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Mongtec BMT static tool holders

49 models across BMT40, BMT45, BMT55, BMT65 and BMT75 in OD, double OD, ID and face executions. OD, double OD, ID and face static tool holders for BMT40, BMT45, BMT55, BMT65 and BMT75 turrets, with the machine builders each size is catalogued as fitting. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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What a static holder does on a BMT turret

A BMT turret carries two kinds of station. A driven station has a drive coupling and spins the tool. A static station does not — it simply holds a turning tool rigidly while the workpiece turns. Most of the stations on most lathes are static, and most of the cutting on most parts is done from them.

Because there is no gear train and no bearing stack inside, a static holder is the stiffest thing you can bolt to a turret. That is its whole argument: for external turning, boring, grooving and facing, rigidity is what sets surface finish and tool life, and there is nothing to wear out.

The four executions

OD holders take a square-shank turning tool for outside diameter work — the everyday holder. Double OD holders carry two tools in one station, which buys back a station on a turret that has run out of them. ID holders clamp a round boring bar for internal work, listed by bore diameter D. Face holders present the tool for facing and for axial grooving.

Reading the dimensions

The dimension symbols are the catalogue's own and refer to the drawing printed for each execution: C and K are the body dimensions, G the height to the tool seat, H the shank size the holder accepts (bore diameter D on the ID holders), X the tool centre offset, and A, B, E the mounting pattern to the turret face.

The model number carries the two figures that matter most: on OD and face holders it is G then H (a C7020 is G70, H20), and on ID holders it is H then D (a B6532 is H65, D32). That is a useful cross-check when reading a worn label on a holder already in the crib.

Which builders each size fits

BMT is a standardised turret interface, so the size — BMT40, 45, 55, 65 or 75 — is what has to match, not the machine brand. The Compatible Brands column lists the builders whose machines the catalogue records this size as being supplied for. It is a starting point for identifying your turret, not a guarantee for a specific machine: send Mongtec the machine make, model and turret designation with the RFQ and the fit is confirmed in writing before anything is made.

Models — dimensions in mm

A quotation mark in the brands column means the same brands as the row above. A dash in a dimension column means the catalogue figure could not be verified; see the note under the tables.

OD static toolholders — 13 models

Model	C	K	G	H	X	A	B	E	Weight (kg)	Compatible brands
BMT40 C5520	75	97	55	—	25	12	50	60	2.20	DOOSAN · Hardinge
BMT45 C6020	75	110	60	20	20	15	58	58	2.49	DOOSAN · Hardinge · Spinner · Victor · Jyoti · Samsung (SMEC)
BMT45 C7020	85	110	70	20	20	15	58	58	3.43	”
BMT45 C8025	85	110	80	25	25	15	58	58	3.92	”
BMT55 C6020	90	115	60	20	20	15	64	64	3.29	DOOSAN · Hardinge · Hyundai WIA · Jyoti · Goodway · Hwacheon · Samsung (SMEC) · Victor
BMT55 C8020	86	120	80	20	20	15	64	64	4.34	”
BMT55 C8025	95	120	80	25	25	15	64	64	4.30	”
BMT55 C8032	86	120	80	32	32	15	64	64	4.34	”
BMT65 C7520	96	131	75	20	20	18	73	70	4.97	DOOSAN · Hardinge · Victor · Goodway · Haas · Hyundai WIA · Hwacheon · Samsung (SMEC)
BMT65 C7525	95	131	75	25	25	18	73	70	4.97	”
BMT65 C8025	95	131	80	25	25	18	73	70	5.25	”
BMT75 C8525	112	140	85	25	25	25	90	90	7.00	DOOSAN · Hwacheon · Hyundai WIA · Victor · Samsung (SMEC)
BMT75 C8032	112	152.5	80	—	32	25	90	90	7.14	”

Double OD static toolholders — 2 models

Model	C	K	G	H	X	A	B	E	Weight (kg)	Compatible brands
BMT55 C8020	92	120	80	20	21	15	64	64	5.60	DOOSAN · Hardinge
BMT65 C7520	97	131	75	20	21	18	73	70	6.10	”

ID static toolholders — 19 models

Model	C	K	G	H	D	A	B	E	Weight (kg)	Compatible brands
BMT40 B6025	63	94	82	60	25	12	50	60	3.20	DOOSAN · Hardinge
BMT45 B6040	75	95	88	60	40	15	58	58	3.50	DOOSAN · Hardinge · Spinner · Victor · Samsung (SMEC)
BMT45 B6532	75	95	88	65	32	15	58	58	3.35	”
BMT45 B8032	75	95	110	80	32	15	58	58	4.43	”
BMT55 B6032	86	105	90	60	32	15	64	64	5.10	DOOSAN · Hardinge · Hyundai WIA · Jyoti · Goodway · Hwacheon · Samsung (SMEC)
BMT55 B6040	86	105	90	60	40	15	64	64	5.10	”
BMT55 B7032	86	105	100	70	32	15	64	64	5.96	”
BMT55 B7040	86	105	100	70	40	15	64	64	4.90	”
BMT55 B8032	86	105	109	80	32	15	64	64	5.80	”
BMT55 B8540	86	105	115	85	40	15	64	64	5.80	”
BMT65 B6032	86	105	90	60	32	15	64	64	5.10	”
BMT65 B6040	86	105	90	60	40	15	64	64	5.10	”
BMT65 B7032	86	105	100	70	32	15	64	64	5.96	”
BMT65 B7040	86	105	100	70	40	15	64	64	4.90	”
BMT65 B8032	86	105	109	80	32	15	64	64	5.80	”
BMT65 B8540	86	105	115	85	40	15	64	64	5.80	”
BMT75 B9050	112	120	130	90	50	25	90	90	9.80	DOOSAN · Hardinge · Hyundai WIA · Victor · Samsung (SMEC)
BMT75 B11050	112	115	150	110	50	25	90	90	9.80	”
BMT75 B11060	112	135	—	110	60	25	90	90	12.30	”

Face static toolholders — 15 models

Model	C	K	G	H	X	A	B	E	Weight (kg)	Compatible brands
BMT45 F6020	75	85	60	20	20	15	58	58	2.26	DOOSAN · Hardinge · Spinner · Victor · Jyoti · Samsung (SMEC)
BMT45 F7032	90	86	70	32	32	15	58	58	3.20	”
BMT45 F8020	75	85	80	20	20	15	58	58	3.04	”
BMT45 F8525	90	86	85	25	25	15	58	58	3.82	”
BMT55 F7020	90	95	70	20	20	15	64	64	3.51	DOOSAN · Hardinge · Hyundai WIA · Jyoti · Victor · Hwacheon · Samsung (SMEC)
BMT55 F7025	86	95	70	25	25	15	64	64	3.35	”
BMT55 F8032	86	95	80	32	32	15	64	64	3.82	”
BMT55 F8520	92	95	85	20	20	15	64	64	4.06	”
BMT55 F8525	92	95	85	25	25	15	64	64	4.45	”
BMT65 F7025	95	106	70	25	25	18	—	70	4.13	DOOSAN · Goodway · Hwacheon · Hardinge · Samsung (SMEC) · Victor · Hyundai WIA · Haas
BMT65 F9525	96	105	95	25	25	18	73	70	5.62	”
BMT75 F7025	112	135	70	25	25	25	90	90	6.20	DOOSAN · Victor · Hwacheon · Hyundai WIA · Samsung (SMEC)
BMT75 F7032	112	120	70	32	32	25	90	90	5.46	”
BMT75 F12225	112	135	122	25	25	25	90	90	10.76	”
BMT75 F13532	112	120	135	32	32	25	90	90	10.61	”

Cells shown as a dash, with the reason: BMT40 C5520 H (code says H20, table prints 25) · BMT75 C8032 H (code says H32, table prints 30) · BMT75 B11060 G (table prints 1156; siblings are 130 and 150) · BMT65 F7025 B (table prints 93; every other BMT65 row prints 73). Each is confirmed in writing at RFQ rather than guessed.

Source: Mongtec BMT Static Tool Holder catalogue, Ver 2026.

Confirm the turret, not just the brand. One machine builder ships several turret sizes across its range, and the same model name can be built with different turrets in different years. Send Mongtec the machine make, model, year and the turret designation with the RFQ.

Frequently asked

How do I tell which BMT size my turret is?

Measure the bolt circle and the coupling diameter on the turret face, or read it off the machine documentation — the number in BMT40, BMT45 and so on is the coupling size in millimetres. If you are unsure, send Mongtec a photograph of the turret face with a rule across it and the machine model; that is usually enough to identify it.

Is a static holder more rigid than a driven holder?

Yes, substantially. A driven holder has a drive coupling, a gear or belt train and bearings between the turret and the tool; a static holder has none of that. Where the operation does not need a rotating tool, the static holder is the better cut.

What does the double OD holder buy me?

A station. It carries two turning tools in the space of one, which matters on a 8- or 12-station turret running a part that needs more tools than the turret has positions. The trade is that both tools share one clamping, so a change to either means re-setting both.

My machine builder is not in the Compatible Brands list — does that mean it will not fit?

No. The list records the builders the catalogue notes for that size, not an exhaustive compatibility matrix. BMT is a standard interface; what matters is the size and the turret execution. Send the machine make, model and turret designation and Mongtec will confirm.

Are the blank cells missing data?

They are figures the catalogue prints that we could not stand behind — each one either contradicts the model number or contradicts every other row in its size group. Rather than publish a number that might be wrong, the cell shows a dash and is confirmed in writing at RFQ.

Driven (live) tool holders — for the powered stations on the same turret
BMT product pages · Machine compatibility
Tool holders · Live centres