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Inserts

Which inserts do I need?

You identify an insert (also called press insert or jaw insert) by two things: the profile of your fitting and the pipe size in mm. Pick your brand in the checker, or look up your profile + size below.

Insert = profile + size

An insert is the interchangeable part that clicks into the master jaw. The master jaw sits in your press tool; the insert gives the fitting the correct press contour. Which insert you need can be read from two things:

Examples: M15 = M profile, 15 mm · TH16 = TH profile, 16 mm · U16 = U profile, 16 mm · V15 = V profile, 15 mm.

STAHLPRESSE press jaw set: press jaw and 19 inserts TH, V, U and M in a case
In the set: 1 press jaw and 19 inserts (TH, V, U, M) in a case. UP is an add-on.

For sale: from €345, free shipping across the EU, dispatched within 24 hours.

View the sets →

Which insert size? (per pipe material)

The size is the outside diameter of the pipe/fitting. These are the common sizes:

MaterialProfileCommon sizes (mm)
Multilayer / plasticTH U UP16 · 20 · 25 · 32 · 40
Copper · stainless steel · steelM V12 · 15 · 18 · 22 · 28 · 35

The size is almost always printed on the fitting or the packaging. In doubt between two sizes? Measure the outside diameter of the pipe.

How many inserts do I need?

For one size you need one insert (one per press size). If you press several sizes or materials, you are better off with a complete set: 1 master jaw + 19 inserts in the profiles TH, V, U and M, with UP as an option. With it you press virtually every common fitting, whatever the brand, instead of buying separate inserts for each job.

⚠ Watch out with Uponor: Uponor fittings are often marked "U16", but the newer S-Press Plus needs the UP profile, not the regular U insert. U looks like UP, but can lead to leaks over time. More about U vs UP →

Does an insert fit every press tool?

Not directly: the insert fits into the master jaw, and the master jaw is chosen by the kN class of your machine: 32, 19 or 15 kN. Don't know which class your press tool has? Pick your machine in the press jaw checker and you'll see straight away which master jaw (and therefore which inserts) fit.

Frequently asked questions

None: it is the same part. Insert, press insert and jaw insert are all names for the interchangeable part that clicks into the master jaw.
The letter is the profile (TH, U, UP, M, V), the number the pipe size in mm. M15 = M profile for 15 mm; TH16 = TH profile for 16 mm.
The size = the outside diameter of the pipe in mm. Multilayer usually 16 to 40 mm, copper/stainless usually 12 to 35 mm. It is printed on the fitting or packaging.
The inserts fit into the master jaw, and you choose that by the kN class of your press tool. Use the press jaw checker for your machine.
Everything about press jaws, master jaws & inserts →