About Nuts, Materials, and Finishes
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Left-Hand Threaded 18-8 Stainless Steel Thin Hex Nuts
These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. They have good chemical resistance and may be mildly magnetic. Also known as jam nuts, they are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place.
For technical drawings and 3-D models, click on a part number.
| Thread Size  | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||
|---|---|---|---|---|---|
| 4-40 | 1/4" | 1/16" | 1 | 000000000 | 00000 |
Left-Hand Threaded Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts
With threads that tighten to the left and made of 316 stainless steel, these nuts won’t loosen from counterclockwise motion in saltwater and corrosive environments. They’re half the height of standard hex nuts, so they fit where there’s low clearance. Sometimes called jam nuts, you can also jam them against standard nuts to hold them in place when fastening machines and equipment.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Width | Height | Each | |
316 Stainless Steel | ||||
|---|---|---|---|---|
| 4-40 | 1/4" | 1/16" | 000000000 | 00000 |
Mil. Spec. 18-8 Stainless Steel Narrow Hex Nuts
Choose these nuts for their adherence to strict military standards for material and construction. They have good chemical resistance and may be mildly magnetic. Also known as small-pattern hex nuts, they are about 20% narrower than standard hex nuts for use in tight spaces where standard hex nuts won’t fit.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| 4-40 | 3/16" | 1/16" | Fed. Spec. FF-N-836, NAS671C4 | 10 | 000000000 | 000000 |
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 | ||||||
|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 7/64" | 220° | 100 | 000000000 | 00000 |
Mil. Spec. Low-Strength Steel Thin Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction. 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. 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. | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | |||||||
|---|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 1/8" | 250° | MS21083N04, NASM21083 | 10 | 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.
Black-oxide stainless steel locknuts have a dark surface color.
For technical drawings and 3-D models, click on a part number.
Mil. Spec. 18-8 Stainless Steel Thin Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction. They have good chemical resistance and may be mildly magnetic. 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 | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 1/8" | 250° | MS21083C04, NASM21083 | 10 | 000000000 | 000000 |
18-8 Stainless Steel Flanged Knurled-Head Thumb Nuts
These thumb nuts have good chemical resistance and may be mildly magnetic. The flange distributes the load over a large area and reduces stress where the nut meets the material surface. A knurled head provides a slip-resistant grip for controlled adjustment.
For technical drawings and 3-D models, click on a part number.
Super-Corrosion-Resistant 316 Stainless
Steel Flanged Knurled-Head Thumb Nuts
These thumb nuts have excellent chemical resistance and can be used in saltwater environments. The flange distributes the load over a large area and reduces stress where the nut meets the material surface. A knurled head provides a slip-resistant grip for controlled adjustment. They may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Collar | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size | Dia. | Ht. | Head Dia. | Ht. | Pkg. Qty. | Pkg. | |
316 Stainless Steel | |||||||
| 4-40 | 1/4" | 1/8" | 5/16" | 1/4" | 1 | 000000000 | 000000 |
Brass Flanged Knurled-Head Thumb Nuts
These thumb nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. The flange distributes the load over a large area and reduces stress where the nut meets the material surface. A knurled head provides a slip-resistant grip for controlled adjustment.
For technical drawings and 3-D models, click on a part number.
Collar | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size | Dia. | Ht. | Head Dia. | Ht. | Pkg. Qty. | Pkg. | |
Brass | |||||||
| 4-40 | 5/16" | 9/64" | 3/8" | 1/4" | 25 | 000000000 | 00000 |
18-8 Stainless Steel Knurled-Head Thumb Nuts
These thumb nuts have good chemical resistance and may be mildly magnetic. The head is knurled for slip-resistant controlled adjustment and the collar raises the head to make it easy to grip.
Black-oxide stainless steel nuts have a dark surface color.
For technical drawings and 3-D models, click on a part number.
Collar | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Dia. | Ht. | Head Dia. | Ht. | Threading | Thread Dp. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
| 4-40 | 1/4" | 1/4" | 1/2" | 3/8" | Partially Threaded | 1/4" | 1 | 000000000 | 00000 |
| 4-40 | 1/4" | 1/4" | 3/4" | 3/8" | Fully Threaded | __ | 1 | 000000000 | 0000 |
| 4-40 | 1/4" | 1/2" | 1/2" | 5/8" | Partially Threaded | 3/8" | 1 | 000000000 | 0000 |
| 4-40 | 1/4" | 1/2" | 3/4" | 5/8" | Fully Threaded | __ | 1 | 000000000 | 0000 |
Black Oxide 18-8 Stainless Steel | |||||||||
| 4-40 | 1/4" | 1/2" | 1/2" | 5/8" | Partially Threaded | 3/8" | 1 | 000000000 | 0000 |
Super-Corrosion-Resistant 316 Stainless Steel Knurled-Head Thumb Nuts
These thumb nuts have excellent chemical resistance and can be used in saltwater environments. The head is knurled for slip-resistant controlled adjustment and the collar raises the head to make it easy to grip. They may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Collar | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size | Dia. | Ht. | Head Dia. | Ht. | Pkg. Qty. | Pkg. | |
316 Stainless Steel | |||||||
| 4-40 | 1/4" | 1/4" | 1/2" | 3/8" | 1 | 000000000 | 00000 |
Reinforced Plastic Knurled-Head Thumb Nuts
An aluminum insert with strong threads withstands more torque during installation. They're chemical resistant, nonconductive, and lightweight. The head is knurled for slip-resistant controlled adjustment and the collar raises the head to make it easy to grip.
For technical drawings and 3-D models, click on a part number.
Collar | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Dia. | Ht. | Head Dia. | Ht. | Temp. Range, °F | Color | Pkg. Qty. | Pkg. | |
Acetal Plastic | |||||||||
| 4-40 | 9/32" | 3/64" | 5/16" | 3/16" | 32° to 180° | Black | 10 | 000000000 | 00000 |
Hex-Head Thumb Nuts
Tighten these thumb nuts with a wrench for more torque while fastening. They have a flange that distributes the load over a large area and reduces stress where the nut meets the material surface. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Collar | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size | Dia. | Ht. | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
| 4-40 | 1/4" | 1/8" | 5/16" | 1/4" | 1 | 000000000 | 00000 |