S-91259A439 1/2"-13 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 strength and durability with 140,000 psi tensile strength and Rockwell C32 hardness, ensuring reliable performance in high-stress applications.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Precise fit and alignment with Class 3A thread fit and standard shoulder fit, reducing assembly errors and improving mechanical stability.
- Easy installation and removal thanks to the hex socket drive and knurled head, providing a secure grip and reducing tool slippage.
- Wide compatibility with UNC coarse threading and right-hand thread direction, making it suitable for various machinery and equipment.
- High shear resistance with a minimum shear strength of 84,000 psi, ideal for applications subject to lateral forces.
- Compliance with industry standards including ASME B18.3 and ASTM A574, ensuring consistent quality and reliability.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and component wear. The black oxide finish provides enhanced corrosion resistance, making it suitable for environments exposed to moisture or chemicals. With a 1/2"-13 UNC coarse thread and Class 3A fit, it ensures tight, secure fastening in heavy-duty applications like machinery assemblies, automotive systems, and precision equipment. The knurled head and hex drive facilitate easy installation, reducing assembly time and improving workflow efficiency. Its high tensile and shear strength supports demanding operations, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a thread diameter of 0.5" with Class 3A fit and UNC coarse threading per ASME standards. Shoulder diameter and length tolerances are tightly controlled for accurate alignment. It meets ASME B18.3 and ASTM A574 specifications, ensuring high manufacturing quality. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in industrial use.
