Product Overview

Many machine shops possess a large inventory of high-quality, large-diameter cutting tools—specifically twist drills and reamers—that utilize a traditional Morse Taper (MT) shank with a flat tang at the end. The DIN 2080 NT MTA Adapter provides a highly rigid and precise method to utilize these tools in conventional manual milling machines (like Bridgeport-style knee mills) and boring mills equipped with an NT/ISO spindle taper. The "MTA" designation specifically refers to Morse Taper tools that have a flat tang. The adapter features an internal slot that engages this tang, providing positive drive rotation and allowing for easy tool removal using a standard drift key.

Key Features & Advantages

• Positive Tang Drive (MTA): The internal bore is machined with a slot to accept the flat tang of standard Morse Taper drills. This design provides a positive mechanical drive that prevents the tool from spinning inside the taper under heavy drilling torque.

• High Precision Runout: Both the external NT machine taper and the internal Morse Taper bore are precision-ground simultaneously. We guarantee a maximum Total Indicator Runout (T.I.R.) of ≤ 0.005mm (5 microns), ensuring excellent concentricity for accurate hole sizes and extending the life of your cutting tools.

• Maximum Rigidity: Forged from premium alloy steel (such as 20CrMnTi) and case-hardened to HRC 56-60. The robust, single-piece construction of the adapter body absorbs heavy drilling thrust forces, preventing vibration and ensuring superior hole finishes.

• Standard Drawbar Threads: Machined with standard internal threads at the rear of the taper to perfectly match your machine's manual drawbar (e.g., M12 for NT30, M16 for NT40, M24 for NT50). Imperial (inch) drawbar threads are also available upon request.

• Drift Slot for Easy Removal: Features a cross-slot (drift slot) machined through the body, allowing operators to quickly and safely eject the Morse Taper tool using a standard drift wedge.

Why Partner with Pingyuan Zhenghao Machinery?

• Direct Manufacturer Savings: Bypass trading companies and source precision manual machine reduction sleeves directly from our factory for highly competitive wholesale pricing.

• Complete Spindle Compatibility: We manufacture the full range of NT tapers: NT30 (for smaller knee mills), NT40 (the most common size for universal milling machines), and NT50 (for heavy-duty boring and milling machines).

• Full Morse Taper Range: Available to accommodate all standard MTA shank sizes: MT1, MT2, MT3, MT4, and MT5, covering a vast range of drill diameters.

• Strict Quality Control: Every adapter is inspected using taper gauges (AT3 standard) to verify the exact angle and contact area of both the internal MT bore and the external NT taper.

Frequently Asked Questions (FAQ) - Selection Guide

Q1: What is the difference between an MTA and an MTB Morse Taper Adapter?

A: This is a critical distinction:

• MTA (Morse Taper with Tang): The tool has a flat "tang" at the end. It relies purely on friction to hold the tool, and the tang prevents rotation. MTA is strictly for drilling and reaming (axial loads only). If you try to mill with an MTA tool, the side loads will cause the taper to loosen and the tool will fall out.

• MTB (Morse Taper with Drawbar Thread): The tool has an internal threaded hole at the rear. The adapter has a built-in screw that pulls the tool tightly into the taper. MTB is designed for milling (radial loads) because the screw positively locks the tool in place.

Q2: How do I know which MTA size I need (MT1, MT2, MT3, MT4, MT5)?

A: You must measure the large end diameter of the Morse Taper shank on your drill or reamer:

• MT1: Approx. 12.065mm (0.475")

• MT2: Approx. 17.780mm (0.700")

• MT3: Approx. 23.825mm (0.938")

• MT4: Approx. 31.267mm (1.231")

• MT5: Approx. 44.399mm (1.748") Match this size to the corresponding NT30, NT40, or NT50 adapter.

Q3: Can I use this NT40 holder in a BT40 or SK40 CNC machine?

A:No. While NT40, BT40, and SK40 all share the same 7/24 taper angle, the top portion is completely different. NT holders have a cylindrical pilot and an internal thread for a manual drawbar. BT and SK holders have a specific V-flange for an Automatic Tool Changer (ATC) and internal threads designed to accept a pull stud (retention knob). They are not interchangeable.

Q4: How do I remove the drill from the adapter?

A: You simply insert a standard Morse Taper drift key (a tapered steel wedge) into the cross-slot on the side of the adapter and tap it lightly with a hammer. The wedge will force the tang of the tool outward, releasing the taper lock.

Securely integrate your heavy-duty Morse Taper drills into your manual milling operations with our Precision NT MTA Adapters.

Contact our sales team today for a complete catalog and bulk pricing.