MTJNR/L External OD Turning Tool Holder | 93° M-Type TNMG Tool Holder
- Product Type: External Turning tool holder (OD Turning)
- Model Series: MTJNR/L (Right & Left Hand)
- Entering Angle: 93° Entering Angle (Ideal for cutting square shoulders)
- Clamping System: M-Type Double Clamp (Pin & Top Clamp)
- Insert Compatibility: TNMG, TNMA, TNMM (Negative Triangle Inserts)
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Available Shank Sizes: Includes popular sizes like mtjnr 1616 h16, mtjnr 2020 k16, and mtjnr 2525 m16 lathe compatible shanks.
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Precision MTJNR Tool Holder for Facing and Longitudinal Turning
Overview The MTJNR tool holder series is a staple in CNC machining, designed for versatility and high-performance copying. Featuring a 93° entering angle (also known as -3° lead angle), this tool allows for simultaneous turning and facing operations, enabling the machining of 90° square shoulders without changing tools.
Optimized for Heavy Duty & Copying Built with the robust M-Type double clamping mechanism, the MTJNR/L ensures superior insert stability. This rigidity is crucial when using mtjnr 2525 m22 holders for heavy roughing on large diameter shafts. The triangular TNMG insert provides 6 economical cutting edges, making it a cost-effective solution compared to rhombic inserts.
Wide Range of Applications Whether you are running a compact Swiss lathe requiring an mtjnr 1616 h16 or a heavy-duty CNC turning center using an mtjnr 2525 m16 lathe setup, this holder delivers consistent results.
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Facing: Excellent for facing operations due to the 93° angle.
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Longitudinal Turning: Smooth chip flow for long cuts.
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Copying: The geometry allows for moderate profiling and contouring.
ISO Code Naming Rules for MTJNR
| Position | Letter/Digit | Category | Description & Technical Impact |
| 1st | M | Clamping System | Multi-Lock: Utilizes both a top clamp and a locking pin. This provides the highest rigidity for this TNMG tool holder. |
| 2nd | T | Insert Shape | Triangular (60°): Designed for TNMG inserts. Offers 6 cutting edges, making it highly economical. |
| 3rd | J | Holder Style | 93° Approach Angle: Allows for turning 90° shoulders with a 3° clearance. Also enables light profiling and facing. |
| 4th | N | Clearance Angle | 0° (Negative): Designed for negative inserts, which have a stronger cutting edge and allow for double-sided use. |
| 5th | R | Hand of Tool | Right Hand: The tool moves from the tailstock toward the chuck (in standard setups). |
| 6th-7th | 2525 | Shank Size | Represents the height and width of the shank (e.g.,25mm * 25mm). |
| 8th | M | Tool Length | “M” denotes a total tool length of 150mm. |
| 9th-10th | 16 | Insert Size | Indicates the length of the cutting edge (e.g., for a TNMG 160408 insert). |
FAQs
Q: Can I use the MTJNR for 90-degree shoulder turning?
A: Yes! The 93° angle is ideal for 90-degree shoulders. The extra 3° is a “lead angle” that prevents the side of the insert from rubbing against the vertical face of the shoulder, ensuring a better finish.
Q: What is the difference between MTJNR and MTGNR?
A: The primary difference is the approach angle. MTGNR has a 91° angle, while MTJNR has a 93° angle. The 93° angle is generally preferred for its better clearance and versatility in profiling.
Q: Why is it called a “Negative” tool holder?
A: The “N” in the 4th position means it uses inserts with 0° clearance. These are called “negative inserts.” Because the insert itself doesn’t have an angle, the holder is tilted slightly in the machine to create the necessary clearance, making the cutting edge much stronger than a “positive” insert.
MTJNR/L tool holder specification
| MODEL | SIZE(MM) | INSERT | SHIM | CENTER PIN | WRENCH | PLATEN | DOUBLE SCREW | WRENCH | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LEFT | RIGHT | h | b | H | F | L | |||||||
| MTJNL1616H16 | MTJNR1616H16 | 16 | 16 | 16 | 20 | 100 | TN□□1604□□ | MT1603 | CTM513 | L2 | HL1813 | ML0625 | L3 |
| MTJNL2020K16 | MTJNR2020K16 | 20 | 20 | 20 | 25 | 125 | TN□□1604□□ | ||||||
| MTJNL2525M16 | MTJNR2525M16 | 25 | 25 | 25 | 32 | 150 | TN□□1604□□ | ||||||
| MTJNL3232P16 | MTJNR3232P16 | 32 | 32 | 32 | 40 | 170 | TN□□1604□□ | ||||||
| MTJNL4040R16 | MTJNR4040R16 | 40 | 40 | 40 | 50 | 200 | TN□□1604□□ | ||||||
| MTJNL2020K22 | MTJNR2020K22 | 20 | 20 | 20 | 25 | 125 | TN□□2204□□ | MT2204 | CTM617 | L3 | HL1917 | ML0830 | L4 |
| MTJNL2525M22 | MTJNR2525M22 | 25 | 25 | 25 | 32 | 150 | TN□□2204□□ | ||||||
| MTJNL3232P22 | MTJNR3232P22 | 32 | 32 | 32 | 40 | 170 | TN□□2204□□ | ||||||
| MTJNL4040R22 | MTJNR4040R22 | 40 | 40 | 40 | 50 | 200 | TN□□2204□□ |
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