S-91772A941 1/4"-28 x 5/16" 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 load-bearing performance
• Precision thread engagement through Class 2A thread fit and UNF fine threading, ensuring secure fastening in critical applications
• Optimized drive efficiency with Phillips #3 drive design, reducing cam-out risks during high-torque installation
• Enhanced durability with fully threaded shank and rounded pan head profile, distributing stress evenly across assemblies
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental directives (RoHS 3, REACH)
• Versatile 5/16" length providing optimal grip range for medium-duty fastening requirements

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4-28 UNF pan head screws deliver critical performance advantages where vibration resistance and environmental durability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against corrosion in manufacturing, marine, and chemical processing environments. The UNF fine thread configuration maintains clamping force under dynamic loads, while the rounded pan head design offers superior clearance and aesthetic integration. With Phillips #3 drive compatibility, installation efficiency is maximized across assembly lines without compromising torque transmission. These fully threaded fasteners solve common engineering challenges including material degradation, thread stripping, and compliance documentation requirements.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and 1/4"-28 UNF fine thread specification. Complies with ASME B18.6.3 mechanical and dimensional requirements. Environmental compliance verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness with full threading along the 5/16" length.