TAPER ADAPTER MT3 - JT4
Features
- Conversion: MT3 male shank → JT4 male taper (for JT4-bore chucks).
- Precision-ground tapers for low run-out and reliable grip.
- Hardened steel construction for durability in workshop use.
- Smooth finish for clean seating and easy release.
- Industry-standard geometry compatible with common machines and arbors.
Benefits
- Versatility: mount JT4 chucks on MT3 machines without replacing arbors.
- Accuracy: concentric fit improves hole quality and tool life.
- Quick setup: press-fit assembly—no special tools needed.
Extra Information
- Thoroughly clean and degrease both tapers before assembly.
- Seat the chuck with a firm hand press; avoid hammering on the chuck body.
- Remove using the machine’s eject feature or correct taper drift/wedge.
Pro Tip
- Mark the adapter and chuck with a reference line; reassemble to the same orientation to preserve best concentricity.
- If insertion feels rough, lightly stone any raised burrs on the tapers—never sand or file the seating surfaces.
Specifications
| Description | Spec |
|---|---|
| Brand | Tork Craft |
| Model / Cat No. | CMJT4-2 |
| Product Type | Taper adapter |
| Input Taper (Machine Side) | MT3 (Morse Taper #3), male |
| Output Taper (Chuck Side) | JT4 (Jacobs Taper #4), male |
| Material | Hardened, precision-ground steel |
| Finish | Ground, smooth seating surfaces |
| Typical Uses | Fitting JT4 drill chucks to MT3 drill presses, lathe tailstocks, mills (drill mode) |
Safety
- Disconnect power before installing/removing chucks or adapters.
- Ensure tapers are fully seated; avoid side-loading small drills.
- Use rotary drilling only—do not use hammer/impact with taper-mounted chucks.
- Wear eye protection and secure the workpiece properly.
