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Flat washers are used under bolt heads or nuts to increase the bearing area or offer greater hardness, so that the nut or bolt can be rotated without distortion of the bearing surface. Flat washers are also used to give tightness to a joint, to prevent leakage, and especially to distribute pressure under the head of a nut or bolt.

USS flat washers have a larger outer diameter than SAE flat washers. Unless the buyer has a specific USS or SAE requirement, the buyer should consider the measurements, based on need, and not whether the flat washer is USS or SAE.
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Material

Finish

Item #

Item Name

Type

Nominal Size

Material

Finish

Package Quantity

Web Price

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10NWUS N/A #10 USS FLAT WASHER N/A Per Pound N/A #10 N/A Carbon Steel N/A Plain N/A 50 QUOTE Add To Cart
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10NWUSZ N/A #10 USS FLAT WASHER ZINC PLATED N/A Per Pound N/A #10 N/A Carbon Steel N/A Zinc Plated N/A 50 QUOTE Add To Cart
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18NWUS N/A 3/16 USS FLAT WASHER N/A Per Pound N/A 3/16 N/A Carbon Steel N/A Plain N/A 50 QUOTE Add To Cart
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18NWUSZ N/A 3/16 USS FLAT WASHER ZINC PLATED N/A Per Pound N/A 3/16 N/A Carbon Steel N/A Zinc Plated N/A 50 QUOTE Add To Cart
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25NWUS N/A 1/4 USS FLAT WASHER N/A Per Pound N/A 1/4 N/A Carbon Steel N/A Plain N/A 50 QUOTE Add To Cart
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25NWUS8D N/A 1/4 USS FLAT WASHER GRADE 8 ZINC DICHROMATE N/A Each N/A 1/4 N/A SAE Grade 8 N/A Zinc Dichromate N/A 100 $5.73 Add To Cart
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25NWUSG N/A 1/4 USS FLAT WASHER GALVANIZED N/A Per Pound N/A 1/4 N/A Carbon Steel N/A Galvanized N/A 50 QUOTE Add To Cart
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25NWUSZ N/A 1/4 USS FLAT WASHER ZINC PLATED N/A Per Pound N/A 1/4 N/A Carbon Steel N/A Zinc Plated N/A 50 QUOTE Add To Cart
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25NWUS8D/DOM N/A 1/4 USS FLAT WASHER GRADE 8 ZINC DICHROMATE DOMESTIC N/A Each N/A 1/4 N/A SAE Grade 8 N/A Zinc Dichromate N/A 100 $6.30 Add To Cart
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25NWUS8Z/DOM N/A 1/4 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC N/A Each N/A 1/4 N/A SAE Grade 8 N/A Zinc Plated N/A 100 $6.05 Add To Cart
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25NWUS9D N/A 1/4 USS TENSION WASHER L9 ALLOY ZINC DICHROMATE N/A Each N/A 1/4 N/A L-9 N/A Zinc Dichromate N/A 100 $12.90 Add To Cart
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25NWUS8/DOM N/A 1/4 USS FLAT WASHER GRADE 8 DOMESTIC N/A Each N/A 1/4 N/A SAE Grade 8 N/A Plain N/A 6000 QUOTE Add To Cart
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31NWUS N/A 5/16 USS FLAT WASHER N/A Per Pound N/A 5/16 N/A Carbon Steel N/A Plain N/A 50 QUOTE Add To Cart
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31NWUS8D N/A 5/16 USS FLAT WASHER GRADE 8 ZINC DICHROMATE N/A Each N/A 5/16 N/A SAE Grade 8 N/A Zinc Dichromate N/A 100 $8.85 Add To Cart
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31NWUSG N/A 5/16 USS FLAT WASHER GALVANIZED N/A Per Pound N/A 5/16 N/A Carbon Steel N/A Galvanized N/A 50 QUOTE Add To Cart
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31NWUSZ N/A 5/16 USS FLAT WASHER ZINC PLATED N/A Per Pound N/A 5/16 N/A Carbon Steel N/A Zinc Plated N/A 50 QUOTE Add To Cart
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31NWUS8D/DOM N/A 5/16 USS FLAT WASHER GRADE 8 ZINC DICHROMATE DOMESTIC N/A Each N/A 5/16 N/A SAE Grade 8 N/A Zinc Dichromate N/A 100 $9.30 Add To Cart
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31NWUS8Z/DOM N/A 5/16 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC N/A Each N/A 5/16 N/A SAE Grade 8 N/A Zinc Plated N/A 100 $9.55 Add To Cart
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31NWUS9D N/A 5/16 USS TENSION WASHER L9 ALLOY ZINC DICHROMATE N/A Each N/A 5/16 N/A L-9 N/A Zinc Dichromate N/A 100 $17.48 Add To Cart
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31NWUS8/DOM N/A 5/16 USS FLAT WASHER GRADE 8 DOMESTIC N/A Each N/A 5/16 N/A SAE Grade 8 N/A Plain N/A 3500 QUOTE Add To Cart
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37NWUS N/A 3/8 USS FLAT WASHER N/A Per Pound N/A 3/8 N/A Carbon Steel N/A Plain N/A 50 QUOTE Add To Cart
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37NWUS8D N/A 3/8 USS FLAT WASHER GRADE 8 ZINC DICHROMATE N/A Each N/A 3/8 N/A SAE Grade 8 N/A Zinc Dichromate N/A 100 $11.43 Add To Cart
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37NWUSG N/A 3/8 USS FLAT WASHER GALVANIZED N/A Per Pound N/A 3/8 N/A Carbon Steel N/A Galvanized N/A 50 QUOTE Add To Cart
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37NWUSZ N/A 3/8 USS FLAT WASHER ZINC PLATED N/A Per Pound N/A 3/8 N/A Carbon Steel N/A Zinc Plated N/A 50 QUOTE Add To Cart
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37NWUS8D/DOM N/A 3/8 USS FLAT WASHER GRADE 8 ZINC DICHROMATE DOMESTIC N/A Each N/A 3/8 N/A SAE Grade 8 N/A Zinc Dichromate N/A 100 $12.00 Add To Cart
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