S-91772A947 5/16"-18 x 2 1/4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable, heavy-duty fastening.
• Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring quick assembly and vibration resistance.
• Enhanced drive stability with No. 4 Phillips drive and rounded pan head design, reducing cam-out and improving torque application.
• Controlled fastening depth via partial threading, preventing over-tightening and material damage in precision assemblies.
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use.
• Versatile inch-dimension compatibility with 5/16"-18 thread size and 2-1/4" length, fitting standard North American equipment.

Professional Applications & Engineering Value

These passivated 18-8 stainless steel rounded head screws address critical industrial challenges where corrosion resistance and structural integrity are paramount. The UNC coarse thread design facilitates rapid installation in metal fabrications, machinery, and outdoor equipment, while the partial threading ensures precise clamp load distribution without compromising joint strength. Engineered with a Rockwell B70 hardness and 70,000 psi tensile strength, they withstand dynamic loads and stress cycles in automotive, marine, and construction applications. The Phillips drive and pan head profile provide secure tool engagement, minimizing slippage during high-torque assembly. Ideal for heavy-duty fastening in corrosive environments, these screws deliver long-term reliability while complying with international ASME B18.6.3 specifications.

Specification Summary & Compliance

This screw maintains Class 2A thread fit per UNC standards, ensuring consistent dimensional accuracy across batches. Manufacturing adheres to ASME B18.6.3 mechanical and dimensional requirements, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Critical dimensions include a 5/16"-18 coarse thread, 2-1/4" length, and 0.615" head diameter, all precision-machined from passivated 18-8 stainless steel for guaranteed performance.