S-91309A560 1/4"-20 x 4 1/2" 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, heavy-duty fastening for critical applications
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- UNC coarse threading allows for faster installation and better performance in softer materials
- Class 2A thread fit ensures consistent, reliable engagement and ease of assembly
- Fully threaded design offers maximum grip and holding power along the entire length
- External hex drive enables high-torque installation with standard tools for efficient maintenance
Professional Applications & Engineering Value
These heavy-duty hex head screws are engineered to solve critical fastening challenges in industrial applications where vibration resistance and long-term reliability are paramount. The high-strength steel construction combined with zinc plating provides exceptional corrosion protection, making them ideal for outdoor equipment, machinery frames, and structural assemblies exposed to harsh environments. The UNC coarse thread design ensures quick installation and superior performance in materials prone to stripping, while the fully threaded configuration maximizes load distribution. Meeting ASME B18.2.1 and ASTM A307 standards, these screws deliver consistent quality and performance for construction, manufacturing, and maintenance applications requiring dependable industrial fasteners.
Specification Summary & Compliance
This 1/4"-20 x 4 1/2" hex head screw features Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and reliable assembly. Manufactured to ASME B18.2.1 specifications using ASTM A307 grade steel, it delivers consistent mechanical properties and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental safety requirements for industrial use worldwide.
