S-91773A563 1/4"-28 x 1 1/4" 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 construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable, long-term performance
- Precision fine threading (1/4"-28 UNF Class 2A) ensures secure, vibration-resistant fastening in demanding applications
- Optimized drive engagement with Phillips No. 3 drive style for efficient installation and reduced cam-out risk
- Full threading along 1-1/4" length provides maximum grip and load distribution across the entire fastener
- Rounded head design offers a finished appearance while minimizing snagging in assembly operations
- Comprehensive compliance with ASME B18.6.3 standards and environmental regulations (RoHS 3, REACH) for global supply chain compatibility
Professional Applications & Engineering Value
This 1/4-28 UNF rounded head Phillips screw delivers critical engineering advantages where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material and passivated surface treatment creates a robust barrier against oxidation and chemical exposure, making it ideal for marine equipment, food processing machinery, and outdoor industrial applications. The fine UNF thread profile with Class 2A tolerance provides superior vibration resistance compared to coarse threads, preventing loosening in dynamic load conditions. With full threading along its entire 1-1/4" length, this fastener maximizes engagement depth in tapped holes, distributing stress evenly to prevent material fatigue and thread stripping in high-stress assemblies.
Specification Summary & Compliance
This precision-engineered rounded head screw features 1/4"-28 UNF fine threads manufactured to Class 2A thread fit tolerances for consistent engagement. The fastener complies with ASME B18.6.3 dimensional and mechanical specifications, ensuring interchangeability and performance reliability. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for global industrial supply chains requiring restricted substance control.
