Onsrud 63-774 Upcut Spiral Router Bit 0.25 in Solid Carbide

Product Description

The ONSRUD 63-774 is a single-edge upcut spiral router bit designed for cutting a wide range of thermoplastic and engineered polymer materials. Built from solid carbide with a bright uncoated finish, this bit features a 0.25 inch cutting diameter and a 21-degree helix angle that pulls chips upward and out of the cut, reducing heat buildup and improving surface finish in plastics. With a 0.375 inch length of cut and a 0.25 inch shank diameter, it is sized for compact routing applications where precision and clean chip evacuation are critical. It is installed by CNC machinists and fabricators working in production and job-shop environments.

This bit is specifically rated for use in ABS, acrylic, HDPE, HIPS, PE, PET, POM, PS, polycarbonate, polypropylene, solid surfaces, and UHMW. The upcut geometry makes it well suited for through-cuts and profiling operations where chip clearance from the workpiece surface is a priority. It is commonly run in CNC routers and handheld router setups where a 0.25 inch shank collet is used. The 63-774 belongs to the ONSRUD 63-750 series, which is optimized for single-flute, high-speed routing in thermoplastics.

Key Features

• Solid carbide construction for extended tool life in abrasive thermoplastic materials
• Single-edge upcut flute geometry promotes aggressive chip evacuation and reduces recutting
• 21-degree helix angle balances cutting efficiency with smooth surface finish in plastics
• Bright uncoated finish maintains sharp edge geometry without coating buildup on plastic materials
• Right-hand cutting direction compatible with standard CNC router spindle rotation
• Non-piloted design for full CNC or guided router table use

Compatibility

Rated for use in ABS, acrylic, HDPE, HIPS, PE, PET, POM, PS, polycarbonate, polypropylene, solid surfaces, and UHMW. Part of the ONSRUD 63-750 series. Requires a 0.25 inch collet or chuck.

Installation Notes

This bit is installed by CNC machinists or skilled router operators using a 0.25 inch collet. Before changing tooling, ensure the router spindle is fully powered down and the collet is clean and free of debris. Verify runout after installation using a dial indicator when precision surface finish is required. Follow the tool manufacturer feed and speed recommendations for the specific material being cut.