S-91259A416 8-32 ASME B18.3, ASTM A574 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 shear strength for reliable performance in demanding applications
- Superior corrosion resistance through black oxide finish, extending service life in harsh industrial environments
- Precision Class 3A thread fit ensures secure fastening with minimal backlash in critical assemblies
- Alloy steel construction with Rockwell C32 hardness provides excellent durability and wear resistance
- Standard hex drive design allows for easy installation and removal with common tools
- Right-hand UNC coarse threads deliver quick assembly and disassembly while maintaining holding power
- Comprehensive regulatory compliance meets ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish addresses critical engineering challenges in precision machinery, automation systems, and industrial equipment. The 8-32 UNC thread with Class 3A fit provides exceptional dimensional accuracy for applications requiring precise alignment and minimal clearance. The 3/16" thread length and standardized shoulder dimensions ensure consistent performance in jigs, fixtures, and rotating assemblies. The socket head design with hex drive facilitates installation in confined spaces while the 140,000 psi tensile strength withstands high dynamic loads. These shoulder screws are engineered to prevent component misalignment and reduce wear in pivot points, bearing mounts, and linkage systems, making them ideal for OEM and MRO applications where reliability and precision are paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 standards with Class 3A thread fit for superior dimensional accuracy. The alloy steel composition meets ASTM A574 specifications, heat-treated to Rockwell C32 hardness. Features precision-machined shoulders with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
