S-91309A535 1/4"-20 x 3/8" ASME B18.2.1, SAE J429 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 that protects against rust 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 during repeated installations
- UNC coarse threading with Class 2A fit enables faster assembly and reduced cross-threading risks
- Full threading along the entire 3/8" length maximizes grip strength and load distribution
- External hex drive design allows for high-torque installation with standard tools
- Compliance with major industry standards including ASME B18.2.1 ensures consistent quality and interchangeability
Professional Applications & Engineering Value
This 1/4"-20 x 3/8" hex head screw delivers exceptional engineering value for industrial fastening applications where reliability is critical. The zinc plated steel construction provides essential corrosion protection for machinery, equipment, and structural assemblies exposed to harsh environments. The UNC coarse threading combined with Class 2A thread fit ensures rapid installation while maintaining precise tolerances, significantly reducing assembly time in production lines. With full threading along its entire length, this screw offers superior clamping force distribution, making it ideal for applications requiring consistent load bearing across the fastened joint. The external hex drive accommodates high-torque applications, preventing tool slippage and ensuring secure fastening in automotive, construction, and heavy equipment applications where vibration resistance is paramount.
Specification Summary & Compliance
This hex head screw features precision UNC 1/4"-20 coarse threading with Class 2A thread fit tolerances for consistent performance. Manufactured to meet ASME B18.2.1 specifications and SAE J429 standards, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and safety standards for industrial use worldwide.
