Hex Nuts

Grade 8 Hex Nuts - Coarse Thread (USS)

Grade 8 Torque-Tension Hex Nuts - Coarse Thread (USS)

Grade 8 Hex Nuts - Fine Thread (SAE)

Grade 8 Plain Hex Nuts - Fine Thread (SAE)

Grade 8 Torque-Tension Hex Nuts - Fine Thread (SAE)

Grade 8 Hex Nuts - Coarse Thread (USS)

For demanding applications, these coarse‑thread Grade 8 nuts meet SAE and IFI specs. RoHS‑compliant zinc yellow plating offers corrosion protection, while heat treatment and full traceability ensure reliability. Perfect for high‑stress MRO or construction projects when paired with matching Grade 8 cap screws.

Diameter	Height	Width Across Flats	Thread Size	Thread Type	Package Qty	Item #	Price Want to view pricing for this product? Log In or Create Login Not a Kimball Midwest Customer? Register
1/4"	7/32"	7/16"	1/4"-20	Coarse	100	343804	Log in to view price
1/4"-20 Grade 8 (USS) Hex Nut - 100 Pack Item Number: 343804 Package Weight: 0.7 lbs View Product Details Log in to Order
1/4"	7/32"	7/16"	1/4"-20	Coarse	500	3438042	Log in to view price
1/4"-20 Grade 8 (USS) Hex Nut - 500 Pack Item Number: 3438042 Package Weight: 3.5 lbs View Product Details Log in to Order
5/16"	17/64"	1/2"	5/16"-18	Coarse	100	343805	Log in to view price
5/16"-18 Grade 8 (USS) Hex Nut - 100 Pack Item Number: 343805 Package Weight: 1.1 lbs View Product Details Log in to Order
5/16"	17/64"	1/2"	5/16"-18	Coarse	500	3438052	Log in to view price
5/16"-18 Grade 8 (USS) Hex Nut - 500 Pack Item Number: 3438052 Package Weight: 5.5 lbs View Product Details Log in to Order
3/8"	21/64"	9/16"	3/8"-16	Coarse	100	343806	Log in to view price
3/8"-16 Grade 8 (USS) Hex Nut - 100 Pack Item Number: 343806 Package Weight: 1.5 lbs View Product Details Log in to Order
3/8"	21/64"	9/16"	3/8"-16	Coarse	200	3438062	Log in to view price
3/8"-16 Grade 8 (USS) Hex Nut - 200 Pack Item Number: 3438062 Package Weight: 3 lbs View Product Details Log in to Order
7/16"	3/8"	11/16"	7/16"-14	Coarse	50	343807	Log in to view price
7/16"-14 Grade 8 (USS) Hex Nut - 50 Pack Item Number: 343807 Package Weight: 1.4 lbs View Product Details Log in to Order
7/16"	3/8"	11/16"	7/16"-14	Coarse	100	3438071	Log in to view price
7/16"-14 Grade 8 (USS) Hex Nut - 100 Pack Item Number: 3438071 Package Weight: 2.8 lbs View Product Details Log in to Order
1/2"	7/16"	3/4"	1/2"-13	Coarse	50	343808	Log in to view price
1/2"-13 Grade 8 (USS) Hex Nut - 50 Pack Item Number: 343808 Package Weight: 1.9 lbs View Product Details Log in to Order
1/2"	7/16"	3/4"	1/2"-13	Coarse	100	3438082	Log in to view price
1/2"-13 Grade 8 (USS) Hex Nut - 100 Pack Item Number: 3438082 Package Weight: 3.8 lbs View Product Details Log in to Order
9/16"	31/64"	7/8"	9/16"-12	Coarse	50	343809	Log in to view price
9/16"-12 Grade 8 (USS) Hex Nut - 50 Pack Item Number: 343809 Package Weight: 2.9 lbs View Product Details Log in to Order
9/16"	31/64"	7/8"	9/16"-12	Coarse	100	3438091	Log in to view price
9/16"-12 Grade 8 (USS) Hex Nut - 100 Pack Item Number: 3438091 Package Weight: 5.8 lbs View Product Details Log in to Order

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Grade 8 Torque-Tension Hex Nuts - Coarse Thread (USS)

Engineered to optimize torque‑to‑tension ratios, these Grade 8 nuts provide consistent clamp loads in critical assemblies. Heat‑treated alloy steel ensures high strength, and the plain finish suits typical machinery builds. Pair them with Grade 8 cap screws in heavy equipment or engine applications needing reliable tension control.

Diameter	Height	Width Across Flats	Thread Size	Thread Type	Package Qty	Item #	Price Want to view pricing for this product? Log In or Create Login Not a Kimball Midwest Customer? Register
1/4"	7/32"	7/16"	1/4"-20	Coarse	100	345804	Log in to view price
1/4"-20 Grade 8 (USS) Torque-Tension Hex Nuts - 100 Pack Item Number: 345804 Package Weight: 0.7 lbs View Product Details Log in to Order
5/16"	17/64"	1/2"	5/16"-18	Coarse	100	345805	Log in to view price
5/16"-18 Grade 8 (USS) Torque-Tension Hex Nuts - 100 Pack Item Number: 345805 Package Weight: 1 lbs View Product Details Log in to Order
3/8"	21/64"	9/16"	3/8"-16	Coarse	100	345806	Log in to view price
3/8"-16 Grade 8 (USS) Torque-Tension Hex Nuts - 100 Pack Item Number: 345806 Package Weight: 1.5 lbs View Product Details Log in to Order
7/16"	3/8"	11/16"	7/16"-14	Coarse	50	345807	Log in to view price
7/16"-14 Grade 8 (USS) Torque-Tension Hex Nuts - 50 Pack Item Number: 345807 Package Weight: 1.4 lbs View Product Details Log in to Order
1/2"	7/16"	3/4"	1/2"-13	Coarse	50	345808	Log in to view price
1/2"-13 Grade 8 (USS) Torque-Tension Hex Nuts - 50 Pack Item Number: 345808 Package Weight: 1.8 lbs View Product Details Log in to Order
9/16"	31/64"	7/8"	9/16"-12	Coarse	50	345809	Log in to view price
9/16"-12 Grade 8 (USS) Torque-Tension Hex Nuts - 50 Pack Item Number: 345809 Package Weight: 2.8 lbs View Product Details Log in to Order
5/8"	35/64"	15/16"	5/8"-11	Coarse	50	345810	Log in to view price
5/8"-11 Grade 8 Torque-Tension Hex Nuts - 50 Pack Item Number: 345810 Package Weight: 3.6 lbs View Product Details Log in to Order
7/8"	3/4"	1-5/16"	7/8"-9	Coarse	10	345814	Log in to view price
7/8"-9 Grade 8 (USS) Torque-Tension Hex Nuts - 10 Pack Item Number: 345814 Package Weight: 1.9 lbs View Product Details Log in to Order

Grade 8 Hex Nuts - Fine Thread (SAE)

Zinc yellow plated and heat‑treated, these SAE fine‑thread nuts meet Grade 8 specs for ultimate holding power. The shortened thread pitch suits precision assemblies like engine components or structural frames. Pair with matching Grade 8 cap screws for a secure clamp in demanding automotive or industrial tasks.

Diameter	Height	Width Across Flats	Thread Size	Thread Type	Package Qty	Item #	Price Want to view pricing for this product? Log In or Create Login Not a Kimball Midwest Customer? Register
1/4"	7/32"	7/16"	1/4"-28	Fine	100	343904	Log in to view price
1/4"-28 Grade 8 (SAE) Hex Nut - 100 Pack Item Number: 343904 Package Weight: 0.7 lbs View Product Details Log in to Order
5/16"	17/64"	1/2"	5/16"-24	Fine	100	343905	Log in to view price
5/16"-24 Grade 8 (SAE) Hex Nut - 100 Pack Item Number: 343905 Package Weight: 1.1 lbs View Product Details Log in to Order
3/8"	21/64"	9/16"	3/8"-24	Fine	100	343906	Log in to view price
3/8"-24 Grade 8 (SAE) Hex Nut - 100 Pack Item Number: 343906 Package Weight: 1.5 lbs View Product Details Log in to Order
7/16"	3/8"	11/16"	7/16"-20	Fine	50	343907	Log in to view price
7/16"-20 Grade 8 (SAE) Hex Nut - 50 Pack Item Number: 343907 Package Weight: 1.4 lbs View Product Details Log in to Order
1/2"	7/16"	3/4"	1/2"-20	Fine	50	343908	Log in to view price
1/2"-20 Grade 8 (SAE) Hex Nut - 50 Pack Item Number: 343908 Package Weight: 1.8 lbs View Product Details Log in to Order
9/16"	31/64"	7/8"	9/16"-18	Fine	50	343909	Log in to view price
9/16"-18 Grade 8 (SAE) Hex Nut - 50 Pack Item Number: 343909 Package Weight: 2.8 lbs View Product Details Log in to Order
5/8"	35/64"	15/16"	5/8"-18	Fine	50	343910	Log in to view price
5/8"-18 Grade 8 (SAE) Hex Nut - 50 Pack Item Number: 343910 Package Weight: 3.5 lbs View Product Details Log in to Order
3/4"	41/64"	1-1/8"	3/4"-16	Fine	25	343912	Log in to view price
3/4"-16 Grade 8 (SAE) Hex Nut - 25 Pack Item Number: 343912 Package Weight: 2.9 lbs View Product Details Log in to Order
7/8"	3/4"	1-5/16"	7/8"-14	Fine	10	343914	Log in to view price
7/8"-14 Grade 8 (SAE) Hex Nut - 10 Pack Item Number: 343914 Package Weight: 1.9 lbs View Product Details Log in to Order
1"	55/64"	1-1/2"	1"-14	Fine	10	343916	Log in to view price
1"-14 Grade 8 (SAE) Hex Nut - 10 Pack Item Number: 343916 Package Weight: 2.7 lbs View Product Details Log in to Order

Grade 8 Plain Hex Nuts - Fine Thread (SAE)

Designed for fine‑thread Grade 8 assemblies, these plain‑finish nuts provide excellent clamp force with minimal slippage. Heat‑treated alloy steel ensures durability, while double chamfers help with wrench engagement. Use them in automotive or machinery builds where high strength matters more than extra corrosion coating.

Diameter	Height	Width Across Flats	Thread Size	Thread Type	Package Qty	Item #	Price Want to view pricing for this product? Log In or Create Login Not a Kimball Midwest Customer? Register
1-1/8"	31/32"	1-11/16"	1-1/8"-12	Fine	5	343918	Log in to view price
1-1/8"-12 Grade 8 (SAE) Plain Hex Nut - 5 Pack Item Number: 343918 Package Weight: 2 lbs View Product Details Log in to Order
1-1/4"	1-1/16"	1-7/8"	1-1/4"-7	Fine	5	343920	Log in to view price
1-1/4"-12 Grade 8 (SAE) Plain Hex Nut - 5 Pack Item Number: 343920 Package Weight: 2.6 lbs View Product Details Log in to Order
1-1/2"	1-9/32"	2-1/4"	1-1/2"-12	Fine	1	343924	Log in to view price
1-1/2"-12 Grade 8 (SAE) Plain Hex Nut Item Number: 343924 Package Weight: 0.9 lbs View Product Details Log in to Order

Grade 8 Torque-Tension Hex Nuts - Fine Thread (SAE)

With a design that optimizes torque‑to‑tension consistency, these Grade 8 SAE nuts reduce clamp variability. Perfect for critical engine, machinery, or structural connections. A plain finish suits typical indoor applications, while the specialized geometry ensures lower installation torque. Pair with Grade 8 screws for reliability.

Diameter	Height	Width Across Flats	Thread Size	Thread Type	Package Qty	Item #	Price Want to view pricing for this product? Log In or Create Login Not a Kimball Midwest Customer? Register
1/4"	7/32"	7/16"	1/4"-28	Fine	100	345904	Log in to view price
1/4"-28 Grade 8 (SAE) Torque-Tension Hex Nuts - 100 Pack Item Number: 345904 Package Weight: 0.7 lbs View Product Details Log in to Order
5/16"	17/64"	1/2"	5/16"-24	Fine	100	345905	Log in to view price
5/16"-24 Grade 8 (SAE) Torque-Tension Hex Nuts - 100 Pack Item Number: 345905 Package Weight: 1 lbs View Product Details Log in to Order
3/8"	21/64"	9/16"	3/8"-24	Fine	100	345906	Log in to view price
3/8"-24 Grade 8 (SAE) Torque-Tension Hex Nuts - 100 Pack Item Number: 345906 Package Weight: 1.5 lbs View Product Details Log in to Order
7/16"	3/8"	11/16"	7/16"-20	Fine	50	345907	Log in to view price
7/16"-20 Grade 8 (SAE) Torque-Tension Hex Nuts - 50 Pack Item Number: 345907 Package Weight: 1.4 lbs View Product Details Log in to Order
1/2"	31/64"	7/8"	1/2"-20	Fine	50	345908	Log in to view price
1/2"-20 Grade 8 (SAE) Torque-Tension Hex Nuts - 50 Pack Item Number: 345908 Package Weight: 1.8 lbs View Product Details Log in to Order
9/16"	31/64"	7/8"	9/16"-18	Fine	50	345909	Log in to view price
9/16"-18 Grade 8 (SAE) Torque-Tension Hex Nuts - 50 Pack Item Number: 345909 Package Weight: 2.8 lbs View Product Details Log in to Order
7/8"	3/4"	1-5/16"	7/8"-14	Fine	10	345914	Log in to view price
7/8"-14 Grade 8 (SAE) Torque-Tension Hex Nuts - 10 Pack Item Number: 345914 Package Weight: 1.8 lbs View Product Details Log in to Order