Anyone know the thread type for the screws on KeeKlamp / Tube Clamp fittings.

[CompoSimmonite]

I've a large quantity of KeeKlamp and Tube Clamp fittings in 48mm / scaffolding tube size. Some have no screws and the threads have light rust so I'd like to run a tap down to clean them but can't find any specs to the right type.
Before I write to the manufacture does anyone know what size tap I'd need to buy ?
Cheers

 

[Seadog]

Spare Grub Screw 27mm/34mm Buy Key Clamps Online

Spare grub screw. These grubscrews are supplied pre fitted into the fittings as standard, but the professional always carries spares.

www.keyclampstore.com

 

[carbonarc]

For 48.2mm clamps the sett screws should be 3/8" BSP. The diameter is 0.656" [16.66mm]. The pitch is 0.0526 which works out at 19 TPI.

 

[Hitch]

Pretty sure genuine Kee ones are BSP from memory, small one ¼"bsp, larger ⅜"bsp.

But if they are mixed brands, you may have differences. I've had some other brands with metric threads in the past.