S-91309A564 1/4"-20 x 5 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 harsh industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Coarse UNC threading with Class 2A fit provides quick assembly and secure fastening in various materials
- External hex head design allows for easy installation using standard wrenches, reducing labor time
- Full threading along the 5 1/2" length offers versatile grip range and consistent clamping force
- Compliance with ASME B18.2.1 and ASTM A307 standards guarantees dimensional accuracy and material quality
- Rockwell B69 hardness enhances durability and resistance to wear in demanding applications
Professional Applications & Engineering Value
This 1/4"-20 hex head screw is engineered to address common industrial fastening challenges, such as joint integrity under dynamic loads and environmental exposure. The steel construction with zinc plating provides a robust barrier against corrosion, making it ideal for outdoor machinery, structural assemblies, and equipment subjected to moisture or chemicals. The UNC coarse thread and Class 2A fit ensure rapid installation and reduced cross-threading risks, while the external hex drive facilitates high-torque applications without slippage. Commonly used in construction, automotive, and heavy machinery, this screw delivers reliable performance where high-strength fasteners are critical for safety and longevity, minimizing maintenance downtime and replacement costs.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit and UNC thread type with a size of 1/4"-20. It meets ASME B18.2.1 and ASTM A307 specifications for material and manufacturing consistency. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety and regulatory alignment for global industrial use.
