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Alternate Internal Lockwashers
Nominal Inside Outside Nominal WCL
Screw Diameter Diameter Material Product
Size Min. Max. Min. Max. Thickness Plain Steel
8 0.160 0.165 0.375 0.380 0.014 INT-0164-09-00
10 0.199 0.204 0.375 0.380 0.014 INT-0190-04-00
10 0.199 0.204 0.370 0.381 0.022 INT-0190-12-00
1/4 0.260 0.265 0.470 0.475 0.025 INT-0250-03-00
3/8 0.380 0.387 0.557 0.567 0.017 INT-0375-05-00
 3/8   0.380 0.387 0.557 0.567 0.025  INT-0375-10-00  
 3/8   0.380 0.387 0.557 0.567 0.020  INT-0375-13-00  
 7/16   0.472 0.480 0.593 0.607 0.017  INT-0437-01-00  
 7/16   0.472 0.480 0.593 0.607 0.022  INT-0437-09-00  
 1/2   0.505 0.512 0.620 0.630 0.020  INT-0500-02-00  
 1/2   0.505 0.512 0.620 0.630 0.013  INT-0500-12-00  
 3/4   0.757 0.670 1.047 1.077 0.022  INT-0750-12-00  

Alternate External Lockwashers
Nominal Inside Outside Nominal WCL
Screw Diameter Diameter Material Product
Size Min. Max. Min. Max. Thickness Plain Steel
1/2 0.526 0.536 1.739 1.761 0.055 EXT-0500-13-00
7/8 0.894 0.918 1.739 1.761 0.055 EXT-0875-03-00
1 1.052 1.072 1.610 1.640 0.022 EXT-1000-01-00
1 1.019 1.043 1.988 2.012 0.062 EXT-1000-03-00
1 1.019 1.043 1.928 1.948 0.062 EXT-1000-05-00
1 1/4 1.269 1.293 2.486 2.514 0.062 EXT-1250-02-00
1 1/4 1.269 1.293 1.928 1.948 0.062 EXT-1250-03-00

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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