S-90337A327 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 70,000 psi and Rockwell B55 hardness for dependable performance under heavy mechanical loads.
• Precise shoulder fit with minimal tolerances (shoulder diameter: -0.001" to 0", length: 0" to 0.002") for accurate alignment in assemblies.
• Low-profile socket head design with hex drive for space-saving installation and secure, flush mounting.
• Coarse UNC thread (1/4"-20) with Class 2A fit for quick assembly and reduced cross-threading risks.
• Compliance with RoHS 3 and REACH regulations for safe, environmentally responsible use in global markets.
• Versatile 1/2" shoulder length providing stable bearing surfaces for rotating components like gears and pulleys.

Professional Applications & Engineering Value

This 1/4-20 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 18-8 stainless steel material, combined with a passivated finish, resists corrosion from moisture and chemicals, extending service life in machinery, automotive, and electronics applications. The low-profile socket head allows for compact designs while the hex drive ensures high torque application without slippage. The precisely machined shoulder diameter of 5/16" and controlled tolerances provide a snug fit for rotating parts, reducing wear and maintaining positional accuracy. Ideal for pivot points, linkages, and assembly jigs, it supports smooth operation and minimizes maintenance downtime.

Specification Summary & Compliance

The screw features a Class 2A thread fit per UNC standards, ensuring consistent engagement and interchangeability. Manufacturing adheres to precise dimensional controls for shoulder diameter (5/16") and length (1/2") with tight tolerances. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing the absence of hazardous substances for safe industrial use.