Locknuts

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Grade C (USS) Ultra-Lock Reversible Lock Nuts
Grade C (USS) Ultra-Lock Reversible Lock Nuts
Produced from medium carbon steel and heat treated to meet Grade 8 performance standards. Developed for Automotive Fastener Engineering specifications. Features grade C prevailing torque design, reversible installation, and corrosion resistant yellow dichromate finish. Withstands severe shock and vibration loads, maintaining locking torque through up to 5 installations.
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1/4" 7/32" 1/4"-20 Coarse 50 Log in to view price
5/16" 17/64" 5/16"-18 Coarse 50 Log in to view price
3/8" 21/64" 3/8"-16 Coarse 50 Log in to view price
7/16" 3/8" 7/16"-14 Coarse 50 Log in to view price
1/2" 7/16" 1/2"-13 Coarse 50 Log in to view price
9/16" 31/64" 9/16"-12 Coarse 25 Log in to view price
5/8" 35/64" 5/8"-11 Coarse 25 Log in to view price
3/4" 41/64" 3/4"-10 Coarse 25 Log in to view price
7/8" 47/64" 7/8"-9 Coarse 10 Log in to view price
1" 55/64" 1"-8 Coarse 10 Log in to view price
Grade 8 (USS) Nylon Insert Lock Nuts
Grade 8 (USS) Nylon Insert Lock Nuts
Pairing with Grade 8 bolts (6 dots/double notched corners), these zinc-yellow nuts have a purple nylon collar to lock vibration up to 250°F. The 360° locking ring prevents thread galling and allows easy adjustments. Perfect for heavy-duty fastener assemblies.
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1/4" 1/4"-20 Coarse 50 Log in to view price
5/16" 5/16"-18 Coarse 50 Log in to view price
3/8" 3/4"-16 Coarse 25 Log in to view price
7/16" 7/16"-14 Coarse 25 Log in to view price
1/2" 1/2"-13 Coarse 25 Log in to view price
9/16" 9/16"-12 Coarse 25 Log in to view price
5/8" 5/8"-11 Coarse 25 Log in to view price
3/4" 3/4"-10 Coarse 10 Log in to view price
7/8" 7/8"-9 Coarse 10 Log in to view price
1" 1"-8 Coarse 10 Log in to view price
1-1/8" 1-1/8"-7 Coarse 10 Log in to view price
1-1/4" 1-1/4"-7 Coarse 10 Log in to view price
Grade C (SAE) Ultra-Lock Reversible Lock Nuts
Grade C (SAE) Ultra-Lock Reversible Lock Nuts
Produced from medium carbon steel and heat treated to meet Grade 8 performance standards. Developed for Automotive Fastener Engineering specifications. Features grade C prevailing torque design, reversible installation, and corrosion resistant yellow dichromate finish. Withstands severe shock and vibration loads, maintaining locking torque through up to 5 installations.
Diameter Thickness Thread Size Thread Type Package Qty Item #
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1/4" 7/32" 1/4"-28 Fine 50 Log in to view price
5/16" 17/64" 5/16"-24 Fine 50 Log in to view price
3/8" 21/64" 3/8"-24 Fine 50 Log in to view price
7/16" 3/8" 7/16"-20 Fine 50 Log in to view price
1/2" 7/16" 1/2"-20 Fine 50 Log in to view price
9/16" 31/64" 9/16"-18 Fine 25 Log in to view price
5/8" 35/64" 5/8"-18 Fine 25 Log in to view price
3/4" 41/64" 3/4"-16 Fine 25 Log in to view price
7/8" 47/64" 7/8"-14 Fine 10 Log in to view price
1" 55/64" 1"-14 Fine 10 Log in to view price
Grade 8 (SAE) Nylon Insert Lock Nuts
Grade 8 (SAE) Nylon Insert Lock Nuts
Built for Grade 8 applications (double notches or 6 dots), these nuts offer a purple nylon collar and are zinc-yellow plated to fight corrosion. They lock firmly at up to 250°F, ensuring a 360° hold. Ideal for high-strength, vibration-prone assemblies.
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1/4" 1/4"-28 Fine 50 Log in to view price
5/16" 5/16"-24 Fine 50 Log in to view price
3/8" 3/8"-24 Fine 25 Log in to view price
7/16" 7/16"-20 Fine 25 Log in to view price
1/2" 1/2"-20 Fine 25 Log in to view price
9/16" 9/16"-18 Fine 25 Log in to view price
5/8" 5/8"-18 Fine 25 Log in to view price
3/4" 3/4"-16 Fine 10 Log in to view price
7/8" 7/8"-14 Fine 10 Log in to view price
1" 1"-14 Fine 10 Log in to view price
1-1/8" 1-1/8"-12 Fine 10 Log in to view price
1-1/4" 1-1/4"-12 Fine 10 Log in to view price
Grade 8 (USS) Nylon Insert Flange Lock Nuts
Grade 8 (USS) Nylon Insert Flange Lock Nuts
Produced from medium carbon steel and heat treated to meet Grade 8 performance standards. Developed to meet specifications of Automotive Fastener Engineering Specialists. Features a proven torque-tension relationship with Grade 8 bolts. Identified by six dots at 60° intervals on the crown. Zinc yellow plated with cadmium and wax finish. MADE IN THE U.S.A.
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1/4" 1/4"-20 Coarse 50 Log in to view price
5/16" 5/16"-18 Coarse 50 Log in to view price
3/8" 3/8"-16 Coarse 25 Log in to view price
1/2" 1/2"-13 Coarse 25 Log in to view price
5/8" 5/8"-11 Coarse 25 Log in to view price
3/4" 3/4"-10 Coarse 10 Log in to view price

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