S-91264A622 3/8"-16 ASME B18.3, ASTM A574 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 shear strength for reliable performance in high-stress applications
- Secure vibration-resistant locking thanks to the integrated nylon pellet thread locker that maintains integrity from -50° to 250°F
- Precision-engineered shoulder fit with controlled diameter and length tolerances for accurate alignment and reduced assembly play
- Superior corrosion resistance through black oxide finish that protects against rust in demanding industrial environments
- Optimized drive engagement with hex socket design providing maximum torque transfer and reduced cam-out risk
- Class 3A thread fit ensuring tight tolerances and smooth assembly with standard UNC threaded components
- Enhanced durability from alloy steel construction with Rockwell C32 hardness for long service life
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish delivers critical engineering solutions for precision machinery and industrial equipment. The 1/2" shoulder diameter and 3/4" shoulder length provide exact positioning and alignment in assemblies, eliminating the need for separate spacers or bushings. The 3/8"-16 UNC coarse thread with Class 3A fit ensures rapid assembly while maintaining precision. The integrated nylon pellet thread locker prevents loosening under vibration, making these socket head shoulder screws ideal for rotating machinery, automation systems, and heavy-duty equipment where reliability is paramount. The combination of high tensile strength and controlled shoulder dimensions solves common alignment and vibration challenges in manufacturing and mechanical applications.
Specification Summary & Compliance
This shoulder screw features precision Class 3A thread fit with UNC thread standard and shoulder diameter tolerance of -0.004" to -0.002". Manufactured to ASME B18.3 specifications with material meeting ASTM A574. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across global markets.
