S-91259A490 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
- Exceptional durability with alloy steel construction and 140,000 psi tensile strength for reliable performance in high-stress applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precise component alignment enabled by the 1/2" shoulder diameter and 1 5/8" shoulder length with tight tolerances.
- High thread reliability with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance.
- Easy installation and removal using the 1/4" hex drive and knurled head for improved grip and torque application.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety.
- Consistent performance backed by Rockwell C32 hardness and standard shoulder fit for repeatable accuracy.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery, automation systems, and assembly fixtures. The alloy steel material, combined with the black oxide finish, provides excellent strength and corrosion resistance, reducing maintenance needs in demanding conditions. The UNC coarse threads and Class 3A fit ensure quick, secure fastening with minimal risk of loosening under vibration. Ideal for applications requiring exact positioning, such as in rotating shafts or guiding components, the precisely machined shoulder diameter and length offer stable support, enhancing overall equipment reliability and reducing downtime in industrial settings.
Specification Summary & Compliance
This shoulder screw features a 3/8"-16 UNC thread with Class 3A tolerance for precise fit, and shoulder dimensions including a 1/2" diameter and 1 5/8" length with tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"). It complies with ASME B18.3 specifications, RoHS 3 (2015/863/EU), and REACH (EC 1907/2006) regulations, ensuring adherence to industry standards for safety and environmental responsibility.
