S-91259A107 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity - With 140,000 psi tensile strength and 84,000 psi minimum shear strength, this screw reliably handles high-stress applications without failure.
• Superior Wear Resistance - The black oxide finish on alloy steel provides excellent corrosion protection and reduces friction during operation.
• Precision Alignment & Stability - The 3/8" shoulder length with tight tolerances ensures accurate component positioning and prevents rotation.
• Optimized Thread Performance - 10-24 UNC coarse threads with Class 3A fit enable faster assembly and superior vibration resistance in demanding environments.
• Enhanced Grip & Installation - Knurled socket head with hex drive prevents tool slippage and allows for high-torque installation in confined spaces.
• Industry Compliance Assurance - Meets ASME B18.3 specifications and complies with RoHS 3 & REACH regulations for global industrial use.
• Consistent Hardness Profile - Rockwell C32 hardness maintains structural integrity under repeated loading cycles and impact forces.

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions where precision alignment and high strength are paramount. The 3/8" shoulder length with controlled diameter tolerance provides exact bearing surfaces for rotating components in machinery, eliminating misalignment issues in industrial applications. The black oxide finish reduces galling and wear while the 10-24 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments like automotive assemblies and heavy equipment. The knurled socket head design allows reliable tool engagement for maintenance operations, making these shoulder screws ideal for pivots, axles, and guide pins where dimensional stability and 140,000 psi tensile strength prevent mechanical failures.

Specification Summary & Compliance

Manufactured to ASME B18.3 standards with Class 3A thread fit for precision fastening applications. The shoulder diameter maintains -0.004" to -0.002" tolerance while shoulder length holds -0.005" to 0.005" tolerance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification to ASTM A574 ensures consistent mechanical properties including Rockwell C32 hardness and 140,000 psi tensile strength.