S-97832A280 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing replacement frequency.
• Enhanced torque transmission and grip from the knurled socket head and 3/16" hex drive, preventing tool slippage during installation.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength, ensuring reliable performance under stress.
• Precise component alignment due to the Class 3A thread fit and standard shoulder fit, minimizing assembly play and vibration.
• Excellent durability and wear resistance provided by Rockwell B55 hardness, extending the service life of the screw.
• Broad compatibility and easy sourcing with 1/4"-20 UNC coarse right-hand threads, conforming to common industrial standards.
• Safe for regulated applications as it is RoHS 3 and REACH compliant, meeting global environmental and safety requirements.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 Stainless Steel material offers excellent corrosion resistance, making it suitable for machinery exposed to moisture, chemicals, or outdoor conditions. The knurled socket head with a hex drive ensures secure tool engagement, reducing the risk of stripping and enabling high-torque fastening. The Class 3A thread fit and precise shoulder dimensions provide stable pivoting and locating functions in assemblies, minimizing misalignment and wear in moving parts like linkages, gears, and pivots. Its coarse UNC thread facilitates quicker assembly and disassembly, enhancing maintenance efficiency in production lines and heavy-duty equipment.

Specification Summary & Compliance

The screw features a 1/4"-20 UNC thread with Class 3A fit for tight tolerance and reliable engagement. Shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and shoulder length is 1" with a tolerance of -0.005" to 0.005" for precise dimensional control. It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard quality.