Description
Upgrade your toolkit with confidence using the Grade 8 Hex Head Cap Screw—a high-strength, reliable fastener that meets both professional and industrial standards. Crafted from premium steel and finished in sleek black oxide for semi-dry environments, this 8‑inch long, partially threaded fastener is engineered for demanding applications.
Backed by SAE J429 quality and ASME B18.2.1 dimensional accuracy, this Grade 8 screw delivers an impressive tensile strength of 150,000 psi and a hardness rating of HRC 33, making it ideal for safety-critical assemblies, heavy-duty machinery, and construction applications.
Key Features
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Grade 8 Alloy Steel Construction – Offers superior tensile strength (150,000 psi) and hardness (HRC 33) for heavy-duty performance.
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5/16″‑18 UNC Thread, 8″ Length – Coarse thread and partial threading accommodate diverse fastening needs with an overall head-turning length.
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External Hex Head (½″ Across Flats) – Easy, tool-friendly design for quick installation and removal, ideal for wrenches and impact tools.
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Black Oxide Finish – Provides mild corrosion resistance and a low-reflective, professional appearance.
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Standards-Compliant – Meets SAE J429 and ASME B18.2.1 for material strength and dimensional precision.
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5‑Pack Convenient Packaging – Perfect for small project kits, repairs on the go, or stocking job boxes.
Technical Specifications
| Attribute | Value |
|---|---|
| Thread Size | 5/16″-18 UNC (Coarse) |
| Fastener Length | 8 inches |
| Thread Style | Partially Threaded |
| Minimum Thread Length | 7/8 inch |
| Thread Fit | 2A |
| Thread Direction | Right-Hand |
| Head Type | Hex |
| Drive Type | External Hex |
| Head Width (Across Flats) | 1/2 inch |
| Head Height | 13/64 inch |
| Material Grade | Grade 8 |
| Material | Steel |
| Finish | Black Oxide |
| Tensile Strength | 150,000 psi |
| Hardness | HRC 33 |
| Standards | SAE J429, ASME B18.2.1 |
| Units per Pack | 5 |
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