S-90342A112 4-40 x 3/8" 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
- Exceptional tensile strength of 180,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding applications.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-galling surface for extended service life.
- Integrated split lock washer prevents loosening from vibration, maintaining clamp load and assembly integrity over time.
- Rockwell C39 hardness delivers excellent wear resistance and durability, suitable for repetitive use in industrial environments.
- Standard hex socket drive allows for easy installation with common tools, improving assembly efficiency and reducing labor time.
- Full threading ensures consistent engagement along the entire length, providing uniform clamping force and versatility in various material thicknesses.
Professional Applications & Engineering Value
This 4-40 UNC threaded socket head cap screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and material fatigue. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness, provides robust resistance to wear and environmental factors, making it ideal for machinery, automotive assemblies, and precision equipment. The inclusion of a split lock washer enhances security in dynamic applications, preventing back-off and maintaining torque integrity. With its coarse UNC thread and Class 3A fit, it ensures quick assembly and reliable performance in high-vibration environments, reducing maintenance needs and downtime.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 3A fit for precise tolerance, fully threaded for consistent engagement. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met. Manufactured to high standards, it includes a split lock washer for added fastening security in industrial use.
