S-91771A854 1/4"-20 x 1 3/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh environments and extended service life.
- High tensile strength of 80,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Rockwell B80 hardness provides excellent durability and resistance to wear and deformation.
- Fully threaded UNC coarse design offers faster installation and superior holding power in various materials.
- 82° countersink angle and flat head profile allow for a flush, secure fit that minimizes protrusion and improves safety.
- Class 2A thread fit guarantees consistent, precise engagement with standard nuts and tapped holes.
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to strict industrial and environmental standards.
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head Phillips screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and material fatigue. The passivated 18-8 stainless steel provides exceptional resistance to rust and chemical exposure, making it suitable for outdoor equipment, marine hardware, and food processing machinery. The coarse UNC threads and fully threaded design enhance grip in soft metals and plastics, reducing the risk of stripping. With a No. 3 Phillips drive, installation is straightforward, while the 82° countersink angle ensures a smooth, flush finish that prevents snagging and maintains aerodynamic or aesthetic surfaces in automotive, aerospace, and construction applications.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy and reliable performance. It is manufactured in accordance with ASME B18.6.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
