S-91259A140 3/4"-10 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 shear strength for reliable performance in high-stress applications.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Precision alignment and reduced wear thanks to the 1" shoulder diameter with tight tolerances for accurate component positioning.
- High thread reliability with Class 3A UNC coarse threads ensuring secure, vibration-resistant fastening.
- Enhanced grip and easy installation provided by the knurled socket head and 1/2" hex drive, reducing slippage during assembly.
- Durable, hardened construction from Rockwell C32 alloy steel for long-term durability and resistance to deformation.
- Compliance with industry standards including ASME B18.3 and ASTM A574, ensuring consistent quality and safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty industrial equipment. The Class 3A UNC coarse threads and 1" shoulder diameter with tight tolerances provide exact alignment, minimizing misalignment and wear in rotating assemblies like bearings, pulleys, and gears. The black oxide finish enhances corrosion resistance, making it suitable for environments exposed to moisture or chemicals. With 140,000 psi tensile strength and Rockwell C32 hardness, it withstands high dynamic loads and impacts, reducing maintenance needs and downtime in applications such as automotive systems, conveyor mechanisms, and robotic arms.
Specification Summary & Compliance
This shoulder screw features 3/4"-10 UNC Class 3A threads with coarse spacing, ensuring precise fit and high reliability. Dimensions include a shoulder diameter of 1" with tolerance of -0.004" to -0.002" and shoulder length of 3 1/2" with tolerance of -0.005" to 0.005". It meets ASME B18.3 and ASTM A574 specifications, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
