System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Thread Size Thread Size | Hide |
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Material Material |
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Finish Finish |
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Nut Type Nut Type | Show |
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Locking Type Locking Type |
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| Nylon Insert | Distorted Thread |
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| Cotter Pin | Flex-Top |
Thread Spacing Thread Spacing |
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Thread Direction Thread Direction |
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 | Right Hand |
Thread Type Thread Type |
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Minimum Slot Depth Minimum Slot Depth |
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For Cotter Pin Diameter For Cotter Pin Diameter |
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Minimum Slot Width Minimum Slot Width |
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Drive Style Drive Style |
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 | External Hex |
Insert Maximum Temperature Insert Maximum Temperature |
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Distorted Thread Type Distorted Thread Type |
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 | Top Lock |
Specifications Met Specifications Met |
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About Nuts, Materials, and Finishes
More
High-Strength Steel Nylon-Insert Locknuts—Grade 8
A nylon insert grips the bolt to resist loosening without damaging threads. These nuts are reusable, but their holding power lessens with each use. Made from Grade 8 steel, they're about 25% stronger than medium-strength steel locknuts.
Steel locknuts without a finish are ready to be painted or finished.
Black-oxide steel locknuts have a dark surface color and are mildly corrosion resistant in dry environments.
Zinc yellow-chromate plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Medium-Strength Steel Nylon-Insert Locknuts—Grade 5
A nylon insert grips the bolt to resist loosening without damaging threads. These locknuts are reusable, but their holding power lessens with each use. They are suitable for fastening most machinery and equipment. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | ||||||
|---|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 41/64" | 220° | 25 | 000000000 | 000000 |
Low-Strength Steel Nylon-Insert Locknuts
These locknuts have a nylon insert that grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. About half the strength of medium-strength steel locknuts, they're for light duty fastening applications, such as securing access panels.
Zinc-plated steel locknuts are corrosion resistant in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 41/64" | 220° | 25 | 000000000 | 00000 |
18-8 Stainless Steel Nylon-Insert Locknuts
These locknuts have good chemical resistance and may be mildly magnetic. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use.
Black-oxide stainless steel nuts have a dark surface color.
For technical drawings and 3-D models, click on a part number.
Low-Strength Steel Thin Nylon-Insert Locknuts
These locknuts are about half the height of standard nylon-insert locknuts. Use them in light duty low-clearance applications or jam one against a hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use.
Zinc-plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 23/64" | 220° | 100 | 000000000 | 000000 |
18-8 Stainless Steel Thin Nylon-Insert Locknuts
These locknuts have good chemical resistance and may be mildly magnetic. They're about half the height of standard nylon-insert locknuts. Use them in low-clearance applications or jam one against a hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 23/64" | 220° | 1 | 000000000 | 000000 |
Low-Strength Steel Locknuts for use with Cotter Pins
Secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They're also known as castle nuts and slotted nuts. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 31/64" | 7/64" | 0.15" | 0.163" | 5 | 000000000 | 00000 |
Steel Flex-Top Locknuts for Heavy Vibration
Threads at the top of these locknuts expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging the threads. These locknuts have equivalent strength to Grade 8 steel locknuts.
Cadmium-plated steel locknuts are corrosion resistant in wet environments. The plating adds lubricity, so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel | |||||
|---|---|---|---|---|---|
| 9/16"-18 | 11/16" | 3/8" | 1 | 000000000 | 00000 |
Mil. Spec. Steel Flex-Top Locknuts for Heavy Vibration
Choose these locknuts for their adherence to strict military standards for material and construction. Threads at the top of the nut expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. These locknuts have equivalent strength to Grade 8 steel locknuts. A cadmium yellow-chromate plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 11/16" | MS21045-9 | 1 | 000000000 | 00000 |
High-Strength Steel Top-Lock Distorted-Thread Locknuts
An irregularly shaped thread at the top of the nut grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. Comparable in strength to Grade 8 bolts, they're about 25% stronger than medium-strength steel locknuts.
Steel locknuts without a finish are ready to be painted or finished.
Black-oxide locknuts are mildly corrosion resistant in dry environments and blend in with dark surfaces.
Zinc-plated and zinc yellow-chromate plated locknuts resist corrosion in wet environments.
Zinc-aluminum coated locknuts are more corrosion resistant in wet environments than zinc-plated and zinc yellow-chromate plated locknuts.
Cadmium-plated locknuts resist corrosion in wet environments and have good lubricity, so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel—Grade C | |||||
|---|---|---|---|---|---|
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
Black Oxide Steel—Grade C | |||||
| 9/16"-18 | 7/8" | 31/64" | 10 | 000000000 | 0000 |
Zinc-Plated Steel—Grade C | |||||
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 0000 |
Zinc Yellow-Chromate Plated Steel—Grade C | |||||
| 9/16"-18 | 7/8" | 31/64" | 10 | 000000000 | 0000 |
Zinc-Aluminum Coated Steel—Grade C | |||||
| 9/16"-18 | 7/8" | 31/64" | 1 | 000000000 | 0000 |
Cadmium-Plated Steel—Grade C | |||||
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 00000 |