S-90807A111 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – Withstands up to 140,000 psi for reliable performance in high-stress industrial applications
• Superior Corrosion Resistance – Black oxide finish protects against rust and extends service life in harsh environments
• Precision Thread Fit – Class 3A UNC threads ensure tight, secure fastening with minimal backlash
• Enhanced Material Durability – Alloy steel construction with Rockwell C32 hardness maintains integrity under repeated loads
• Secure Anti-Slip Grip – Knurled head design prevents tool slippage during installation and removal
• Optimized Shoulder Alignment – Standard shoulder fit with tight diameter tolerance provides accurate component positioning
• Regulatory Compliance – Meets RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical precision in applications requiring exact component alignment and high load-bearing capacity. The 1/4"-20 UNC coarse thread with Class 3A fit ensures secure fastening in machinery, automation systems, and precision instruments where vibration resistance is essential. The black oxide finish provides an added layer of corrosion protection, making it suitable for industrial environments exposed to moisture and chemicals. With its knurled socket head and hex drive design, installation torque is efficiently transferred without stripping, while the precisely machined shoulder maintains consistent spacing between components. These features combine to reduce maintenance frequency and prevent misalignment issues in demanding assembly operations.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit per UNC standards with a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured from alloy steel with Rockwell C32 hardness and 140,000 psi tensile strength, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for industrial distribution and use.