S-91785A092 4-40 x 1/4" ASME B18.6.3 Stainless Steel Truss Head Slotted Screws
Stainless Steel Truss Head Slotted 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
- Enhanced corrosion resistance with 18-8 stainless steel construction and passivated finish for long-term reliability in harsh environments.
- Superior load distribution from the wide truss head design, reducing surface pressure and preventing material damage.
- High tensile strength of 100,000 psi ensures dependable performance under heavy mechanical stress and vibration.
- Easy installation and removal with a standard slotted drive, compatible with common hand tools for efficient assembly.
- Precise thread engagement through Class 2A fit and coarse UNC threading, providing secure fastening and reduced cross-threading risk.
- Full threading along the 1/4" length allows for adjustable grip depth and consistent holding power across applications.
- Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 4-40 UNC rounded truss head slotted screw is engineered to address common industrial fastening challenges, such as vibration loosening and corrosion-induced failure. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it ideal for electronics, machinery, and outdoor equipment. The wide truss head design distributes clamping force over a larger area, protecting sensitive surfaces and maintaining joint integrity. With a coarse thread and Class 2A fit, it ensures quick assembly and reliable performance in high-stress environments, reducing maintenance needs and downtime.
Specification Summary & Compliance
The screw features a 1/4" length with fully threaded #4-40 UNC coarse threads and Class 2A thread fit for precise dimensional accuracy. It meets ASME B18.6.3 specifications for slotted truss head screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
