S-91770A559 1/4"-20 x 2 3/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws
Stainless Steel Truss 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 passivated 18-8 stainless steel, ensuring long-term reliability in harsh industrial environments.
- High tensile strength of 70,000 psi and Rockwell B70 hardness for dependable load-bearing performance in demanding applications.
- Wide rounded truss head design provides enhanced surface contact and reduces the risk of surface damage during installation.
- Phillips No. 3 drive offers excellent torque transmission and minimizes cam-out for efficient, secure fastening.
- UNC coarse thread with Class 2A fit ensures quick assembly and reliable thread engagement in various materials.
- Partially threaded shank allows for precise clamping force control and prevents over-tightening in sensitive assemblies.
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
This 1/4"-20 UNC coarse thread screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The passivated 18-8 stainless steel construction provides excellent resistance to oxidation and chemical exposure, making it ideal for outdoor equipment, marine hardware, and food processing machinery. The rounded truss head distributes pressure evenly, reducing the risk of surface indentation on softer materials, while the Phillips No. 3 drive ensures consistent torque application. With a partially threaded design, it offers optimal grip length for secure fastening in assemblies where full threading is unnecessary, enhancing efficiency in automotive, electronics, and structural applications.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy and easy assembly. It meets ASME B18.6.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
