S-91251A442 1/4"-28 x 1" 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 failure risks in demanding applications.
- Superior corrosion resistance from the black-oxide finish prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit guarantees tight, secure fastening with minimal play, enhancing assembly integrity and vibration resistance.
- Fine UNRF threads provide improved load distribution and better sealing capabilities compared to coarse threads, ideal for precision equipment.
- Hex socket drive design allows for high-torque installation in confined spaces, streamlining assembly and disassembly processes.
- Full threading along the 1" length offers versatile positioning and adjustment flexibility, accommodating various material thicknesses.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety, meeting global regulatory standards.
Professional Applications & Engineering Value
Engineered for high-performance industrial applications, these black-oxide alloy steel socket head cap screws address critical challenges like vibration loosening and corrosion in machinery, automotive, and aerospace assemblies. The fine UNRF thread and Class 3A fit deliver superior clamping force and fatigue resistance, preventing joint failure in dynamic loads. With a Rockwell C37 hardness and 170,000 psi tensile strength, they withstand extreme operational stresses while the hex drive facilitates efficient installation in tight spaces, reducing labor time and improving project timelines for B2B clients.
Specification Summary & Compliance
This screw features a 1/4"-28 UNRF fine thread with Class 3A tolerance for precision fit, manufactured per ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards in industrial fastener supply chains.
