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
|
||||||
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
|
Log in to view price
|
|
Package Weight: 0.5 lbs
|
|||||
|
5/16"
|
5/16"-18
|
Coarse
|
50
|
348405
|
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|
|
Package Weight: 0.6 lbs
|
|||||
|
3/8"
|
3/4"-16
|
Coarse
|
25
|
348406
|
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|
|
Package Weight: 0.4 lbs
|
|||||
|
7/16"
|
7/16"-14
|
Coarse
|
25
|
348407
|
Log in to view price
|
|
Package Weight: 0.6 lbs
|
|||||
|
1/2"
|
1/2"-13
|
Coarse
|
25
|
348408
|
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|
|
Package Weight: 1.1 lbs
|
|||||
|
9/16"
|
9/16"-12
|
Coarse
|
25
|
348409
|
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|
|
Package Weight: 1.7 lbs
|
|||||
|
5/8"
|
5/8"-11
|
Coarse
|
25
|
348410
|
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|
|
Package Weight: 2.2 lbs
|
|||||
|
3/4"
|
3/4"-10
|
Coarse
|
10
|
348412
|
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|
|
Package Weight: 1.3 lbs
|
|||||
|
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
|
|||||
|
1-1/8"
|
1-1/8"-7
|
Coarse
|
10
|
348418
|
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|
|
Package Weight: 3.8 lbs
|
|||||
|
1-1/4"
|
1-1/4"-7
|
Coarse
|
10
|
348420
|
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|
|
Package Weight: 5.7 lbs
|
|||||
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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Log In or Create Login Not a Kimball Midwest Customer? Register |
|---|---|---|---|---|---|---|
|
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
|
Log in to view price
|
|
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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Log In or Create Login Not a Kimball Midwest Customer? Register |
|---|---|---|---|---|---|
|
1/4"
|
1/4"-28
|
Fine
|
50
|
348504
|
Log in to view price
|
|
Package Weight: 0.4 lbs
|
|||||
|
5/16"
|
5/16"-24
|
Fine
|
50
|
348505
|
Log in to view price
|
|
Package Weight: 0.6 lbs
|
|||||
|
3/8"
|
3/8"-24
|
Fine
|
25
|
348506
|
Log in to view price
|
|
Package Weight: 0.5 lbs
|
|||||
|
7/16"
|
7/16"-20
|
Fine
|
25
|
348507
|
Log in to view price
|
|
Package Weight: 0.5 lbs
|
|||||
|
1/2"
|
1/2"-20
|
Fine
|
25
|
348508
|
Log in to view price
|
|
Package Weight: 1.1 lbs
|
|||||
|
9/16"
|
9/16"-18
|
Fine
|
25
|
348509
|
Log in to view price
|
|
Package Weight: 1.6 lbs
|
|||||
|
5/8"
|
5/8"-18
|
Fine
|
25
|
348510
|
Log in to view price
|
|
Package Weight: 2.1 lbs
|
|||||
|
3/4"
|
3/4"-16
|
Fine
|
10
|
348512
|
Log in to view price
|
|
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
|
Log in to view price
|
|
Package Weight: 3.7 lbs
|
|||||
|
1-1/4"
|
1-1/4"-12
|
Fine
|
10
|
348520
|
Log in to view price
|
|
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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Log In or Create Login Not a Kimball Midwest Customer? Register |
|---|---|---|---|---|---|
|
1/4"
|
1/4"-20
|
Coarse
|
50
|
348604
|
Log in to view price
|
|
5/16"
|
5/16"-18
|
Coarse
|
50
|
348605
|
Log in to view price
|
|
3/8"
|
3/8"-16
|
Coarse
|
25
|
348606
|
Log in to view price
|
|
1/2"
|
1/2"-13
|
Coarse
|
25
|
348608
|
Log in to view price
|
|
5/8"
|
5/8"-11
|
Coarse
|
25
|
348610
|
Log in to view price
|
|
3/4"
|
3/4"-10
|
Coarse
|
10
|
348612
|
Log in to view price
|
Top
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Pkg Qty: 50
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 10
Price
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 50
Price
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Pkg Qty: 50
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 25
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 10
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Pkg Qty: 50
Price
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Pkg Qty: 25
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Pkg Qty: 25
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