S-91251A412 6-40 x 1 1/8" 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior thread precision with Class 3A fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- Corrosion-resistant black-oxide coating on alloy steel enhances durability and longevity, even in demanding industrial environments.
- Fine UNF threading offers improved load distribution and better sealing capabilities compared to coarse threads.
- Fully threaded design allows for maximum grip and adjustability across the entire 1 1/8" length.
- Consistent Rockwell C37 hardness maintains dimensional stability and wear resistance over repeated use.
- Standard hex socket drive enables easy installation with common tools, minimizing assembly time and effort.
Professional Applications & Engineering Value
Engineered for precision and reliability, these Black-Oxide Alloy Steel Socket Head Cap Screws with 6-40 UNF fine threads address common industrial challenges such as vibration loosening and material fatigue. The Class 3A thread fit ensures minimal backlash and superior alignment in high-precision machinery, automotive assemblies, and aerospace components. The black-oxide surface treatment provides a protective layer that resists oxidation without significantly altering dimensions, making these screws ideal for applications requiring consistent clamping force and corrosion resistance. Their fully threaded configuration offers versatile fastening solutions across various material thicknesses, while the socket head design allows for compact installations in confined spaces.
Specification Summary & Compliance
This product features 6-40 UNF fine threads with Class 3A precision fit per UNF standards, ensuring exact dimensional accuracy. Manufactured in compliance with ASTM A574 specifications for alloy steel socket head cap screws, it meets stringent quality requirements. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial applications without restricted substances.
