Hydraulic or shrink fit — which should I use?

Hydraulic damps vibration and changes tools with a key, so it suits reaming, boring, finishing and any shop that does not want a heating unit. Shrink fit is slimmer and stiffer for deep cavities and very high speed. Mongtec publishes both.

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Mongtec HSK-A hydraulic chucks

Q: Which bore sizes are available in HSK-A?

Bore Ø6 to Ø32 mm across 83 published article numbers, in several gauge lengths per bore. Reduction sleeves cover intermediate shank sizes.

83 article numbers on the HSK form A (DIN 69893-1) shank, bore Ø6–32 mm. Hydraulic expansion clamping — tool changed with a hex key, no heating unit. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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How a hydraulic chuck clamps

Turning one clamping screw with a hex key pressurises a sealed fluid chamber inside the holder body. The pressure expands a thin steel sleeve uniformly around the tool shank, gripping it concentrically along the full clamping length. Release the screw and the sleeve returns — the tool comes out.

Two things follow from that. The fluid layer between body and sleeve damps vibration, which is why hydraulic chucks are the usual choice for reaming, boring and finishing where surface finish matters. And because clamping is mechanical, tools change at the machine in seconds with no heating unit, no cooling wait and no consumables.

Specification

Shank	HSK form A (DIN 69893-1)
Clamping	Hydraulic expansion sleeve, single hex-key screw
Bore range	Ø6 – Ø32 mm (reduction sleeves for intermediate shanks)
Best for	Reaming, boring, finish milling, vibration-sensitive work
Article numbers	83
Brand	Mongtec Precision Inc. — Taiwanese brand, designed and engineered in Taichung, Taiwan

Article numbers — dimensions in mm

d = tool bore · D = nose diameter · D1 = body diameter · L = gauge length · L1, L2 = clamping and body lengths · G = clamping-screw thread.

HSK32A — 4 article numbers

Article no.	Bore Ø d	D	D1	L	L1	L2	G
HSK32AQHY06Q80	Ø6	26	40	80	29	27	M5
HSK32AQHY08Q80	Ø8	28	40	80	29	27	M6
HSK32AQHY10Q85	Ø10	30	40	85	35	32	M6
HSK32AQHY12Q90	Ø12	32	40	90	40	37	M6

HSK40A — 4 article numbers

Article no.	Bore Ø d	D	D1	L	L1	L2	G
HSK40AQHY06Q70	Ø6	26	34	70	36	27	M5
HSK40AQHY08Q70	Ø8	28	34	70	36	27	M6
HSK40AQHY10Q75	Ø10	30	34	75	42	32	M6
HSK40AQHY12Q80	Ø12	32	34	80	48	37	M6

HSK50A — 8 article numbers

Article no.	Bore Ø d	D	D1	L	L1	L2	G
HSK50AQHY06Q70	Ø6	26	40	70	28	27	M5
HSK50AQHY08Q70	Ø8	28	40	70	28	27	M6
HSK50AQHY10Q75	Ø10	30	40	75	39	32	M8×1
HSK50AQHY12Q85	Ø12	32	40	85	44	37	M10×1
HSK50AQHY14Q85	Ø14	34	41	85	43.5	39	M8×1
HSK50AQHY16Q90	Ø16	38	53	90	30	42	M12×1
HSK50AQHY18Q90	Ø18	40	57	90	30	42	M8×1
HSK50AQHY20Q90	Ø20	42	60	90	29	42	M16×1

HSK63A — 30 article numbers

Article no.	Bore Ø d	D	D1	L	L1	L2	G
HSK63AQHY06Q70	Ø6	26	50	70	23	30	M5
HSK63AQHY08Q70	Ø8	28	50	70	23.5	30	M6
HSK63AQHY10Q80	Ø10	30	50	80	34	34	M8x1
HSK63AQHY12Q85	Ø12	32	50	85	39	39	M10x1
HSK63AQHY14Q85	Ø14	34	50	85	40	39	M10×1
HSK63AQHY16Q90	Ø16	38	50	90	45.5	42	M10×1
HSK63AQHY18Q90	Ø18	40	50	90	46	42	M10×1
HSK63AQHY20Q90	Ø20	42	50	90	46	44	M10×1
HSK63AQHY25Q120	Ø25	57	62	120	58	50	M16×1
HSK63AQHY32Q125	Ø32	64	-	125	-	54	M16×1
HSK63AQHY06Q150	Ø6	26	50	150	103	30	M5
HSK63AQHY08Q150	Ø8	28	50	150	103	30	M6
HSK63AQHY10Q150	Ø10	30	50	150	104	34	M8x1
HSK63AQHY12Q150	Ø12	32	50	150	104	39	M10x1
HSK63AQHY14Q150	Ø14	34	50	150	105	39	M10x1
HSK63AQHY16Q150	Ø16	38	50	150	105	42	M12x1
HSK63AQHY18Q150	Ø18	40	50	150	106	42	M12x1
HSK63AQHY20Q150	Ø20	42	50	150	106	44	M16x1
HSK63AQHY25Q150	Ø25	57	62	150	88	50	M16x1
HSK63AQHY32Q150	Ø32	64	70	150	88	54	M16x1
HSK63AQHY06Q200	Ø6	26	50	200	103.5	30	M5
HSK63AQHY08Q200	Ø8	28	50	200	104	30	M6
HSK63AQHY10Q200	Ø10	30	50	200	104.5	34	M8x1
HSK63AQHY12Q200	Ø12	32	50	200	104.5	39	M10x1
HSK63AQHY14Q200	Ø14	34	50	200	105.5	42	M12x1
HSK63AQHY16Q200	Ø16	38	50	200	105.5	42	M12x1
HSK63AQHY18Q200	Ø18	40	50	200	105.5	42	M12x1
HSK63AQHY20Q200	Ø20	42	50	200	106	44	M16x1
HSK63AQHY25Q200	Ø25	57	62	200	152	50	M16x1
HSK63AQHY32Q200	Ø32	64	70	200	152	54	M16x1

HSK80A — 7 article numbers

Article no.	Bore Ø d	D	D1	L	L1	L2	G
HSK80AQHY06Q80	Ø6	26	50	80	33	30	M5
HSK80AQHY12Q95	Ø12	32	50	95	49	39	M10x1
HSK80AQHY14Q100	Ø14	34	50	100	54.5	39	M10x1
HSK80AQHY16Q100	Ø16	38	50	100	55	42	M12x1
HSK80AQHY32Q100	Ø32	64	67	100	55	54	M10x1
HSK80AQHY20Q105	Ø20	42	50	105	61	44	M12x1
HSK80AQHY25Q110	Ø25	57	63	110	64.5	50	M16x1

HSK100A — 30 article numbers

Article no.	Bore Ø d	D	D1	L	L1	L2	G
HSK100AQHY06Q75	Ø6	26	50	75	25	30	M5
HSK100AQHY08Q75	Ø8	28	50	75	25.5	30	M6
HSK100AQHY10Q90	Ø10	30	50	90	41	34	M8x1
HSK100AQHY12Q95	Ø12	32	50	95	46	39	M10×1
HSK100AQHY14Q95	Ø14	34	50	95	47	37	M10×1
HSK100AQHY16Q100	Ø16	38	50	100	52	42	M12x1
HSK100AQHY18Q100	Ø18	40	50	100	52.5	42	M12x1
HSK100AQHY20Q105	Ø20	42	60	105	54	44	M16x1
HSK100AQHY25Q110	Ø25	57	70	110	60	50	M16x1
HSK100AQHY32Q110	Ø32	64	70	110	61.5	54	M16x1
HSK100AQHY06Q150	Ø6	26	50	150	100	30	M5
HSK100AQHY08Q150	Ø8	28	50	150	100.5	30	M6
HSK100AQHY10Q150	Ø10	30	50	150	101	34	M8x1
HSK100AQHY12Q150	Ø12	32	50	150	101.5	39	M10x1
HSK100AQHY14Q150	Ø14	34	50	150	105.5	42	M12x1
HSK100AQHY16Q150	Ø16	38	50	150	105.5	42	M12x1
HSK100AQHY18Q150	Ø18	40	50	150	105.5	42	M12x1
HSK100AQHY20Q150	Ø20	42	60	150	99	44	M16x1
HSK100AQHY25Q150	Ø25	57	70	150	100	50	M16x1
HSK100AQHY32Q150	Ø32	64	70	150	102	54	M16x1
HSK100AQHY06Q200	Ø6	26	50	200	103.5	30	M5
HSK100AQHY08Q200	Ø8	28	50	200	104	30	M6
HSK100AQHY10Q200	Ø10	30	50	200	104.5	34	M8x1
HSK100AQHY12Q200	Ø12	32	50	200	104.5	39	M10x1
HSK100AQHY14Q200	Ø14	34	50	200	105.5	42	M12x1
HSK100AQHY16Q200	Ø16	38	50	200	105.5	42	M12x1
HSK100AQHY18Q200	Ø18	40	50	200	105.5	42	M12x1
HSK100AQHY20Q200	Ø20	42	60	200	149	44	M16x1
HSK100AQHY25Q200	Ø25	57	62	200	152	50	M16x1
HSK100AQHY32Q200	Ø32	64	70	200	152	54	M16x1

Source: Mongtec Hydraulic Tooling System catalogue, Ver 2026.

Match the bore to the shank exactly. A hydraulic chuck clamps one nominal shank diameter per bore; intermediate sizes are covered with a reduction sleeve, not by the chuck itself. Tell Mongtec the shank diameters you actually run and the sleeves are quoted with the holders.

Frequently asked

How is a tool changed in a HSK-A hydraulic chuck?

With a hex key. Turning the clamping screw pressurises the internal chamber and expands the sleeve onto the shank. No heating unit, no external equipment.

Hydraulic or shrink fit?

Hydraulic damps vibration and needs no equipment to change tools — it suits reaming, boring and finishing. Shrink fit is slimmer and stiffer for deep cavities and very high speed. Mongtec publishes both — see shrink fit chucks.

Which bore sizes are available in HSK-A?

Ø6 to Ø32 mm across 83 published article numbers, in several gauge lengths per bore.

Get a quotation

Send the spindle interface, the tool shank diameters you run and the reach you need. Dimensioned drawings are supplied by email once the enquiry is open.

Request HSK-A hydraulic chucks →

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