S-91251A266 5-40 x 5/32" 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 in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections with minimal backlash in critical assemblies.
- Compact 3/32" hex drive allows for easy installation in confined spaces while maintaining high torque transmission.
- Fully threaded design provides consistent clamping force along the entire 5/32" length for uniform load distribution.
- High hardness rating (Rockwell C37) ensures excellent wear resistance and durability under repeated use.
- Compliance with ASTM A574 ensures material consistency and manufacturing quality for engineering-critical applications.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address common industrial challenges such as vibration loosening, corrosion, and space constraints. The 5-40 UNC coarse threads with Class 3A fit provide superior engagement in soft materials and faster assembly compared to fine threads, while the fully threaded design ensures maximum grip length in thin-section applications. The socket head with 3/32" hex drive enables high torque application in tight spaces, making them ideal for precision machinery, automotive components, and electronic enclosures where reliability and compact design are critical. The combination of 170,000 psi tensile strength and Rockwell C37 hardness delivers exceptional fatigue resistance in dynamic load conditions.
Specification Summary & Compliance
This socket head cap screw features precision 5-40 UNC coarse threads with Class 3A fit tolerances, ensuring consistent thread engagement. Manufacturing complies with ASTM A574 specification for alloy steel socket head cap screws. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards for industrial use.
