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Square Nuts

Square nuts give you more wrench bite than hex when clearances are tight or your hands are oily. Run Grade 2 coarse thread for general repairs and fixtures. Choose plain finish for dry indoor jobs, go zinc plated when you need extra corrosion resistance on equipment, racks and enclosures. We keep both ready to ship.

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Grade 2 Plain Finish Square Nuts - Coarse Thread (USS)
Grade 2 Plain Finish Square Nuts - Coarse Thread (USS)
Grade 2 plain steel square nuts with coarse USS threads, available in common diameters. Square profile provides secure wrenching and increased bearing surface, helping resist rotation and distribute load. Suited for structural and machinery fastening applications.
Item # Diameter Thickness Thread Size Thread Type Package Qty
1/4"-20 Grade 2 (USS) Plain Square Nut - 50 Pack
348204
1/4"
7/32"
1/4"-20
Coarse
50
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5/16"-18 Grade 2 (USS) Plain Square Nut - 50 Pack
348205
5/16"
17/64"
5/16"-18
Coarse
50
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3/8"-16 Grade 2 (USS) Plain Square Nut - 50 Pack
348206
3/8"
21/64"
3/8"-16
Coarse
50
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7/16"-14 Grade 2 (USS) Plain Square Nut - 25 Pack
348207
7/16"
3/8"
7/16"-14
Coarse
25
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1/2"-13 Grade 2 (USS) Plain Square Nut - 25 Pack
348208
1/2"
7/16"
1/2"-13
Coarse
25
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5/8"-11 Grade 2 (USS) Plain Square Nut - 10 Pack
348210
5/8"
35/64"
5/8"-11
Coarse
10
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3/4"-10 Grade 2 (USS) Plain Square Nut - 10 Pack
348212
3/4"
21/32"
3/4"-10
Coarse
10
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Grade 2 Zinc Plated Square Nuts - Coarse Thread (USS)
Grade 2 Zinc Plated Square Nuts - Coarse Thread (USS)
Grade 2 square nuts made from steel with a zinc-plated finish and USS coarse threads. The square head provides a more secure grip for tightening and zinc plating resists corrosion better than bare steel. Suitable for general fastening applications where simple, durable hardware is needed.
Item # Diameter Thickness Thread Size Thread Type Package Qty
1/4"-20 Grade 2 (USS) Square Nut - 50 Pack
348004
1/4"
7/32"
1/4"-20
Coarse
50
Log in to view price
5/16"-18 Grade 2 (USS) Square Nut - 50 Pack
348005
5/16"
17/64"
5/16"-18
Coarse
50
Log in to view price
3/8"-16 Grade 2 (USS) Square Nut - 50 Pack
348006
3/8"
21/64"
3/8"-16
Coarse
50
Log in to view price
7/16"-14 Grade 2 (USS) Square Nut - 25 Pack
348007
7/16"
3/8"
7/16"-14
Coarse
25
Log in to view price
1/2"-13 Grade 2 (USS) Square Nut - 25 Pack
348008
1/2"
7/16"
1/2"-13
Coarse
25
Log in to view price
5/8"-11 Grade 2 (USS) Square Nut - 10 Pack
348010
5/8"
35/64"
5/8"-11
Coarse
10
Log in to view price
3/4"-10 Grade 2 (USS) Square Nut - 10 Pack
348012
3/4"
21/32"
3/4"-10
Coarse
10
Log in to view price
1/4"-20 Grade 2 (USS) Plain Square Nut - 50 Pack
Grade 2 Plain Finish Square Nuts - Coarse Thread (USS)
7 options | Item #: 348204
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1/4"-20 Grade 2 (USS) Square Nut - 50 Pack
Grade 2 Zinc Plated Square Nuts - Coarse Thread (USS)
7 options | Item #: 348004
Price
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