FEATURES:
OD: 1-1/4"
ID: 5/16" size (fits tighly to 5/16" threaded fasteners)
Backing: 20 Gauge ASTM Grade 304 Stainless Steel
Bonded Rubber: 0.065" Black EPDM Rubber, 70 durometer hardness per ASTM D2000
Overall washer height before compression about .14
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