S-91259A537 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: Withstands up to 140,000 psi, ensuring reliable performance in high-stress industrial applications.
• Superior Corrosion Resistance: Black oxide finish provides durable protection against rust and wear in harsh environments.
• Precision Thread Fit: Class 3A UNC coarse threads offer tight, secure fastening with reduced risk of loosening.
• High Shear Strength: Minimum 84,000 psi shear strength enhances joint integrity under dynamic loads.
• Consistent Dimensional Accuracy: Tight shoulder tolerances (±0.005") ensure precise alignment in assemblies.
• Easy Installation & Removal: Hex socket drive with knurled head allows for quick, slip-resistant tool engagement.
• Regulatory Compliance: Meets ASME B18.3, RoHS 3, and REACH standards for safe, global industrial use.

Professional Applications & Engineering Value

This alloy steel shoulder screw with a black oxide finish is engineered to address common industrial challenges like misalignment, vibration loosening, and corrosion in machinery. The 10-24 UNC coarse thread and Class 3A fit provide secure fastening in high-vibration environments, while the 3/8" shoulder length ensures accurate pivoting and spacing in assemblies such as rotating shafts, linkages, and precision instruments. Its Rockwell C32 hardness and high tensile strength make it ideal for demanding applications in automotive, aerospace, and manufacturing equipment, reducing maintenance needs and improving operational reliability.

Specification Summary & Compliance

This shoulder screw features a 10-24 UNC thread with Class 3A fit, ensuring precise thread engagement and durability. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for consistent performance. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.