S-91770A115 4-40 x 1" 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 environments and extended service life
- Exceptional tensile strength rated at 70,000 psi provides reliable, high-load fastening for demanding applications
- Enhanced bearing surface from the wide truss head design distributes clamping force evenly, reducing material damage
- Optimized thread engagement with fully threaded UNC coarse pattern ensures maximum holding power and faster installation
- Precise Class 2A thread fit guarantees consistent performance and compatibility with standard nuts and tapped holes
- Broad compliance coverage meets ASME B18.6.3 specifications and environmental standards including RoHS and REACH
- Rockwell B70 hardness maintains thread integrity and drive durability under repeated use and vibration
Professional Applications & Engineering Value
These 4-40 UNC rounded truss head screws deliver critical engineering advantages in applications where corrosion resistance and structural reliability are paramount. The passivated 18-8 stainless steel material prevents oxidation in humid or chemical-exposed environments, while the coarse thread design provides superior pull-out resistance in softer materials and faster assembly cycles. The combination of 70,000 psi tensile strength and wide truss head profile solves common industrial challenges like joint loosening and surface marring, making them ideal for electronics enclosures, machinery panels, and automotive components requiring consistent Phillips drive performance and regulatory compliance.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 standards with Class 2A thread fit tolerances for precise interchangeability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. Thread specifications include 4-40 UNC coarse thread, right-hand direction, and 1" length with complete threading for uniform load distribution.
