S-91259A707 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with alloy steel construction and Rockwell C32 hardness for reliable performance in demanding applications
• Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments
• Precise shoulder fit and alignment with tight diameter and length tolerances ensuring accurate component positioning
• High load-bearing capability featuring 140,000 psi tensile strength and 84,000 psi minimum shear strength for secure fastening
• Easy installation and removal with hex socket drive and knurled head providing excellent grip and torque transmission
• Industry-standard compatibility through UNC coarse threading and Class 3A thread fit for consistent performance
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers critical engineering value in applications requiring precise shaft alignment and rotational control. The alloy steel construction with black oxide finish provides excellent corrosion resistance while maintaining the high strength needed for mechanical assemblies, pivots, and bearing surfaces. The 1/2" shoulder diameter with tight manufacturing tolerances ensures accurate component positioning, eliminating play and misalignment in machinery, automation systems, and precision equipment. The Class 3A thread fit and UNC coarse threading provide secure fastening in high-vibration environments, while the hex socket drive with knurled head enables efficient installation in confined spaces. These shoulder screws are engineered to solve alignment and durability challenges in industrial manufacturing, automotive, and aerospace applications where reliability is paramount.

Specification Summary & Compliance

This shoulder screw features precision dimensions including 3/8"-16 UNC thread with Class 3A fit, 1/2" shoulder diameter with tolerance of -0.004" to -0.002", and 1/2" shoulder length with tolerance of -0.005" to 0.005". Manufacturing complies with ASME B18.3 specifications where identified as ASTM A574. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant for environmental regulatory requirements.