Finish Finish |
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System of Measurement System of Measurement |
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Thread Size Thread Size |
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Nut Type Nut Type |
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| Flange | Hex |
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| Locknut | Tamper Resistant |
Locking Type Locking Type |
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| Nylon Insert | Distorted Thread |
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| Serrations |
Hex Nut Profile Hex Nut Profile |
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 | Standard |
Height Height |
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Thread Direction Thread Direction |
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Thread Fit Thread Fit |
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Drive Style Drive Style |
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| External Hex | Serrated Edge |
DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Distorted Thread Type Distorted Thread Type |
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| Top Lock | Center Lock |
Insert Maximum Temperature Insert Maximum Temperature |
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For Pipe Material For Pipe Material |
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Maximum Pressure Maximum Pressure |
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About Nuts, Materials, and Finishes
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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Aluminum Nylon-Insert Locknuts
One-third the weight of steel, aluminum nuts resist corrosion in wet environments and are nonmagnetic. 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. | |
6061 Aluminum | ||||||
|---|---|---|---|---|---|---|
| 8-32 | 11/32" | 15/64" | 220° | 25 | 000000000 | 00000 |
| 10-24 | 3/8" | 15/64" | 220° | 25 | 000000000 | 0000 |
| 10-32 | 3/8" | 15/64" | 220° | 25 | 000000000 | 0000 |
| 1/4"-20 | 7/16" | 5/16" | 220° | 25 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 11/32" | 220° | 25 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 29/64" | 220° | 10 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 19/32" | 220° | 5 | 000000000 | 0000 |
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.
Zinc-aluminum coated locknuts are more corrosion resistant in wet environments than zinc-plated and zinc yellow-chromate plated locknuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Zinc-Aluminum Coated Steel—Grade C | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 25 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 7/32" | 25 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 10 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 10 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 5 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 5 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | 5 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 1 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 1 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 41/64" | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 1 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 1 | 000000000 | 00000 |
High-Strength Steel Center-Lock
Distorted-Thread Locknuts—Grade 8
These locknuts have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. They're about three times stronger than low-strength steel locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable.
Zinc-aluminum coated steel locknuts are more corrosion resistant in wet environments than zinc yellow-chromate plated steel locknuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Zinc-Aluminum Coated Steel—Grade 8 | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 10 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 1 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 1 | 000000000 | 00000 |
Low-Strength Steel Serrated Flange Locknuts
Serrations grip the material surface instead of the threads for easy installation and mild vibration resistance. The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. About half the strength of medium-strength steel flange locknuts, use them in light duty fastening applications, such as securing access panels. Height includes the flange.
Black-oxide steel flange locknuts are mildly corrosion resistant and have a dark surface color.
Zinc-aluminum-coated steel flange locknuts are more corrosion resistant than zinc-plated steel flange locknuts. They are comparable to Magni-coated locknuts.
For technical drawings and 3-D models, click on a part number.
Flange | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size | Wd. | Ht. | Dia. | Thick. | Pkg. Qty. | Pkg. | |
Zinc-Aluminum Coated Steel | |||||||
| 6-32 | 5/16" | 5/32" | 27/64" | 0.02" | 25 | 000000000 | 00000 |
| 8-32 | 11/32" | 13/64" | 15/32" | 0.02" | 25 | 000000000 | 0000 |
| 10-24 | 3/8" | 7/32" | 1/2" | 0.03" | 25 | 000000000 | 00000 |
| 10-32 | 3/8" | 7/32" | 1/2" | 0.03" | 25 | 000000000 | 00000 |
| 1/4"-20 | 7/16" | 15/64" | 19/32" | 0.04" | 10 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 15/64" | 19/32" | 0.04" | 10 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 9/32" | 43/64" | 0.04" | 10 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 9/32" | 43/64" | 0.04" | 10 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 11/32" | 3/4" | 0.04" | 10 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 11/32" | 3/4" | 0.04" | 10 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 25/64" | 3/4" | 0.04" | 5 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 25/64" | 3/4" | 0.04" | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 29/64" | 1 1/32" | 0.05" | 1 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 29/64" | 1 1/32" | 0.05" | 1 | 000000000 | 0000 |
| 9/16"-12 | 7/8" | 1/2" | 1 3/16" | 0.05" | 1 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 9/16" | 1 9/32" | 0.05" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 9/16" | 1 9/32" | 0.05" | 1 | 000000000 | 0000 |
Tamper-Resistant Serrated-Edge Locknuts
These nuts have serrations that dig into the material surface to resist loosening and are narrow to fit in tight spaces. They must be installed with a serrated-edge driver (sold separately). Use them to reduce the risk of unwanted removal for objects in public spaces such as signs, lighting fixtures, and displays. Made from aluminum, they're lightweight, corrosion resistant in wet evironments, and nonmagnetic.
For technical drawings and 3-D models, click on a part number.
Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Oil, Water
- Class: 150
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- Flanges: Use Class 125 aluminum
| Pipe Size | Max. Pressure | Each | |
NPSL Female | |||
|---|---|---|---|
| 1/4 | 150 psi @ 72° F | 000000000 | 00000 |
| 3/8 | 150 psi @ 72° F | 000000000 | 0000 |
| 1/2 | 150 psi @ 72° F | 000000000 | 0000 |
| 3/4 | 150 psi @ 72° F | 000000000 | 0000 |
| 1 | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | 150 psi @ 72° F | 000000000 | 00000 |
| 2 | 150 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | 150 psi @ 72° F | 000000000 | 00000 |
| 3 | 150 psi @ 72° F | 000000000 | 00000 |