S-91785A089 4-40 x 3/16" 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
- Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
- Exceptional load distribution through wide truss head design, reducing surface pressure and preventing material damage
- High tensile strength rating of 100,000 psi provides reliable performance in demanding mechanical applications
- Precision Class 2A thread fit ensures consistent engagement and reduces cross-threading risks during installation
- Fully threaded coarse UNC pattern delivers maximum holding power and faster installation in various materials
- Comprehensive regulatory compliance including ASME B18.6.3 standards and RoHS 3/REACH environmental directives
- Rockwell B100 hardness maintains thread integrity and prevents stripping under repeated use
Professional Applications & Engineering Value
This 4-40 UNC rounded truss head slotted screw delivers critical engineering advantages for industrial assembly applications. The 18-8 stainless steel composition combined with passivated finish provides exceptional resistance to corrosion and chemical exposure, making it ideal for manufacturing equipment, electronic enclosures, and outdoor machinery. The unique wide truss head design distributes clamping force over a larger surface area, preventing damage to softer materials while maintaining secure fastening. With fully threaded coarse UNC patterning and Class 2A fit, these screws offer reliable engagement in metal, plastic, and composite materials, reducing installation time while ensuring vibration resistance in high-stress environments.
Specification Summary & Compliance
This fastener features precision 4-40 UNC coarse threads with Class 2A tolerance for consistent fit and performance. Manufactured to ASME B18.6.3 specifications with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and regulatory adherence. The right-hand threaded design with fully threaded construction provides uniform engagement across the entire 3/16" length, meeting industrial quality standards for reliability and performance consistency.
