MBH modular rough boring head, LBK / BST, range 20-710 mm

Kortools

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MBH20-26 LBK1

MBH25-32 LBK2

MBH32-42 LBK3

MBH40-55 LBK4

MBH52-70 LBK5

MBH68-90 LBK6

MBH90-122 LBK6

MBH120-160 BST

MBH160-210 BST

MBH200-310 BST

MBH300-410 BST

MBH400-510 BST

MBH600-710 BST

MBH500-610 BST

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Product description

MBH rough boring head — LBK / BST connection

Adjustable boring range · CCMT inserts · size family covering Ø20–710 mm

The modular MBH boring head enlarges existing holes in rough boring operations using replaceable CCMT inserts. Adjusting the cutting units sets the diameter within the range of the selected model. The family includes cylindrical LBK heads and larger BST versions, including bridge-type heads.

Select a specific head and its range, such as MBH20-26 LBK1 or MBH300-410 BST. The 20–710 mm designation covers the whole family, not the adjustment range of one tool. Match the connection and insert size to the selected variant designation.

1. Applications

MBH heads are intended for rough boring in combination with a suitable machine tool holder. They enlarge existing holes and prepare them for subsequent machining. Bridge versions provide dedicated tooling for larger diameters rather than extending a small-range head beyond its specified range.

Task	Selection criteria
Enlarging a hole	Target diameter within the model range
Roughing before finishing	Suitable head, insert and machining allowance for the part
Larger diameters	BST version with the required range
Changing the tool assembly	Matching head and holder interfaces

2. Construction and adjustment

Two cutting units with replaceable inserts form the rough boring arrangement. Cylindrical MBH heads provide adjustment and a scale to assist setting. The A/B arrangement allows the inserts to be set at equal or different heights to suit the intended machining method.

The scale assists setting, but the finished diameter must be checked by measurement. Adjustment range is not a statement of finished-hole accuracy. Secure the adjustable parts in their selected positions before machining.

3. Head connection — LBK or BST

LBK identifies the connection size, not the machine spindle taper itself. For example, LBK1 has an Ø11 mm connector, while LBK6 has an Ø36 mm connector. The selected head needs a holder with the corresponding seat. BST versions use a separate connection family.

Connection	Connector diameter d	Head ranges [mm]
LBK1	Ø11 mm	20–26
LBK2	Ø14 mm	25–32
LBK3	Ø18 mm	32–42
LBK4	Ø22 mm	40–55
LBK5	Ø28 mm	52–70
LBK6	Ø36 mm	68–90 / 90–122

Models from MBH120-160 BST upwards use the BST connection. LBK and BST are not interchangeable designations merely because their machining ranges are similar. Check the full head designation and the mating connection on the holder.

4. Variants and matching inserts

Variant	Boring range	Connection	Compatible insert
MBH20-26 LBK1	Ø20–26 mm	LBK1	CCMT0602
MBH25-32 LBK2	Ø25–32 mm	LBK2	CCMT0602
MBH32-42 LBK3	Ø32–42 mm	LBK3	CCMT0602
MBH40-55 LBK4	Ø40–55 mm	LBK4	CCMT09T3
MBH52-70 LBK5	Ø52–70 mm	LBK5	CCMT09T3
MBH68-90 LBK6	Ø68–90 mm	LBK6	CCMT1204
MBH90-122 LBK6	Ø90–122 mm	LBK6	CCMT1204
MBH120-160 BST	Ø120–160 mm	BST	CCMT1204
MBH160-210 BST	Ø160–210 mm	BST	CCMT1204
MBH200-310 BST	Ø200–310 mm	BST	CCMT1204
MBH300-410 BST	Ø300–410 mm	BST	CCMT1204
MBH400-510 BST	Ø400–510 mm	BST	CCMT1204
MBH500-610 BST	Ø500–610 mm	BST	CCMT1204
MBH600-710 BST	Ø600–710 mm	BST	CCMT1204

Each range belongs to a separate variant. MBH90-122 LBK6 covers Ø90–122 mm. The two LBK6 models share a connector diameter but have different boring ranges, so the complete designation is needed when selecting the tool.

5. Head dimensions

Length L below refers to the section marked on the dimensional card. It is not the overall length of the head and holder assembly. On LBK heads, the connector extends beyond the head-length dimension.

Variant	Length L
MBH20-26 LBK1	34 mm
MBH25-32 LBK2	36 mm
MBH32-42 LBK3	45 mm
MBH40-55 LBK4	55 mm
MBH52-70 LBK5	66 mm
MBH68-90 LBK6	77 mm
MBH90-122 LBK6	81 mm
MBH120-160 BST	83.5 mm

Boring range, head length and connector diameter describe different features. None of them alone specifies maximum hole depth or the working reach of the complete assembly. Those depend on the holder and the available machining space as well.

6. Insert and coolant selection

The head seat determines the matching CCMT insert size. Select the insert grade, coating and geometry for the workpiece material and operation. The designations CCMT0602, CCMT09T3 and CCMT1204 do not by themselves specify a carbide grade or suitability for a particular workpiece material.

Insert family	Head models
CCMT0602	MBH20-26 / MBH25-32 / MBH32-42
CCMT09T3	MBH40-55 / MBH52-70
CCMT1204	MBH68-90 / MBH90-122 / BST

The cylindrical MBH family provides internal coolant passages towards the cutting area. This arrangement requires a compatible holder and a coolant supply from the machine. Head range alone does not establish a working pressure or coolant parameters for the whole family.

7. Selecting the assembly

Step	Check before selecting
1. Diameter	The selected head range includes the required diameter
2. Connection	LBK1–LBK6 or BST matches the holder
3. Insert	The complete insert-family designation matches the seat
4. Assembly geometry	The head and holder fit within the machining area
5. Working conditions	Insert grade, setting and cutting conditions suit the part

Example: for an Ø80 mm bore, select the MBH68-90 LBK6 range, check for an LBK6 / Ø36 mm holder connection, and match a CCMT1204 insert. For an Ø350 mm bore, MBH300-410 BST provides the corresponding range with a different connection system. These examples cover range and interface selection, not cutting parameters.