Threaded pipe

[dgs2001]

Wolseley or BSS pipefitting merchants. or any local pipe merchant should stock all the pipe and fittings you need.

 

[Bingy man]

Black iron fittings as they were also known are not available in normal diy stores like b n q and Toolstation etc . They are available from specialist stores like plumb centre and city plumbing or as mentioned online .

 

[Ian Mellin]

Is this something you have measured yourself or have perhaps misread from the instructions?

Please link to the product you have bought.

There is no standard pipe that is 3/4" outside diameter nor any standard pipe thread that is 3/4" diameter.

Pipe, because it generally has stuff flowing inside it, is specified by its nominal INSIDE diameter. Thus a 3/4" pipe will be nominally 3/4" plus two wall thicknesses outside diameter. A 3/4" nominal pipe would use a 3/4" BSP thread, see table below for thread major diameters.

https://v-flowsolutions.co.uk/british-pipe-threads/
Galvanised pipe does not work well with the non-threaded part of the clamp (that grip the pipe) as the galvanising is 'slippery'. Black pipe is better for the application. Clearcoat it for corrosion protection if needed.

Description



Neilsen 4pc Professional Wood Gluing Pipe Clamp Woodworking Cast Iron 3/4" Set
Just slide the pipe clamp through any length 3/4 in. pipe to hold wood in place for gluing and drilling.
Constructed of tough cast iron that keeps wood steady as you work.
Four plate clutch for high clamping pressure, quick release.
Heavy duty lead screw.
Perfect for wood workers working on cabinets and wooden boxes.

 

[Ian Mellin]

It sounds like you have the lighter duty clamp heads. 3/4" O/D pipe is in fact 1/2" gas barrel as the pipe is sold by the bore size. It comes in black or galvanised. Plumbers merchants may stock it but I sourced my [larger] pipe from a metal merchants, in lengths of 6.3m, I think. My plumber friend lent me his die set and I threaded the pipe in the cut lengths of my own making, at 1m and 1.5m. In 20+ years of use I've not had any problem with the claws on the tail ends slipping on the galvanised pipe I've used.

Colin

Description



Neilsen 4pc Professional Wood Gluing Pipe Clamp Woodworking Cast Iron 3/4" Set
Just slide the pipe clamp through any length 3/4 in. pipe to hold wood in place for gluing and drilling.
Constructed of tough cast iron that keeps wood steady as you work.
Four plate clutch for high clamping pressure, quick release.
Heavy duty lead screw.
Perfect for wood workers working on cabinets and wooden boxes.

 

[eribaMotters]

3/4" iron pipe is a standard size for pipes in plumbing and heating systems. The term “3/4 inch” refers to the inner diameter of the pipe, which is approximately 0.824 inches or 20.93 millimeters

This may also be of use:-
https://www.pipeworksuppliers.co.uk/collections/black-malleable-iron-pipe-fittings
Colin

 

[HOJ]

In all the years I've been buying "pipe" if I ask for 3/4 its what it is, its not 1/2" or an 1", or have I missed something in getting on for 50 years of being on the tools.

 

[Bingy man]

If I buy a 1/2 inc rad valve it’s external size is 1/2 “ and it’s then screwed into a 1/2 female thread - so 1/2 “ or 3/4 or whatever size is what it is - the only difference is whether it is internal or external - maybe that’s where the confusion lies ..

 

[HOJ]

maybe that’s where the confusion lies ..

The op only bought some 3/4 pipe clamps, were not tubing up a boiler house, are we! maybe its me...

 

[ChaiLatte]

...have I missed something...

You appear to have missed reading the first, original, opening post of this thread.

Quoting the OP's words from that post, "The pipe required is 3/4 inch O/D". All following discussions of size have been made to disabuse him of this notion.

 

[eribaMotters]

HOJ,
I don't believe the op has bought 3/4" pipe clamps, but 1/2" pipe clamps and these require the 3/4" o/d pipe. This pipe has an i/d of 1/2" and hence the classification or sizing of the clamps.
Pipe clamps are an American invention and I believe the confusion is due to how they classify pipe.

I bought 20 sets of 3/4" pipe heads some years ago, 10 x Pony and 10 x Axminster. Here you will see an example of the Axminster in original packaging that clearly says "use any length of 3/4" threaded pipe".
The pipe needed for these clamps is just over 1" o/d, which is 3/4" i/d.

Colin

 

[poshpaws]

I have no firm info to add to all the above; but a comment:

Are you SURE you can't get both bore sizes, black or galvanised, with or without threads (BSP) plus T's, elbows, straight connectors, etc at any DIY store in UK???

If so I'm surprised - here in Switzerland you walk into any Jumbo, CoopHobby, or Migros Do-It (all v similar to UK B&Q, Homebase, etc, etc) and there are racks of pipe and drawers full of fittings. Prices are not unreasonable either.

Man I miss Jumbo
But not there prices

 

[Bingy man]

https://www.diy.com/search?term=3/4+inch+pipe+fittings

 

[Bingy man]

Bnq are about the largest diy outlet in the uk along with a few others . In a complete emergency I’d be happy to buy the odd fitting but look at the prices , other chains just don’t sell them so as per my previous posts you have to go online or a specialist outlet .

 

[cmoops2]

I think we may have become a bit fixated on 3/4" being related to the pipe OD whereas it actually refers to to the BSP 'thread' size (see chart below).

(also see post from eribaMotters above where he mentions that the pipe for his Pony and Axminster clamps are just over 1" OD (1.014).

Another fact that can be gleaned from this chart (and one that causes great confusion amongst those who don't use BSP threads very often) is that the lower BSP sizes (particularly 1/8", 1/4" and 3/8"), are related to pipe OD's that are virtually twice the size of the BSP 'thread' size ...

I have several Axminster pipe clamps and a box of various lengths of 'black' pipe and an assortment of 3/4" BSP fittings that can be used to make up all sorts of configurations - see pic of a panel clamp concept ('borrowed' from an American woodworking site a few years back).