S-91773A554 1/4"-20 x 3" ASME B18.6.3 Stainless Steel Round Head Phillips Screws
Stainless Steel Round 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 18-8 Stainless Steel and passivated finish for extended service life in harsh environments
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable heavy-duty applications
- Optimized drive engagement through No. 3 Phillips drive for efficient installation and reduced cam-out risk
- Secure partial threading design provides controlled clamping force while minimizing thread damage
- Precision UNC coarse threading with Class 2A fit ensures quick assembly and consistent performance
- Rounded head profile offers improved aesthetics and reduced surface snagging in finished applications
- Full regulatory compliance with ASME B18.6.3 standards and RoHS/REACH environmental directives
Professional Applications & Engineering Value
These 1/4-20 UNC threaded screws deliver critical performance advantages for industrial applications where corrosion resistance and structural integrity are paramount. The 18-8 Stainless Steel construction with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for food processing equipment, marine components, and outdoor machinery. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening under vibration while the coarse thread spacing enables rapid installation in production environments. The rounded head profile with Phillips drive offers both aesthetic appeal and practical installation benefits, particularly in applications requiring frequent maintenance or disassembly.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. Features 1/4"-20 UNC coarse threads with right-hand direction and 3" overall length with partial threading. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
