S-91771A552 1/4"-20 x 2 1/2" 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 long-term reliability.
- High tensile strength of 80,000 psi ensures secure fastening under heavy loads, reducing the risk of mechanical failure.
- Rockwell B80 hardness provides excellent durability and wear resistance for repeated use in industrial applications.
- Partially threaded design allows for precise clamping force control and prevents over-tightening in assemblies.
- Standard 82° countersink angle enables flush mounting for a clean, professional finish and improved aerodynamics.
- Class 2A thread fit with UNC coarse threading offers easy installation and reliable grip in a variety of materials.
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures consistent quality, safety, and environmental standards.
Professional Applications & Engineering Value
This 1/4"-20 UNC Flat Head Phillips Screw is engineered to address common industrial challenges such as vibration loosening and corrosion in demanding settings. Made from passivated 18-8 stainless steel, it provides exceptional resistance to moisture and chemicals, making it ideal for machinery, automotive, and outdoor equipment assemblies. The partially threaded design and coarse thread spacing enhance grip and distribute stress evenly, reducing the risk of strip-out in softer materials. With a Phillips No. 3 drive and standard flat head profile, installation is straightforward, ensuring efficient assembly lines and minimized downtime. These features make it a reliable choice for industrial fastening where strength, compliance, and longevity are critical.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse thread specifications for consistent performance. It meets ASME B18.6.3 manufacturing guidelines, ensuring reliable threading and head dimensions. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global industrial use.
