S-91259A585 1/4"-20 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 providing 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precise thread engagement with Class 3A fit and UNC coarse thread ensuring secure fastening and vibration resistance.
- Easy installation and removal featuring a knurled socket head with 5/32" hex drive for improved grip and torque application.
- Accurate alignment and spacing provided by the 1 1/4" shoulder with tight diameter and length tolerances for consistent assembly.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
- High hardness rating of Rockwell C32 for wear resistance and long-term reliability in mechanical systems.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The alloy steel material, combined with a black oxide finish, offers excellent resistance to corrosion and wear, making it ideal for environments exposed to moisture, chemicals, or frequent movement. The UNC coarse thread and Class 3A fit ensure quick assembly and secure fastening, reducing the risk of loosening under vibration. With a robust shoulder diameter and precise length tolerances, it provides reliable pivoting, spacing, and rotational support in applications like bearings, linkages, and gears, enhancing overall system durability and reducing maintenance needs.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for high precision, along with a shoulder diameter of 5/16" and length of 1 1/4" within tight tolerance ranges. It meets ASME B18.3 specifications for dimensional accuracy and is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring it is free from hazardous substances and suitable for global industrial use.
