S-90128A108 4-40 x 3/8" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress applications
- Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance
- Hardened Rockwell C37 alloy steel construction delivers excellent durability and wear resistance
- Standard hex drive design allows for easy installation with common tools while preventing stripping
- Fully threaded body enables maximum engagement and consistent clamping force along the entire length
- Industry compliance assurance with ASTM A574 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
This 4-40 UNC socket head cap screw delivers critical performance advantages for precision assembly applications where space constraints and reliability are paramount. The zinc-plated alloy steel construction provides essential corrosion protection for machinery, automotive components, and electronic enclosures exposed to harsh operating conditions. Engineered with Class 3A thread fit and coarse UNC threads, these fasteners maintain secure connections in high-vibration environments while the socket head design allows for compact installation in tight spaces. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness ensures these screws withstand extreme mechanical stresses without failure, making them ideal for critical joints in manufacturing equipment, aerospace assemblies, and precision instruments.
Specification Summary & Compliance
This socket head cap screw features precision 4-40 UNC coarse threads with Class 3A fit for superior dimensional accuracy. Manufactured to ASTM A574 specifications for socket head cap screws, it ensures consistent quality and performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications. With 3/8" length and right-hand thread direction, this inch-system fastener meets rigorous industry standards for mechanical properties and environmental safety.
