S-91249A726 1/4"-20 x 3 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and black-oxide coating for long-lasting performance in harsh environments
• Superior load-bearing capacity with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Reliable fastening engagement through fully threaded UNC coarse threads and Class 2A fit ensuring consistent clamping force
• Optimized drive efficiency with No. 3 Phillips drive and pan head design for secure installation and reduced cam-out risk
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries
• Versatile 3-1/2" length providing ample thread engagement for thick material assemblies

Professional Applications & Engineering Value

Engineered for industrial applications where corrosion resistance and structural integrity are paramount, these black-oxide 18-8 stainless steel pan head screws deliver exceptional performance in demanding environments. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures reliable fastening in heavy machinery, construction equipment, and marine applications where vibration and stress are constant challenges. The fully threaded UNC coarse thread design provides superior pull-out resistance in wood, plastic, and metal assemblies, while the No. 3 Phillips drive and rounded pan head profile enable efficient installation without compromising aesthetic requirements. These industrial screws maintain their protective black-oxide finish even under extreme conditions, making them ideal for outdoor equipment, automotive components, and electrical enclosures exposed to moisture and chemicals.

Specification Summary & Compliance

This 1/4-20 x 3-1/2" screw features Class 2A thread fit tolerance for precise engagement and follows UNC coarse thread standards with complete threading along the shank. Manufactured in compliance with ASME B18.6.3 mechanical specifications, the fastener ensures dimensional accuracy and interchangeability. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, making it suitable for global industrial applications requiring environmental compliance.