S-91259A731 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
- Enhanced Durability and Corrosion Resistance with black oxide finish, ideal for harsh industrial environments
- Superior Tensile and Shear Strength (140,000 psi tensile, 84,000 psi shear) ensures reliable performance in high-stress applications
- Precise Thread Fit and Stability with Class 3A UNC coarse threads for secure fastening and vibration resistance
- Accurate Shoulder Alignment with tight diameter and length tolerances for consistent positioning in assemblies
- Easy Installation and Removal thanks to the socket hex drive and knurled head for improved grip
- Compliance with Industry Standards including ASME B18.3, RoHS, and REACH for quality and environmental safety
- Robust Material Performance from alloy steel with Rockwell C32 hardness for long-term wear resistance
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery and industrial equipment. Made from alloy steel with a black oxide finish, it offers excellent corrosion resistance and durability, reducing maintenance needs in demanding environments. The Class 3A thread fit and coarse UNC threading provide secure fastening, minimizing loosening under vibration, while the precisely machined shoulder ensures accurate component positioning in assemblies like rotating shafts, gears, and linkages. Its socket head design with hex drive allows for easy installation in confined spaces, making it ideal for precision assemblies and heavy-duty applications where reliability is paramount.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threads, ensuring high precision and interchangeability. Dimensions include a shoulder diameter of 1/2" with tight tolerances (-0.004" to -0.002") and shoulder length of 4 3/4" (±0.005"). It complies with ASME B18.3 specifications and is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, providing assurance of quality and regulatory adherence for industrial use.
