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About Hex Head Screws and Bolts
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Mil. Spec. High-Strength Steel Hex Head Screws
Partially Threaded
Choose these screws for their adherence to strict military standards for material and construction. Made from Grade 8 steel, they can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. The zinc yellow-chromate plating resists corrosion in wet environments. Material meets ASTM A354BD and SAE J429 specifications for quality. Dimensions meet ASME B18.2.1 specifications. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.
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. | |
Zinc Yellow-Chromate Plated Grade 8 Steel | ||||||||||
1/2"-13 | ||||||||||
| 3 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 150,000 | ASME B18.2.1, SAE J429, ASTM A354BD, MS90728-121 | 1 | 000000000 | 00000 |