S-91259A540 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 shear strength for reliable performance in demanding applications
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments
• Precision Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
• Rockwell C32 hardness rating delivers excellent wear resistance and durability under repeated use
• Knurled socket head design allows for secure tool grip and easy installation with standard 1/8" hex drivers
• Tight shoulder diameter tolerance (-0.004" to -0.002") enables precise component alignment and smooth rotational movement
• Comprehensive regulatory compliance meets ASME B18.3, ASTM A574, RoHS 3, and REACH standards for global acceptance

Professional Applications & Engineering Value

This 10-24 UNC thread shoulder screw delivers exceptional engineering value in precision mechanical systems where alignment accuracy and rotational stability are critical. The alloy steel construction with Rockwell C32 hardness provides optimal strength-to-weight ratio while resisting deformation under heavy loads. The black oxide finish offers superior corrosion protection in manufacturing environments exposed to moisture and chemicals. The 3/8" shoulder length with tight diameter tolerances ensures precise bearing surfaces and component positioning in machinery, automation equipment, and precision instruments. The coarse UNC thread with Class 3A fit prevents loosening from vibration while facilitating quick assembly in high-volume production settings. This socket head shoulder screw solves common fastening challenges in robotics, conveyor systems, and precision manufacturing where reliable performance and dimensional accuracy are non-negotiable.

Specification Summary & Compliance

This precision shoulder screw maintains Class 3A thread fit per UNC standards with a 10-24 coarse thread configuration. The shoulder diameter features tight tolerance control (-0.004" to -0.002") while the shoulder length maintains precision within -0.005" to 0.005" tolerance range. Manufactured to ASME B18.3 specifications and ASTM A574 material standards, this fastener delivers consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets. With documented mechanical properties including 140,000 psi tensile strength and 84,000 psi minimum shear strength, this shoulder screw meets the rigorous demands of professional engineering applications.