Siemens 1FK7 Serie Mode D'emploi page 14

2.1.2.4 Flat gear
Fig. 3 Motor with flat gear (example)
Flat gear/motors are constructed in compact block design with a 2 or 3 stage spur gear,
an extremely flat casing and a long axle distance.
The output shaft is designed as a solid or hollow shaft.
2.1.2.5 Circular gear
Fig. 4 Motor with circular gear (example)
Spur gear/ motors are constructed in compact block design with a 2 or 3 stage spur gear
transmission. The drive and output shafts are coaxial.
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610.40 064.01 Siemens AG