The I84 replaceable-insert spiral milling bit series is intended for CNC routers, engraving machines and vertical milling systems. The listed uses include trimming, slotting, contouring and surface planing in hardwood, MDF, plywood and composite panels.
Listed selection range
| Specification | Listed range or option |
|---|---|
| Cutter diameter | 40–60 mm |
| Cutting length | Up to 150 mm |
| Shank size | 12.7 mm or 20 mm |
| Cutter style | Replaceable-insert spiral; round-bottom option listed |
Choose the correct configuration
- Match the shank to the CNC holder or spindle collet.
- Choose the diameter and cutting length for the required clearance, depth and toolpath.
- Confirm whether the operation needs a flat-bottom, spiral or round-bottom result.
- Check the machine capacity, workholding and material before programming a production pass.
Test before machining
Secure the panel or workpiece, use a verified toolpath and begin with a test cut in matching scrap. Monitor chip evacuation, heat, vibration and edge finish. Replaceable inserts should be checked and tightened according to the tool instructions before use.
Product views

For a compatibility check, email sales@bitsrouter.com with the machine, holder, material, thickness, required cut and quantity.




















