ROMAI (Robert Maier GmbH) is a German manufacturer of angle heads and driven tooling used on machining centres and lathes worldwide. Mongtec designs and engineers angle heads and BMT/VDI driven tool holders in Taiwan that cover many of the same machine interfaces and applications. This page explains how a cross-reference works — it does not claim one-to-one interchangeability. Whether a Mongtec unit suits your application is confirmed case by case by Mongtec engineering against your drawing or model number.
| 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 ROMAI 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.
If a ROMAI 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, stop block, 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 — see repair and reconditioning.
Angle heads for machining centres (BT / CAT / HSK / SK spindles) with fixed and adjustable output, ER collet and other outputs — see the angle head range. BMT and VDI driven tool holders for lathe turrets — see driven tool holders by turret interface. Speeders and special application heads on request.
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.
Send the model number, name plate photo or drawing — reply within one working day →
ROMAI is a trademark of its owner. Mongtec is not affiliated with ROMAI / Robert Maier GmbH. Product names are used for identification and comparison only.