S-91259A183 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
- Superior corrosion resistance with black oxide finish, extending service life in demanding industrial environments
- Exceptional thread engagement with Class 3A fit and UNC coarse threads for reliable fastening in high-vibration applications
- Enhanced durability from Rockwell C32 hardness alloy steel, maintaining structural integrity under heavy loads
- Precision alignment with 3/8" shoulder diameter and 5" shoulder length for accurate component positioning
- Secure installation with knurled socket head and hex drive, preventing tool slippage during torque application
- Industry compliance meeting ASME B18.3 standards for dimensional accuracy and performance reliability
- Environmental responsibility through RoHS 3 and REACH compliance, ensuring safe use in regulated industries
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish provides critical solutions for precision machinery and industrial equipment where alignment and durability are paramount. The 5/16"-18 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments, while the 5" shoulder length with tight diameter tolerances enables precise component positioning in assemblies. The knurled socket head design prevents cam-out during installation, maintaining torque integrity. Engineered for applications requiring shoulder screws with exceptional strength and corrosion resistance, this fastener delivers reliable performance in robotics, automation systems, and precision manufacturing equipment where dimensional accuracy and long-term reliability are essential.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and UNC thread specifications. The shoulder diameter maintains tight tolerance of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Compliant with ASME B18.3 specifications (ASTM A574), RoHS 3 (2015/863/EU), and REACH (EC 1907/2006) regulations, ensuring both dimensional precision and environmental compliance for industrial applications.
