Locknuts
52 results
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.
| Diameter | Thickness | Thread Size | Thread Type | Package Qty | Item # |
Price
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|---|---|---|---|---|---|---|
| 1/4" | 7/32" | 1/4"-20 | Coarse | 50 |
348704
|
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| 5/16" | 17/64" | 5/16"-18 | Coarse | 50 |
348705
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| 3/8" | 21/64" | 3/8"-16 | Coarse | 50 |
348706
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| 7/16" | 3/8" | 7/16"-14 | Coarse | 50 |
348707
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| 1/2" | 7/16" | 1/2"-13 | Coarse | 50 |
348708
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| 9/16" | 31/64" | 9/16"-12 | Coarse | 25 |
348709
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| 5/8" | 35/64" | 5/8"-11 | Coarse | 25 |
348710
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| 3/4" | 41/64" | 3/4"-10 | Coarse | 25 |
348712
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| 7/8" | 47/64" | 7/8"-9 | Coarse | 10 |
348714
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| 1" | 55/64" | 1"-8 | Coarse | 10 |
348716
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Package Weight: 2.7 lbs
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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.
| Diameter | Thread Size | Thread Type | Package Qty | Item # |
Price
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|---|---|---|---|---|---|
| 1/4" | 1/4"-20 | Coarse | 50 |
348404
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Package Weight: 0.5 lbs
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| 5/16" | 5/16"-18 | Coarse | 50 |
348405
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Package Weight: 0.6 lbs
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| 3/8" | 3/4"-16 | Coarse | 25 |
348406
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Package Weight: 0.4 lbs
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| 7/16" | 7/16"-14 | Coarse | 25 |
348407
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Package Weight: 0.6 lbs
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| 1/2" | 1/2"-13 | Coarse | 25 |
348408
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Package Weight: 1.1 lbs
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| 9/16" | 9/16"-12 | Coarse | 25 |
348409
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Package Weight: 1.7 lbs
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| 5/8" | 5/8"-11 | Coarse | 25 |
348410
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Package Weight: 2.2 lbs
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| 3/4" | 3/4"-10 | Coarse | 10 |
348412
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Package Weight: 1.3 lbs
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|||||
| 7/8" | 7/8"-9 | Coarse | 10 |
348414
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| 1" | 1"-8 | Coarse | 10 |
348416
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Package Weight: 2.7 lbs
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| 1-1/8" | 1-1/8"-7 | Coarse | 10 |
348418
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Package Weight: 3.8 lbs
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| 1-1/4" | 1-1/4"-7 | Coarse | 10 |
348420
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Package Weight: 5.7 lbs
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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 # |
Price
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|---|---|---|---|---|---|---|
| 1/4" | 7/32" | 1/4"-28 | Fine | 50 |
348804
|
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| 5/16" | 17/64" | 5/16"-24 | Fine | 50 |
348805
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| 3/8" | 21/64" | 3/8"-24 | Fine | 50 |
348806
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| 7/16" | 3/8" | 7/16"-20 | Fine | 50 |
348807
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| 1/2" | 7/16" | 1/2"-20 | Fine | 50 |
348808
|
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| 9/16" | 31/64" | 9/16"-18 | Fine | 25 |
348809
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| 5/8" | 35/64" | 5/8"-18 | Fine | 25 |
348810
|
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| 3/4" | 41/64" | 3/4"-16 | Fine | 25 |
348812
|
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| 7/8" | 47/64" | 7/8"-14 | Fine | 10 |
348814
|
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| 1" | 55/64" | 1"-14 | Fine | 10 |
348816
|
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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.
| Diameter | Thread Size | Thread Type | Package Qty | Item # |
Price
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|---|---|---|---|---|---|
| 1/4" | 1/4"-28 | Fine | 50 |
348504
|
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|
Package Weight: 0.4 lbs
|
|||||
| 5/16" | 5/16"-24 | Fine | 50 |
348505
|
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|
Package Weight: 0.6 lbs
|
|||||
| 3/8" | 3/8"-24 | Fine | 25 |
348506
|
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|
Package Weight: 0.5 lbs
|
|||||
| 7/16" | 7/16"-20 | Fine | 25 |
348507
|
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|
Package Weight: 0.5 lbs
|
|||||
| 1/2" | 1/2"-20 | Fine | 25 |
348508
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|
Package Weight: 1.1 lbs
|
|||||
| 9/16" | 9/16"-18 | Fine | 25 |
348509
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|
Package Weight: 1.6 lbs
|
|||||
| 5/8" | 5/8"-18 | Fine | 25 |
348510
|
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|
Package Weight: 2.1 lbs
|
|||||
| 3/4" | 3/4"-16 | Fine | 10 |
348512
|
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|
Package Weight: 1.2 lbs
|
|||||
| 7/8" | 7/8"-14 | Fine | 10 |
348514
|
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|
Package Weight: 1.9 lbs
|
|||||
| 1" | 1"-14 | Fine | 10 |
348516
|
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|
Package Weight: 2.7 lbs
|
|||||
| 1-1/8" | 1-1/8"-12 | Fine | 10 |
348518
|
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|
Package Weight: 3.7 lbs
|
|||||
| 1-1/4" | 1-1/4"-12 | Fine | 10 |
348520
|
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|
Package Weight: 5.5 lbs
|
|||||
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.
| Diameter | Thread Size | Thread Type | Package Qty | Item # |
Price
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|---|---|---|---|---|---|
| 1/4" | 1/4"-20 | Coarse | 50 |
348604
|
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| 5/16" | 5/16"-18 | Coarse | 50 |
348605
|
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| 3/8" | 3/8"-16 | Coarse | 25 |
348606
|
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| 1/2" | 1/2"-13 | Coarse | 25 |
348608
|
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| 5/8" | 5/8"-11 | Coarse | 25 |
348610
|
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| 3/4" | 3/4"-10 | Coarse | 10 |
348612
|
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Pkg Qty: 25
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Pkg Qty: 50
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Pkg Qty: 25
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