Knowledge · Fittings

Butt-welding fittings at a glance

Elbow, tee, reducer, cap or torispherical head – in steel and stainless steel. Click a picture: the dimension table opens with the dimensional drawing of your size, with tolerances and availability.

Choose the fitting

Butt-welding fittings from our range. Images: ZickwolffChoose a fitting – straight to its dimension table with dimensional drawing.

Butt-welding fittings to ASME B16.9 – the same shapes, dimensions by NPS. Images: ZickwolffChoose a fitting – straight to the ASME B16.9 dimensions.

Basics per component

Elbows

2D, 3D, 5D, angles, type A/B

Designs and bend radii, 45° or 90°, seamless or welded – and the way to the steel or stainless dimension table.

Tee

Equal and reducing

Equal or smaller branch – dimension tables steel and stainless to EN 10253.

Reducer

Concentric and eccentric

When the flat side goes on top – and all size pairs with dimensional drawing.

Cap and dished end

Cap or torispherical head

How the cap to EN 10253 differs from the torispherical head to DIN 28011.

ASME

Butt-weld fittings ASME B16.9

Elbows LR and SR, tees, reducers, caps and stub ends by NPS – in mm with inches.

Measuring

Measuring a fitting

Outside diameter and wall at the end face, for elbows the dimension W – how to find the size.

Bend radius: what 2D, 3D and 5D mean

The number before the D tells how often the nominal size fits into twice the bend radius: twice for a 2D elbow, three times for 3D, five times for 5D. The radius is measured at the pipe axis. For a 219.1 mm pipe (DN 200, 8 inch) that is 2R = 406, 610 and 1,020 mm. Measured against the outside diameter the radius is smaller than the number suggests – that is why the dimension table gives R and the dimension to the outside of the bend for every size.

Other fittings

Screwed instead of welded: malleable iron threaded fittings and stainless steel threaded fittings. Pressed: press fitting systems.

Fittings and pipes to other standard worlds – JIS, GOST, GB or ISO – are compared side by side in Pipe and fitting standards worldwide.

Your inquiry to Zickwolff

Send us what you have – designation, standard, quantity, date. We will clarify the rest with you.

One item or a question

Send inquiry

Not in stock? We procure it – single items too.

Designation, standard and quantity are enough.

Several items

Send bill of materials

200 items? One parts list is enough – we deliver complete.

Attach it as a file.

Helpful if already known: project and country, date needed, certificates, packaging and language of the packing lists. If anything is missing, we will ask.

It is urgent

Request express

When do you need it? Express delivery, to the site if required.

Tell us by when you need the material – we will tell you what is possible.

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Designs and radii to EN 10253-2 and -4 (table A.1); pictures from our shop, drawings Zickwolff. Dimensions per size on the dimension pages.