S-91771A561 1/4"-28 x 1" 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
- High tensile strength of 80,000 psi ensures reliable fastening under demanding mechanical loads
- Precision Class 2A thread fit guarantees smooth installation and secure connections in fine-thread applications
- Standard 82° countersink angle provides flush mounting for clean, professional finishes
- Phillips No. 3 drive design enables efficient installation with common tools while reducing cam-out risk
- Full threading along 1" length offers maximum grip and adjustment flexibility in assembly applications
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards ensures quality and environmental responsibility
Professional Applications & Engineering Value
These 1/4"-28 UNF flat head Phillips screws deliver exceptional engineering value in industrial settings where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides superior protection against rust and chemical degradation, making them ideal for manufacturing equipment, marine components, and food processing machinery. The fine UNF thread pattern with Class 2A fit ensures vibration-resistant fastening in precision assemblies, while the standard 82° countersink angle creates seamless surface finishes. With 80,000 psi tensile strength and Rockwell B80 hardness, these fully threaded fasteners maintain integrity under sustained mechanical stress, solving common failure points in heavy-duty applications.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for precision assembly. Features 1/4"-28 UNF fine threads with right-hand orientation and standard flat head profile (0.477" diameter, 0.153" height). Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
