Holder and chuck pairing
The source pairs G3 holders with GT3-M and G12 holders with GT12-M.
Catalog reference image. Final configuration is confirmed in the quotation.
Tapping Chucks & Tap Holders
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BT-GT
GT Telescopic Tapping Collet Holders
Overview
BT40 and BT50 telescopic tap holders for GT3-M and GT12-M chucks. Compare M3–M12 and M12–M24 catalog ranges, connection dimensions and holder lengths.
AvailabilityConfirm before order
Lead timeQuote based
Product description
BT GT telescopic tapping holders connect the listed BT40 or BT50 spindle interfaces to GT3-M or GT12-M tapping chucks. The catalog separates the smaller and larger tap ranges into different holder combinations. Choose the holder and chuck as a matched system, then confirm the tap shank, machine tapping method and required axial movement.
Tap-range groups
The listed groups are M3–M12 and M12–M24; select the correct row.
Compensation confirmation
Telescopic action is identified, but the source does not state a compensation travel value.
Choosing a BT40 GT tapping holder
- BT40-G3-90: M3–M12 catalog range, d = 19 mm, L1 = 90 mm and GT3-M chucks. Request BT40-G3-90.
- BT40-G12-135: M12–M24 catalog range, d = 30 mm, L1 = 135 mm and GT12-M chucks. Request BT40-G12-135.
M12 appears in both ranges, so a request for “an M12 holder” does not identify the required assembly. Include the required tap sizes, actual shank and drive-square dimensions, machine tapping method and individual chuck quantities.
Keep holder dimensions separate from telescopic travel
The table’s L1 = 135 mm is not a stated compensation stroke. If your process requires particular axial travel, include that requirement and request confirmation against the proposed drawing. Likewise, list the chucks required separately; the holder row does not specify a complete assortment.
Compare individual GT tapping chucks or quick-change tap holder sets before finalizing the package.
Keep the holder and chuck schedule together
Download the GT holder and chuck reference with inquiry worksheet (PDF, 3 pages)
Compare all four BT40/BT50 holder rows alongside the individual chuck models, then record each required component and quantity on the printable worksheet.
The reference separates holder dimensions from compensation requirements. Confirm the tap shank, drive square and complete mating drawing before ordering; the table does not establish compensation travel or included accessories.
Specifications & model range
Dimensions are in millimeters unless otherwise stated. Confirm the final drawing before ordering.
- Interface
- BT40, BT50
- Tapping range
- M3-M24
- Compatible chuck
- GT3-M, GT12-M
4 catalog rows
Select an underlined catalog reference to include that row in your inquiry.
| Ordering code | Tapping range | d | L1 | D | Chuck |
|---|---|---|---|---|---|
| BT40-G3-90 | M3-M12 | 19 | 90 | 46 | GT3-M |
| BT40-G12-135 | M12-M24 | 30 | 135 | 66 | GT12-M |
| BT50-G3-90 | M3-M12 | 19 | 90 | 46 | GT3-M |
| BT50-G12-135 | M12-M24 | 30 | 135 | 66 | GT12-M |
No matching model in this table. Try a shorter code, or send your required size or drawing.
Ranges and slash-separated values describe catalog families, not every possible combination. Confirm the complete model and drawing before ordering.
Application scenarios
Typical selection contexts for this series, not customer project claims. Confirm machine compatibility and cutting conditions for your setup.
Machine tapping
Building a tapping holder assembly for a documented machine cycle.
Tap-size changeovers
Planning matched GT chuck selections within the selected holder range.
BT tooling programs
Separating tapping holders from rigid milling and drilling holders.
Inspection & order review
Specify the dimensions, tolerances and records your order requires. Acceptance criteria must be agreed for the selected model.
Catalog fields to check
- Ordering code
- Tapping range
- d
- L1
- D
- Chuck
Check the drawing reference faces and units. A catalog size alone does not define a tolerance or an inspection method.
Records to request
List any required dimensional report, material document or model identification photograph in your inquiry. Confirm availability and scope in the quotation.
For a drawing-based part, include the drawing revision and identify the critical dimensions. Website photographs are not inspection reports.
Packaging & delivery
Agree the packing method and photo requirements when confirming your order.
Order-specific photo confirmation
No verified shipment photographs for this series are currently published. Include selected-model, protective-packing and outer-label photos in your order requirements.
Discuss packing requirementsPhotos to confirm before dispatch
Use this checklist to agree what should be documented for your selected model.
- Holder and matching GT chuck codes shown
- Telescopic section and taper protected
- Ordered chucks and accessories counted individually
Stock, dispatch date and shipping method are confirmed with the quotation. Website images are not live inventory evidence.
Technical resources
Product specifications
Keep a copy of the current series information for comparison. Confirm the final model and drawing before placing an order.
View specificationsPrepare a tap-holder inquiry
Identify the machine connection, tap shank and driving square.
Read the guideRelated selection information
Browse the existing tooling guides and compare product families before selecting a model.
Browse technical resourcesRelated product series
Compare alternative interfaces and complementary tooling. A related series is not automatically interchangeable.
GT3 / GT12
GT3 and GT12 Tapping Chucks
Models and specifications
STANDARD TAP SERIES
Machine and Hand Taps
Models and specifications
G SERIES
Telescopic Quick-Change Tap Holder Sets
Models and specificationsIs the holder supplied with every GT chuck size?
That is not established by the table. Specify the chucks and tap sizes required for the quotation.
Do L1 = 90 mm and L1 = 135 mm specify the telescopic travel?
No. Those are the table's L1 dimensions for the G3 and G12 holder rows, respectively. The catalog identifies telescopic holders but does not publish the compensation stroke. Do not use the 90 or 135 mm dimension as an axial-travel rating; that requirement needs the selected holder's drawing or confirmed specification.
Which chucks match BT40-G3-90 and BT40-G12-135?
The catalog pairs BT40-G3-90 with GT3-M chucks for M3–M12 and lists d = 19 mm and L1 = 90 mm. BT40-G12-135 is paired with GT12-M chucks for M12–M24, with d = 30 mm and L1 = 135 mm. M12 appears in both groups, so the holder connection must be identified before choosing an M12 chuck.
Is thread size enough to select the chuck?
Also provide the tap's actual shank and driving-end dimensions, together with the tapping method.