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About Hex Head Screws and Bolts
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Ultra-High-Temperature Molybdenum Hex Head Screws
Fully Threaded
Partially Threaded
In oxygen-free environments, such as vacuum furnaces, these molybdenum screws can handle blistering temperatures up to 2900° F. They’re thermally conductive, so heat passes through quickly without deforming them. They’re stronger than ceramic screws, which can handle similar extreme temperatures. However, they will corrode if they’re exposed to oxygen at temperatures above 1100° F. These screws are nonmagnetic. To ensure compatibility in high-temperature applications, use them with molybdenum nuts (sold separately) and washers. All screws meet ASTM standards for material quality and ASME or DIN standards for dimensions. Length is measured from under the head.
Screws | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Head | Nuts | |||||||||||||
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Maximum Temperature, °F | Maximum Temperature in a Vacuum,°F | Tensile Strength, psi | Specifications Met | Each | Pkg. Qty. | Pkg. | ||
1/4"-20 | ||||||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 0000 |
3/8"-16 | ||||||||||||||
| 1" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
1/2"-13 | ||||||||||||||
| 1" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 1100° | 2900° | 85,000 | ASME B18.2.1, ASTM B387 | 000000000 | 000000 | 1 | 000000000 | 00000 |
M6 × 1mm | ||||||||||||||
| 15mm | Fully Threaded | __ | Coarse | 10mm | 4mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 20mm | Fully Threaded | __ | Coarse | 10mm | 4mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 25mm | Fully Threaded | __ | Coarse | 10mm | 4mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 30mm | Partially Threaded | 18mm | Coarse | 10mm | 4mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 931 | 000000000 | 00000 | 1 | 000000000 | 00000 |
M8 × 1.25mm | ||||||||||||||
| 15mm | Fully Threaded | __ | Coarse | 13mm | 5.3mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 20mm | Fully Threaded | __ | Coarse | 13mm | 5.3mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 25mm | Fully Threaded | __ | Coarse | 13mm | 5.3mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 30mm | Fully Threaded | __ | Coarse | 13mm | 5.3mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 933 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 35mm | Partially Threaded | 22mm | Coarse | 13mm | 5.3mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 931 | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 40mm | Partially Threaded | 22mm | Coarse | 13mm | 5.3mm | 1100° | 2900° | 85,000 | ASTM B387, DIN 931 | 000000000 | 00000 | 1 | 000000000 | 00000 |