S-91259A443 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 load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications.
- Precision-machined Class 3A thread fit ensures secure, vibration-resistant fastening with minimal risk of loosening.
- Enhanced corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Rockwell C32 hardness provides superior wear resistance and durability under repetitive stress.
- Knurled socket head design offers improved grip and easier installation with standard hex tools.
- Tight shoulder tolerances (-0.004" to -0.002" diameter, -0.005" to 0.005" length) guarantee precise alignment in assemblies.
- Full compliance with ASME B18.3 and ASTM A574 ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and high-stress challenges in industrial machinery, automation systems, and heavy equipment. The 1/2"-13 UNC coarse thread with Class 3A fit provides rapid assembly and robust clamping force, while the precisely machined shoulder diameter and length act as a pivot or spacer, eliminating misalignment in rotating parts. The black oxide finish not only resists corrosion but also reduces galling during installation. With a knurled socket head for non-slip tool engagement, it ensures reliable fastening in high-vibration environments, making it ideal for precision engineering applications where dimensional accuracy and strength are paramount.
Specification Summary & Compliance
This shoulder screw features a 1/2"-13 UNC coarse thread with Class 3A thread fit and tight shoulder tolerances (diameter: -0.004" to -0.002", length: -0.005" to 0.005"). Manufactured in accordance with ASME B18.3 and ASTM A574 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe and sustainable use across global industries.
