S-91772A703 1/4"-20 x 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
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Excellent hardness (Rockwell B70) provides superior wear resistance and extended service life
• Optimized drive engagement with Phillips No. 3 drive for efficient installation and reduced cam-out
• Precise UNC coarse threading (Class 2A fit) enables quick assembly and secure fastening in various materials
• Versatile partial threading design allows for both clamping and alignment functions in assembly applications
• Comprehensive regulatory compliance including RoHS 3 and REACH for global market acceptance

Professional Applications & Engineering Value

This 1/4"-20 x 4" passivated 18-8 stainless steel rounded head screw delivers exceptional engineering value across multiple industrial sectors. The pan head profile with standard rounded contour provides optimal bearing surface while the Phillips No. 3 drive ensures secure tool engagement during high-torque applications. The UNC coarse thread pattern combined with Class 2A thread fit guarantees reliable performance in metals, plastics, and composite materials. Engineered for machinery assembly, electrical enclosures, and structural frameworks, these partially threaded screws offer both clamping force and alignment precision. The passivated surface treatment on the 18-8 stainless steel base material provides superior protection against chemical exposure and atmospheric corrosion, making them ideal for food processing equipment, marine applications, and outdoor installations where durability and regulatory compliance are paramount.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerance with UNC 1/4"-20 coarse threading and partial threading up to 1½" minimum thread length. Manufactured in compliance with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant regarding substance restrictions, ensuring environmental responsibility and global market acceptance for industrial fastener applications.