S-90342A128 1/4"-20 x 3/4" Alloy Steel Socket Head Screws with Split Lock Washer
Alloy Steel Socket Head Screws with Split 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 through the integrated split lock washer, preventing loosening in high-stress environments
- Exceptional tensile strength of 180,000 psi for reliable performance in heavy-duty industrial applications
- Enhanced durability and corrosion resistance with black-oxide alloy steel construction and Rockwell C39 hardness
- Precise Class 3A thread fit ensuring secure, accurate fastening with minimal risk of cross-threading
- Easy installation and removal with standard hex drive design for efficient maintenance and assembly
- Full thread coverage along the 3/4" length for maximum grip and load distribution
- Compliance with environmental standards including RoHS 3 and REACH for safe, sustainable use
Professional Applications & Engineering Value
This 1/4-20 UNC socket head cap screw is engineered to address critical challenges in demanding industrial settings. The black-oxide alloy steel construction provides excellent resistance to corrosion and wear, while the Rockwell C39 hardness ensures long-term durability under repetitive stress. The integrated split lock washer effectively counters vibration-induced loosening, a common failure point in machinery and equipment. With its coarse thread spacing and Class 3A thread fit, it offers rapid installation and reliable clamping force in applications such as automotive assemblies, heavy machinery, and precision manufacturing. The fully threaded design maximizes engagement in tapped holes, distributing load evenly to prevent joint failure.
Specification Summary & Compliance
This fastener features a 1/4"-20 UNC thread with Class 3A fit for high precision, coarse thread spacing, and right-hand thread direction. It is manufactured from black-oxide alloy steel with a tensile strength of 180,000 psi and hardness of Rockwell C39. The screw includes a split lock washer (0.354" OD, 1/16" thickness) made from black-oxide steel. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence.
