S-91251A927 1/4"-28 x 6" 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
- Superior tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
- Precise Class 3A thread fit provides tighter tolerances for improved assembly accuracy and vibration resistance in machinery and equipment.
- Black-oxide coating on alloy steel offers excellent corrosion resistance, extending service life in harsh industrial environments.
- Fine UNF thread spacing allows for better adjustment and holding power in materials where coarse threads may not be suitable.
- Hex socket drive design enables high torque application with reduced risk of stripping, ideal for confined spaces.
- Partially threaded shank provides unthreaded portion for precise clamping without damaging threads, enhancing joint integrity.
- Compliance with ASTM A574 guarantees consistent quality and mechanical properties for critical engineering applications.
Professional Applications & Engineering Value
Engineered for rigorous industrial use, this 1/4"-28 UNF Socket Head Cap Screw delivers exceptional reliability in applications requiring high clamping force and durability. The black-oxide alloy steel construction combined with Rockwell C37 hardness resists wear and environmental degradation, making it ideal for automotive assemblies, heavy machinery, and precision equipment. Its fine thread spacing and Class 3A thread fit ensure secure fastening in vibration-prone setups, while the hex drive facilitates easy installation in tight spaces. This screw addresses common issues like loosening under dynamic loads and corrosion-induced failure, providing long-term performance in manufacturing, aerospace, and construction sectors.
Specification Summary & Compliance
This product adheres to Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy. It meets ASTM A574 specifications for material and mechanical properties, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance adherence for global industrial use.
