Steel Thickness

The SCA and most Living History groups require a minimum of 16Ga (1.6mm) mild steel or equivalent for helmets, in addition the SCA and most Living History groups require an 18Ga mild or equivalent for all other mandatory pieces of armour such as knees, elbows, kidneys and hands.

Head
Whilst 1.6mmm is considered minimum thickness, the mass of the helmet is an integral part of its protection and for this reason most modern combat helmets are around 2mm. Many extant hemets are however only 1.5-1.6mm.