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Mongtec HSK-A collet chucks and milling chucks

185 article numbers on HSK32A · HSK40A · HSK50A · HSK63A · HSK80A · HSK100A. ER, OZ, TG, SKS, pull-back and precision screw collet chucks plus HC and CT power milling chucks on the HSK-A taper, HSK32A to HSK100A. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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Why HSK, and what it costs

A steep taper such as BT locates on the cone alone. HSK is a hollow short taper with simultaneous face contact: the 1:10 cone seats and the flange touches the spindle nose at the same moment, and the drawbar expands segments inside the hollow shank to pull both home. Three things follow.

It holds gauge length. With the face constrained, the holder cannot pull further in as spindle speed rises and the bore opens. Z stays where you set it.

It is stiff at the joint. Face contact roughly doubles the bending stiffness at the spindle nose compared with a taper-only joint, which is exactly where a long tool wants to flex.

It changes fast. Half the mass and half the length of an equivalent steep taper, so the tool changer moves it quicker and the spindle bearings see less of it.

The costs are real too. HSK tooling is more expensive, the hollow shank is easier to damage if it is dropped or if chips get into the flange face, and cleanliness stops being optional — a chip trapped on the face contact surface destroys the very thing you paid for. Form matters as well: HSK-A (automatic change, with drive slots and coolant-through) is not interchangeable with HSK-C, E or F.

What is on this page

ER collet chucks in UM-nut, standard and mini-nut versions, ER11 to ER50, Ø1–34 mm, in lengths from 50 to 300 mm and across the full HSK32A–HSK100A range. This is the volume family and the one to default to.

SKS high-speed chucks for spindles that run where HSK earns its keep. OZ and TG where the cut needs more torque than an ER collet will hold. Pull-back (DC) for small-diameter long reach — Ø1–12 mm in bodies to 200 mm. NDC precision screw chucks for deep, narrow features.

HC and CT power milling chucks, Ø20–42 mm, for sustained roughing where side load rather than pull-out is what threatens the grip.

A note on sizes

HSK32A and HSK40A appear only in the smaller ER sizes; the programme concentrates on HSK63A and HSK100A, which is where the machine population is. If you need an intermediate size in a family that only lists 63 and 100, ask — it is a made-to-order question, not a no.

Article numbers — dimensions in mm

Dimension symbols are the catalogue's own and refer to the dimension drawing printed for each product. A dash means the catalogue does not print a usable value for that cell; those are confirmed in writing at RFQ. Where a table's printed header disagrees with its drawing, a note above the table says so.

ER Collet Chuck — 118 article numbers

Catalogue page 4 prints this table’s headers as D / d1 / d2 / d3. The values are the same D / D1 / L / Capacity set that pages 5 and 6 print correctly for the identical article numbers, and the last figure in each article number matches the L column — so the symbols are shown corrected here, with the discrepancy recorded rather than hidden.

Article no.	D	D1	L1	Capacity
HSK32AQER16UMQ80	28	32	80	1-10
HSK32AQER20UMQ80	34	35	80	1-13
HSK32AQER25Q80	42	42	80	2-16
HSK32AQER32Q50	50	50	50	3-20
HSK40AQER16UMQ80	28	32	80	1-10
HSK40AQER20UMQ80	34	35	80	1-13
HSK40AQER25Q80	42	42	80	2-16
HSK40AQER32Q80	50	50	80	3-20
HSK50AQER16UMQ80	28	32	80	1-10
HSK50AQER20UMQ80	34	35	80	1-13
HSK50AQER25Q80	42	42	80	2-16
HSK50AQER32Q100	50	50	100	3-20
HSK63AQER16UMQ75	28	32	75	1-10
HSK63AQER20UMQ75	34	35	75	1-13
HSK63AQER25Q75	42	42	75	2-16
HSK63AQER32Q75	50	50	75	3-20
HSK63AQER40Q80	50	63	80	4-26
HSK63AQER16UMQ100	28	32	100	1-10
HSK63AQER20UMQ100	34	35	100	1-13
HSK63AQER25Q100	42	42	100	2-16
HSK63AQER32Q100	50	50	100	3-20
HSK63AQER40Q100	50	63	100	4-26
HSK63AQER16UMQ120	28	32	120	1-10
HSK63AQER20UMQ120	34	35	120	1-13
HSK63AQER25Q120	42	42	120	2-16
HSK63AQER32Q120	50	50	120	3-20
HSK63AQER40Q120	50	63	120	4-26
HSK63AQER16UMQ160T	28	32	160	1-10
HSK63AQER20UMQ160	34	35	160	1-13
HSK63AQER25Q160	42	42	160	2-16
HSK63AQER32Q160	50	50	160	3-20
HSK63AQER40Q160	50	63	160	4-26
HSK63AQER16UMQ200T	28	32	200	1-10
HSK63AQER20UMQ200	34	35	200	1-13
HSK63AQER25Q200	42	42	200	2-16
HSK63AQER32Q200	50	50	200	3-20
HSK63AQER40Q200	50	63	200	4-26
HSK80AQER16UMQ100	28	32	100	1-10
HSK80AQER20UMQ100	34	35	100	1-13
HSK80AQER25Q100	42	42	100	2-16
HSK80AQER32Q100	50	50	100	3-20
HSK80AQER40Q120	50	63	120	4-26
HSK100AQER16UMQ100	28	32	100	1-10
HSK100AQER20UMQ100	34	35	100	1-13
HSK100AQER25Q100	42	42	100	2-16
HSK100AQER32Q100	50	50	100	3-20
HSK100AQER40Q100	63	63	100	4-26
HSK100AQER50Q120	—	78	120	6-34
HSK100AQER16UMQ120T	28	32	120	1-10
HSK100AQER20UMQ120	34	35	120	1-13
HSK100AQER25Q120	42	42	120	2-16
HSK100AQER32Q120	50	50	120	3-20
HSK100AQER40Q120	63	63	120	4-26
HSK100AQER16UMQ160T	28	32	160	1-10
HSK100AQER20UMQ160	34	35	160	1-13
HSK100AQER25Q160	42	42	160	2-16
HSK100AQER32Q160	50	50	160	3-20
HSK100AQER40Q160	63	63	160	4-26
HSK100AQER16UMQ200T	28	32	200	1-10
HSK100AQER20UMQ200	34	35	200	1-13
HSK100AQER25Q200	42	42	200	2-16
HSK100AQER32Q200	50	50	200	3-20
HSK100AQER40Q200	63	63	200	4-26
HSK100AQER25Q250	42	42	250	2-16
HSK100AQER32Q250	50	50	250	3-20
HSK100AQER40Q250	63	63	250	4-26
HSK100AQER25Q300	42	42	300	2-16
HSK100AQER32Q300	50	50	300	3-20
HSK100AQER40Q300	63	63	300	4-26
HSK32AQER16Q80	28	28	80	1-10
HSK32AQER20Q80	34	34	80	1-13
HSK40AQER16Q80	28	28	80	1-10
HSK40AQER20Q80	34	34	80	1-13
HSK50AQER16Q80	28	28	80	1-10
HSK50AQER20Q80	34	34	80	1-13
HSK63AQER16Q75	28	28	75	1-10
HSK63AQER20Q75	34	34	75	1-13
HSK63AQER16Q100	28	28	100	1-10
HSK63AQER20Q100	34	34	100	1-13
HSK63AQER16Q120	28	28	120	1-10
HSK63AQER20Q120	34	34	120	1-13
HSK63AQER16Q160T	28	28	160	1-10
HSK63AQER20Q160	34	34	160	1-13
HSK63AQER16Q200T	28	28	200	1-10
HSK63AQER20Q200	34	34	200	1-13
HSK80AQER16Q100	28	28	100	1-10
HSK80AQER20Q100	34	34	100	1-13
HSK100AQER16Q100	28	28	100	1-10
HSK100AQER20Q100	34	34	100	1-13
HSK100AQER16Q120T	28	28	120	1-10
HSK100AQER20Q120	34	34	120	1-13
HSK100AQER16Q160T	28	28	160	1-10
HSK100AQER20Q160	34	34	160	1-13
HSK100AQER16Q200T	28	28	200	1-10
HSK100AQER20Q200	34	34	200	1-13
HSK32AQER11MQ50	16	16	50	1-7
HSK32AQER16MQ50	22	22	50	1-10
HSK32AQER20MQ50	28	28	50	1-13
HSK40AQER11MQ60	16	16	60	1-7
HSK40AQER16MQ60	22	22	60	1-10
HSK40AQER20MQ60	28	28	60	1-13
HSK50AQER11MQ60	16	16	60	1-7
HSK50AQER16MQ60	22	22	60	1-10
HSK50AQER20MQ60	28	28	60	1-13
HSK63AQER11MQ100	16	16	100	1-7
HSK63AQER16MQ100	22	22	100	1-10
HSK63AQER20MQ100	28	28	100	1-13
HSK63AQER25MQ100	35	35	100	2-16
HSK63AQER11MQ160T	16	16	160	1-7
HSK63AQER16MQ160T	22	22	160	1-10
HSK63AQER20MQ160	28	28	160	1-13
HSK63AQER25MQ160	35	35	160	2-16
HSK100AQER16MQ100	22	22	100	1-10
HSK100AQER20MQ100	28	28	100	1-13
HSK100AQER25MQ100	35	35	100	2-16
HSK100AQER16MQ160T	22	22	160	1-10
HSK100AQER20MQ160	28	28	160	1-13
HSK100AQER25MQ160	35	35	160	2-16

Power Milling Chuck — 8 article numbers

Article no.	D	D1	L1	Capacity
HSK63AQHC20Q100	20	50	100	3-16 / 20
HSK63AQHC25Q100	25	59	100	3-20 / 25
HSK63AQHC32Q120	32	72	120	3-25 / 32
HSK100AQHC20Q105	20	50	105	3-16 / 20
HSK100AQHC25Q105	25	59	105	3-20 / 25
HSK100AQHC32Q120	32	72	120	3-25 / 32
HSK100AQHC32Q165	32	72	165	3-25 / 32
HSK100AQHC32Q200	32	72	200	3-25 / 32

Power Milling Chuck — 15 article numbers

Article no.	Type	d	D	D1	L	L1	L2	L3	ℓ	L0	Capacity
HSK63AQCT16SAQ90	1	16	45	—	90	64	—	—	60	—	M8
HSK63AQCT20SAQ90	1	20	52	—	90	64	—	—	60	—	M8
HSK63AQCT25SAQ105	2	25	61	—	105	—	—	—	75	42	M8
HSK63AQCT32SAQ105	2	32	73	—	105	—	—	—	75	42	M8
HSK63AQCT32SAQ120	2	32	73	—	120	—	—	—	90	42	M8
HSK100AQCT16SAQ90	3	16	45	56	90	—	16	45	55	—	M10
HSK100AQCT20SAQ105	3	20	52	64	105	—	18	58	70	—	M10
HSK100AQCT25SAQ105	3	25	61	74	105	—	20	56	70	—	M10
HSK100AQCT25SAQ135	3	25	61	74	135	—	50	56	80	—	M10
HSK100AQCT32SAQ105	1	32	73	—	105	76	—	—	70	—	M10
HSK100AQCT32SAQ120	1	32	73	—	120	91	—	—	85	—	M10
HSK100AQCT32SAQ135	1	32	73	—	135	106	—	—	100	—	M10
HSK100AQCT42SAQ105	2	42	88	—	105	—	—	—	70	45	M10
HSK100AQCT42SAQ135	2	42	88	—	135	—	—	—	100	45	M10
HSK100AQCT42SAQ165	2	42	88	—	165	—	—	—	120	45	M10

OZ Collet Chuck — 8 article numbers

Article no.	D	L	Capacity
HSK50AQOZ16Q90	43	90	2-16
HSK50AQOZ25Q110	60	110	2-25
HSK63AQOZ16Q100	43	100	2-16
HSK63AQOZ25Q100	60	100	2-25
HSK63AQOZ32Q120	72	120	3-32
HSK100AQOZ16Q110	43	110	2-16
HSK100AQOZ25Q120	60	120	2-25
HSK100AQOZ32Q130	72	130	3-32

High Speed SKS Collet Chuck — 8 article numbers

Article no.	D	D1	L	Capacity	M
HSK63AQSKS10Q90	27.5	27.1	90	2-10	M21.5*1
HSK63AQSKS16Q90	40.6	40	90	3-16	M32*1.5
HSK63AQSKS10Q120	27.5	27.1	120	2-10	M21.5*1
HSK63AQSKS16Q120	40.6	40	120	3-16	M32*1.5
HSK100AQSKS10Q90	27.5	27.1	90	2-10	M21.5*1
HSK100AQSKS16Q90	40.6	40	90	3-16	M32*1.5
HSK100AQSKS10Q120	27.5	27.1	120	2-10	M21.5*1
HSK100AQSKS16Q120	40.6	40	120	3-16	M32*1.5

TG Collet Chuck — 4 article numbers

Article no.	D	L	Collet	Capacity
HSK50AQTG75Q110	50	110	TG75	2-20
HSK63AQTG75Q120	50	120	TG75	2-20
HSK63AQTG100Q130	60	130	TG100	3-25
HSK100AQTG100Q130	60	130	TG100	3-25

TG Collet Chuck — 3 article numbers

Article no.	D	D1	D2	L	L1	L2	L3	L4	Capacity
HSK63AQNDC20Q95	40	53	—	95	69	30	19	—	4-20
HSK63AQNDC14Q150	24	30	53	—	119	77	60	—	4-14
HSK100AQNDC32Q140	60	70	—	140	111	14	60	—	12-32

Pull Back Collet Chuck — 21 article numbers

Article no.	D	L	Capacity
HSK63AQDC06Q60	14	60	1-6
HSK63AQDC06Q90	14	90	1-6
HSK63AQDC06Q120	14	120	1-6
HSK63AQDC06Q150	14	150	1-6
HSK63AQDC08Q60	22	60	1-10
HSK63AQDC08Q90	22	90	1-10
HSK63AQDC08Q120	22	120	1-10
HSK63AQDC08Q150	22	150	1-10
HSK63AQDC08Q200	22	200	1-10
HSK63AQDC12Q90	34	90	1-12
HSK63AQDC12Q120	34	120	1-12
HSK63AQDC12Q150	34	150	1-12
HSK63AQDC12Q200	34	200	1-12
HSK100AQDC06Q110	14	110	1-6
HSK100AQDC06Q150	14	150	1-6
HSK100AQDC08Q110	22	110	1-10
HSK100AQDC08Q150	22	150	1-10
HSK100AQDC08Q200	22	200	1-10
HSK100AQDC12Q120	34	120	1-12
HSK100AQDC12Q150	34	150	1-12
HSK100AQDC12Q200	34	200	1-12

Source: Mongtec HSK-A Tooling System catalogue, Ver 2026.

Check the HSK form, not just the size. HSK-A, C, E and F share the size number but not the drive slots, coolant provision or flange geometry, and they are not interchangeable. Send Mongtec the machine make, model and the spindle interface designation with the RFQ.

Frequently asked

Is an HSK-A holder interchangeable with HSK-E or HSK-F?

No. The forms differ in drive slots, coolant provision and flange geometry. HSK-A is the automatic-tool-change form with drive slots and coolant through; E and F are simpler forms for high-speed spindles. Match the form your spindle is built for.

Does HSK really need more cleaning than BT?

Yes, and it is the single commonest cause of disappointment with it. The face contact is what you are paying for, and one chip on that face lifts the flange off the spindle nose. Wipe the flange and blow the bore at every change.

Which HSK size should a new machine be specified with?

HSK63A covers most of what a general machine shop does. HSK100A is for heavy roughing and large cutters. HSK32A/40A are for small, high-speed work. The machine builder’s spindle decides it, not the tooling.