S-94779A840 1/4"-20 x 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 18-8 stainless steel and black-oxide coating for extended service life in harsh environments.
- Exceptional holding power from 70,000 psi tensile strength and Rockwell B70 hardness, preventing stripping and failure under load.
- Wide bearing surface of the truss head design distributes clamping force effectively, reducing material stress and damage.
- Reliable and fast installation with No. 3 Phillips drive and coarse UNC threads, ensuring quick seating and reduced assembly time.
- Precise thread fit with Class 2A tolerance for consistent engagement and vibration resistance in demanding applications.
- Full threading along the entire 3/4" length provides maximum grip and adjustability in various material thicknesses.
- Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH for guaranteed quality and environmental safety.
Professional Applications & Engineering Value
This black-oxide 18-8 stainless steel truss head screw is engineered to solve critical fastening challenges in industrial settings. The combination of high tensile strength (70,000 psi) and corrosion-resistant coating ensures durability in moist or chemically aggressive environments, such as outdoor equipment, marine hardware, and electrical enclosures. The wide truss head offers a larger surface area than standard rounded heads, minimizing the risk of pull-through in softer materials like plastics or sheet metal. With its UNC coarse threads and Class 2A fit, it provides rapid installation and reliable performance in high-vibration applications, from machinery assembly to automotive components. This screw delivers consistent holding power and long-term reliability, reducing maintenance needs and downtime.
Specification Summary & Compliance
The screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional accuracy for precise fit and interchangeability. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.
