S-91259A546 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 high-stress applications
• Precision Class 3A thread fit ensures secure, vibration-resistant fastening and consistent assembly quality
• Corrosion-resistant black oxide finish provides durable protection against wear and extends service life in demanding environments
• Knurled socket head with hex drive offers superior grip and torque transmission during installation, reducing tool slippage
• Rockwell C32 hardness maintains dimensional stability and resists deformation under heavy mechanical loads
• 1½" shoulder length with tight tolerances enables precise component alignment and rotational movement in assemblies
• Full compliance with ASME B18.3 standards guarantees interchangeability and reliability in industrial applications

Professional Applications & Engineering Value

This 10-24 UNC thread shoulder screw delivers critical engineering solutions where precision alignment and rotational control are paramount. The alloy steel construction with black oxide finish provides excellent corrosion resistance while maintaining the high tensile strength required for demanding mechanical systems. The knurled socket head design ensures secure tool engagement, preventing damage during high-torque installation in confined spaces. Engineers specify these ASME B18.3 compliant shoulder screws for precision machinery, automation equipment, and rotating assemblies where the 1½" shoulder length serves as an accurate pivot point or bearing surface. The Class 3A thread fit maintains consistent clamping force in vibration-prone environments, making these industrial shoulder screws ideal for manufacturing equipment, robotics, and automotive applications requiring reliable, long-term performance.

Specification Summary & Compliance

This shoulder screw features 10-24 UNC coarse threads with Class 3A thread fit for precision engagement. Critical dimensions include 3/8" thread length and 1½" shoulder length with tight tolerances (-0.005" to 0.005" for shoulder length). The ¼" shoulder diameter maintains -0.004" to -0.002" tolerance for precise component fit. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, this fastener is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial applications.