S-95373A154 1/4"-20 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex 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 corrosion resistance with hot-dipped galvanized finish for extended service life in harsh industrial environments
- High-strength steel construction delivers 60,000 psi tensile strength for reliable performance in demanding applications
- Rockwell B69 hardness rating ensures excellent durability and resistance to wear during repeated use
- External hex drive design provides secure tool engagement and efficient installation with standard wrenches
- UNC coarse threading offers faster assembly and reduced cross-threading risk compared to fine threads
- Partial threading configuration allows for precise clamping force control in various material thicknesses
- Comprehensive compliance with ASME B18.2.1, RoHS 3, and REACH regulations ensures quality and environmental safety
Professional Applications & Engineering Value
These hot-dipped galvanized steel hex head screws provide exceptional corrosion protection for outdoor structures, marine equipment, and industrial machinery exposed to moisture and chemicals. The 1/4"-20 UNC coarse thread with Class 2A fit ensures reliable engagement in steel framing, construction projects, and heavy equipment assembly. The partial threading design prevents overtightening while maintaining secure fastening across varying material thicknesses. With 60,000 psi tensile strength and Rockwell B69 hardness, these screws withstand vibration and dynamic loads in manufacturing, infrastructure, and transportation applications where external hex drive accessibility is crucial for maintenance and assembly efficiency.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with Class 2A thread fit tolerance for consistent performance. The 1/4"-20 UNC coarse thread with 3/4" minimum thread length on a 3" overall length provides standardized dimensional accuracy. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting ASTM A307 grade requirements for carbon steel bolts in general purpose applications.
