S-91259A130 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 demanding applications
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments
- Precise component alignment ensured by the 1" shoulder length with tight diameter tolerance (-0.004" to -0.002")
- Secure installation and removal facilitated by the knurled socket head with 1/2" hex drive, preventing tool slippage
- Consistent thread engagement guaranteed by Class 3A UNC coarse threads for vibration resistance and easy assembly
- Enhanced durability through Rockwell C32 hardness alloy steel construction, resisting wear and deformation
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3 & REACH)
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish addresses critical engineering challenges in precision machinery and industrial equipment. The 1" shoulder length provides exact axial positioning for rotating components like gears and pulleys, eliminating misalignment issues that cause premature wear. The Class 3A UNC coarse threads maintain secure fastening in high-vibration environments, while the knurled socket head with 1/2" hex drive ensures tool engagement during torque-intensive operations. Ideal for precision applications requiring reliable shoulder positioning in automotive, manufacturing, and heavy equipment sectors, this fastener delivers consistent performance where dimensional accuracy and strength are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. Shoulder diameter tolerance maintained at -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification to ASTM A574 ensures consistent mechanical properties including specified tensile and shear strength values.
