S-91273A568 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments
• Superior torque transmission and grip thanks to the knurled socket head and hex drive design, reducing tool slippage during installation
• High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications
• Precision alignment and reduced wear with a consistent 1-1/4" shoulder length and standard shoulder fit, ensuring smooth rotational movement
• Wide compatibility and easy assembly with UNC coarse threads and Class 2A thread fit, facilitating quick installation and interchangeability
• Durable surface protection via black oxide coating, which minimizes galling and extends service life under frequent use
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable usage in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 shoulder screw is engineered to address common challenges in precision machinery, such as misalignment and component wear. The 18-8 stainless steel base provides excellent resistance to rust and oxidation, while the black oxide finish adds an extra layer of protection against corrosion and reduces friction in high-movement assemblies. The knurled socket head and hex drive ensure secure tool engagement, preventing stripping and enabling high-torque applications. With a 1-1/4" shoulder length and UNC coarse threads, it offers reliable positioning in pivots, gears, and linkages, minimizing backlash and extending the lifespan of industrial equipment. Ideal for use in automotive, robotics, and heavy-duty manufacturing, this shoulder screw enhances assembly accuracy and operational reliability.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 2A thread fit for standard tolerance and easy assembly. The shoulder diameter is 1/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 1-1/4" with a tolerance of -0.005" to 0.005", ensuring precise dimensional control. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards. Manufactured to deliver consistent performance with a hardness of Rockwell B55, it meets the requirements for various industrial fastening applications.