The CaseIH Steiger 645 is a four-wheel drive (4WD) tractor built by CaseIH, a part of CNH, in Fargo, North Dakota, USA. It is part of the Steiger 4WD Series and has been in production since 2024. The tractor features a powerful FPT Cursor 13 12.9L 6-cylinder turbocharged diesel engine with Tier IV emissions compliance, delivering a rated gross power of 636.2 hp and a maximum gross power of 689.4 hp. It has a 17-speed full power shift PowerDrive transmission and advanced mechanical features including planetary final drives, automatic front and rear differential locks, and articulated power steering. The tractor is equipped with a closed center hydraulic system with multiple pump flow options and a rear IVN hitch with a rear lift capacity of 22750 lbs. The Steiger 645 has a wheelbase of 154 inches and a shipping weight of 50328 lbs, with a maximum capacity of 67000 lbs. Electrical features include a 240 amp alternator with an optional 330 amp upgrade, three 12-volt batteries, and a 950 CCA rating. This model is designed for heavy-duty farm work and offers a comfortable cab with air-conditioning as standard.