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About Hex Head Screws and Bolts
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Brass Hex Head Screws
Fully Threaded
Partially Threaded
Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance. Length is measured from under the head.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration.
Screws that meet ASME B18.2.1 comply with specifications for dimensional standards.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
1/4"-20 | ||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 25 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 25 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 25 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 25 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
| 3" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
1/4"-28 | ||||||||||
| 1/2" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
5/16"-18 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 3" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 00000 |
3/8"-16 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 10 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 50,000 | ASME B18.2.1 | 1 | 000000000 | 0000 |
7/16"-14 | ||||||||||
| 1" | Fully Threaded | __ | Coarse | 5/8" | 9/32" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 5/8" | 9/32" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 1 1/8" | Coarse | 5/8" | 9/32" | 50,000 | ASME B18.2.1 | 1 | 000000000 | 0000 |
1/2"-13 | ||||||||||
| 3/4" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 50,000 | ASME B18.2.1 | 5 | 000000000 | 0000 |