S-91770A116 4-40 x 7/8" 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 load distribution through the wide truss head design, reducing surface pressure and material damage
- High tensile strength of 70,000 psi ensures reliable performance under significant mechanical stress
- Optimized driving efficiency with Phillips No. 1 drive, providing secure tool engagement and reduced cam-out risk
- Precise coarse threading (UNC) with Class 2A fit enables quick installation and excellent holding power
- Full threading along the 7/8" length allows maximum adjustability and consistent fastening depth
- Exceptional durability backed by Rockwell B70 hardness, maintaining integrity through repeated use
Professional Applications & Engineering Value
These 4-40 UNC rounded truss head screws deliver critical engineering advantages in demanding applications. The passivated 18-8 stainless steel construction provides exceptional resistance to oxidation and chemical exposure, making them ideal for industrial fastening in manufacturing equipment, electronic enclosures, and outdoor machinery. The unique wide truss head profile distributes clamping force over a larger surface area, preventing surface damage to softer materials while maintaining secure connections. With their coarse thread design and fully threaded 7/8" length, these screws ensure rapid assembly and reliable performance in vibration-prone environments where maintaining torque integrity is essential.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNC coarse threading (4-40 size) and right-hand thread direction. These screws conform to ASME B18.6.3 manufacturing specifications and demonstrate compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet international standards for industrial use and material safety.
