| SPECIFICATION | C6251(B) | C6256(B) |
| Swing over the bed | 510mm | 560 mm |
| Swinging over a cross slide | 300 mm | 350 mm |
| The scope of the gap | 738 mm | 788mm |
| Length in gap | 200 mm | |
| Distance between centers | 1000/1500/2000/3000mm | |
| Bed width | 350 mm | |
| Spindle nose | D1-8 | |
| Spindle hole | 80mm/105mm (optional) | |
| Spindle bore taper | #7Morse | |
| Spindle speed range | 12 changes 25-1600 rpm (optional: variable, 30-1700 rpm) | |
| Max. stroke of compound stop | 130 mm | |
| Max. cross slide stroke | 326 mm | |
| Lead screw pitch | 6mmOr4T.PL | |
| Max. cross-section of the tool | 25×25mm | |
| Range of longitudinal feeds | 35 types0.059-1.646 mm/rev | |
| Cross feed range | 35 types0.020-0.573 mm | |
| Metric thread range | 47 types0.2-14 mm | |
| Inch thread range | 60kinds2-112T.PL | |
| Range of diametrical steps | 50 types 4-112 D.P. | |
| Module step range | 39 species0.1-7M.P. | |
| Tailstock sieve diameter | 75 mm | |
| Tailstock bushing stroke | 180 mm | |
| Tailstock Bushing Morse Taper | #5Morse | |
| Lateral adjustment | 13 mm | |
| Main engine power | 7.5 kW (10 hp) 3 phase | |
| Coolant pump power | 0.1 kW (1/8 hp), 3 phase | |