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Mongtec SK shrink fit chucks

Q: What run-out do Mongtec SK shrink fit chucks hold?

Run-out is ≤ 0.003 mm at 3×D and the chucks are balanced to G2.5 at 25,000 rpm, which is what makes shrink fit the first choice for high-speed and deep-cavity work.

Q: Do I need a special machine to fit these?

Yes — a shrink fit induction unit heats the bore to release and clamp the tool. Mongtec supplies the machines as well as the holders; ask for the shrink fit machine range with your enquiry.

106 article numbers on the SK / DIN 69871 (ISO 7/24) shank, bore Ø3–32 mm, 4.5° clamping taper. Run-out ≤ 0.003 mm, balanced G2.5 / 25,000 rpm, coolant form AD. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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Why shrink fit

A shrink fit chuck holds the tool by thermal interference alone: the bore is heated, the shank drops in, and the bore contracts onto it. There is no collet, no nut and no clamping mechanism between the tool and the holder, so the assembly is a single slender body — the highest holding force per unit of diameter, the slimmest profile for deep cavities, and no rotating parts to unbalance at speed.

That is why shrink fit dominates high-speed machining: run-out at ≤ 0.003 mm and balance to G2.5 at 25,000 rpm are achievable because there is nothing in the joint to move.

Specification

Shank	SK / DIN 69871 (ISO 7/24)
Clamping taper	4.5°
Bore range	Ø3 – Ø32 mm
Run-out (A)	≤ 0.003 mm
Balance	G2.5 / 25,000 rpm
Coolant	Form AD (through-spindle)
Article numbers	106
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 · L2 = projection · L1, N, G = clamping-screw and balancing-ring data.

SK30 — 19 article numbers

Article no.	Bore Ø d	D	D1	L	L2	L1	N	G
SK30QSF03Q80	Ø3	15	20	80	60.9	-	-	-
SK30QSF04Q80	Ø4	15	20	80	60.9	-	-	-
SK30QSF05Q80	Ø5	15	20	80	60.9	-	-	-
SK30QSF06Q80	Ø6	21	27	80	60.9	36	10	M5
SK30QSF08Q80	Ø8	21	27	80	60.9	36	10	M6
SK30QSF10Q80	Ø10	24	32	80	60.9	42	10	M8x1
SK30QSF12Q80	Ø12	24	32	80	60.9	47	10	M10x1
SK30QSF14Q80	Ø14	27	34	80	60.9	47	10	M10x1
SK30QSF16Q80	Ø16	27	34	80	60.9	50	10	M12x1
SK30QSF18Q80	Ø18	33	42	80	60.9	50	10	M12x1
SK30QSF20Q80	Ø20	33	42	80	60.9	52	10	M16x1
SK30QSF03Q120	Ø3	15	20	120	100.9	-	-	-
SK30QSF04Q120	Ø4	15	20	120	100.9	-	-	-
SK30QSF05Q120	Ø5	15	20	120	100.9	-	-	-
SK30QSF06Q120	Ø6	21	27	120	100.9	36	10	M5
SK30QSF08Q120	Ø8	21	27	120	100.9	36	10	M6
SK30QSF10Q120	Ø10	24	32	120	100.9	42	10	M8x1
SK30QSF12Q120	Ø12	24	32	120	100.9	47	10	M10x1
SK30QSF16Q120	Ø16	27	34	120	100.9	50	10	M12x1

SK40 — 48 article numbers

Article no.	Bore Ø d	D	D1	L	L2	L1	N	G
SK40QSF03Q80	Ø3	15	20	80	60.9	-	-	-
SK40QSF04Q80	Ø4	15	20	80	60.9	-	-	-
SK40QSF05Q80	Ø5	15	20	80	60.9	-	-	-
SK40QSF06Q80	Ø6	21	27	80	60.9	36	10	M5
SK40QSF08Q80	Ø8	21	27	80	60.9	36	10	M6
SK40QSF10Q80	Ø10	24	31	80	60.9	42	10	M8x1
SK40QSF12Q80	Ø12	24	31	80	60.9	47	10	M10x1
SK40QSF14Q80	Ø14	27	34	80	60.9	47	10	M10x1
SK40QSF16Q80	Ø16	27	34	80	60.9	50	10	M12x1
SK40QSF18Q80	Ø18	33	40	80	60.9	50	10	M12x1
SK40QSF20Q80	Ø20	33	40	80	60.9	52	10	M16x1
SK40QSF25Q100	Ø25	44	50	100	80.9	58	10	M16x1
SK40QSF32Q100	Ø32	44	50	100	80.9	62	10	M16x1
SK40QSF03Q120	Ø3	15	20	120	100.9	-	-	-
SK40QSF04Q120	Ø4	15	20	120	100.9	-	-	-
SK40QSF05Q120	Ø5	15	20	120	100.9	-	-	-
SK40QSF06Q120	Ø6	21	27	120	100.9	36	10	M5
SK40QSF08Q120	Ø8	21	27	120	100.9	36	10	M6
SK40QSF10Q120	Ø10	24	32	120	100.9	42	10	M8x1
SK40QSF12Q120	Ø12	24	32	120	100.9	47	10	M10x1
SK40QSF14Q120	Ø14	27	34	120	100.9	47	10	M10x1
SK40QSF16Q120	Ø16	27	34	120	100.9	50	10	M12x1
SK40QSF18Q120	Ø18	31	42	120	100.9	50	10	M12x1
SK40QSF20Q120	Ø20	31	42	120	100.9	52	10	M16x1
SK40QSF25Q120	Ø25	44	50	120	100.9	58	10	M16x1
SK40QSF03Q160	Ø3	15	20	160	140.9	-	-	-
SK40QSF04Q160	Ø4	15	20	160	140.9	-	-	-
SK40QSF05Q160	Ø5	15	20	160	140.9	-	-	-
SK40QSF06Q160	Ø6	21	32	160	140.9	36	10	M5
SK40QSF08Q160	Ø8	21	32	160	140.9	36	10	M6
SK40QSF10Q160	Ø10	24	34	160	140.9	42	10	M8x1
SK40QSF12Q160	Ø12	24	34	160	140.9	47	10	M10x1
SK40QSF14Q160	Ø14	27	42	160	140.9	47	10	M10x1
SK40QSF16Q160	Ø16	27	42	160	140.9	50	10	M12x1
SK40QSF18Q160	Ø18	33	50	160	140.9	50	10	M12x1
SK40QSF20Q160	Ø20	33	50	160	140.9	52	10	M16x1
SK40QSF25Q160	Ø25	44	50	160	140.9	58	10	M16x1
SK40QSF32Q160	Ø32	44	50	160	140.9	62	10	M16x1
SK40QSF06Q200	Ø6	21	32	200	180.9	36	10	M5
SK40QSF08Q200	Ø8	21	32	200	180.9	36	10	M6
SK40QSF10Q200	Ø10	24	34	200	180.9	42	10	M8x1
SK40QSF12Q200	Ø12	24	34	200	180.9	47	10	M10x1
SK40QSF14Q200	Ø14	27	42	200	180.9	47	10	M10x1
SK40QSF16Q200	Ø16	27	42	200	180.9	50	10	M12x1
SK40QSF18Q200	Ø18	33	50	200	180.9	50	10	M12x1
SK40QSF20Q200	Ø20	33	50	200	180.9	52	10	M16x1
SK40QSF25Q200	Ø25	44	50	200	180.9	58	10	M16x1
SK40QSF32Q200	Ø32	44	50	200	180.9	62	10	M16x1

SK50 — 39 article numbers

Article no.	Bore Ø d	D	D1	L	L2	L1	N	G
SK50QSF06Q80	Ø6	21	27	80	60.9	36	10	M5
SK50QSF08Q80	Ø8	21	27	80	60.9	36	10	M6
SK50QSF10Q80	Ø10	24	31	80	60.9	42	10	M8x1
SK50QSF12Q80	Ø12	24	31	80	60.9	47	10	M10x1
SK50QSF14Q80	Ø14	27	34	80	60.9	47	10	M10x1
SK50QSF16Q80	Ø16	27	34	80	60.9	50	10	M12x1
SK50QSF18Q80	Ø18	33	40	80	60.9	50	10	M12x1
SK50QSF20Q80	Ø20	33	39.5	80	60.9	52	10	M16x1
SK50QSF32Q90	Ø32	44	52.5	90	70.9	62	10	M16x1
SK50QSF06Q120	Ø6	21	27	120	100.9	36	10	M5
SK50QSF08Q120	Ø8	21	27	120	100.9	36	10	M6
SK50QSF10Q120	Ø10	24	32	120	100.9	42	10	M8x1
SK50QSF12Q120	Ø12	24	32	120	100.9	47	10	M10x1
SK50QSF14Q120	Ø14	27	34	120	100.9	47	10	M10x1
SK50QSF16Q120	Ø16	27	34	120	100.9	50	10	M12x1
SK50QSF18Q120	Ø18	33	42	120	100.9	50	10	M12x1
SK50QSF20Q120	Ø20	33	42	120	100.9	52	10	M16x1
SK50QSF25Q120	Ø25	44	53	120	100.9	58	10	M16x1
SK50QSF32Q120	Ø32	44	53	120	100.9	62	10	M16x1
SK50QSF06Q160	Ø6	21	32	160	140.9	36	10	M5
SK50QSF08Q160	Ø8	21	32	160	140.9	36	10	M6
SK50QSF10Q160	Ø10	24	34	160	140.9	42	10	M8x1
SK50QSF12Q160	Ø12	24	34	160	140.9	47	10	M10x1
SK50QSF14Q160	Ø14	27	42	160	140.9	47	10	M10x1
SK50QSF16Q160	Ø16	27	42	160	140.9	50	10	M12x1
SK50QSF18Q160	Ø18	33	51	160	140.9	50	10	M12x1
SK50QSF20Q160	Ø20	33	51	160	140.9	52	10	M16x1
SK50QSF25Q160	Ø25	44	60	160	140.9	58	10	M16x1
SK50QSF32Q160	Ø32	44	60	160	140.9	62	10	M16x1
SK50QSF06Q200	Ø6	21	32	200	180.9	36	10	M5
SK50QSF08Q200	Ø8	21	32	200	180.9	36	10	M6
SK50QSF10Q200	Ø10	24	34	200	180.9	42	10	M8x1
SK50QSF12Q200	Ø12	24	34	200	180.9	47	10	M10x1
SK50QSF14Q200	Ø14	27	42	200	180.9	47	10	M10x1
SK50QSF16Q200	Ø16	27	42	200	180.9	50	10	M12x1
SK50QSF18Q200	Ø18	33	51	200	180.9	50	10	M12x1
SK50QSF20Q200	Ø20	33	51	200	180.9	52	10	M16x1
SK50QSF25Q200	Ø25	44	60	200	180.9	58	10	M16x1
SK50QSF32Q200	Ø32	44	60	200	180.9	62	10	M16x1

Source: Mongtec Shrink Fit Chuck catalogue, Ver 2026.

A shrink fit holder needs a shrink fit unit. Tools are changed by induction heating, not by hand. If you do not already run one, ask for the Mongtec shrink fit machine range with your enquiry — holder and unit are quoted together.

Frequently asked

What run-out do Mongtec SK shrink fit chucks hold?

Run-out is ≤ 0.003 mm and the chucks are balanced to G2.5 at 25,000 rpm. There is no collet or nut in the joint, so there is nothing to shift under load or at speed.

Which bore sizes are available in SK?

Bore diameters from Ø3 to Ø32 mm across 106 published article numbers, in several gauge lengths per bore — pick the shortest holder that still reaches the feature.

Do I need a special machine to fit these?

Yes. A shrink fit induction unit heats the bore to release and clamp the tool. Mongtec supplies the machines as well as the holders.

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 SK shrink fit chucks →

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