S-90969A230 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance under high-stress conditions, reducing fastener failure in demanding applications.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
• Black oxide finish offers enhanced corrosion resistance, extending service life in harsh industrial environments without compromising dimensional integrity.
• Knurled ultra-low socket head with 5/32" hex drive allows for easy installation and removal in confined spaces, improving assembly efficiency.
• Alloy steel construction with Rockwell C30 hardness delivers excellent wear resistance and durability for repeated use in high-load applications.
• Precision shoulder diameter and length with tight tolerances ensure accurate alignment and smooth rotation in pivoting or guiding mechanisms.
• RoHS 3 and REACH compliance guarantees environmental safety and regulatory adherence for global supply chain integration.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion in heavy-duty assemblies. The 1/4"-20 UNC coarse thread with Class 3A fit ensures rapid installation and secure fastening in equipment like conveyor systems, robotic arms, and precision machinery. The black oxide finish provides a protective layer against moisture and chemicals, ideal for automotive or manufacturing settings. Combined with a knurled ultra-low socket head, it facilitates tool engagement in tight spaces, reducing assembly time and enhancing operational reliability for industrial fastening solutions requiring high strength and dimensional accuracy.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A precision fit and coarse spacing for efficient assembly. Dimensions include a shoulder diameter of 5/16" with tight tolerances (-0.004" to -0.002") and shoulder length of 5/8" (±0.005"). Manufactured from alloy steel with Rockwell C30 hardness and 140,000 psi tensile strength, it adheres to industry standards for durability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global engineering applications.