S-90337A342 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
• Precise alignment and smooth rotation ensured by the shoulder's tight diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002").
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Secure, low-profile installation using a hex drive and low socket head, minimizing protrusion in compact spaces.
• Reliable thread engagement with UNC coarse threads and Class 2A fit, providing consistent fastening in right-hand direction.
• Compliance with global regulations including RoHS 3 and REACH, ensuring safe and sustainable use.
• Versatile industrial utility due to the 3/8" shoulder diameter and 7/8" shoulder length, suitable for pivots, axles, and spacers.

Professional Applications & Engineering Value

This 1/4-20 UNC shoulder screw is engineered to address critical alignment and wear issues in machinery and assemblies. The 18-8 stainless steel construction, enhanced by a passivated finish, resists corrosion and extends service life in moist or chemical-exposed settings. The precisely machined shoulder, with diameters held to -0.001" to 0" and lengths to 0" to 0.002", ensures minimal clearance for smooth rotational movement, reducing vibration and component wear. Its low profile socket head and hex drive allow for easy installation in tight spaces, while the Class 2A thread fit and coarse UNC thread provide reliable holding power. Ideal for use in pivoting mechanisms, bearing mounts, and precision instruments, this shoulder screw delivers consistent performance where exact tolerances and durability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. Shoulder dimensions are precision-controlled: diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". Manufactured from 18-8 stainless steel with a passivated surface treatment, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and safety standards are upheld for industrial fastener applications.