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Mongtec dead centres

26 article numbers across the MDC, MMT series. Fixed centres in hardened steel and carbide-tipped forms, held to max 0.002 mm — the reference when rigidity and accuracy beat convenience. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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When a dead centre is the right answer

A dead centre has no bearings, so it has no bearing clearance, no bearing wear and no bearing heat. What it has instead is a sliding contact against the work, which needs lubrication and generates its own heat at speed. That trade makes it the choice for grinding between centres, for fine finishing work, and for any setup where the geometry of the part is being defined by the centres rather than merely supported by them.

Both Mongtec series are catalogued at max 0.002 mm run-out with the centre point hardened to HRC 58–62.

MDC and MMT

MDC is the plain dead centre, Morse 2 to Morse 6, with the MDCC variant adding the ΦC feature. MMT is the nut dead centre — it carries a nut for removal, and its point is carbide, HRA 90–91. Carbide at that hardness resists the wear that a steel point suffers under sliding contact, which is why the MMT holds its accuracy over more parts. The MMTH and MMTHC variants add the E dimension for grinding-wheel clearance; the catalogue notes the MMTH form minimized the interference of grindingstone.

Article numbers — dimensions in mm

Dimension symbols are the catalogue's own and refer to the dimension drawing printed for each series. Quote the series name together with the model number — the same model number is used in more than one series, so "MSNN 2601001" identifies a part and "2601001" on its own does not. A dash means the catalogue does not print a usable value for that cell; those are confirmed in writing at RFQ.

MDC Series — 5 article numbers

Model No	Taper	ΦD	L	L1	L2	L3	RunOut(mm)
2409001	MT2	18	100	67	33	5	0.002
3409001	MT3	24.1	123	84	39	5	0.002
4409001	MT4	31.6	159	106.5	52.5	6.5	0.002
5409001	MT5	44.7	205	134.5	70.5	6.5	0.002
6409001	MT6	63.8	275	187	88	8	0.002

MDCC — 5 article numbers

Model No	Taper	ΦD	L	L1	L2	L3	ΦC	RunOut(mm)
2509001	MT2	18	100	67	33	5	10	0.002
3509001	MT3	24.1	123	84	39	5	10	0.002
4509001	MT4	31.6	159	106.5	52.5	6.5	14	0.002
5509001	MT5	44.7	205	134.5	70.5	6.5	18	0.002
6509001	MT6	63.8	275	187	88	8	18	0.002

MMT Series — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	RunOut(mm)
3009001	MT3	46	24	138	85	53	14	39	6	0.002
4009001	MT4	54	32	175	108	67	16	51	8	0.002
5009001	MT5	75	45	217.5	129.5	88	20	58	8	0.002
6009001	MT6	97	64	296	189	107	28	79	10	0.002

MMTC — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	ΦC	RunOut(mm)
2109001	MT2	40	18	110	67	43	13	30	5	10	0.002
3109001	MT3	46	24	138	85	53	14	39	6	10	0.002
5109001	MT5	75	75	217.5	129.5	88	20	68	8	18	0.002
6109001	MT6	97	97	296	189	107	28	79	10	30	0.002

MMTH — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	E	RunOut(mm)
2209001	MT2	40	18	110	67	43	13	30	5	11	0.002
3209001	MT3	46	24	138	85	53	14	39	6	15	0.002
4209001	MT4	54	32	175	108	67	16	51	8	21	0.002
5209001	MT5	75	45	217.5	129.5	88	20	68	8	29.4	0.002

MMTHC — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	E	ΦD	RunOut(mm)
2309001	MT2	40	18	110	67	43	13	30	5	11	10	0.002
3309001	MT3	46	24	138	85	53	14	39	6	15	10	0.002
4309001	MT4	54	54	175	108	67	16	51	8	21	14	0.002
5309001	MT5	75	75	217.5	129.5	88	20	68	8	29.4	18	0.002

Source: Mongtec Precision Center catalogue, Ver 2026 (drive centres).

Check the Morse taper of your tailstock before ordering. A centre is made for one taper and cannot be adapted without a sleeve, and a sleeve costs rigidity at exactly the point where you want it. Send Mongtec the machine make, model and tailstock taper with the RFQ.

Frequently asked

Do I need to grease a dead centre?

Yes. There is relative sliding between the point and the centre hole and it has to be lubricated, or the point and the part both suffer. This is the main practical cost of a dead centre against a live one.

Steel point or carbide?

Carbide (the MMT series, HRA 90–91) if you are running quantity or grinding; hardened steel (MDC, HRC 58–62) is enough for occasional work and is easier to re-grind.

What is the E dimension on the MMTH?

Clearance for the grinding wheel. The MMTH point form is cut back so the wheel can reach the end of the part without touching the centre.