S-91772A904 3-56 x 5/8" 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 from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
- Exceptional tensile strength rated at 70,000 psi for secure fastening in high-stress applications
- Precision fine threading with Class 2A fit provides superior vibration resistance and consistent clamping force
- Optimized drive engagement with Phillips No. 1 drive style for efficient installation and reduced cam-out risk
- Full threading design maximizes grip length and load distribution across the entire fastener
- Comprehensive compliance with ASME B18.6.3 manufacturing standards and environmental regulations including RoHS 3 and REACH
- Consistent hardness at Rockwell B70 maintains dimensional stability under mechanical stress
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 reliable fastening are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making these rounded head screws ideal for marine, chemical processing, and outdoor equipment applications. The fine thread configuration ensures superior vibration resistance compared to coarse threads, while the fully threaded design maximizes surface contact for enhanced load distribution. With their Phillips No. 1 drive and standardized pan head profile, these fasteners offer efficient installation in confined spaces while maintaining consistent torque transmission. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these screws maintain structural integrity in demanding mechanical assemblies.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with precision Class 2A thread fit tolerance for consistent performance. Features UNF fine threading (3-56) with right-hand thread direction and inch system measurements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The fully threaded design maintains uniform engagement characteristics throughout the entire 5/8" length for reliable fastening performance.
