Purpose-built for clean top-edge plastic machining, this Plastic Down Spiral Router Bit is optimised for acrylic, PVC, polycarbonate and HDPE. The single-flute down-cut geometry pushes the material into the bed, helping reduce lifting, vibration, and top-edge chipping. With a cutting size of 4mm × 12mm, it’s a strong choice for sheet work, profiles, shallow pockets, and jobs where the visible top edge matters. Key benefits Clean top-edge finish helps reduce chipping and breakout on the visible face of plastic sheets. Polished cutting edge supports smoother cutting and helps reduce heat build-up in plastics. The single-flute design helps manage heat and chip load, reducing melting, gumming, and re-welding. Down-cut geometry improves material hold-down, helping keep thin sheets flatter during routing. High-quality carbide for rigidity and accuracy—less deflection and better edge control. .atlas-spec-table-wrap { padding: 5px; margin: 30px 0 0; border: 1px solid #000; border-radius: 16px; overflow: hidden; background: #161616; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5); } .atlas-spec-table { width: 100%; border-collapse: separate; border-spacing: 0; border: 0; margin: 0; background: transparent; } .atlas-spec-table th { background: #dca101; color: #000000; text-align: left; padding: 14px 16px; font-size: 14px; font-weight: 800; } .atlas-spec-table th:first-child { border-top-left-radius: 12px; border-right: 1px solid rgba(0,0,0,0.2); } .atlas-spec-table td { padding: 14px 16px; border-top: 1px solid rgba(255,255,255,0.08); } .atlas-spec-table td:first-child { width: 42%; border-right: 1px solid rgba(255,255,255,0.08); color: #f2f2f2; font-weight: bold; } .atlas-spec-table td:last-child { color: #d6d6d6; } .atlas-spec-table tbody tr:nth-child(odd) td { background: #1f1f1f; } .atlas-spec-table tbody tr:nth-child(even) td { background: #161616; } .atlas-spec-table th:first-child { border-top-left-radius: 12px; } .atlas-spec-table th:last-child { border-top-right-radius: 12px; } Spec Result Diameter 4mm Cut Length 12mm Shank (Collet Size) 4mm Overall Length 38mm Flutes 1 Cut Direction Down Spiral / Down-Cut Coating None Down-cut geometry for clean top-edge results The down-spiral flute pushes cutting pressure downward, helping hold the sheet against the spoilboard and protect the visible top surface. This is especially useful for plastic signs, panels, and components where a clean top edge is the priority. The single-flute design provides more chip space than multi-flute tools, helping control heat and reduce melting when routing acrylic, PVC, polycarbonate, and HDPE. Applications and benefits Ideal for sign makers, fabricators and CNC users cutting acrylic sheet, PVC foam board, polycarbonate, HDPE, and general plastics. The 4mm diameter gives extra strength over smaller 3.175mm tools, while the 12mm cut length suits thinner sheet work and controlled profiling where top-edge finish is critical.
