S-91259A638 5/16"-18 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 demanding applications.
- Precision Class 3A thread fit ensures tight, secure fastening and reduces the risk of loosening under vibration or dynamic loads.
- Enhanced corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Rockwell C32 hardness provides excellent wear resistance and durability, maintaining dimensional stability under stress.
- Knurled socket head offers improved grip for easier installation and removal with standard hex tools, reducing assembly time.
- Accurate shoulder dimensions with tight tolerances for precise alignment in machinery and rotational assemblies.
- Compliance with ASME B18.3 and environmental standards including RoHS 3 and REACH, ensuring quality and regulatory safety.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in industrial settings, such as maintaining alignment in rotating components and withstanding high-stress conditions. The alloy steel construction, combined with a black oxide finish, provides superior resistance to corrosion and wear, making it ideal for machinery, automotive, and aerospace applications. The UNC coarse threads and Class 3A fit ensure quick assembly and reliable holding power, reducing downtime in production lines. Its 3 1/2" shoulder length allows for precise positioning in assemblies, while the socket head design with hex drive facilitates easy installation in confined spaces, enhancing efficiency for B2B procurement needs.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with UNC coarse threads, ensuring high precision and interchangeability. Dimensions include a shoulder diameter of 3/8" with tight tolerances (-0.004" to -0.002") and shoulder length of 3 1/2" (±0.005"). It complies with ASME B18.3 specifications, ASTM A574 material standards, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements for environmental safety.
