S-90401A535 1/4"-20 x 3/8" Hex Head Screws with Lock Washer
Hex Head Screws with Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior vibration resistance with integrated external-tooth lock washer, preventing loosening in high-motion industrial environments
- Exceptional 60,000 PSI tensile strength ensures reliable performance under heavy loads and mechanical stress
- Enhanced corrosion protection through zinc-plated steel construction, extending service life in demanding conditions
- Precise Class 2A thread fit guarantees smooth installation and secure fastening with standard UNC coarse threading
- Optimized for high-torque applications with 7/16" hex head design providing superior grip and driving efficiency
- Full threading along 3/8" length delivers maximum engagement and holding power across the entire fastener
- Consistent Rockwell B70 hardness maintains structural integrity and prevents stripping during repeated use
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these zinc-plated steel hex head screws with external-tooth lock washers provide critical vibration resistance in machinery, equipment assembly, and automotive components. The UNC coarse thread design ensures rapid installation while maintaining secure fastening in materials where fine threads might strip or fail. With 60,000 PSI tensile strength and Rockwell B70 hardness, these fully threaded fasteners withstand significant mechanical stress without deformation, making them ideal for structural applications where reliability is paramount. The combination of right-hand threading and Class 2A fit provides consistent performance across production runs while the integrated locking mechanism eliminates the need for separate anti-vibration components.
Specification Summary & Compliance
This 1/4"-20 x 3/8" hex head screw features UNC coarse threading with Class 2A tolerance for precise fit and reliable performance. Manufactured from zinc-plated steel with Rockwell B70 hardness and 60,000 PSI tensile strength. Includes integrated external-tooth lock washer (0.475" OD, 0.028" thickness) for vibration resistance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.
