S-91054A210 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and TiCN coating, ideal for harsh industrial environments.
• Enhanced durability and wear resistance from the TiCN surface treatment, extending service life in high-friction applications.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
• Precise shoulder fit with controlled diameter and length tolerances for accurate alignment in assemblies.
• Easy installation and removal using a standard 5/32" hex socket drive, reducing assembly time.
• Wide compatibility with UNC coarse threads and Class 2A fit for secure fastening in various machinery.
• Compliance with RoHS 3 and REACH regulations for safe, environmentally responsible use in global markets.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address alignment and wear challenges in demanding industrial settings. The 18-8 Stainless Steel base material offers excellent resistance to rust and oxidation, while the TiCN coating significantly reduces friction and galling, making it ideal for high-cycle applications like rotating shafts, pivots, and guides in machinery. The 1/4"-20 UNC coarse thread and 3/8" thread length provide strong holding power, and the precisely machined shoulder ensures components stay accurately positioned, minimizing vibration and misalignment issues. With a hex socket head for easy access in tight spaces, this fastener enhances assembly efficiency and reliability in automotive, aerospace, and manufacturing equipment.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 2A fit for standard tolerance and easy assembly. The shoulder diameter is 5/16" with a tight tolerance of -0.002" to 0", and the shoulder length is 1/4" with a tolerance of 0" to 0.003" to ensure precise fit. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming its suitability for regulated industrial and commercial applications.