S-91259A373 1 1/8"-7 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in demanding applications
• Precision shoulder alignment with tight diameter tolerance (-0.004" to -0.002") ensures accurate component positioning and reduces assembly time
• Superior corrosion resistance through black oxide finish extends service life in harsh industrial environments
• Enhanced grip and handling with knurled head texture prevents slipping during installation and removal
• High-strength alloy steel construction with Rockwell C32 hardness provides excellent durability and wear resistance
• Precise Class 3A thread fit ensures secure fastening with minimal play in critical assemblies
• Industry-standard compliance with ASME B18.3 specifications guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers exceptional engineering value in precision machinery and heavy-duty equipment applications. The 5" shoulder length with tight diameter tolerance (-0.004" to -0.002") provides precise bearing surfaces for rotating components, eliminating the need for additional spacers and reducing assembly complexity. The 1 1/8"-7 UNC coarse thread with Class 3A fit ensures rapid installation while maintaining vibration resistance in high-stress environments. The black oxide finish offers superior corrosion protection, extending service life in manufacturing, automation, and industrial equipment. With 140,000 psi tensile strength and Rockwell C32 hardness, this socket head shoulder screw withstands extreme mechanical loads while the 7/8" hex drive and knurled head facilitate secure tool engagement during high-torque applications.

Specification Summary & Compliance

This precision shoulder screw features 1 1/8"-7 UNC coarse threads with Class 3A thread fit and maintains tight shoulder diameter tolerance of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications for dimensional consistency and performance reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.