S-91327A112 10-24 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon patch thread locker ensures secure, reliable fastening that withstands loosening under dynamic loads and temperature fluctuations from -50° to 250° F.
• Exceptional strength and durability: Manufactured from 18-8 stainless steel with a Rockwell B55 hardness and 70,000 psi tensile strength for long-lasting performance in demanding environments.
• Precise alignment and smooth rotation: The precision-machined shoulder with controlled diameter and length tolerances provides accurate component location and acts as a pivot or bearing surface.
• Superior thread engagement: Class 3A thread fit on the 10-24 UNC coarse thread ensures tight, reliable connections with minimal risk of cross-threading or stripping.
• Enhanced installation grip: Knurled socket head with a standard hex drive (1/8") offers excellent tool engagement and slip resistance, even with gloved hands or in oily conditions.
• Corrosion resistance and longevity: Passivated finish on 18-8 stainless steel provides enhanced protection against rust and corrosion, extending service life.
• Regulatory and standards compliance: Meets ASME B18.3 specifications and is RoHS 3 and REACH compliant, ensuring suitability for regulated industrial and international applications.

Professional Applications & Engineering Value

This 10-24 UNC shoulder screw is engineered to solve critical challenges in machinery assembly, automation systems, and precision equipment. The 18-8 stainless steel construction offers excellent corrosion resistance and mechanical strength, ideal for environments where exposure to moisture, chemicals, or stress is a concern. The integrated nylon patch locking feature effectively prevents spontaneous loosening caused by vibrations, a common failure point in motors, conveyors, and rotating assemblies. The precision shoulder with its tight diameter and length tolerances ensures accurate alignment of components such as gears, pulleys, and linkages, reducing wear and maintaining operational accuracy. The knurled socket head and hex drive facilitate secure tool engagement, speeding up installation and maintenance in confined spaces. This screw is a reliable choice for applications demanding high tensile strength, dimensional stability, and vibration resistance, providing long-term reliability and reducing maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a 10-24 UNC coarse thread with a Class 3A thread fit for precise, secure fastening. The shoulder diameter is 1/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/2" with a tolerance of -0.005" to 0.005", ensuring consistent performance. It is manufactured in compliance with ASME B18.3 standards and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting essential environmental and safety regulations for industrial use.