S-91236A548 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, extending service life in demanding 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
- Class 2A thread fit offers consistent, reliable assembly with standard nuts and tapped holes
- Coarse UNC threading enables faster installation and reduced cross-threading risks
- External hex drive design allows for high torque application with common tools
- Partial threading provides optimal grip length while maintaining unthreaded shank strength
Professional Applications & Engineering Value
These 1/4"-20 UNC hex head screws deliver exceptional engineering value for industrial assembly applications where vibration resistance and structural integrity are critical. The steel construction with zinc plating provides reliable corrosion protection in manufacturing environments, while the coarse thread design ensures rapid installation without compromising joint security. The partially threaded configuration offers superior clamping force distribution, making these hex head screws ideal for machinery assembly, structural frameworks, and equipment manufacturing where ASME B18.2.1 compliance is required. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures these fasteners maintain integrity under dynamic loads and repeated stress cycles.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with ASTM A307 material standards, these screws feature Class 2A thread fit tolerance for consistent mating performance. The 1/4"-20 UNC coarse thread configuration ensures reliable engagement, while the 1-3/4" length with 3/4" minimum thread length provides optimal fastening capability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict regulatory adherence.
