S-91259A615 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 strength and durability with alloy steel construction and Rockwell C32 hardness, ensuring reliable performance under high-stress conditions.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Precise thread engagement with Class 3A UNC coarse threads, providing secure, vibration-resistant fastening in machinery applications.
- Easy installation and removal thanks to the hex socket drive and knurled head, allowing for efficient tool grip and reduced assembly time.
- Accurate shoulder positioning with tight diameter and length tolerances, ensuring consistent alignment in precision assemblies.
- High load-bearing capacity with 140,000 psi tensile and 84,000 psi shear strength, ideal for demanding mechanical fastening.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment, where misalignment and component wear are common issues. The alloy steel material and black oxide finish provide excellent resistance to corrosion and abrasion, reducing maintenance needs in environments like automotive assemblies or manufacturing tools. The UNC coarse thread and Class 3A fit ensure quick, secure fastening with minimal risk of loosening under vibration, while the knurled socket head enhances grip for efficient installation. With a robust shoulder diameter and precise tolerances, it offers reliable pivoting and spacing in applications such as rotating shafts, linkages, and bearing supports, delivering long-term performance and reducing downtime in B2B settings.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a 5/16"-18 UNC thread with Class 3A fit for accurate engagement, a shoulder diameter of 3/8" with tight tolerance, and a thread length of 1/2". It complies with ASME B18.3 specifications for consistency and reliability, and meets RoHS 3 and REACH regulations for environmental safety, ensuring it is free from hazardous substances and suitable for global industrial use.
