S-91253A985 1 1/4"-7 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Black-oxide alloy steel construction with Rockwell C37 hardness resists wear and corrosion in demanding industrial environments.
• Superior Tensile Strength: 130,000 psi tensile strength ensures reliable performance under high-stress and heavy-duty fastening applications.
• Precision Thread Fit: Class 3A UNC coarse threads provide a secure, tight fit with excellent vibration resistance and reduced risk of stripping.
• Efficient Installation: 7/8" hex drive allows for high-torque application with standard tools, speeding up assembly and reducing labor time.
• Optimal Flush Mounting: Standard flat head with an 82° countersink angle sits flush with surfaces, ideal for applications requiring a smooth finish.
• Full Thread Engagement: Fully threaded 3" length offers maximum grip and holding power across the entire fastener.
• Regulatory Compliance: Meets ASTM F835 specifications and is RoHS 3 & REACH compliant, ensuring safety and environmental standards for global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws solve critical fastening challenges where strength and reliability are paramount. The Class 3A UNC coarse thread design ensures superior vibration resistance, making them ideal for machinery, structural assemblies, and equipment subjected to dynamic loads. The 82° countersink angle and flat head profile allow for a seamless, flush finish, preventing snagging and improving safety in automated systems. With a 7/8" hex drive, installation is efficient, reducing downtime in high-volume production environments. The combination of 130,000 psi tensile strength and full threading provides consistent clamping force, essential for maintaining integrity in construction, manufacturing, and automotive sectors.

Specification Summary & Compliance

This screw features precise Class 3A thread fit with 1 1/4"-7 UNC coarse threads and a 3" fully threaded length. Manufactured to ASTM F835 specifications, it ensures dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting stringent environmental and safety standards for industrial use.