S-91309A548 1/4"-20 x 1 3/4" 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 zinc plating for extended service life in harsh industrial environments
- High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibration
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Coarse UNC threading with Class 2A fit delivers faster installation and superior grip in various materials
- External hex drive design allows for high-torque applications with standard tools
- Full threading along 1 3/4" length maximizes engagement and clamping force in demanding assemblies
- Compliance with ASME B18.2.1 standards guarantees dimensional accuracy and interchangeability
Professional Applications & Engineering Value
These 1/4"-20 UNC hex head screws deliver exceptional engineering value in industrial fastening applications where reliability is critical. The zinc-plated steel construction provides essential corrosion protection for machinery, structural frameworks, and outdoor equipment, significantly reducing maintenance costs. The coarse thread spacing ensures superior performance in softer materials and high-vibration environments, preventing loosening while enabling quicker assembly. With full threading along the entire 1 3/4" length, these screws maximize surface contact for enhanced load distribution in heavy-duty connections. The external hex drive accommodates high torque applications common in manufacturing, construction, and automotive industries, making them ideal for critical joints requiring repeated disassembly and reassembly.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse thread specifications for consistent performance. Complies with ASME B18.2.1 dimensional standards and ASTM A307 material specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for industrial use.
