S-91772A948 5/16"-18 x 4 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 rated at 70,000 PSI for reliable performance in heavy-duty applications
- Precision Class 2A thread fit ensures smooth assembly and consistent fastening reliability
- Optimized partial threading provides superior grip and clamping force where needed most
- Standard Phillips No. 4 drive enables efficient installation with common tools
- Comprehensive compliance with ASME B18.6.3 standards plus RoHS 3 and REACH environmental regulations
- Durable Rockwell B70 hardness maintains structural integrity under repeated stress and vibration
Professional Applications & Engineering Value
These 5/16"-18 UNC partially threaded screws deliver critical engineering advantages in demanding industrial settings. The passivated 18-8 stainless steel construction provides exceptional corrosion resistance, making them ideal for applications exposed to moisture, chemicals, or outdoor elements. The coarse UNC threading combined with Class 2A fit ensures rapid assembly and reliable fastening in materials where fine threads might strip or fail. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening under vibration while the rounded pan head with Phillips drive offers secure tool engagement and a finished appearance. These characteristics make them particularly valuable in machinery assembly, structural frameworks, and equipment manufacturing where corrosion-resistant fasteners must maintain integrity under continuous operational stress.
Specification Summary & Compliance
This 4 1/2" partially threaded screw features precision 5/16"-18 UNC coarse threading with Class 2A thread fit tolerance for consistent assembly performance. Manufacturing adheres to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, meeting the latest compliance standards as of June 2023.
