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USS Flat Washers

USS-Washers.jpg
United States Standard or USS Flatwashers were developed to satisfy engineering requirements in the majority of industrial applications in all fields of manufacturing, maintenance and repair. The Outer Diameter (OD), Inner Diameter(ID) and Thickness (Th) specifications were developed to meet the broadest possible number of applications.

All listed sizes of USS flatwashers are available in steel with either a plain or clear zinc finish. Galvanized washers are also available but not as a stock product and not in all sizes. USS Flat Washers are available in 50 lb cartons, also known as 1/4 kegs.

For flat washers requiring non-standard dimensions, please see Flat Washers.

Basic Part Number Bolt Size Inner Diameter (ID) Outer Diameter (OD) Thickness (Th) Approx LBs per 1000 Approx Pcs per 50 lb Carton Approx Pcs per LB
WUSS0.18 3/16 1/4 9/16 .036/.065 2.8 18,050 361
WUSS0.25 1/4 5/16 3/4 .051/.080 6.7 7,450 149
WUSS0.31 5/16 3/8 7/8 .064/.104 11.5 4,350 87
WUSS0.37 3/8 7/16 1 .064/.104 14.9 3,350 67
WUSS0.43 7/16 1/2 1 1/4 .064/.104 24.4 2,050 41
WUSS0.50 1/2 9/16 1 3/8 .086/.132 38.5 1,300 26
WUSS0.56 9/16 5/8 1 15/32 .086/.132 45.5 1,100 22
WUSS0.62 5/8 11/16 1 3/4 .108/.160 77 650 13
WUSS0.75 3/4 13/16 2 .122/.177 110 455 9.1
WUSS0.87 7/8 15/16 2 1/4 .136/.192 153 325 6.5
WUSS1.00 1 1 1/16 2 1/2 .136/.192 188 265 5.3
WUSS1.12 1 1/8 1 1/4 2 3/4 .136/.192 220 225 4.5
WUSS1.25 1 1/4 1 3/8 3 .136/.192 260 190 3.8
WUSS1.37 1 3/8 1 1/2 3 1/4 .153/.213 333 150 3
WUSS1.50 1 1/2 1 5/8 3 1/2 .153/.213 385 130 2.6
WUSS1.62 1 5/8 1 3/4 3 3/4 .153/.213 448 115 2.3
WUSS1.75 1 3/4 1 7/8 4 .153/.213 500 100 2
WUSS1.87 1 7/8 2 4 1/4 .153/.213 569 90 1.8
WUSS2.00 2 2 1/8 4 1/2 .153/.213 630 79 1.6
WUSS2.25 2 1/4 2 3/8 4 3/4 .193/.248 826 60 1.2
WUSS2.50 2 1/2 2 5/8 5 .210/.280 961 52 1
WUSS2.75 2 3/4 2 7/8 5 1/4 .228/.310 1100 45 0.9
WUSS3.00 3 3 1/8 5 1/2 .249/.327 1300 43 0.8


USS Flat Washer

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APEX FASTENERS, Inc - 15858 Business Center Drive - Irwindale, CA 91706 USA
APEX Fasteners supplies standard and custom screws, nut retainers, shoulder screws, plastites and taptites, all types of rivets, spring steel fasteners and special stampings, sems screws in standard, fractional or metric to electronics, aviation and other OEM industries worldwide. ApexFasteners.com custom manufactures screw machine components for electronic enclosure hardware as well as cold forming and cold headed specials for assembly and production requirements.
Tel: (626) 962-2219 - info@apexfasteners.com
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