S-90344A117 1/4"-20 x 1 1/2" ASME B18.3, ASTM A574 Socket Head Screws with Flat Washer
Socket Head Screws with Flat Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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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.
- Enhanced corrosion resistance from the black-oxide finish on both the alloy steel screw and washer, extending service life in demanding environments.
- Superior load distribution with the integrated flat washer, minimizing surface damage and maintaining joint integrity under heavy loads.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Hex socket drive design allows for high-torque installation with standard tools, improving efficiency in tight spaces.
- Full threading and UNC coarse pitch enable quick assembly and strong holding power in a variety of materials.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH ensures safety and regulatory acceptance for global projects.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial use, these black-oxide alloy steel socket head cap screws address common challenges like vibration loosening and corrosion in machinery assembly. The Class 3A thread fit and UNC coarse threads provide exceptional grip and ease of installation in metals and composites, while the integrated flat washer distributes clamping force evenly to prevent surface indentation. Ideal for precision equipment, automotive systems, and construction machinery, these screws deliver consistent performance under high tensile and shear loads, backed by 170,000 psi tensile strength and Rockwell C39 hardness for long-term reliability in harsh conditions.
Specification Summary & Compliance
This product features a 1/4"-20 UNC thread with Class 3A fit and a length of 1-1/2", manufactured to ASME B18.3 specifications for dimensional accuracy. The black-oxide steel flat washer (1/2" OD, 1/16" thickness) complements the screw for enhanced performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
