S-91259A323 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 alignment and smooth rotation thanks to the 6" shoulder with tight diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005")
- Enhanced corrosion resistance through black oxide finish, extending service life in industrial environments
- Superior torque transmission with 5/8" hex drive and knurled head for secure tool engagement and reduced slippage
- Reliable thread engagement with Class 3A fit 7/8"-9 UNC coarse threads for quick assembly and vibration resistance
- Consistent mechanical properties from alloy steel construction with Rockwell C32 hardness for durability under stress
- Industry-standard compliance meeting ASME B18.3 specifications and environmental regulations (RoHS 3, REACH)
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering solutions where precise component alignment and high-strength fastening are paramount. The 6" precision shoulder with controlled tolerances ensures accurate positioning of moving parts in machinery, eliminating misalignment issues in industrial applications like rotating assemblies, pivoting mechanisms, and precision guides. The black oxide finish provides essential corrosion protection in harsh environments, while the coarse UNC threads and Class 3A fit enable rapid assembly with superior vibration resistance. The combination of 140,000 psi tensile strength and knurled hex drive head makes this shoulder screw ideal for heavy-duty equipment requiring both structural integrity and maintenance accessibility.
Specification Summary & Compliance
This shoulder screw features 7/8"-9 UNC coarse threads with Class 3A fit for precision threading, a 6" shoulder length with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications and compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.
