HK40 was first introduced to the market in Bauma Germany exhibition in 2007. During the event, HK40 was one of the six new products Tadano has displayed at its booth. The truck-mounted crane HK40 the successor to its existing HK35 and HK35SL.
The HK40 can be mounted on either three or four axles, having a 10.45 to 35.2 metres four-section boom that can telescope in 105 metres. A 9-metre extension can be offset at 0, 20 or 40 degrees. Powering the crane will be a four-cylinder 88 kW (118 HP) Mercedes-Benz engine. The three-axle version can carry either no counterweight onboard (0-tonne) (26 tonnes GVW), 2.1 tonnes counterweight (27.5 tonnes GVW), 4.5 tonnes counterweight (31 tonnes GVW), while the larger four-axle machine carries a basic 4.5 tonnes of counterweight.