S-91770A117 4-40 x 1 1/4" 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 from passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Enhanced load distribution with wide truss head design that reduces surface pressure and prevents material damage
- High tensile strength of 70,000 psi ensures reliable performance under substantial mechanical stress
- Rockwell B70 hardness provides excellent durability and resistance to wear during repeated use
- Full threading with Class 2A fit offers consistent engagement and secure fastening across the entire length
- No. 1 Phillips drive enables efficient installation with standard tools while minimizing cam-out risks
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards are met
Professional Applications & Engineering Value
These 4-40 UNC coarse thread screws with rounded truss head design are engineered to address common industrial fastening challenges. The passivated 18-8 stainless steel provides exceptional corrosion resistance, making them suitable for applications exposed to moisture, chemicals, or outdoor conditions. The wide truss head distributes clamping force over a larger area, preventing damage to softer materials and maintaining structural integrity. With full threading and Class 2A thread fit, these screws ensure maximum thread engagement and vibration resistance in assemblies ranging from electronic enclosures to machinery components. The No. 1 Phillips drive facilitates quick installation while the coarse UNC thread provides rapid advancement in various materials.
Specification Summary & Compliance
This screw features 4-40 UNC coarse threads with Class 2A thread fit for precise dimensional accuracy. Manufactured to ASME B18.6.3 specifications, it ensures consistent quality and performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. With 1-1/4" length and fully threaded design, it meets industrial standards for reliability and safety in professional applications.
