S-91259A468 8-32 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: Withstands up to 140,000 psi for reliable performance in high-stress applications, reducing the risk of fastener failure.
- Precision Thread Fit: Class 3A UNC coarse threads ensure tight, secure connections with minimal backlash, enhancing assembly accuracy.
- Corrosion-Resistant Finish: Black Oxide coating provides durable protection against rust and wear, extending service life in harsh environments.
- Secure Grip Design: Knurled socket head with hex drive prevents slipping during installation, allowing for consistent torque application.
- Accurate Shoulder Alignment: 1-1/4" shoulder length with tight tolerances maintains precise component positioning in machinery and fixtures.
- High Material Hardness: Rockwell C32 alloy steel construction offers superior durability and resistance to deformation under load.
- Broad Compliance: Meets ASME B18.3 standards and environmental regulations (RoHS 3, REACH) for safe, reliable use across industries.
Professional Applications & Engineering Value
This 8-32 UNC thread shoulder screw is engineered to address critical alignment and strength requirements in industrial assemblies. The alloy steel core, combined with a Black Oxide finish, resists corrosion and wear in demanding environments like automotive jigs, robotics, and precision machinery. Its 1-1/4" shoulder length with minimal tolerances ensures exact component spacing, reducing vibration and misalignment issues. The Class 3A thread fit and coarse UNC threading provide quick, secure fastening, while the knurled socket head allows for efficient installation with standard hex tools. Ideal for applications requiring repeatable accuracy and high tensile strength, this screw delivers long-term reliability in OEM and MRO settings.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with Class 3A thread fit for precise UNC coarse threading (8-32 size). The shoulder diameter tolerance ranges from -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for consistent performance. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and material integrity.
