Hoselock fittings, still doing battle

[Harry Bloomfield]

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?

 

[just pumps]

What happened to the orignal post?
Have you tried the fittings on another tap?

 

[Burnerman]

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

 

[Harry Bloomfield]

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]

Have you considered https://www.bes.co.uk/catalogsearch/result/index/?q=garden+tap and ask them the question about the threads?

 

[Harry Bloomfield]

Have you considered https://www.bes.co.uk/catalogsearch/result/index/?q=garden+tap and ask them the question about the threads?

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

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

 

[CBW]

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

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

They look parallel imo similar to this one https://www.amazon.co.uk/HOZELOCK-R...ocphy=1006912&hvtargid=pla-442388811559&psc=1

 

[Harry Bloomfield]

They look parallel imo similar to this one https://www.amazon.co.uk/HOZELOCK-R...ocphy=1006912&hvtargid=pla-442388811559&psc=1

The ones I have look parallel, but they only screw in a couple of threads, before they jam solid.

 

[lostinthelight]

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.

 

[Harry Bloomfield]

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.

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.

 

[lostinthelight]

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.

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?

 

[Harry Bloomfield]

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.

 

[just pumps]

Have you measured how far the fittings are screwing on to the tap with the vernier.

 

[Harry Bloomfield]

Have you measured how far the fittings are screwing on to the tap with the vernier.

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.

 

[Mike13]

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?