Hoselock fittings, still doing battle

Harry Bloomfield

Harry Bloomfield

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I'm struggling with 3/4 BSP to hoselock male fittings. Garden taps are 3/4 BSP parallel threads. I want a 3/4 BSP parallel to hoselock male fitting, which will screw into a 3/4 BSP parallel thread. I have three such adaptors, but they seem to all be taper 3/4 BSP. What am I missing, why would they be taper threads? They screw in a couple of turns, then jam and not go further - have I just been unlucky with the fittings in my hoselock stock?
 
I would suggest - and this will be no help whatsoever - that the threads are different and not tapered.
I'd try a modern bibcock tap, and see if they fit that one.
John :)
 
All of my female 3/4 BSP fit everything I try them on, it just the 3/4 male BSP threads I seem to be struggling with, on adaptors.
 
CBW said:
Have you considered https://www.bes.co.uk/catalogsearch/result/index/?q=garden+tap and ask them the question about the threads?
Click to expand...

This is what I am looking for, but no ads mention whether they use the taper of parallel threads.

www.ebay.co.uk

Hoselock Type Hose Quick Connectors / Valves Male Adaptor | eBay

QUICK GUIDE TO PIPE AND THREAD SIZES. Advice and Support. This does not affect your statutory rights. The item that you receive may vary slightly from the image shown.
www.ebay.co.uk
 
Harry Bloomfield said:
This is what I am looking for, but no ads mention whether they use the taper of parallel threads.

www.ebay.co.uk

Hoselock Type Hose Quick Connectors / Valves Male Adaptor | eBay

QUICK GUIDE TO PIPE AND THREAD SIZES. Advice and Support. This does not affect your statutory rights. The item that you receive may vary slightly from the image shown.
www.ebay.co.uk
Click to expand...
They look parallel imo similar to this one https://www.amazon.co.uk/HOZELOCK-R...ocphy=1006912&hvtargid=pla-442388811559&psc=1
 
Could it be that its not meant to suit your application, don't male parallel threaded couplings have a flange for a sealing washer and taper threads don't as they require a thread sealant?
The threads of the fitting linked to is mostly used to fit into things like trigger water guns, sprinklers etc so unless an internal seating washer was present a thread sealer would be needed.
 
lostinthelight said:
Could it be that its not meant to suit your application, don't male parallel threaded couplings have a flange for a sealing washer and taper threads don't as they require a thread sealant?
The threads of the fitting linked to is mostly used to fit into things like trigger water guns, sprinklers etc so unless an internal seating washer was present a thread sealer would be needed.
Click to expand...

Parallel threads seal at their end faces, and should screw in easily, until the face hits the seal. Taper seal along the actual threads.

The adaptors I have, certainly look as if they are capable of the face seal.
 
Harry Bloomfield said:
Parallel threads seal at their end faces, and should screw in easily, until the face hits the seal. Taper seal along the actual threads.

The adaptors I have, certainly look as if they are capable of the face seal.
Click to expand...
Just looked at a few different sprinklers and have internal washers. Have you tried a vernier each end to see if threads parallel , if so threads don't match or female thread damaged?
 
My test with my vernier, suggest the tops of the threads are parallel, I'm unsure of the depth of the thread, but they look perfectly regular. All the hoselock threads apart from these, taps etc. which I have tested, are all obviously parallel threads, using a flat rubber washer to form the seal, at the end of the fitting.

I've not been able to get any sensible reply from any sellers, I went out and tried to find them in local stores and found none, so I have ordered some via ebay.
 
Have you measured how far the fittings are screwing on to the tap with the vernier.
 
just pumps said:
Have you measured how far the fittings are screwing on to the tap with the vernier.
Click to expand...

My female fittings screw on until they hit the sealing washer, remove the washer and they easily screw on further. The male adaptors, will not screw into the females more than a couple of turns. These are three different adaptors, all from my box of a motley collection of hozelock type fittings and adaptors.
 
maybe the tap has a different threads per cm/inch? One of the things you are tying to fit to is not what you think it is?
 
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