1. Facing according to DIN 2526
Flat face:
Form A, Face without any requirements
Form B, Face Rz=160, machined (not smoother than 40μm)
Raised Face:
Form C, Face Rz=160, machined (not smoother than 40μm)
Form D, Face Rz=40, machined
Form E, Face Rz=16, machined

2. Tongue and groove according to DIN 2512
Form F, Tongue
Form N, Groove

3. Male and Female according to DIN 2513, DIN 2514
Form V13, V14, Male
Form R13, R16, Female