S-91259A313 7/8"-9 ASME B18.3 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 and 84,000 psi minimum shear strength for reliable performance in demanding applications
- Precision shoulder alignment with 1 1/4" shoulder diameter and 3" shoulder length ensuring accurate component positioning
- Superior corrosion resistance through black oxide finish that protects against environmental degradation
- High-strength alloy steel construction with Rockwell C32 hardness providing excellent durability and wear resistance
- Precise thread engagement with Class 3A thread fit ensuring secure fastening in critical assemblies
- Easy installation and removal with 5/8" hex drive socket head design for efficient maintenance access
- Industry-standard compliance meeting ASME B18.3 specifications and RoHS/REACH environmental regulations
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish delivers critical engineering solutions for industrial applications requiring precise alignment and high strength. The 7/8"-9 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments, while the precisely machined shoulder provides accurate component positioning in machinery, automation systems, and heavy equipment. The socket head design with hex drive allows for easy installation in confined spaces, making it ideal for assembly lines and maintenance operations. With 140,000 psi tensile strength and corrosion-resistant finish, this shoulder screw maintains integrity in demanding conditions where precision and reliability are paramount for operational efficiency and safety.
Specification Summary & Compliance
This precision shoulder screw features Class 3A thread fit with 7/8"-9 UNC coarse thread and tight tolerances including shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The component maintains dimensional accuracy and performance consistency across industrial applications.
