S-91259A628 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 minimum shear strength for reliable performance in high-stress applications
- Superior corrosion resistance through black oxide finish, extending service life in demanding industrial environments
- Precision dimensional stability with Class 3A thread fit ensuring consistent mating and reduced assembly issues
- Enhanced grip and torque application with knurled socket head and 3/16" hex drive for secure fastening operations
- Optimized for heavy-duty use featuring Rockwell C32 hardness for excellent wear resistance and durability
- Reliable shoulder positioning with 1 1/2" shoulder length providing accurate component spacing and alignment
- Industry-standard compliance meeting ASME B18.3 specifications and manufactured to ASTM A574 standards
Professional Applications & Engineering Value
This alloy steel shoulder screw with 5/16"-18 UNC coarse threads and black oxide finish delivers critical engineering solutions for precision machinery, automation systems, and heavy equipment. The 1 1/2" shoulder length provides exact component spacing in rotating assemblies, jigs, and fixtures, while the Class 3A thread fit ensures vibration-resistant connections in high-cycle applications. The knurled socket head with 3/16" hex drive facilitates secure installation in confined spaces, making it ideal for manufacturing equipment, automotive assemblies, and industrial robotics where dimensional accuracy and high shear strength are paramount for operational reliability.
Specification Summary & Compliance
Manufactured to precise inch measurement system standards with Class 3A thread fit and UNC coarse threading. The shoulder features standard fit with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Compliant with ASME B18.3 specifications and manufactured to ASTM A574 standards. Meets environmental regulations including RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant for global industrial use.
