F
foy
Hi guys.
I removed a radiator, for plastering wall behind it, and have found that the (compression?) nut on the tail which tightens onto the valve isn't BSP.
I found that a 3/4 BSP cap fits onto the valve fine but you can't thread the union nut onto a 3/4 BSP plug.
The nut is almost identical in size to the BSP cap but has a finer thread.
I checked further with some metric items (thread file and a thread tap) and it is bang on 1.5 pitch. Also checked with imperial thread gauge and neither 14TPI or 16TPI fit.
It's no major problem as I can re-use the original parts but I'm just curious as to why the maker (Concept) would have used an oddball thread like this when everyone else uses BSP afaik.
I removed a radiator, for plastering wall behind it, and have found that the (compression?) nut on the tail which tightens onto the valve isn't BSP.
I found that a 3/4 BSP cap fits onto the valve fine but you can't thread the union nut onto a 3/4 BSP plug.
The nut is almost identical in size to the BSP cap but has a finer thread.
I checked further with some metric items (thread file and a thread tap) and it is bang on 1.5 pitch. Also checked with imperial thread gauge and neither 14TPI or 16TPI fit.
It's no major problem as I can re-use the original parts but I'm just curious as to why the maker (Concept) would have used an oddball thread like this when everyone else uses BSP afaik.
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