S-91259A164 8-32 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 of 140,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure
- Superior corrosion resistance from the black oxide finish extends service life in demanding industrial environments
- Precision Class 3A thread fit guarantees secure, vibration-resistant connections with minimal backlash
- High shear strength (84,000 psi minimum) provides excellent resistance to lateral forces in dynamic applications
- Socket head design with hex drive allows for easy installation in confined spaces while maintaining high torque capability
- Consistent dimensional accuracy with controlled shoulder tolerances ensures perfect alignment in precision assemblies
- Comprehensive compliance with ASTM A574, RoHS 3, and REACH standards ensures material quality and environmental responsibility
Professional Applications & Engineering Value
These alloy steel shoulder screws with 8-32 UNC coarse thread and black oxide finish are engineered to solve critical alignment and durability challenges in precision machinery. The 3/16" shoulder length provides precise component spacing and rotational stability in assemblies requiring exact positioning, while the Class 3A thread fit eliminates play in high-vibration environments. The socket head design with 3/32" hex drive facilitates installation in tight spaces common in industrial equipment, robotics, and automation systems. The combination of 140,000 psi tensile strength and Rockwell C32 hardness ensures these shoulder screws maintain dimensional stability under continuous mechanical stress, making them ideal for pivots, axles, and guide pins in manufacturing applications.
Specification Summary & Compliance
These shoulder screws feature precision 8-32 UNC coarse threads with Class 3A fit for superior engagement and vibration resistance. The shoulder diameter maintains tight tolerances (-0.004" to -0.002") with shoulder length controlled to ±0.005" for consistent alignment. Manufactured to ASTM A574 specification for socket head cap screws, these components are fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international standards for material quality and environmental safety in industrial applications.
