S-91259A459 2-56 ASTM A108 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 for reliable performance in high-stress applications
- Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Superior corrosion protection through black oxide finish extending service life in demanding environments
- Enhanced durability from Rockwell C32 hardness maintaining structural integrity under repeated use
- Optimized drive efficiency with 5/64" hex socket and knurled head for secure tool grip and torque transmission
- Accurate shoulder positioning with controlled diameter and length tolerances for precise component alignment
- Broad industrial compliance meeting ASTM A108, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
This alloy steel shoulder screw with 2-56 UNC coarse thread and black oxide finish addresses critical engineering challenges in precision assemblies. The Class 3A thread fit provides superior vibration resistance in rotating machinery, while the precisely machined shoulder maintains accurate component alignment in jigs, fixtures, and bearing assemblies. The 140,000 psi tensile strength and Rockwell C32 hardness ensure reliable performance in automotive, aerospace, and industrial equipment where heavy-duty fastening is required. The corrosion-resistant black oxide surface treatment extends service life in environments exposed to moisture and chemicals, making these socket head shoulder screws ideal for manufacturing equipment, robotics, and precision instrumentation applications.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and controlled shoulder diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005"). Thread specifications conform to UNC coarse thread standards with 2-56 size and right-hand direction. Compliant with ASTM A108 material specifications, RoHS 3 (2015/863/EU) for restricted substances, and REACH (EC 1907/2006) regulations for chemical safety, ensuring quality and environmental compliance for industrial applications.
