S-91247A554 1/4"-20 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength with 120,000 PSI rating ensures reliable performance in high-stress applications
• Enhanced corrosion resistance through zinc plating extends service life in demanding environments
• Precise Class 2A thread fit provides consistent engagement and reduces installation issues
• Grade 5 strength classification delivers optimal balance of hardness and durability for industrial use
• External hex drive design allows for high-torque installation with standard tools
• Coarse UNC threading enables faster assembly and better performance in softer materials
• Partial threading configuration offers superior clamping force where needed

Professional Applications & Engineering Value

These Grade 5 hex head screws are engineered to address critical fastening challenges in industrial settings. The zinc plated steel construction provides essential corrosion protection for machinery, equipment frames, and structural assemblies exposed to harsh conditions. The 1/4-20 UNC coarse thread design ensures rapid installation while maintaining secure connections in various materials. With Rockwell C25 hardness and 120,000 PSI tensile strength, these fasteners prevent thread stripping and maintain integrity under vibration and dynamic loads. The external hex drive accommodates high torque applications, making them ideal for automotive, construction, and manufacturing applications where reliability is paramount.

Specification Summary & Compliance

This 1/4-20 x 3" hex head screw features Class 2A thread fit tolerance and partial threading with minimum 3/4" thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 5 standards, ensuring dimensional accuracy and performance consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.