S-91251A908 1/4"-20 x 7" 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 – Withstands up to 170,000 psi, ensuring reliable performance in high-stress industrial applications.
- Superior Hardness & Durability – Rockwell C37 hardness provides excellent resistance to wear, deformation, and fatigue over time.
- Precise Thread Fit – Class 3A UNC coarse threads offer tighter tolerances for secure, vibration-resistant fastening.
- Corrosion-Resistant Finish – Black-oxide coating on alloy steel enhances protection against rust and extends service life.
- Optimized Load Distribution – Partially threaded design concentrates strength where needed, reducing the risk of thread stripping.
- Wide Industrial Compliance – Meets ASTM A574, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.
- Easy Installation & Removal – Hex drive (3/16") and standard socket head allow for efficient torque application in confined spaces.
Professional Applications & Engineering Value
Engineered for demanding environments, this Black-Oxide Alloy Steel Socket Head Cap Screw delivers robust fastening solutions where precision and strength are critical. The UNC coarse thread and Class 3A fit minimize loosening under vibration, making it ideal for machinery, automotive assemblies, and heavy equipment. Its partially threaded configuration ensures that clamping force is focused on the engaged section, reducing stress concentration. With a 170,000 psi tensile strength and corrosion-resistant black-oxide finish, it withstands harsh conditions while complying with industry standards like ASTM A574, supporting long-term reliability in industrial and engineering projects.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for superior accuracy. Manufactured under ASTM A574 specifications, it includes a black-oxide surface treatment for enhanced durability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for global industrial use.
