Product Overview

Many machine shops possess a large inventory of high-quality, large-diameter cutting tools—specifically heavy-duty end mills and shell mill arbors—that utilize a traditional Morse Taper (MT) shank. The DIN 2080 NT MTB Adapter provides a highly rigid and precise method to utilize these tools in conventional manual milling machines equipped with an NT/ISO spindle taper. The "MTB" designation specifically refers to Morse Taper tools that have an internal thread at the rear of the shank. These tools are secured into the adapter using a built-in draw screw, which positively locks the taper and completely prevents the tool from pulling out or vibrating loose during heavy milling operations.

Key Features & Advantages

• Positive Draw-Thread Locking (MTB): Unlike tang-style (MTA) adapters used only for drilling, the MTB adapter features an internal draw screw that threads directly into the back of the Morse Taper tool. This guarantees absolute security against tool pull-out during aggressive manual milling and slotting.

• 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 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 machining vibrations, preventing chatter and ensuring superior surface 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.

• Includes Locking Screw: Every adapter comes fully assembled with the internal draw screw required to secure your threaded Morse Taper tool.

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 MTB shank sizes: MT1, MT2, MT3, and MT4, covering a vast range of milling cutter 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, preventing pull-out.

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

A: You must measure the large end diameter of the Morse Taper shank on your milling cutter:

• MT1: Approx. 12.065mm (0.475")

• MT2: Approx. 17.780mm (0.700")

• MT3: Approx. 23.825mm (0.938")

• MT4: Approx. 31.267mm (1.231") 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: Does the adapter include the locking draw screw?

A: Yes, all of our NT MTB adapters come fully assembled with the internal draw screw required to secure your threaded Morse Taper tool.

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

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