S-91770A552 1/4"-20 x 2 1/2" 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 construction, ideal for harsh industrial environments
- Enhanced clamping force from the wide truss head design, distributing load evenly and reducing surface damage
- Reliable fastening performance with Class 2A thread fit ensuring consistent engagement and vibration resistance
- High tensile strength of 70,000 psi and Rockwell B70 hardness for durable, long-lasting connections under stress
- Easy installation with Phillips No. 3 drive, providing secure tool engagement and reducing slippage
- Optimized for partial threading allowing precise grip control in assembly without unnecessary thread engagement
- Compliance with industry standards including ASME B18.6.3, ensuring quality and interchangeability in mechanical systems
Professional Applications & Engineering Value
This 1/4-20 UNC partially threaded rounded truss head screw is engineered to address common industrial challenges, such as corrosion in moist or chemical-exposed settings, thanks to its passivated 18-8 stainless steel material. The coarse thread and Class 2A fit provide quick assembly and reliable hold in materials like metal or plastic, reducing the risk of stripping. With a wide truss head profile, it offers superior load distribution, preventing surface indentation and enhancing structural integrity in applications like machinery, automotive assemblies, and electrical enclosures. The Phillips drive ensures efficient installation, making it a go-to choice for maintenance and production lines where speed and durability are critical.
Specification Summary & Compliance
This screw adheres to precise dimensional tolerances, including a Class 2A thread fit per UNC standards and a length of 2-1/2" with partial threading. It meets ASME B18.6.3 specifications for consistency and safety. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global industrial use.
