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Mongtec BBT shrink fit chucks

76 article numbers on the BBT (dual-contact BIG-PLUS style face-and-taper) 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

ShankBBT (dual-contact BIG-PLUS style face-and-taper)
Clamping taper4.5°
Bore rangeØ3 – Ø32 mm
Run-out (A)≤ 0.003 mm
BalanceG2.5 / 25,000 rpm
CoolantForm AD (through-spindle)
Article numbers76
BrandMongtec 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.

BBT40 — 39 article numbers

Article no.Bore Ø dDD1LL2L1NG
BBT40QSF03Q80Ø315208053---
BBT40QSF04Q80Ø415208053---
BBT40QSF05Q80Ø515208053---
BBT40QSF06Q90Ø6212790633610M5
BBT40QSF08Q90Ø8212790633610M6
BBT40QSF10Q90Ø10243190634210M8x1
BBT40QSF12Q90Ø12243190634710M10x1
BBT40QSF14Q90Ø14273490634710M10x1
BBT40QSF16Q90Ø16273490635010M12x1
BBT40QSF18Q90Ø18334090635010M12x1
BBT40QSF20Q90Ø20334090635210M16x1
BBT40QSF25Q100Ø254453100735810M16x1
BBT40QSF32Q100Ø324453100736210M16x1
BBT40QSF03Q120Ø3152012093---
BBT40QSF04Q120Ø4152012093---
BBT40QSF05Q120Ø5152012093---
BBT40QSF06Q120Ø62127120933610M5
BBT40QSF08Q120Ø82127120933610M6
BBT40QSF10Q120Ø102432120934210M8x1
BBT40QSF12Q120Ø122432120934710M10x1
BBT40QSF14Q120Ø142734120934710M10x1
BBT40QSF16Q120Ø162734120935010M12x1
BBT40QSF18Q120Ø183342120935010M12x1
BBT40QSF20Q120Ø203342120935210M16x1
BBT40QSF25Q120Ø254453120935810M16x1
BBT40QSF32Q120Ø324453120936210M16x1
BBT40QSF03Q160Ø31525160133---
BBT40QSF04Q160Ø41525160133---
BBT40QSF05Q160Ø51525160133---
BBT40QSF06Q160Ø621321601333610M5
BBT40QSF08Q160Ø821321601333610M6
BBT40QSF10Q160Ø1024341601334210M8x1
BBT40QSF12Q160Ø1224341601334710M10x1
BBT40QSF14Q160Ø1427421601334710M10x1
BBT40QSF16Q160Ø1627421601335010M12x1
BBT40QSF18Q160Ø1833511601335010M12x1
BBT40QSF20Q160Ø2033511601335210M16x1
BBT40QSF25Q160Ø2544531601335810M16x1
BBT40QSF32Q160Ø3244601601336210M16x1

BBT50 — 37 article numbers

Article no.Bore Ø dDD1LL2L1NG
BBT50QSF03Q100Ø3152010062---
BBT50QSF04Q100Ø4152010062---
BBT50QSF05Q100Ø5152010062---
BBT50QSF06Q100Ø62127100623610M5
BBT50QSF08Q100Ø82127100623610M6
BBT50QSF10Q100Ø102430.5100624210M8x1
BBT50QSF12Q100Ø122430.5100624710M10x1
BBT50QSF14Q100Ø142734100624710M10x1
BBT50QSF16Q100Ø162734100625010M12x1
BBT50QSF18Q100Ø183340100625010M12x1
BBT50QSF20Q100Ø203340100625210M16x1
BBT50QSF25Q120Ø254453120825810M16x1
BBT50QSF32Q120Ø324453120826210M16x1
BBT50QSF03Q120Ø3152012082---
BBT50QSF04Q120Ø4152012082---
BBT50QSF05Q120Ø5152012082---
BBT50QSF06Q120Ø62127120823610M5
BBT50QSF08Q120Ø82127120823610M6
BBT50QSF10Q120Ø102432120824210M8x1
BBT50QSF12Q120Ø122432120824710M10x1
BBT50QSF14Q120Ø142734120824710M10x1
BBT50QSF16Q120Ø162734120825010M12x1
BBT50QSF18Q120Ø183342120825010M12x1
BBT50QSF20Q120Ø203342120825210M16x1
BBT50QSF03Q160Ø31525160122---
BBT50QSF04Q160Ø41525160122---
BBT50QSF05Q160Ø51525160122---
BBT50QSF06Q160Ø621321601223610M5
BBT50QSF08Q160Ø821321601223610M6
BBT50QSF10Q160Ø1024341601224210M8x1
BBT50QSF12Q160Ø1224341601224710M10x1
BBT50QSF14Q160Ø1427421601224710M10x1
BBT50QSF16Q160Ø1627421601225010M12x1
BBT50QSF18Q160Ø1833491601225010M12x1
BBT50QSF20Q160Ø2033491601225210M16x1
BBT50QSF25Q160Ø2544601601225810M16x1
BBT50QSF32Q160Ø3244601601226210M16x1

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 BBT 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 BBT?

Bore diameters from Ø3 to Ø32 mm across 76 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 BBT shrink fit chucks →

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