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Mongtec nut-attachment and premium live centres

37 article numbers across the MSNN, MSW series. MSNN adds a nut so the centre comes off the shaft without a puller. MSW is the premium standard centre, with a contactless seal on top of the oil seal. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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Why a nut

The MSNN series is the standard centre with a nut on the body. Getting a live centre out of a tailstock quill that has been sitting in coolant is a job nobody enjoys; the nut gives a spanner flat to work against, so the centre detaches and reattaches without a puller and without hammering on a precision bearing stack. If your operators change centres often — different point angles for different jobs — this is the series that pays for itself.

What the premium buys

MSW is described in the catalogue as the premium standard rotating centre. It carries a contactless seal in addition to the special oil seal. A contact seal wears; a labyrinth-style contactless seal does not touch, so it does not wear and it does not add drag. On a machine that floods coolant at pressure, or on a shop running lights-out where nobody is watching the tailstock, that second barrier is what keeps swarf out of the bearings for the life of the centre.

The MNSR variant inside the MSW range is the extended-head version. All MSW sizes cover Morse 3 to Morse 6.

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.

MSNN — 5 article numbers

Model No	Taper	ΦD	ΦD1	Φd	L	L1	L2	L3	L4	L5	L6	Weight(kg)	R.P.M	RunOut(mm)
2601001	MT2	49	65	25	140	68	72	42	30	6	10	500	5,000	0.003
3601001	MT3	49	65	25	157	85	72	42	30	6	10	500	5,000	0.003
4601001	MT4	66	85	31.4	201	108	93	53	40	8	12	800	3,800	0.003
5601001	MT5	83	105	40	251	136	115	65	50	8	15	2,000	3,000	0.003
6601001	MT6	105	125	50	324	189	135	75	60	10	17	3,500	2,800	0.003

MSNNNAC — 5 article numbers

Model No	Taper	ΦD	ΦD1	Φd	L	L1	L2	L3	L4	L5	L6	ΦC	Weight(kg)	R.P.M	RunOut(mm)
2701001	MT2	49	65	25	140	68	72	—	30	6	10	10	500	5,000	0.003
3701001	MT3	49	65	25	157	85	72	42	30	6	10	10	500	5,000	0.003
4701001	MT4	66	85	31.4	201	108	93	53	40	8	12	14	800	3,800	0.003
5701001	MT5	83	105	40	251	136	115	65	50	8	15	18	2,000	3,000	0.003
6701001	MT6	105	125	50	324	189	135	75	60	10	17	30	3,500	2,800	0.003

MSNNAL/MSNNALC — 5 article numbers

Model No	Taper	ΦD	ΦD1	Φd	L	L1	L2	L3	L4	L5	L6	ΦC	Weight(kg)	R.P.M	RunOut(mm)
2701001	MT2	49	65	25	140	68	72	42	30	6	10	10	500	5,000	0.003
3701001	MT3	49	65	25	157	85	72	42	30	6	10	10	500	5,000	0.003
4701001	MT4	66	85	31.4	201	108	93	53	40	8	12	14	800	3,800	0.003
5701001	MT5	83	105	40	251	136	115	65	50	8	15	18	2,000	3,000	0.003
6701001	MT6	105	125	50	324	189	135	75	60	10	17	30	3,500	2,800	0.003

MSW — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	Weight(kg)	R.P.M	RunOut(mm)
3001101	MT3	49	24	165.5	85	80.5	51.5	29	6	500	5,000	0.003
4001101	MT4	66	30	207.5	108	99.5	61	38.5	8	800	3,800	0.003
5001101	MT5	83	39	259	136	123	73	50	8	2,000	3,000	0.003
6001101	MT6	105	49	330	189	141	81	60	10	3,500	2,800	0.003

MSWC — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	Weight(kg)	R.P.M	RunOut(mm)
3101101	MT3	49	24	165.5	85	80.5	51.5	29	10	500	5,000	0.003
4101101	MT4	66	30	207.5	108	99.5	61	38.5	14	800	3,800	0.003
5101101	MT5	83	39	259	136	123	73	50	18	2,000	3,000	0.003
6101101	MT6	105	49	330	189	141	81	60	30	3,500	2,800	0.003

MNSR — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	ΦB	Weight(kg)	R.P.M	RunOut(mm)
3201101	MT3	49	24	176.5	85	91.5	51.5	40	6	10	300	5,000	0.003
4201101	MT4	66	30	215.5	108	107.5	61	46.5	8	14	500	3,800	0.003
5201101	MT5	83	39	267.3	136	131.3	73	58.3	8	18	1,500	3,000	0.003
6201101	MT6	105	49	348	189	159	81	78	10	18	2,500	2,800	0.003

MSWAC — 4 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	ΦC	Weight(kg)	R.P.M	RunOut(mm)
3301101	MT3	49	24	176.5	85	91.5	51.5	40	6	10	300	5,000	0.003
4301101	MT4	66	30	215.5	108	107.5	61	46.5	8	14	500	3,800	0.003
5301101	MT5	83	39	267.3	136	131.3	73	58.3	8	18	1,500	3,000	0.003
6301101	MT6	105	49	348	189	159	81	78	10	18	2,500	2,800	0.003

MSWAL/MSWALC — 6 article numbers

Model No	Taper	ΦD	Φd	L	L1	L2	L3	L4	L5	L6	Φd1	Weight(kg)	R.P.M	RunOut(mm)
4401101	MT4	66	30	225.5	108	117.5	61	56.5	8	18	12	300	3,800	0.003
6401101	MT6	105	49	370	189	181	81	100	10	30	14	2,500	2,800	0.003
3501101	MT3	49	24	184.6	85	99.6	51.5	48.1	6	19	10	300	5,000	0.003
4501101	MT4	66	30	225.5	108	117.5	61	56.5	8	18	12	500	3,800	0.003
5501101	MT5	83	39	279.2	136	143.2	73	70.2	8	19.5	14	1,500	3,000	0.003
6501101	MT6	105	49	370	189	181	81	100	10	30	14	2,500	2,800	0.003

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

Does the nut change the accuracy?

No. The MSNN series is catalogued at the same max 0.003 mm run-out as the standard MSN series. The nut is a mounting feature on the body, outside the bearing stack.

Is the contactless seal instead of the oil seal or as well as it?

As well as. The MSW carries both: the special oil seal that the standard series uses, plus a contactless seal ahead of it.

What is MNSR?

It is the extended-head variant catalogued inside the MSW series, with the ΦB dimension. Same body and sealing, longer nose.