S-90357A017 1/4"-20 x 1 1/4" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi provides superior load-bearing capacity and resistance to mechanical failure in demanding applications.
• Precision Class 3A thread fit ensures reliable, vibration-resistant fastening with minimal risk of loosening, enhancing assembly integrity.
• Black-oxide surface treatment on alloy steel offers excellent corrosion resistance and a durable, non-galling finish for extended service life.
• Ultra-low socket head profile allows for installation in confined spaces where clearance is limited, increasing design flexibility.
• Rockwell C32 hardness delivers optimal toughness and wear resistance, maintaining thread integrity through repeated use.
• Strict length tolerance of -0.005" to 0.005" guarantees consistent dimensional accuracy for precise, repeatable installations.
• Full compliance with RoHS 3 and REACH regulations ensures environmental safety and suitability for global industrial supply chains.

Professional Applications & Engineering Value

Engineered for high-stress environments, these 1/4"-20 UNC socket head cap screws with Class 3A thread fit address critical challenges in machinery assembly, automotive systems, and precision equipment. The black-oxide alloy steel construction combats corrosion and reduces friction during torque application, preventing seizing and thread damage. The ultra-low profile head and 1/8" hex drive enable secure fastening in tight spaces, minimizing protrusion and streamlining designs. With a coarse thread and fully threaded body, they provide rapid installation and uniform clamping force, ideal for vibration-prone applications where reliability is paramount. This combination of material strength and precision engineering ensures long-term performance in industrial fastening solutions.

Specification Summary & Compliance

This socket head cap screw adheres to UNC coarse thread standards with a Class 3A thread fit for high precision. Dimensions include a 1/4"-20 thread size, 1 1/4" length, and tight length tolerance of -0.005" to 0.005". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.