S-91771A741 4-48 x 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision thread engagement through Class 2A fit and UNF fine threading ensures secure, vibration-resistant connections
- Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Efficient installation using Phillips No. 1 drive system for quick, secure torque application
- Full-threaded design provides maximum grip length and uniform stress distribution across the entire fastener
- Regulatory compliance meets ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This 4-48 UNF flat head machine screw delivers critical performance advantages in precision assembly applications where material compatibility and thread reliability are paramount. The passivated 18-8 stainless steel construction provides excellent resistance to oxidation and chemical exposure, making it suitable for electronics, instrumentation, and marine environments. The UNF fine threading with Class 2A fit ensures superior vibration resistance in dynamic applications, while the 82° countersink angle creates a flush surface finish that eliminates protrusions in tight spaces. The combination of 80,000 psi tensile strength and fully threaded design provides exceptional clamping force distribution, preventing joint failure in high-stress industrial assemblies.
Specification Summary & Compliance
Manufactured to exacting dimensional standards with Class 2A thread fit tolerances and UNF fine thread specifications. Complies with ASME B18.6.3 mechanical standards for dimensional accuracy and performance. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance for hazardous substance restriction and REACH (EC 1907/2006) compliance for chemical safety. The 1/4" length and standardized 82° countersink angle ensure consistent performance across industrial applications.
