S-90324A102 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing maintenance frequency.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies.
• Left-hand UNC coarse thread offers secure fastening in applications requiring reverse-threading to prevent loosening from rotational forces.
• Knurled socket head with 5/32" hex drive allows for easy installation and removal, even with gloved hands or in tight spaces.
• Durable shoulder design with consistent diameter and length tolerances ensures accurate alignment and acts as a reliable pivot or spacer.
• Compliance with RoHS 3 and REACH guarantees environmental safety and meets international regulatory standards for industrial use.

Professional Applications & Engineering Value

This 1/4"-20 left hand thread shoulder screw is engineered to address common industrial challenges such as misalignment, vibration-induced loosening, and corrosion. The 18-8 stainless steel material provides excellent resistance to rust and chemicals, making it suitable for precision machinery, automotive assemblies, and conveyor systems where durability is critical. The left-hand UNC coarse thread is specifically designed for applications with counter-rotational forces, preventing accidental disassembly in equipment like motors and rotating shafts. Combined with a Class 3A thread fit, it ensures tight tolerances and reduces the risk of thread stripping, while the knurled socket head enhances grip for efficient maintenance. This screw delivers reliable performance in high-stress environments, minimizing downtime and extending service life.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. Key specifications include a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", ensuring consistent performance in industrial applications. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable operations.