A side-lock holder is the cheapest way to hold a cutter that will not pull out, and for roughing it is still the right answer. The only real decision is which flat your cutter has: a Weldon shank has a flat parallel to the axis, a whistle notch shank has an inclined flat that pulls the tool back against the screw as it tightens. They are not interchangeable.
Mongtec Precision supplies end mill holders in both Weldon (DIN 1835-B) and whistle notch (DIN 1835-E) forms. Not sure which flat your cutter has? See Weldon or whistle notch, or send your spindle taper and cutter shank size for a quotation.
| Weldon, DIN 1835-B | Flat parallel to the axis. The screw pushes sideways on the flat |
|---|---|
| Whistle notch, DIN 1835-E | Inclined flat. Tightening also pulls the tool back against the seat, so axial position holds |
The whistle notch flat is cut at 2 degrees. HSK-A is also built across this range, in HSK32A to HSK100A, balanced G2.5 at 25,000 rpm throughout.
| Bore | Set screw | Screws |
|---|---|---|
| ø6 | M6 | 1 |
| ø8 | M8 | 1 |
| ø10 | M10 | 1 |
| ø12 | M12 | 1 |
| ø14 | M12 | 1 |
| ø16 | M14 | 1 |
| ø18 | M14 | 1 |
| ø20 | M16 | 1 |
| ø25 | M18×2 | 2 |
| ø32 | M20×2 | 2 |
| ø40 | M20×2 | 2 |
| ø50 | M24×2 | 2 |
For cutters with a threaded shank rather than a flat, Mongtec supplies screw-in milling cutter holders in threads M8 · M10 · M12 · M16
50 / 63 / 80 / 100 / 105 / 110 / 120 / 160 mm
Weldon holders are available with coolant channels — the article number ends in K.
Body diameters (D, D1), gauge lengths (L2, L1) and the set-screw thread (G) are in the printed catalogue and are supplied with the quotation.
BT and BBT tool holders → · CNC mill tool holders →
Mongtec confirms fit and quotes from four details. Email them to info@mongtec.com or use the quote form — we reply within one working day.