S-91259A142 3/4"-10 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength to withstand high-stress applications without failure.
• Superior corrosion resistance and wear protection thanks to the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and secure fastening ensured by the Class 3A thread fit and 5" shoulder length with tight tolerances for minimal play.
• High durability and hardness from Rockwell C32 alloy steel, resisting deformation under heavy loads and repeated use.
• Easy installation and removal with a 1/2" hex drive and knurled head for improved grip, reducing tool slippage and assembly time.
• Reliable performance in coarse-thread applications due to the 3/4"-10 UNC right-hand thread, ideal for quick assembly in softer materials.
• Compliance with industry standards including ASME B18.3 and ASTM A574, ensuring consistent quality and safety in regulated sectors.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in heavy-duty machinery, automation, and precision equipment. The alloy steel construction, combined with a black oxide finish, provides excellent resistance to corrosion and abrasion, reducing maintenance needs in demanding environments like manufacturing and automotive assembly. The Class 3A thread fit and precise 5" shoulder length with tight tolerances ensure accurate component alignment, minimizing vibration and wear in pivoting or rotating mechanisms. Featuring a coarse UNC thread and knurled socket head, it simplifies installation in high-volume production settings, enhancing efficiency while maintaining the high tensile and shear strength required for safety-critical applications.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005". It meets ASME B18.3 and ASTM A574 specifications for consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various industrial and international markets.