S-91644A821 Length 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced load distribution through the integrated stainless steel/rubber flat washer, preventing surface damage and loosening
• High-strength thread forming design (Type A/AB) creates durable, vibration-resistant threads in sheet metal without pre-tapping
• Efficient installation with external hex drive and fully threaded shank for maximum grip and faster driving
• Optimized for sheet metal applications with a pointed tip and compatibility for up to 0.025" drilling thickness using a standard 1/4" drill bit
• Precise dimensional fit with No. 17 size, 0.281" thread diameter, and 10 threads per inch ensuring reliable performance
• Versatile fastening solution combining a 3/4" length and flat washer for a wide range of assembly requirements

Professional Applications & Engineering Value

These thread forming tapping screws are engineered to address common challenges in sheet metal fabrication, such as material fatigue and joint failure. The 18-8 stainless steel composition provides excellent resistance to rust and oxidation, making them suitable for outdoor or corrosive environments. The external hex drive allows for high-torque application, ensuring secure fastening without stripping, while the fully threaded design maximizes pull-out strength. The integrated flat washer, made from a stainless steel and rubber combination, distributes clamping force evenly, reducing the risk of sheet deformation and improving seal integrity. This makes them ideal for HVAC systems, electronic enclosures, and automotive panels where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

This product adheres to standard inch measurements with a thread diameter of 0.281" and 10 threads per inch, conforming to typical industrial tolerances for thread forming screws. The A/AB tapping screw type is designed for right-hand threading and is compatible with a 1/4" drill bit for a maximum drilling thickness of 0.025". Manufactured from 18-8 stainless steel, these screws meet common industry standards for material quality and are compliant with RoHS and REACH environmental regulations, ensuring safe use in various industrial applications.