S-91772A053 3-56 x 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan Head Phillips Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional tensile strength of 70,000 psi ensures reliable fastening under high-stress conditions
- Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks
- Fully threaded design maximizes grip length and holding power across the entire fastener
- Fine UNF threading delivers enhanced vibration resistance and superior clamping force
- Standard pan head profile with Phillips No. 1 drive offers familiar installation and flush seating
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH ensures regulatory acceptance
Professional Applications & Engineering Value
These 3-56 UNF fine thread pan head screws deliver critical performance advantages in precision engineering applications where corrosion resistance and vibration management are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for marine, chemical processing, and food-grade equipment. The fine thread configuration creates more thread engagement points per inch, significantly improving resistance to loosening under dynamic loads while maintaining Class 2A precision tolerances for consistent assembly. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these fully threaded fasteners maintain integrity in high-stress applications, from precision instruments to electronic enclosures, where reliable fastening performance cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring precise engagement. The 3-56 UNF fine thread configuration maintains consistent pitch and diameter (0.099") throughout the 1/2" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and material transparency. The right-hand threaded design with Phillips No. 1 drive and standard pan head profile (0.193" diameter, 0.071" height) provides industry-standard installation compatibility.
