Dieter Schmid's Fine Tools
Colt MaxiCut® Forstner Bits

Colt MaxiCut® Forstner Bits

With these forstner bits you can remove a lot of material quickly and easily. The cutting edges are durable and they can be easily resharpened.

The new cutting head design combines the advantages of a Forstner bit with those of a saw-tooth bit. It is designed for flexibility, machining half, slanted, overlapping, and deep holes. The chip breaker on the main cutting head, in combination with the patented, edged, center point, helps to reduce the overheating problems so common with these bits and so adds greatly to the working life. The manufacturer tested these bits by making over 1,000 test holes in Bongossi wood, known for its extreme hardness, with a 35 mm bit. After this test, the edge was slightly worn. But after sharpening, it passed the same 1,000-hole test.

The Colt MaxiCut bits work well many materials:
  • All species of hardwoods, even extremely hard tropical woods
  • All species of softwoods
  • Endgrain
  • MDF-board
  • Factory veneered laminated woods
  • Corian
  • Pertinax
You can use Colt MaxiCut® bits in these machines:
  • Hand-held electric drills
  • Drill presses
  • Dedicated production machines
  • CNC-production machines

The design of the shaft helps to eliminate problems with the bit turning in the chuck when drilling in hard or tough materials. The ROTASTOP® wave shaft All Colt MaxiCut® Forstner bits come with this feature. This wave form provides another big advantage: the extension shafts are machined to match the bit shafts. This means they cannot turn, they are automatically centered exactly and they need no set screws. In theory, the shafts can be combined to make any length you want. For available sizes see lower down on this page.

Accuracy according to ISO tolerance system H12, eg, bits 18 - 30 mm -0.21 mm, bits 30 - 40 mm -0.25 mm

Video: Colt Forstnerbit MaxiCut (15 MB)
Video: Sharpening Colt Forstnerbit MaxiCut (15 MB)

Colt MaxiCut® Forstner Bit Colt MaxiCut® Forstner Bit
The bit features the patented edged central point, a chip breaker on the main cutter, and ROTASTOP® waved shaft

Recommended Drill Speed:
900 - 3000 RPM, depending on material and bit head diameter. To profit fully from the design of the MaxiCut, you need to run the bit at relatively high RPMs. If in doubt, try to speed up the bit!

Drilling depth: Total length minus shaft length!

Total length
Shank length
16 10 90 30
Code 318016CartPrice € 22.60
18 10 90 30
Code 318018CartPrice € 24.50
19 10 90 30
Code 318019CartPrice € 24.90
20 10 90 30
Code 318020CartPrice € 24.90
Diameter Shank Total length Shank length CodePrice
25.4 (1 inch) 10 90 30
Code 318258CartPrice € 29.50
26 10 90 30
Code 318026CartPrice € 28.50
43 10 90 30
Code 318043CartPrice € 62.00
44 10 90 30
Code 318044CartPrice € 62.00
48 10 90 30
Code 318048CartPrice € 67.50
50 10 90 30
Code 318050CartPrice € 67.50
54 10 90 30
Code 318054CartPrice € 98.50
Colt RotaStop® Extension Shaft
Colt RotaStop® Extension Shaft
These extension shafts use a socket precisely shaped to fit over the ROTASTOP® wave form of the Colt MaxiCut bits. The high tolerance of the fit between the two pieces guarantees an optimal transmission of torque to the bit, eliminating the chance of slippage. The join between the extension and bit is bombproof and automatically 100% centered, minimizing wobble, without the need for fiddling with a set screw. The MaxiCut® extension shafts can in theory be used together to achieve any desired length. To loosen the extension after long use, you will need an 11 mm open-ended wrench. These extension shafts can only be used with the MaxiCut® forstner bits with the RotaStop® shaft configuration!
More on the RotaStop Principle

The outer diameter of the extension shafts is 14 mm, and the diameter of the RotaStop shaft is 10 mm. So the extension shafts require a minimum bit head diameter of 15 mm to be used.

Extension 90 mm with bit 35 mm
Bit 35 mm with 2 Extensions

Colt RotaStop® Extension 90 mm
Code 318200CartPrice € 22.50

Colt RotaStop® Extension 270 mm
Code 318202CartPrice € 31.50
Colt Morse Taper for RotaStop®
Colt Morse conical shaft for RotaStop® Forstner Bits
For stationary machines!
These Morse conical shaft extentions in principle function the same as the other shafts described above. To loosen the Morse conical shafts after some use, you will need both an 11 mm open ended wrench and a 10 mm open-ended wrench on the bit shaft. These Morse conical shafts will work only with the MaxiCut forstner bits with the RotaStop shafts!

Colt Morse Taper MK1 for RotaStop®
Code 318210CartPrice € 39.80

Colt Morse Taper MK2 for RotaStop®
Code 318211CartPrice € 44.50

Colt Morse Taper MK3 for RotaStop®
Code 318212CartPrice € 52.90
Colt MaxiCut® Forstner Bits
Set includes 5 Bits and 1 Extension

MaxiCut® 15, 20, 25, 30, 35 mm
1 Extension 90 mm
Comes in foam box

Code 318197CartPrice € 149.00
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