S-91251A092 3-48 x 1/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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, minimizing maintenance needs.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading enables quick installation and removal, saving time in assembly and disassembly processes.
- Fully threaded design allows for consistent clamping force along the entire length, improving joint stability.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced degradation. The 3-48 UNC coarse thread with Class 3A fit provides superior engagement in metals and plastics, resisting back-off in dynamic loads. The black-oxide surface treatment enhances durability by forming a protective layer against moisture and chemicals, making it ideal for machinery, automotive, and electronics assemblies where high tensile strength (170,000 psi) and reliability are critical. Its hex drive socket head allows for compact installation in confined spaces, streamlining maintenance in precision equipment.
Specification Summary & Compliance
This fastener adheres to Class 3A thread fit for precise dimensional accuracy under the Unified National Coarse (UNC) standard. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in various industries.
