S-91251A892 7/8"-9 x 5" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
- Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
- 3/4" hex drive socket head allows for high-torque installation with standard tools, improving assembly efficiency and reducing stripping.
- Partially threaded design with 2 1/4" minimum thread length provides optimal grip and alignment in varied material thicknesses.
- Rockwell C37 hardness ensures durability and wear resistance, maintaining integrity under repeated loads.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as joint loosening and corrosion in heavy machinery. The UNRC coarse thread and Class 3A fit ensure quick, secure fastening with minimal cross-threading, ideal for high-vibration environments like automotive and construction equipment. The alloy steel construction with 170,000 psi tensile strength provides robust load-bearing capacity, while the black-oxide surface treatment resists rust and wear, reducing maintenance costs. Suitable for partially threaded applications in frames and fixtures, it delivers reliable performance where precision and durability are critical.
Specification Summary & Compliance
This screw features a 7/8"-9 coarse UNRC thread with Class 3A precision for tight tolerances and a 5" length with partial threading. It meets ASTM A574 specifications for high-strength alloy steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and material consistency in industrial use.
