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About Hex Head Screws and Bolts
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High-Strength Steel Hex Head Screws with Phillips Drive
When clearance for a wrench is limited, these screws have a Phillips drive so you can install them with a screwdriver. With a tensile strength of 160,000 psi, they are stronger than Grade 8 screws and can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. The cadmium plating provides good corrosion resistance to salt water. Screws meet NAS (National Aerospace Standards) specifications for material and construction. Length is measured from under the head.
Match the thread spacing of mating components. Fine threads are closely spaced to prevent loosening from vibration.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel | |||||||||||
1/4"-28 | |||||||||||
| 1" | Partially Threaded | 15/16" | Fine | 3/8" | 1/4" | No. 3 | 160,000 | NAS1801-4-16 | 1 | 000000000 | 000000 |