S-94383A340 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 load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precise thread engagement with Class 3A thread fit ensuring secure, vibration-resistant fastening in critical assemblies.
- Enhanced grip and torque application from the knurled socket head and 3/16" hex drive, reducing slippage during installation.
- High durability and wear resistance due to Rockwell C32 hardness, maintaining dimensional stability under repeated use.
- Wide compatibility and standardization with UNC coarse threads and compliance to ASME B18.3 and ASTM A574 for consistent quality.
- Environmentally responsible manufacturing meeting RoHS 3 and REACH regulations, ensuring safe use in global markets.
Professional Applications & Engineering Value
This alloy steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The 5/16"-18 UNC coarse thread and Class 3A thread fit provide excellent vibration resistance and ease of assembly in automated systems, while the knurled socket head allows for high-torque installation without tool slippage. Ideal for precision applications like machinery mounts, pivots, and rotating assemblies, it ensures reliable shoulder mounting with consistent shoulder diameter and length tolerances, reducing downtime and maintenance costs in sectors such as automotive, aerospace, and heavy equipment manufacturing.
Specification Summary & Compliance
This shoulder screw features precise dimensions including a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002" and shoulder length of 5/8" with tolerance of -0.005" to 0.005". It adheres to Class 3A thread fit for high accuracy and meets ASME B18.3 and ASTM A574 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for international industrial use.
