S-94383A320 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 140,000 psi tensile strength and 84,000 psi minimum shear strength, ideal for high-stress industrial applications.
- Superior corrosion resistance thanks to the Black Oxide finish, extending service life in demanding environments.
- Precise thread engagement with Class 3A thread fit and UNC coarse threads, ensuring reliable, vibration-resistant fastening.
- Enhanced grip and torque application from the knurled socket head and 3/16" hex drive, reducing slippage during installation.
- High hardness and wear resistance with Rockwell C32 hardness, maintaining dimensional stability under load.
- Accurate shoulder positioning with tight tolerances on shoulder diameter and length, providing consistent alignment in assemblies.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The Black Oxide finish provides excellent corrosion protection, reducing maintenance needs in humid or abrasive conditions. With a Class 3A thread fit and UNC 5/16"-18 coarse threads, it offers secure, vibration-resistant fastening, preventing loosening in dynamic applications. The knurled socket head and hex drive enable efficient torque transmission, minimizing installation errors. Ideal for use in industrial assemblies such as pivots, guides, and rotating components, this shoulder screw ensures reliable performance, extended service life, and reduced downtime, making it a cost-effective solution for engineers and procurement specialists.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring consistent fit. The threads adhere to UNC standards with a Class 3A fit for high precision. It meets ASME B18.3 specifications under ASTM A574 and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, guaranteeing environmental safety and regulatory conformity for global industrial use.
