S-91259A351 1 1/8"-7 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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
- Superior corrosion protection through black oxide finish, extending service life in harsh industrial environments
- Precise component alignment with Class 3A thread fit and controlled shoulder diameter/length tolerances for accurate assembly
- Enhanced torque transmission via 7/8" hex drive and knurled head for secure gripping during installation
- Optimized for heavy-duty use with Rockwell C32 hardness alloy steel construction resisting wear and deformation
- Industry-standard compatibility meeting ASME B18.3 specifications for interchangeability and quality assurance
- Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering solutions where precision alignment and high-strength fastening are paramount. The 1 1/2" shoulder length with tight tolerances (±0.005") ensures accurate component positioning in machinery, automation systems, and rotating assemblies. The black oxide finish provides essential corrosion resistance while maintaining dimensional stability. With UNC coarse threads and Class 3A thread fit, installation is streamlined while maintaining vibration resistance in heavy equipment, manufacturing fixtures, and power transmission systems. The socket head design with 7/8" hex drive accommodates high torque requirements, making it ideal for maintenance-critical applications where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit precision. Shoulder diameter tolerance: -0.004" to -0.002"; shoulder length tolerance: -0.005" to 0.005". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread specifications: 1 1/8"-7 UNC coarse thread with right-hand orientation. Material certification includes Rockwell C32 hardness and 140,000 psi tensile strength verification.
