S-91264A210 3/4"-10 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon pellet thread locker maintains secure fastening in temperatures from -50° to 250°F, preventing loosening in high-stress environments.
• Exceptional load capacity: Made from high-grade alloy steel with 140,000 psi tensile strength and 84,000 psi shear strength for demanding industrial applications.
• Precise alignment and rotation: Knurled socket head and 1/2" hex drive provide superior grip and torque transmission, reducing tool slippage during installation.
• Reliable thread engagement: Class 3A UNC coarse threads ensure consistent, tight fits with reduced cross-threading risk in assembly operations.
• Corrosion-resistant durability: Black oxide finish protects against rust and wear, extending service life in harsh operating conditions.
• Accurate component positioning: 1" shoulder diameter with tight tolerances (±0.005") guarantees precise part alignment and spacing in machinery.
• Industry-standard compliance: Manufactured to ASME B18.3 specifications with RoHS 3 and REACH compliance for global regulatory acceptance.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in heavy-duty assembly, where vibration-induced loosening and misalignment can compromise machinery integrity. The 3/4"-10 UNC coarse thread with Class 3A fit delivers reliable engagement in high-load scenarios, while the integrated nylon pellet thread locker secures joints across a wide temperature range (-50° to 250°F). The black oxide finish enhances corrosion resistance, making it ideal for automotive, aerospace, and industrial equipment where exposure to oils and moisture is common. The knurled socket head with 1/2" hex drive ensures efficient torque application, reducing installation time and improving worker safety in confined spaces.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance (-0.004" to -0.002") and length tolerance (±0.005"). It conforms to ASME B18.3 manufacturing specifications under ASTM A574 and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial supply chains.