S-90401A240 10-24 x 3/8" Hex Head Screws with Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance thanks to the integrated external-tooth lock washer that maintains clamping force under dynamic loads
• High tensile strength of 60,000 psi ensures reliable performance in demanding industrial applications and prevents fastener failure
• Corrosion-resistant zinc-plated steel construction provides durable protection against environmental factors, extending service life
• Easy installation and removal with standard external hex drive and right-hand coarse (UNC) threads for efficient assembly
• Precise Class 2A thread fit guarantees consistent engagement and reduces the risk of cross-threading during installation
• Full threading along the 3/8" length offers maximum grip and versatility for various material thicknesses
• Rockwell B70 hardness provides excellent wear resistance and maintains thread integrity under repeated use

Professional Applications & Engineering Value

Engineered for industrial applications where vibration loosening is a critical concern, this 10-24 UNC hex head screw combines zinc-plated steel durability with an external-tooth lock washer to solve common fastening failures. The coarse thread design ensures quick assembly and reliable holding power in softer materials or where speed is essential, while the fully threaded shank provides consistent clamping force across the entire length. Ideal for machinery, automotive components, and electrical enclosures, this fastener delivers vibration-resistant performance that reduces maintenance needs and downtime. The external hex drive allows for high-torque application with standard tools, making it a versatile choice for both production lines and field service.

Specification Summary & Compliance

This screw features a 10-24 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring compatibility with standard nuts and tapped holes. The assembly includes an external-tooth lock washer (0.381" OD, 0.024" thickness) made from zinc-plated steel. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming its suitability for environmentally regulated industries and global supply chains.