S-91274A280 5/16"-18 x 3 1/4" ASME B18.3, ASTM A574, ASTM B117 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 provides reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating ensures long-term durability in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit offers tighter tolerances for secure, vibration-resistant assemblies, enhancing joint integrity.
- High hardness (Rockwell C37) increases wear resistance, extending the screw's service life under repetitive loads.
- 1/4" hex drive design allows for easy installation and removal with standard tools, improving assembly efficiency.
- Partially threaded shank provides optimal grip and alignment in fastened materials, preventing loosening.
- Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability, ensuring reliable sourcing for B2B buyers.
Professional Applications & Engineering Value
This Socket Head Cap Screw is engineered to address critical challenges in demanding industrial settings. The zinc-flake-coated alloy steel construction delivers robust corrosion resistance, ideal for machinery exposed to moisture or chemicals. With a 5/16"-18 UNC coarse thread and Class 3A fit, it ensures rapid assembly and secure fastening in high-vibration applications like automotive systems, heavy equipment, and aerospace components. The partially threaded design concentrates clamping force precisely, reducing stress concentration and improving fatigue resistance. Its 170,000 psi tensile strength and Rockwell C37 hardness make it suitable for structural applications where reliability is paramount, supporting efficient maintenance and reducing downtime in B2B operations.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNC standards, ensuring precise dimensional accuracy. It meets ASME B18.3 and ASTM A574 specifications for manufacturing consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it supports environmentally responsible sourcing. The product also conforms to ASTM B117 for corrosion testing, guaranteeing performance in industrial environments.
