S-91259A476 1/4"-20 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi for reliable performance in high-stress industrial applications.
• Superior corrosion resistance from the black oxide finish, extending service life in harsh environments.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening.
• High-strength alloy steel construction with Rockwell C32 hardness for enhanced durability and wear resistance.
• Knurled socket head provides improved grip and ease of installation with standard hex tools.
• Coarse UNC threads enable quick assembly and disassembly, reducing maintenance time.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality and environmental safety for global use.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common industrial challenges such as misalignment and vibration-induced failures. The alloy steel material, combined with a black oxide finish, offers excellent resistance to corrosion and wear, making it ideal for machinery, automotive assemblies, and precision equipment. The 1/4"-20 UNC coarse threads with Class 3A fit provide secure fastening in dynamic environments, while the knurled head enhances tool engagement for efficient installation. Its robust design ensures reliable performance in applications requiring high tensile strength and dimensional stability, reducing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a thread size of 1/4"-20 UNC with Class 3A thread fit and tolerances for shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"). It meets ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to quality and environmental safety requirements.