IGM M142 is a set of 2 carbide router bits (HW) for making V-shaped tongue-and-groove joints, designed for laying wooden floors and wall cladding. Cutting diameter 50.8 mm, 12 mm shank, cutting height 29.65 mm. Compatible with panel thicknesses from 19.05 to 25.4 mm. For use on router tables and CNC machines. Distributed in Italy by Krollit, official IGM distributor since 2007.
- Set contents: 2 router bits, tongue and groove
- Cutting diameter: 50.8 mm
- Cutting height: 29.65 mm
- Shank: 12 mm
- Compatible panel thickness: 19.05–25.4 mm
- Bearing: included, diameter 15.8 mm
- Possibility to mount an additional bearing on the shank with a stop collar
- Recommended use with parallel fence on router table
- Cutting edge material: micro-grain HW carbide, hardness 93.5 HRA, thickness 2 mm
- Red PTFE Teflon coating: protection against corrosion, resin and burn marks
- Anti-kickback technology compliant with EN 847
- Laser-marked shank with parameters and “K” point for optimal positioning in the collet
- Use: router table and CNC — not suitable for portable handheld router
Who uses the M142 and what it is used for
The IGM M142 series is used by wooden floor installers, manufacturers of wall cladding panels and carpenters who make tongue-and-groove joints on a router table. The two bits in the set work as a pair: one bit produces the tongue profile, a protruding V-shaped tongue, while the other produces the groove profile, a V-shaped groove, ensuring precise fitting between boards. Compatibility with thicknesses from 19.05 to 25.4 mm covers the most common flooring boards and cladding panels. The set also allows more elaborate joints to be created with multiple passes, combining the two profiles in different sequences to obtain more complex joint geometries.
Krollit logistics and support
Shipping in 3–5 working days from the Krollit warehouse in Monteforte Irpino (AV). Technical support in Italian at +39 0825-1494022.
Who the M142 is suitable for
| Profile | Compatibility | Reason |
|---|
| Wooden floor installer and manufacturer | Suitable | Produces V-shaped tongue-and-groove joints on boards from 19.05 to 25.4 mm thick |
| Carpenter with router table and parallel fence | Suitable | The manufacturer recommends use with a parallel fence on a router table for repeatable results |
| Operator with portable handheld router | Not suitable | 50.8 mm diameter and 12 mm shank require a router table or CNC — handheld use with bits of this diameter is neither safe nor recommended |
Not suitable for: laminate, plastic and artificial stone — the compatible materials declared by the manufacturer are softwood and hardwood, glued wood, plywood and MDF.
IGM technology and build quality
The micro-grain carbide cutting edges are brazed and sharpened on 5-axis CNC centers with automatic balancing. Hardness is 93.5 HRA, thickness 2 mm. The increased thickness allows multiple resharpening cycles without loss of quality. The red PTFE Teflon coating reduces friction and protects against resins and adhesives. Each router bit passes an automated quality control that detects deviations from the required parameters. The anti-kickback technology complies with the European EN 847 standard.
Technical specifications
| Set contents | 2 router bits, tongue and groove |
| Cutting diameter (D) | 50.8 mm |
| Cutting height (I) | 29.65 mm |
| Total length (L) | 81 mm |
| Shank (S) | 12 mm |
| Compatible panel thickness | 19.05–25.4 mm |
| Included bearing | Yes, Ø 15.8 mm |
| Number of cutting edges (Z) | 2 |
| Geometry | Straight cutting edge |
| Rotation | Clockwise, right-hand rotation |
| Cutting edge material | Micro-grain HW carbide |
| Cutting edge hardness | 93.5 HRA |
| Cutting edge thickness | 2 mm |
| Coating | Red PTFE Teflon |
| Anti-kickback | Yes, compliant with EN 847 |
| Shank marking | Laser: code, D, I, S, max RPM, K point |
| Packaging | Resealable case with specification label |
| Workable materials | Softwood and hardwood, glued wood, plywood, MDF |
| Use | Router table and CNC — use with parallel fence recommended |
Frequently Asked Questions
How does the M142 tongue-and-groove set work: are the two bits used in sequence?
Yes. The two bits work as a pair: the first bit cuts the tongue profile, the protruding V-shaped tongue, on one edge of the board; the second bit cuts the groove profile, the V-shaped groove, on the edge of the adjacent board. The two boards fit together by joining tongue and groove. The operation requires two separate passes, one for each profile type, with adjustment of the parallel fence between the two passes.
Does the set work on boards of any thickness?
The M142 set is sized for panel thicknesses from 19.05 to 25.4 mm, corresponding to the most common flooring boards and wall cladding panels. For thicknesses outside this range, the joint is not correctly centered and loses precision.
Is it mandatory to use the parallel fence on the router table?
The manufacturer recommends use with a parallel fence on a router table. The fence ensures that each pass is parallel to the edge of the board and that the routing depth is repeatable on all pieces. Without a fence, the risk of variation between pieces increases, compromising the precision of the final joint.
Can the M142 set also be used on CNC?
Yes, the M142 is compatible with CNC routers. The 12 mm shank is standard on benchtop CNC spindles. The laser marking on the shank includes the recommended maximum RPM as a reference for programming the spindle speed.
Can the bits in the set be resharpened separately?
Yes. Each bit in the set can be individually resharpened at a specialized center. The HW cutting edges are 2 mm thick, sufficient for multiple cycles. After resharpening, it is necessary to check that the tongue and groove still fit correctly, since removing material from the cutting edge slightly changes the profile dimension.
Is the included bearing used for template work?
The 15.8 mm diameter bearing is included in the set and can be used to follow a template. Alternatively, an additional bearing can be mounted on the shank with a stop collar, not included, or a guide bushing can be used on a handheld router, although handheld use is not recommended for bits of this diameter.
