Base: Steel, forged, black powder coat paint finish
Parts in sheet metal: Case-hardened C10 steel,
zinc plated, blue passivated finish
connecting rod: St. 37 steel, zinc plated, yellow passivated finish
Bearing bolts are case-hardened
Double-action air cylinder, maximum pressure 6 bar
All mobile sections lubricated with special grease
Toggle clamp spindle assemblies not included; see index to assemblies HERE
The working principle of GN 890 pneumatic push-pull toggle clamps is identical in construction and dimensions to the GN 842 manual plunger clamp. To ensure an extended life of the mechanical parts as well as the air cylinder the operating pressure should not exceed 6 bar.
In addition a lubrication control unit should be mounted in the air in-feed line. The sturdy mounting frame for the cylinder has been designed to avoid the trunions of the cylinder protruding over the frame.
GN 890 Pneumatic push-pull toggle clamps are also available from size 360 up as version M (with magnetic piston). In conjunction with a proximity switch (GN 896.1 / GN 896.2) the position of the piston is sensed and the generated signal can be used in sequence control systems.
See also General Information on Toggle Clamps.