S-94128A164 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior strength and durability from high-grade alloy steel with Rockwell C32 hardness, ensuring long-lasting performance under heavy loads.
• Precise alignment and reduced wear thanks to the exact 5/16" shoulder diameter with tight tolerance, providing stable component positioning.
• Reliable fastening in high-vibration environments with Class 3A thread fit and coarse UNC thread, minimizing loosening risks.
• Easy installation and adjustment using the slotted drive on the headless design, ideal for space-constrained assemblies.
• Consistent dimensional accuracy with controlled shoulder length (5/8") and diameter tolerances, ensuring repeatable results in automated production.
• Compliance with global safety standards including RoHS 3 and REACH, making it suitable for regulated industrial and export markets.
• Versatile right-hand thread design compatible with standard UNC 1/4"-20 components, simplifying inventory and replacement.

Professional Applications & Engineering Value

This 1/4"-20 UNC shoulder screw is engineered to address critical alignment and stability challenges in precision machinery, such as rotating assemblies, pivoting mechanisms, and guide systems. The alloy steel construction and Rockwell C32 hardness provide exceptional resistance to shear forces and wear, reducing maintenance downtime. Its headless, slotted drive design allows for flush mounting in tight spaces, while the precise shoulder diameter and length ensure accurate axial positioning of components like bearings or gears. By integrating a Class 3A thread fit and coarse thread spacing, it offers robust fastening in high-stress applications, from automotive jigs to industrial automation equipment, enhancing overall assembly reliability and lifespan.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for superior precision. Dimensions include a 0.25" thread diameter, 7/16" thread length, 5/16" shoulder diameter (tolerance: -0.001" to 0"), and 5/8" shoulder length (tolerance: 0" to 0.005"). It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and safety standards for industrial use.