/32
	C	.090	.095	.100	.110	.125	.155	.165	.200	.245
	Note: Dimensions are approximate.
	Countersinking specifications to accommodate 82� flat and oval head screws with WCL Countersunk Lockwashers

WCL Company • 16730 East Johnson Dr. • P.O. Box 3588 • Industry, CA 91744
Tel (626) 968-5523 • Fax (626) 369-9805 • We are Open 7am - 4:30pm, Pacific

WCL Company specializes in reliable low-cost, engineered high-performance fasteners, fittings, plastic components, washers, nuts, and a wide array of fastener components. WCL has 50 years of experience with all types of standard and engineered fasteners, and provides a comprehensive line of fastener products for sale from some of the world's leading manufacturers.

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