S-91259A430 1/4"-20 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
- Enhanced Durability: Alloy steel construction with 140,000 psi tensile strength ensures long-term reliability in high-stress applications.
- Superior Corrosion Resistance: Black oxide finish provides excellent protection against rust and wear in harsh industrial environments.
- Precision Alignment: Class 3A thread fit and tight shoulder tolerances (±0.005") guarantee accurate positioning and reduced assembly play.
- High Torque Application: Hex socket drive with knurled head allows for secure tool grip and efficient installation in confined spaces.
- Robust Load Handling: 3 3/4" shoulder length and Rockwell C32 hardness support consistent performance under heavy mechanical loads.
- Industry Compliance: Meets ASME B18.3 standards and environmental regulations (RoHS 3, REACH) for safe, reliable use.
- Versatile Fastening: 1/4"-20 UNC coarse thread design ensures quick assembly and strong holding power in various materials.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and wear challenges in precision machinery. The black oxide finish enhances corrosion resistance, extending service life in humid or abrasive conditions. Its 3 3/4" shoulder length with minimal tolerance variation provides a stable bearing surface for rotating components, reducing eccentric motion and part wear. The Class 3A thread fit and UNC coarse thread facilitate rapid assembly while maintaining high clamp load integrity. Ideal for industrial automation, conveyor systems, and pivoting mechanisms, this screw ensures dimensional stability and reduces maintenance downtime in demanding B2B applications.
Specification Summary & Compliance
This shoulder screw maintains precise dimensional control with a Class 3A thread fit, shoulder diameter tolerance of -0.004" to -0.002", and shoulder length tolerance of ±0.005". It conforms to ASME B18.3 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use in regulated industries.
