S-91259A433 5/16"-18 ASME B18.3, ASTM A108 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 – Withstands up to 140,000 psi loads for reliable performance in high-stress industrial applications.
- Precision Shoulder Fit – Tight ±0.005" length tolerance ensures accurate alignment and reduced vibration in assemblies.
- Corrosion-Resistant Black Oxide Finish – Extends service life by protecting against rust and wear in harsh environments.
- Class 3A Thread Fit – Provides superior thread engagement and consistent fastening with minimal backlash.
- Knurled Socket Head Design – Enhances grip during installation and allows easy torque application with standard hex tools.
- High Hardness (Rockwell C32) – Resists deformation and maintains dimensional stability under repeated use.
- Industry Standard Compliance – Meets ASME B18.3, RoHS 3, and REACH for guaranteed quality and environmental safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw with 5/16"-18 UNC coarse thread and black oxide finish is engineered to solve critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 4-1/4" shoulder length with minimal tolerance variation acts as a precise pivot or spacer, reducing component wear and simplifying assembly. Its Class 3A thread fit and 140,000 psi tensile strength ensure secure fastening in dynamic applications where vibration resistance is essential. Ideal for use in jigs, fixtures, and rotating assemblies, this socket head shoulder screw delivers long-term reliability and compliance with global standards.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A fit and a shoulder diameter tolerance of -0.004" to -0.002". Manufactured to ASME B18.3 specifications using ASTM A108 alloy steel, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use across industries.
