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About Shoulder Screws
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Left-Hand Threaded Shoulder Screws
Tighten these shoulder screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. A standard shoulder with an undersized tolerance allows them to fit most machinery and equipment. They’re often used to guide or align components, and as an axle or pivot point.
For technical drawings and 3-D models, click on a part number.
Each | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Shoulder Lg. | Thread Size  | Thread Lg. | Head Dia. | Head Ht. | Material | Tensile Strength, psi | Drive Size | 1-4 | 5-Up | |
1/8" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/8" | 4-40 | 5/32" | 1/4" | 1/8" | 18-8 Stainless Steel | 70,000 | 5/64" | 000000000 | 00000 | 00000 |
| 3/16" | 4-40 | 5/32" | 1/4" | 1/8" | 18-8 Stainless Steel | 70,000 | 5/64" | 000000000 | 0000 | 0000 |
| 1/4" | 4-40 | 5/32" | 1/4" | 1/8" | 18-8 Stainless Steel | 70,000 | 5/64" | 000000000 | 0000 | 0000 |
| 3/8" | 4-40 | 5/32" | 1/4" | 1/8" | 18-8 Stainless Steel | 70,000 | 5/64" | 000000000 | 0000 | 0000 |
| 1/2" | 4-40 | 5/32" | 1/4" | 1/8" | 18-8 Stainless Steel | 70,000 | 5/64" | 000000000 | 0000 | 0000 |
5/32" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/8" | 6-32 | 3/16" | 9/32" | 1/8" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 3/16" | 6-32 | 3/16" | 9/32" | 1/8" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 1/4" | 6-32 | 3/16" | 9/32" | 1/8" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 3/8" | 6-32 | 3/16" | 9/32" | 1/8" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 1/2" | 6-32 | 3/16" | 9/32" | 1/8" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
3/16" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/8" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 3/16" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 1/4" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 3/8" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 1/2" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 3/4" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
| 1" | 8-32 | 3/16" | 5/16" | 5/32" | 18-8 Stainless Steel | 70,000 | 3/32" | 000000000 | 0000 | 0000 |
1/4" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/4" | 10-24 | 3/8" | 3/8" | 3/16" | 18-8 Stainless Steel | 70,000 | 1/8" | 000000000 | 0000 | 0000 |
| 3/8" | 10-24 | 3/8" | 3/8" | 3/16" | 18-8 Stainless Steel | 70,000 | 1/8" | 000000000 | 0000 | 0000 |
| 1/2" | 10-24 | 3/8" | 3/8" | 3/16" | 18-8 Stainless Steel | 70,000 | 1/8" | 000000000 | 0000 | 0000 |
| 5/8" | 10-24 | 3/8" | 3/8" | 3/16" | 18-8 Stainless Steel | 70,000 | 1/8" | 000000000 | 0000 | 0000 |
| 3/4" | 10-24 | 3/8" | 3/8" | 3/16" | 18-8 Stainless Steel | 70,000 | 1/8" | 000000000 | 0000 | 0000 |
| 1" | 10-24 | 3/8" | 3/8" | 3/16" | 18-8 Stainless Steel | 70,000 | 1/8" | 000000000 | 0000 | 0000 |
5/16" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/4" | 1/4"-20 | 7/16" | 7/16" | 7/32" | 18-8 Stainless Steel | 70,000 | 5/32" | 000000000 | 0000 | 0000 |
| 3/8" | 1/4"-20 | 7/16" | 7/16" | 7/32" | 18-8 Stainless Steel | 70,000 | 5/32" | 000000000 | 0000 | 0000 |
| 1/2" | 1/4"-20 | 7/16" | 7/16" | 7/32" | 18-8 Stainless Steel | 70,000 | 5/32" | 000000000 | 0000 | 0000 |
| 5/8" | 1/4"-20 | 7/16" | 7/16" | 7/32" | 18-8 Stainless Steel | 70,000 | 5/32" | 000000000 | 0000 | 0000 |
| 3/4" | 1/4"-20 | 7/16" | 7/16" | 7/32" | 18-8 Stainless Steel | 70,000 | 5/32" | 000000000 | 0000 | 0000 |
| 1" | 1/4"-20 | 7/16" | 7/16" | 7/32" | 18-8 Stainless Steel | 70,000 | 5/32" | 000000000 | 0000 | 0000 |
3/8" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/2" | 5/16"-18 | 1/2" | 9/16" | 1/4" | 18-8 Stainless Steel | 70,000 | 3/16" | 000000000 | 0000 | 0000 |
| 3/4" | 5/16"-18 | 1/2" | 9/16" | 1/4" | 18-8 Stainless Steel | 70,000 | 3/16" | 000000000 | 0000 | 0000 |
| 1" | 5/16"-18 | 1/2" | 9/16" | 1/4" | 18-8 Stainless Steel | 70,000 | 3/16" | 000000000 | 0000 | 0000 |
| 1 1/2" | 5/16"-18 | 1/2" | 9/16" | 1/4" | 18-8 Stainless Steel | 70,000 | 3/16" | 000000000 | 0000 | 0000 |
| 2" | 5/16"-18 | 1/2" | 9/16" | 1/4" | 18-8 Stainless Steel | 70,000 | 3/16" | 000000000 | 0000 | 0000 |
1/2" Shoulder Dia.—Standard Fit (-0.004" to -0.002" Dia. Tolerance) | ||||||||||
| 1/2" | 3/8"-16 | 5/8" | 3/4" | 5/16" | 18-8 Stainless Steel | 70,000 | 1/4" | 000000000 | 0000 | 0000 |
| 3/4" | 3/8"-16 | 5/8" | 3/4" | 5/16" | 18-8 Stainless Steel | 70,000 | 1/4" | 000000000 | 0000 | 0000 |
| 1" | 3/8"-16 | 5/8" | 3/4" | 5/16" | 18-8 Stainless Steel | 70,000 | 1/4" | 000000000 | 0000 | 0000 |
| 1 1/2" | 3/8"-16 | 5/8" | 3/4" | 5/16" | 18-8 Stainless Steel | 70,000 | 1/4" | 000000000 | 0000 | 0000 |
| 2" | 3/8"-16 | 5/8" | 3/4" | 5/16" | 18-8 Stainless Steel | 70,000 | 1/4" | 000000000 | 00000 | 0000 |