Precision Boring Head SDJ 10-12 | 12-14 | 14-17 | 16-21 | 20-28

Kortools

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€112.83

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SDJ10-12 M5

SDJ12-14 M6

SDJ14-17 M6

SDJ16-21 M8

SDJ20-28 M10

SDJ25-47 M12

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Product description

SDJ fine boring head

Modular finish boring · manual fine adjustment · indexable cutting inserts

The SDJ head is designed for precision finishing of bores. Diameter is set with a graduated adjustment dial, while an indexable insert provides the cutting edge. Select the head by its boring range, mounting interface and insert system.

1. Application and construction

Component	Function
SDJ head	Precision finish boring within the range of the selected head.
Steel body	Heat-treated body with an adjustment mechanism.
Graduated dial	Manual fine adjustment of cutting-edge position, read as a change in diameter.
Indexable insert	Separate cutting component selected to fit the insert seat.

2. Ranges and dimensions of threaded heads

Range [mm]	Thread	Working L [mm]	Insert
Ø10–12	M5	27	TB0601
Ø12–14	M6	35	TP0902
Ø14–17	M6	38	TP0902
Ø16–21	M8	38	TP0902
Ø20–28	M10	41	TP0902

L is the working-section length shown on the card, excluding the threaded connection. The boring range describes the machined bore diameter; it is neither the mounting-thread diameter nor the total tool length. Select the required size in the product selector and check its dimensional card.

3. Mounting and designation

Designation	Meaning
SDJ	Our designation for this fine boring head family.
10–12, 12–14…	Boring diameter range in millimetres.
M5 / M6 / M8 / M10	Mounting-thread size of the selected version.
L	Working length marked on the head drawing.
TB0601 / TP0902	Insert designation for the relevant seat.

Match the toolholder or bar to the actual interface of the chosen head. M threads and modular LBK interfaces are different connections; the same boring range does not imply the same mounting. Use the interface marking on the card rather than the appearance of the body alone.

4. Fine diameter adjustment

Reading	Setting change
1 dial division	0.01 mm on diameter
The same division	0.005 mm radially — on one side of the axis

The scale indicates the mechanism setting. Radial and diametral values are not interchangeable: moving the cutting edge by 0.005 mm radially changes the diameter by 0.01 mm. A dial reading is not a guarantee of a particular finished-bore roundness or tolerance.

5. Adjustment sequence

Step	Action
1	Release the adjustment mechanism locking screw.
2	Turn the dial back by half a turn to take up clearance before the final setting.
3	Adjust the dial to the required diameter within the range of the head and insert holder.
4	Tighten the locking screw again after setting.

The locking screw and adjustment dial have separate functions. Release the lock first, then set the diameter and finally lock the mechanism again. Fine adjustment remains within the range specified for that head.

6. Inserts and retaining screws

Head version	Insert	Insert screw
SDJ 10–12 / M5	TB0601 (TB06)	M2×4
SDJ 12–14 / M6; 14–17 / M6	TP0902 (TP09)	M2.5×6
SDJ 16–21 / M8; 20–28 / M10	TP0902 (TP09)	M2.5×6

Cutting inserts are sold separately. Match the full insert designation to the specific head seat; TB0601 and TP0902 are different systems. The screw designation in the table refers to insert retention, not to the thread connecting the head to its toolholder.

7. Selecting the head for an operation

Check	Selection criterion
Bore diameter	The required diameter must fall within the range of the selected head.
Mounting	The mounting thread or head interface must match the toolholder.
Working length	Use the L dimension on the card for the selected size.
Insert	Check the insert system and select an insert grade suitable for the workpiece material.

Select cutting conditions for the insert, workpiece material and setup. Use the dimensions printed on the cards to choose the tool; photograph proportions do not replace the stated values.

8. Questions before selection

Is the cutting insert included?
No. Select and purchase the cutting insert separately.

What does one division mean?
A setting change of 0.01 mm on diameter, equivalent to 0.005 mm radially.

Is L the total length?
No. In the threaded-head table, L denotes the working section marked on the card, excluding the mounting thread.

Is the bore range enough to choose a head?
No. Also check the mounting interface and insert type. Heads with similar ranges can have different connections.