S-91829A301 1/4"-20 MS51575-27, NASM51575 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
• Precise component alignment ensured by a controlled shoulder diameter tolerance of -0.001" to 0" and precise shoulder fit.
• High tensile strength of 70,000 PSI provides reliable load-bearing capacity and durability in demanding applications.
• Consistent thread engagement with Class 2A thread fit and UNC coarse threads for easy assembly and vibration resistance.
• Socket head design allows for secure tool engagement and efficient installation in confined spaces.
• Compliance with MS51575-27 specifications guarantees adherence to stringent aerospace and industrial standards.
• Environmental regulation compliance including RoHS 3 and REACH, ensuring safe and sustainable use.

Professional Applications & Engineering Value

This 1/4-20 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. Made from 18-8 stainless steel with a passivated finish, it resists corrosion in moist or chemical-exposed settings, reducing maintenance needs. The precise shoulder diameter and Class 2A thread fit enable exact positioning in machinery, jigs, and pivoting mechanisms, minimizing wear and misalignment. With a 70,000 PSI tensile strength and Rockwell B55 hardness, it withstands high-stress conditions in aerospace, automotive, and industrial equipment, ensuring long-term reliability and performance consistency.

Specification Summary & Compliance

The screw features a Class 2A thread fit with UNC coarse threads for standard industrial use, and shoulder dimensions including a diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002" for precision assembly. It conforms to MS51575-27 specifications and is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring adherence to environmental and safety regulations.