NEMA 17 type, part number FL42STH47-1204 from Motion Control Products Ltd, webpage http://www.motioncontrolproducts.co.uk/product_info.php?cPath=4&products_id=47.
Basic details are Voltage: 4V, Current (phase): 1.2A, Inductance (Phase): 6mH, Holding Torque: 45Ncm, and it is a 1.8 degree stepper. Heavy, though at 150 g, but cheap at £9.26 each.
From trials of other motors it seems that the holding torque never gets to the rated values (of ~ 0.3 Nm and upwards) on the motors tried by others because of the current (ie electric current A) limits imposed by the controller electronics.
That's if I understand it....
Motion Control Products sub-total = £45.75 inc P&P
- Stepper motor, part number FL42STH47-1204, £9.26, x 3
Running total = £142.77