S-90344A120 5/16"-18 x 1 1/2" ASME B18.3, ASTM A574 Socket Head Screws with Flat Washer
Socket Head Screws with Flat Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
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.
- Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
- Integrated flat washer distributes load evenly, preventing surface damage and maintaining joint integrity under heavy loads.
- High Rockwell C39 hardness offers excellent wear resistance, ideal for repetitive assembly and disassembly cycles.
- Standard hex drive design allows for easy installation with common tools, streamlining maintenance and reducing downtime.
- Full threading ensures consistent engagement along the entire length, providing versatile fastening solutions for various material thicknesses.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical industrial challenges, such as vibration-induced loosening and corrosion in harsh operating conditions. The UNC coarse thread design facilitates quick assembly in soft materials or where rapid installation is essential, while the Class 3A thread fit guarantees tight tolerances for precision machinery and automotive applications. Combined with a flat washer, it effectively distributes clamping force, reducing stress concentrations on connected surfaces. Ideal for heavy-duty equipment, manufacturing fixtures, and structural assemblies, this fastener delivers reliable performance where high tensile strength and durability are paramount, ensuring long-term operational safety and efficiency.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 UNC thread with Class 3A fit for precise engagement, and a length of 1-1/2" with full threading. It meets ASME B18.3 specifications for dimensional accuracy and is manufactured from alloy steel with a black-oxide finish. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.
