S-91259A366 1 1/8"-7 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
- Superior load-bearing capacity with 140,000 psi tensile strength and Rockwell C32 hardness for reliable performance in demanding applications
- Enhanced corrosion resistance through black oxide finish, extending service life in harsh industrial environments
- Precision alignment and positioning with 1 1/2" shoulder length maintaining tight tolerances (-0.005" to 0.005")
- Secure fastening with minimal play thanks to Class 3A thread fit and UNC coarse threading for vibration resistance
- Easy installation and removal with 7/8" hex drive and knurled head for improved grip during tool operation
- Industry-standard compatibility through ASME B18.3 compliance, ensuring interchangeability and reliability
- Environmental regulation compliance with RoHS 3 and REACH standards for sustainable manufacturing practices
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers exceptional engineering value in precision machinery and heavy-duty equipment applications. The combination of high tensile strength (140,000 psi) and Rockwell C32 hardness ensures reliable performance in rotating assemblies, pivot points, and structural components where shear forces are critical. The black oxide finish provides essential corrosion protection while maintaining dimensional stability. The precisely machined 1 1/2" shoulder with tight tolerances enables accurate component alignment in automotive, aerospace, and industrial manufacturing applications, reducing assembly time and improving operational reliability. The UNC coarse threading and Class 3A thread fit maintain secure fastening even under vibration and dynamic loading conditions.
Specification Summary & Compliance
This shoulder screw features precision dimensions including 1 1/2" shoulder diameter with -0.004" to -0.002" tolerance, 1 1/2" shoulder length with -0.005" to 0.005" tolerance, and Class 3A thread fit for superior engagement. Manufactured to ASME B18.3 specifications with UNC 1 1/8"-7 threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for restricted substance control.
