S-91273A311 3/8"-16 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced torque transmission and alignment from the 3/4" shoulder length, minimizing component misalignment
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding applications
• Secure, non-slip fastening enabled by the knurled hex socket head for reliable installation
• Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
• Broad regulatory compliance including RoHS 3 and REACH, meeting global environmental standards
• Durable material hardness at Rockwell B55, providing excellent wear resistance and longevity

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 3/4" shoulder length acts as a precise pivot or spacer, eliminating bushing needs and reducing assembly time in machinery, automotive, and conveyor systems. Its UNC coarse threads and Class 2A fit ensure rapid installation and reliable performance under vibration, while the knurled hex socket head offers superior grip for high-torque applications. With a 70,000 psi tensile strength and corrosion-resistant properties, it delivers long-term reliability in demanding industrial environments, from manufacturing equipment to robotic arms.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3/4" with a tolerance of -0.005" to 0.005". It is manufactured from 18-8 stainless steel with a hardness of Rockwell B55 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety.