S-91259A304 7/8"-9 ASME B18.3 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 shear strength for reliable performance in high-stress applications
- Superior corrosion resistance thanks to the black oxide finish, extending service life in demanding industrial environments
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced grip and torque application through the knurled socket head with 5/8" hex drive for easy installation
- Accurate positioning and alignment provided by the precisely machined shoulder with tight diameter and length tolerances
- Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interchangeability and quality
- Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering value in applications requiring precise component alignment and high mechanical strength. The black oxide finish provides essential corrosion protection in industrial environments where moisture and chemicals are present, while the Rockwell C32 hardness ensures excellent wear resistance. The 7/8"-9 UNC coarse threads with Class 3A fit offer superior vibration resistance in machinery, automotive assemblies, and heavy equipment. The combination of high tensile strength and precisely controlled shoulder dimensions makes this fastener ideal for pivot points, rotating assemblies, and precision guiding applications where dimensional accuracy is paramount for proper function and longevity.
Specification Summary & Compliance
This shoulder screw features precision Class 3A thread fit with UNC coarse threading standards. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The shoulder maintains tight tolerances with diameter between -0.004" to -0.002" and length between -0.005" to 0.005". The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for industrial applications.
