PNZ Instructions

PNZ Pneumatic Notching Tool Operations Manual

METU Meinig AG has compiled this manual with care, but does not warrant that the information regarding the operating of the PNZ tool is comprehensive and free of errors. METU Meinig AG shall therefore not be held liable as a result of any inaccuracies or failing information. Text, graphics, photographs, specifications machinery and product features are subject to change without prior notification. It is recommended to wear protective gloves. In case of discrepancies between the versions, only the German prevails.

Carton Contents

1     Pneumatic Notching Tool (PNZ)

1     Head and punching lever

1     End cover

2     Stopping faces 7 mm

2     Stopping faces 9 mm

1     Sheet metal sample with notches

1     Hexagon socket screw key m6

1     Hexagon socket screw key m4

1     Hexagon socket screw key m2,5

1     Sickle Spanner 40-42

1     Oil syringe

1     Oil flask

1     Angle connection for pressurized air with sealer

1     Union joint

1     Union joint

1     Owner’s manual

About this Tool

This pneumatic-hydraulic notching tool allows to create notches into the duct wall. The tool can be used for all circular AF and BF duct flange sizes (AF and BF 20 - 160).

The case of the tool is made of a very solid plastic with light metal reinforcement and a screwed-in guiding device for the piston. The pneumatic cylinder tube is made out of steel. When wear and tear occurs, individual parts can be exchanged. They are easily accessible, so that repairs are not expensive and/or time-consuming. 

If used in horizontal position, the center of gravity of the tool is directly under the hand and therefore enables a more comfortable operation. Because of its very compact design and the special design of the hydraulic part, the handling of the notching tool is lighter.

The tool has a security valve. With an operating pressure between 6 to 6,5  bar the valve opens automatically and closes when the pressure is reduced.

The solid cutting head made of hardened steel allows to control the place of cutting visually. The lever is directly connected to the hydraulic piston by a threaded bolt. 

Because of a very good relation between the pneumatic and the hydraulic pistons, a force of 15 kN with a pressure of 6 bar is achieved. This force on the tie bolt is transferred by the lever mechanism and leads to a cutting force on both cutters of 18 kN. It allows a maximum sheet metal thickness of 1,5 mm for galv. steel, and 1,2 mm for stainless steel to be cut. The cutters are from hardened steel, and can be exchanged. If they are treated carefully they have a long life expectancy. The upper cutter can be re-sharpened, and the lower cutters can be turned four times.

Stopping faces on both sides of the cutting head enable the setting of the tool at a right angle and the correct distance from the notches to the end of the duct. These stopping faces have to be exchanged depending on the required distance between the notches and the duct wall. 

The depth of the notches has to be adapted to the sheet metal thickness. This can be done by regulating the M8 screw at the tie bolt which is seated at the front of the cutting head. The notches must not be deeper than the sheet metal thickness, otherwise the sealing lip of the flange will not work properly. Please read the following instructions carefully before using the notching tool.

Operating Instructions


Take the tool out of the package and connect it to a compressed-air supply. For a longer live of the pneumatic notching tool we recommend to install a compressed-air conditioner (filter and mist oiler) in the compressed-air piping as it is usually done for pneumatic tools. This tool has been designed to work with an air-pressure of 6,5 bar. By using this tool with higher pressure you run the risk of damaging it.  If the air pressure is higher than 6 bar a pressure reducer must be installed. It has to be regulated for a maximum pressure of 6,5 bar.


You should first check if the correct stopping faces are installed. If not, unscrew the two screws which fix the stopping faces on the cutting head. Take the correct stopping faces from the hopper on the end cover of the tool (no. 13 on the enclosed drawing) and install them on the cutting head. The other stopping faces should be replaced immediately in the hopper of the end cover, so they will not get lost.

Distance from the notches to the end of the duct (stopping face):

Stopping Faces:

AF and BF 20 - 45 (200 up to 499 mm duct Ø) : 7 mm    
AF and BF 50 - 90 (500 up to 999 mm duct Ø) :  9 mm    
AF and BF 100 - 160 (1000 up to 3000 mm duct Ø) : 15 mm (no stopping face used)

Stopping faces

Take a piece of sheet metal to test the notches. The thickness of the sheet metal should be the same as the thickness of the duct wall in which you want to make the notches. Hold the notching tool as shown hereafter:

Pay attention that both stopping faces fit closely to the duct wall. Pull the trigger. The upper cutter moves downwards and makes the notch. When you release the trigger, the cutter will go back into its original position.

Make sure that your other hand is away from the cutting head when pulling the trigger. Danger of injury!

Now check the depth of the notch. It should correspond exactly to the sheet metal thickness. If the notch is deeper, it will cut into the sealing lip of the flange. If the notch is not deep enough, there is a danger that, under load, the flange ring slips over the notches.

A)   End of round duct or fitting
B)   Duct wall thickness
C)   Distance accoring to the diameter (*)
D)   1 × the duct wall thickness (galv. steel = max. 1,5 mm, stainless steel = max. 1,2 mm)
E)   4 × the duct wall thickness
F)   Notches must protrude inside the duct !

Duct-Ø 200 to 499 mm : 7 mm
Duct-Ø 500 to 999 mm : 9 mm
Duct-Ø 1000 to 3000 mm : 15 mm

The exact depth of the notches can be regulated with the hexagonal socket screw at the front of the cutting head. If you turn the screw clockwise, the notch gets deeper; if you turn the screw counter-clockwise, the depth of the notches is reduced.

When the notching tool is regulated properly, you can start making notches into the duct wall at an interval of 80 mm for the medium and large flanges, and 30 to 50 mm for the smaller diameters. While working, you should check from time to time if the depth and the quality of the notches are appropriate.

Removal and Reshaping of the Cutters

With regular use the cutters have a long live. But if the notches do not show sharp edges anymore, the function of the notches is no more guaranteed and the cutters should be changed or re-sharpened.

To remove the upper cutter, just unscrew the flat headed screw and take off the cutter. If it is only slightly damaged, it can be reshaped. But if it is severely damaged, it must be replaced.

To remove the lower cutter, unscrew both straight pins and take off the cutter. The backing plate in the back should not be removed. It normally does not wear out and must not be reshaped.

The lower cutter may be turned four times. It can be easily reshaped with a surface grinding machine.

Care should be taken when reinstalling the cutters, making sure that there is no dirt between cutter and bearing surface.

Hydraulic Oil Refill

An air cushion may occur in the hydraulic system after some time, because of slight leakage at the seals. This is the case when the notching tool does not close completely. In order to refill the hydraulic oil from the oil bottle which is enclosed, take off the compressed-air supply. Then hold the tool in a horizontal position and take off the screw plug (40). Fill the hydraulic oil in the bore hole until it appears in the opening. You can now reinstall the screw and continue to work.

Technical Data

Operating air pressure : up to 6,5 bar
Cutting force : ≈ 18 kN with 6 bar
Air Consumption : ≈ 2,4 l per notch
Max. sheet metal thickness galv. steel: 1,5 mm
Max. sheet metal thickness stainless steel: 1,2 mm

Weight : ≈ 1,8 kg
Height : ≈ 342 mm
Length : ≈ 185 mm

PNZ Spare Parts

Ref. Art. No. Description Quantities
1 3823-0001 Main element MS 40-A 1
2 3823-0002 Head casing MS 40-A 1
3 G02V-1018 Pulling part MS40-A with screw socket and bolt 1
4 3823-0004 Liner MS40-A 1
5 3823-0003 Counter ring MS40-A 1
6 3826-0001 Punching lever MS40-A 1
7 0258-735N Threaded straight pin ISO 8735 D10 × 28 1
8 3823-0006 End cover MS40-A 1
9 3823-0007 Stopping faces 7 mm MS40-A 2
10 3823-0008 Stopping faces 9 mm MS40-A 2
11 3817-0001 Lower cutter MS40-A 1
12 3816-0001 Lower pressure plate MS40-A 1
13 3815-0001 Upper cutter MS40-A 1
14 M204-0219 Swiveling screw G ¼ 6 mm 74-046 1
15 0101-642N Hexagon socket countersunk head screw DIN 7991 - M4 × 10 2
16 0111-642N Hexagon socket countersunk head screw DIN 7991 - M4 × 12 1
17 0614-762N Hexagon socket head cap screw DIN 912 - M5 × 16 2
18 0091-642N Hexagon socket head cap screw DIN 7991 - M4 × 8 4

The head of the pneumatic notching tool has been especially designed by METU Meinig AG to create the notches for the METU AF and BF circular flanges. METU Meinig AG is therefore responsible for the  proper functioning of this specific part. The main element of the  pneumatic notching tool is manufactured by the  company Titgemeyer. Should you encounter any problems with this part thank you for contacting Titgemeyer directly.

Titgemeyer GmbH & Co. KG

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