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Mortise & Slotter Chains & Parts

Our most popular products can be ordered directly. We can also supply specialized items and parts. Please call us for information or special orders at 1-800-350-8176.

About Mortise Chains

Mortise chain set with guide bar and sprocket

The term “mortise chain” often refers to the complete set composed of a chain, a guide bar and a sprocket, used to produce slots of different dimensions in wood.

The set is mounted on a mortising machine, either stationary or portable.

The stationary machines generally have a guide to sprocket with a so-called "E" center of 150 mm.

The portable machines generally have an "E" center of 70 mm.

However, there are many other mortising machines with different centers in operation.

Anatomy of the mortise

mortise dimensionsThe mortise is identified by three dimensions as shown in the figure at left:

  • Mortise width (W),
  • Mortise length (L),
  • Mortise depth (D).

Anatomy of a mortise chain

1. Chain pitches

The pitch is the distance between one pin in a link and the third successive one, as shown in the image below at right.

Chain pitches with dimensionsStandardized mortise or slotter chains are produced in the following three pitches:

  • “A” pitch (22,6 mm or .89"). Used for routine carpentry work.
  • “B” pitch (15,75 mm or .62"). Used for work requiring high levels of accuracy and precision.
  • “C” pitch (13,7 mm or .54"). Used for extremely precise work.

Other variations are possible.

Choose "A" type chains for most applications of routine mortise work with North American timbers.

Choose "B" pitch chains for work of higher level of accuracy and precision. This chain is less aggressive and susceptible to breaking under duress.

Choose "C" type only for extremely precise work.

2. Guide bars

mortise chain guide barsThe guide bar is the part of the set on which the chain glides as it penetrates the wood.

Our guide bars are of a length that allows the mounting of chains with a standard number of links.

All guide bars come with an unique, patented bar end, which is supplied already assembled and tested.

We supply guide bars of all shapes and sizes for stationary and portable mortising machines, for special applications with 1, 2, 3 and 4 bearings, and to fit the major automatic processing centres (Hundegger, Essetre, etc.) which make use of guide bars that can make mortises 500 mm deep, or even 600 mm and more.

3. Sprockets

mortise chain sprocketsThe sprocket is the third component part of the set. It is fixed to the motor shaft of the mortising machine and transmits the rotary movement to the chain. It is manufactured with specially formulated hardened steels.

Sprockets are available for each pitch of the chains:

  • for “A” pitch with 4 and 5 teeth (mortises 1-1/2". 40 and 50 mm long);
  • for “B” pitch with 6 teeth (mortises 30, 35 mm long);
  • for “C” pitch with 6 teeth (mortises 20 and 25 mm long).

The inner diameter of the sprockets is typically 16 mm (5/8") on heavy-duty portable or stationary mortisers, but on (Mafell in particular) it is 14 mm.The teeth of the sprockets are arranged on one, two or three ring gear crowns, depending on the thickness of the chain with which they have to be combined.

To find out which sprocket has to be used with a specific chain, you have to know the dimensions of the mortise to be made and the inner link size of the chain. The figures show the differences between the sprockets generally used for the different chain pitches.

In Praise of Cutting Chain Technology

Unfortunately, few wood-cutting chain makers are left in the world, as industry deemed this technology obsolete. But how else do you cut mortises into timber frames or mortises for making windows and doors? Or mortises into fence posts? Or even holes into solidly frozen ice?

While routers are often used, the are noisy, and produce a lot of dust. That is why we are seeing a resurgence of cutting chain technology.

Properly sharpened mortise chains outproduce any router or milling function.


Mortise Chainsets for Hema, Protool, SwissPRO etc.
Mortise Chainsets for Hema, Protool, SwissPRO etc.
$ 1840.00

Chainsets for Mafell Mortisers
Chainsets for Mafell Mortisers
$ 1860.00

Mortise chains
Mortise chains
$ 970.00

Bars for Chain Mortisers
Bars for Chain Mortisers
$ 890.00

$ 161.00

Slotter Chain Set
Slotter Chain Set
$ 1900.00

Slotter Chains
Slotter Chains
$ 820.00

Parts for Mortise and Slotter Chain Sets Available by Special Order
Parts for Mortise and Slotter Chain Sets Available by Special Order
Please call us at 1-800-350-8176 to order.
Chain Fitness chain lubricant
Chain Fitness chain lubricant
$ 12.00

Chain Sharpening Service
Chain Sharpening Service
Please call us at 1-800-350-8176 to order.
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