WCL Fasteners: Double Coil Helical Spring Lock Washers | Extra Heavy | Hi-Collar | Metric Helical Spring Lock Washers

INTERNAL TYPE LOCKWASHERS (Mil-Spec)

Work best with smaller screw heads (such as fillister heads).

Use where appearance warrants that teeth be hidden.

Use where snagging or scratching could be a problem.

Internal teeth lock into bolt head or nut to prevent backoff rotation.

MATERIALS: Part numbers shown are for washers made of spring steel, bronze alloy and in 400 series stainless steel. They are in stock at WCL. We also produce this type of external tooth lockwashers in 300 series stainless steel as well as other materials upon request. Specify material when inquiring or ordering by referencing the corresponding dash number of the size part desired.

SPECIFICATIONS: All commercial, AN, MS and NAS lockwashers supplied by WCL Company and listed on these pages, conform to ASME B18.21.1 or applicable specifications as reported by IFI and other reporting agencies. Manufacturers in countries outside the United States including, Mexico, Canada, China, Taiwan, India, UK, Spain, and Russia, mfg. parts from tooling owned in part or wholly by WCL Company. Materials and plating comply with applicable specifications and supporting documentation is available with orders. Parts plated with commercial Zinc plating can be supplied with Hexavalent free chromates. Certification of RoHS compliance is available upon request. DFARS 252.225-7014 Alt. 1 compliance certifications, if applicable may be available. Please check with your sales person at the time of quotation.

Nominal	Inside		Outside		Material		MS35333
Screw	Diameter		Diameter		Thickness		Steel	410 Stainless	300 Stainless	Alloy
Size	Min.	Max.	Min.	Max.	Min.	Max.	Plated	Steel	Steel	Bronze
2	0.089	0.095	0.175	0.200	0.010	0.015	-35	-69	---	-103
4	0.115	0.123	0.255	0.270	0.015	0.019	-36	-70	-153	-104
6	0.141	0.150	0.275	0.295	0.017	0.021	-37	-71	-154	-105
8	0.168	0.176	0.325	0.340	0.018	0.023	-38	-72	-155	-106
10	0.195	0.204	0.365	0.381	0.020	0.025	-39	-73	---	-107
1/4	0.256	0.267	0.460	0.478	0.023	0.028	-40	-74	---	-108
1/4	0.256	0.267	0.395	0.410	0.016	0.020	-125	-135	-167	-145
5/16	0.320	0.332	0.594	0.610	0.028	0.034	-41	-75	---	-109
3/8	0.384	0.398	0.670	0.692	0.032	0.040	-42	-76	---	-110
3/8	0.383	0.392	0.493	0.507	0.020	0.030	---	-134	---	---
7/16	0.448	0.464	0.740	0.789	0.032	0.040	-43	-77	---	-111
7/16	0.440	0.448	0.580	0.592	0.016	0.020	-131	-141	---	-151
15/32	0.472	0.480	0.593	0.607	0.016	0.020	-121*	---	---	-112*
15/32	0.472	0.480	0.593	0.607	0.013	0.023	-126	-136	---	-146
1/2	0.512	0.530	0.867	0.900	0.037	0.045	-44	-78	---	-113
9/16	0.576	0.596	0.957	0.985	0.037	0.045	-45	-79	---	-114
9/16	0.570	0.580	0.680	0.690	0.013	0.023	-127	-137	---	-147
5/8	0.640	0.663	1.045	1.071	0.042	0.050	-46	-80	---	-115
5/8	0.630	0.640	0.790	0.800	0.017	0.027	-128	-138	---	-148
3/4	0.769	0.795	1.220	1.245	0.047	0.055	-47	-81	---	-116
3/4	0.775	0.785	1.047	1.077	0.017	0.027	-129	-139	---	-149
7/8	0.894	0.927	1.364	1.410	0.052	0.060	-48	-82	---	-117
1	1.019	1.060	1.550	1.637	0.059	0.067	-49	-83	---	-118
1	1.010	1.020	1.360	1.390	0.023	0.028	-130	-140	---	-150
1 1/4	1.275	1.325	1.921	1.975	0.059	0.067	-51	-85	---	-120
* Dash numbers 112 and 121 only, have alternate twisted teeth.