S-91251A039 3/8"-24 x 4 1/2" 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
- Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies.
- Fine UNF threads offer improved load distribution and better sealing capabilities compared to coarse threads.
- Partially threaded design allows for controlled clamping force and easier alignment in applications.
- Hex socket drive enables high-torque installation with standard tools, minimizing stripping and improving efficiency.
- Rockwell C37 hardness balances durability with machinability, resisting wear over repeated use.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses critical challenges in machinery, automotive, and heavy equipment assembly. The 3/8"-24 UNF fine thread and Class 3A fit ensure minimal backlash and enhanced vibration resistance, crucial for dynamic load environments. The alloy steel construction with a black-oxide surface treatment provides a durable barrier against oxidation and chemical exposure, reducing maintenance needs. Its partially threaded shank allows precise engagement in tapped holes, preventing cross-threading and improving joint integrity. Ideal for high-stress connections where reliability and compliance with industry standards are paramount.
Specification Summary & Compliance
This screw meets ASTM A574 specifications for high-strength metric socket head cap screws, ensuring consistent quality and performance. Threads conform to UNF standards with a Class 3A fit for precise engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmental and safety standards in global supply chains.
