NT Tool column sourced from https://en.nttool.com/products/pid/87/ and https://www.directindustry.com/prod/nt-tool/product-53593-528676.html, accessed 2026-07-10 (NT Tool Corporation, Takahama City, Aichi, Japan). Mongtec column sourced from Mongtec internal engineering spec sheet, verified 2026 (https://www.mongtec-tools.com/en-US/p296-bt30qer11, accessed 2026-07-10).
| Spec | NT Tool AH/AH-OH Series (Fixed 45°/90°) | Mongtec BT30-QER11 Angle Head | Compatibility Level |
|---|---|---|---|
| Shank interface | BT, AHO, CAT (ER collet compatible); HSK and other shanks by custom order | BT30 (BT40/BT50/HSK-A63/HSK-A100 variants available across Mongtec's angle head line) | Direct interface match on BT-family shank; confirm exact gauge-line and pull-stud spec per machine |
| Head angle | Fixed 45° or 90°; head rotates 360° around shank axis | Fixed 90° (QER11 series); head orientation set at order | Functionally equivalent for 90° work; NT Tool also offers a 45° fixed and a flexible (0-90°) model Mongtec does not currently list |
| Max rotational speed | Up to 6,000 rpm (07 size, 45° fixed); 3,000 rpm on most other sizes | Rated to machining-center spindle speed per Mongtec spec sheet; confirm against specific spindle rpm at quote stage | Comparable range for general milling/drilling work; verify exact rpm rating for the specific size ordered |
| Chucking capacity | φ0.5-φ16mm (fixed type, ER/FDC collets); φ0.5-φ22mm on flexible type | ER11 collet, φ1-φ7mm nominal range per QER11 designation | Overlapping range at the small end; NT Tool's fixed-type line covers a wider tool-diameter span at the top end |
| Tapping capacity | M3-M22 (with tension/compression tap adapters) | Not a standard published spec for the QER11 line; contact Mongtec engineering for tapping-adapter compatibility | Gap – confirm directly with Mongtec before quoting a tapping application |
| Coolant | External nozzle standard; center-through coolant available on request (fixed type only) | Per Mongtec spec sheet; confirm coolant routing option at order | Comparable capability, confirm configuration per order |
| Turret interface | Axial (0°) | Radial (90°) |
|---|---|---|
| VDI16 | M0195 (ER16), M1096 (ER11), M3095 (ER11) | M2095 (ER11), M4095 (ER11), M5095 (ER16), M6095 (ER11), M7095 (ER11) |
| VDI20 | M2006 (ER20), M2106 (ER20), M3106 (ER16), M4106 (ER20) | M3006 (ER16), M5006 (ER16), M5106 (ER16), M6106 (ER10), M7106 (ER20) |
| VDI25 | M2046 (ER20), M5146 (ER25), M7046 (ER20), M8046 (ER20) | M3046 (ER20), M4146 (ER25) |
| VDI30 | M0716 (ER25), M1116 (ER25), M1816 (ER25), M2016 (ER20), M2026 (ER32), M2116 (ER25), all 30 → | M0116 (ER25), M0316 (ER25), M0416 (ER25), M0816 (ER25), M1416 (ER25), M1716 (ER25), all 28 → |
| VDI40 | M0726 (—), M0926 (ER32), M1126 (ER32), M1826 (ER32), M2326 (ER32), M2426 (ER32), all 36 → | M0126 (ER32), M0166 (ER32), M0326 (ER32), M0426 (ER32), M0526 (ER32), M0626 (ER25), all 37 → |
| VDI50 | M2036 (ER40), M2136 (ER40), M4036 (ER40), M5236 (ER40), M6036 (ER40) | M0136 (ER40), M0236 (ER40), M1136 (ER40), M3136 (ER40), M4136 (ER40), M5036 (ER40), all 11 → |
| VDI60 | M1056 (ER50), M7056 (ER50), M8056 (ER50) | — |
| BMT40 | M1257 (—) | — |
| BMT45 | M0407 (—), M6007 (ER25), M7001 (ER25), M7014 (ER25), M9407 (ER25) | M2007 (ER25), M3307 (ER25), M8007 (ER20), M8307 (—) |
| BMT55 | M1817 (ER25), M4117 (ER32), M6117 (ER25), M6317 (ER25), M7317 (ER32), M7517 (—), all 7 → | M0317 (ER25), M0717 (ER32), M0817 (—), M1117 (ER25), M1317 (ER32), M2317 (ER25), all 14 → |
| BMT60 | M4176 (—) | — |
| BMT65 | M3227 (ER32), M3427 (ER40), M4027 (ER32), M7427 (ER32), M9327 (—) | M0227 (ER32), M1227 (ER40), M2427 (—), M2527 (ER32), M5127 (ER32), M6227 (ER32), all 8 → |
| BMT75 | M1037 (ER32), M1137 (ER40), M3037 (ER40), M5037 (ER40), M7037 (ER40), M7137 (ER40) | — |
| BMT85 | M0047 (ER50), M4047 (ER50), M5047 (ER50), M7047 (ER50) | — |
Send the NT part number together with your machine model and turret — Mongtec engineering maps it to the matching Mongtec article number at quotation. The check is free.
NT Tool manufactures in Japan and ships internationally through its USA subsidiary and regional distributors, which typically means multi-week lead times for anything outside standard catalog stock, plus freight and customs time for shipments into North America, Europe, and Southeast Asia. Mongtec is a Taiwanese tooling brand supplying BT/HSK angle heads directly, which can shorten quote-to-ship time for shops that don't need an exact NT Tool part number and are open to a functionally equivalent interface.
NT Tool Corporation reports roughly 251 employees and about 5 billion yen in annual sales, with its head office in Takahama City, Aichi, Japan, and a dedicated US subsidiary (NT Tool USA Corporation, Franklin, TN) plus distribution in other regions (source: https://en.nttool.com/company/, accessed 2026-07-10). Mongtec supports customers directly from Taiwan with engineering-verified spec sheets and quote turnaround aimed at shops that need cross-reference support without going through a multi-tier distributor network.
NT Tool's angle heads are engineered for OEM-grade automotive and aerospace production runs (its customer list includes Toyota, Honda, Nissan, Mazda, and Boeing), which is reflected in its pricing tier. Mongtec targets job shops and mid-volume production users who need a BT-interface angle head at a lower landed cost, without requiring the full NT Tool catalog depth (flexible-angle heads, custom plunger lengths, etc.).
Mongtec's BT30-QER11 dimensions and rated speed are drawn from Mongtec's internal engineering spec sheet, verified against the published product page at https://www.mongtec-tools.com/en-US/p296-bt30qer11 (accessed 2026-07-10). NT Tool's published rotational-speed range (3,000-6,000 rpm depending on size) and chucking capacity (φ0.5-φ16mm/φ22mm) come from NT Tool's own English-language product page and its DirectIndustry listing (accessed 2026-07-10). Because NT Tool does not publish full dimensional drawings (gauge length, plunger length options, torque rating) on its public site, shops verifying an exact swap should request NT Tool's dimensional drawing directly and compare it against Mongtec's spec sheet before ordering.
If a NT unit on your machine is worn, damaged or discontinued, you do not need the original article number to replace it. Send the model number, the name plate photo, or the drawing of the angle head you run today — Mongtec engineering cross-references the mounting, coupling and output geometry and quotes a suitable Mongtec article, stating clearly which dimensions were confirmed. Repair of the existing unit is sometimes the better answer; where we see that, we say so.
Mongtec publishes this comparison so buyers can judge the swap themselves. It is not a claim that one brand is better than the other — the two are different companies with different ranges, and the right choice depends on the machine and the job.
Send it to info@mongtec.com or use the enquiry form. A drawing or a photo of the unit on the turret speeds this up; neither is required to start.