The scaffold board retaining coupler is a type of board clamp. Normally it is pointed to forged BS1139 EN 74 standard and British-type board clamps. Called BRC couplers too.
The forged scaffold board retaining coupler elements include a forged BRC coupler cover, a pressed BRC body, a set of fork bolts and nuts, and a rivet connection between the body and cover.
Forged board retaining couplers are used popularly in tube and clamp systems. It is used to form and fix scaffold platforms in construction. According to the plank height, the board retaining couplers are in customized heights to be compatible with the plank height/thickness.
There are also pressed type EN74 standard board retaining couplers, which with pressed scaffold coupler covers, rather than forged covers. Both the forged and pressed BRC couplers are used to connect with standard OD48.3mm scaffold tubes/transoms.
If you want light weight and cheaper scaffold board clamps, there are also limpet clamps and toe board clamps. In function, they are similar, used to fix scaffolding boards and planks to scaffold structures.
For anti-corrosion purposes, there are zinc-plated and hot dip galvanized board retaining clamps. If you want to identify scaffold BRC couplers, they could be marked with your favorite color painting.