S-90807A113 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional durability with alloy steel construction providing 140,000 psi tensile strength and Rockwell C32 hardness for reliable performance in high-stress applications.
• Superior corrosion resistance from the black oxide finish, extending service life in demanding industrial environments.
• Precise alignment and reduced wear due to the Class 3A thread fit and standard shoulder fit, ensuring accurate component positioning.
• Secure and easy installation with the hex drive socket head and knurled texture, allowing for firm tool grip and efficient assembly.
• Versatile coarse UNC threading (1/4"-20) with right-hand direction, facilitating quick fastening in various machinery and equipment.
• Consistent dimensional accuracy with tight shoulder diameter and length tolerances, promoting repeatable assembly and reduced downtime.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use in global markets.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and component wear. The black oxide finish provides a protective layer against rust and corrosion, making it ideal for applications in automotive, aerospace, and heavy machinery where exposure to harsh conditions is common. The Class 3A thread fit and precise shoulder dimensions ensure secure fastening and accurate positioning in assemblies, reducing vibration and extending equipment lifespan. With a coarse UNC thread and hex drive, it allows for quick installation and removal, streamlining maintenance processes. Commonly used in pivots, axles, and guides, this screw delivers reliable performance and long-term durability in demanding engineering environments.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC threading (1/4"-20) and coarse spacing, ensuring high precision and interchangeability. Dimensions include a shoulder diameter of 1/4" with tolerance from -0.004" to -0.002", and shoulder length of 1/2" with tolerance from -0.005" to 0.005". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for industrial use.