The standard orbital head attachment. Generally with a 6" forming angle, the HS Series requires less downforce, inducing minimal shank and rivet shoulder swell. This allows for parts like permanently formed articulating hinges.
The HL Series has a longer reach forming peen, making it easier to form the rivet. It is normally available with a 4º forming angle, with some ranging from 3° to 6°, requiring more downforce than the HS Series. With the extra downforce, shank swell is a possibility, making formed rivets locked in place and more resistant to joint fatigue.
Gold Series heads are heavy duty and provide a greater thrust capacity in a small package. Upgraded sealed bearing configurations give it increased capacity compared to the standard orbital heads. Orbitform Gold Series heads are excellent for forming harder materials, and will not wear out from extended use.