There is a minimum order of $250.00
(samples may require a $25.00 processing fee)

HEAVY DUTY INTERNAL TYPE MIL-SPEC LOCKWASHERS

Retain locking tension under heavy loads.
Use with heavy bolts and nuts and with heat treated bolts.
Strong internal teeth lock into bolt head or nut to prevent backoff rotation.

Typical Applications: Castings, heavy machinery and equipment.

We also have standard Heavy Futy Internal Type Lockwashers.

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		MS35334
Screw	Diameter		Diameter		Thickness		Steel	Stainless	Alloy
Size	Min.	Max.	Min.	Max.	Min.	Max.	Plated	Steel	Bronze
1/4	0.256	0.267	0.500	0.536	0.035	0.045	-19	---	---
5/16	0.320	0.332	0.590	0.607	0.040	0.050	-20	---	---
3/8	0.384	0.398	0.700	0.748	0.042	0.050	-21	---	---
7/16	0.448	0.464	0.800	0.858	0.050	0.067	-22*	---	---
1/2	0.512	0.530	0.880	0.924	0.055	0.067	-23	---	---
9/16	0.576	0.596	0.990	1.034	0.055	0.067	-24*	---	---
5/8	0.640	0.663	1.100	1.135	0.059	0.067	-25	---	---
3/4	0.768	0.795	1.240	1.265	0.070	0.084	-26	---	---
7/8	0.894	0.927	1.400	1.447	0.075	0.084	-27	---	---
* Inactive for new design per specification but still available.

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.