Buying a master jaw: which one fits?
The master jaw (also base jaw or jaw holder) is the base jaw that holds the inserts. Which one you need depends on the kN class of your press tool. Pick your machine in the checker below.
What is a master jaw?
The master jaw is the part that clicks into your press tool and holds the interchangeable inserts. This is how the chain works:
One master jaw works with many different inserts. So you don't replace the whole jaw for each size, only the insert. You buy the master jaw itself once, matched to your machine.
For sale: from €345, free shipping across the EU, dispatched within 24 hours.
View the sets →Which master jaw for which machine?
The master jaw is determined by the kN class (pressing force) of your press tool:
| Class | Machine type | Master jaw |
|---|---|---|
| 32 kN | standard (Novopress ACO, REMS Power-Press, Viega Pressgun…) | standard master jaw |
| 19 kN | compact (ACO 102/103, M12 type…) | compact master jaw |
| 15 kN | mini / MAP (MAP1, MAP2…) | mini master jaw |
Master jaw for Henco, Bonfix, Klauke, Uponor and Novopress
You do not need a separate branded master jaw. The set fits these machines per kN class, and with the inserts you press fittings from all common brands.
| Machine | Set |
|---|---|
| Henco M-BA03 / M-BHY | Standard set (32 kN) |
| Henco M-BMINI3 | Compact set (19 kN) |
| Henco, Bonfix, Comap MAP1 / MAP2 (Klauke mini) | Standard Mini set (15 kN) |
| Klauke UAP2 / UAP3L / UAP4L | Standard set (32 kN) |
| Klauke MAP2L19 / MAP219 | Compact set (19 kN) |
| Klauke MAP1 / MAP2 / MAP2L | Standard Mini set (15 kN) |
| Uponor UP 75 / UP 110 | Standard set (32 kN) |
| Uponor MAP1 / MAP2 (mini) | Standard Mini set (15 kN) |
| Novopress ACO 201 / 202 / 203 | Standard set (32 kN) |
| Novopress ACO 102 / 103 | Compact set (19 kN) |
Another machine? Look it up in the press tool checker on this page.
Master jaw, press jaw or insert: what is what?
- Master jaw / base jaw: the base jaw in the press tool that carries the inserts.
- Press jaw: often used for the master jaw and for the complete set together (master jaw + inserts).
- Insert: the interchangeable part that determines the profile (TH/U/M/V) and the size (mm).
Our complete set = 1 master jaw + 19 inserts (TH, V, U and M, UP optional). With it you cover virtually every common fitting.