S-91259A481 5/16"-18 ASME B18.3, ASTM A574 Shoulder Screws
Shoulder 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 140,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black oxide finish prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly stability and reducing loosening over time.
- Knurled socket head design provides improved grip during installation, allowing for easier torque application and reducing tool slippage.
- High hardness (Rockwell C32) offers excellent wear resistance, maintaining dimensional accuracy and durability through repeated use.
- Coarse UNC threading enables quick and easy installation, speeding up assembly processes in time-sensitive applications.
- Compliance with ASME B18.3 and environmental standards ensures consistent quality and safe use across regulated industries.
Professional Applications & Engineering Value
This alloy steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as component misalignment and corrosion-induced failure. The 5/16"-18 UNC coarse thread and Class 3A thread fit provide tight, reliable fastening in machinery, automotive, and aerospace assemblies, where vibration resistance is critical. The knurled socket head allows for secure tool engagement, reducing installation errors. Ideal for precision shoulder bolt applications, it ensures accurate positioning of moving parts, enhancing overall system longevity and reducing downtime in demanding environments.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with precise shoulder diameter and length tolerances, manufactured to ASME B18.3 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material consistency for industrial use.
