S-91264A140 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 strength and durability with alloy steel construction providing 140,000 psi tensile and 84,000 psi shear strength for demanding applications.
- Reliable vibration resistance through an integrated nylon pellet thread locker that maintains secure fastening from -50°F to 250°F.
- Enhanced corrosion protection with a black oxide finish, extending service life in harsh industrial environments.
- Precise assembly and fit ensured by Class 3A thread fit and UNC coarse threads for quick, accurate installation.
- Easy installation and removal with a hex socket drive and knurled head for superior grip and torque application.
- Stable shoulder alignment due to the 3/8" shoulder diameter with tight tolerances, providing accurate component positioning.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address common industrial challenges such as component misalignment, vibration-induced loosening, and corrosion. The 5/16"-18 UNC coarse threads with Class 3A fit enable rapid assembly while maintaining high precision in machinery, automotive, and heavy equipment. The nylon pellet thread locker effectively counters vibrations, reducing maintenance needs in dynamic environments. Combined with a black oxide finish, it offers enhanced resistance to wear and moisture, making it ideal for high-stress applications like pivots, axles, and guides where reliability is critical. Its robust design supports consistent performance under extreme loads, minimizing downtime.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a 3/8" shoulder diameter with tolerance of -0.004" to -0.002" and 1/2" thread length. Threads adhere to UNC coarse spacing with Class 3A fit for superior accuracy. Manufactured in compliance with ASME B18.3 and material standards per ASTM A574, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety conformity for global industrial use.
