Accupro 71177356 Downcut Spiral Router Bit 1/4 in Solid Carbide

Product Description

The ACCUPRO 71177356 is a downcut spiral router bit machined from solid carbide for cutting plastics and composite solid-surface materials. The 0.25-inch cutter diameter pairs with a 1.25-inch length of cut and a matching 1/4-inch shank diameter, keeping the bit compatible with standard router collets. A 21-degree helix angle and single-edge geometry push chips downward, suppressing tearout on the top face of the workpiece. The bright, uncoated finish is well-suited to the low-friction demands of thermoplastic materials. Overall length is 3 inches. Weight is 0.07 pounds.

This bit is designed for routing a wide range of thermoplastic and solid-surface sheet goods. Intended material applications include ABS, acrylic, HDPE, HIPS, PE, PET, POM, PS, polycarbonate, polypropylene, UHMW, and solid surfaces. Typical uses include profiling, slotting, and through-cutting operations on CNC routers and handheld router setups where a clean, chip-free top surface is the priority. The right-hand cutting direction is standard for conventional CNC and handheld routing operations.

Key Features

• Downcut flute geometry reduces tearout and holds the workpiece surface clean during the cut
• Solid carbide construction provides hardness and wear resistance in abrasive plastic materials
• 21-degree helix angle optimized for chip evacuation in thermoplastics
• Single-edge router style allows high chip loads per tooth
• Bright uncoated finish minimizes heat buildup and material adhesion in plastics
• 1/4-inch shank diameter fits standard router collets without an adapter

Compatibility

Designed for use with standard 1/4-inch router collets on CNC routers and handheld routing equipment. Suitable for ABS, acrylic, HDPE, HIPS, PE, PET, POM, PS, polycarbonate, polypropylene, UHMW, and solid-surface materials as specified by the manufacturer.

Installation Notes

Install the shank fully into the collet to the manufacturer-recommended insertion depth before tightening. Power down and lock out the router spindle before changing bits. Inspect the cutting edges for chipping or wear before each use, as carbide can micro-chip if the bit contacts hard inclusions or fasteners in composite panels. Follow the tool manufacturer and applicable OSHA guidelines for router speed settings and workholding when cutting sheet plastics.