TOS Trens SN71C

SN71C is universal centre lathe designed for piece and small-lot production for turning workpieces of bigger dimensions.It is suitable for maintenance and repair divisions as well.  It has wide range of operational speeds and its unique execution ensures high stability in material machining.

Most important features:

  • Easy maintenance
  • Long lifetime
  • Low operating costs
  • Easy and ergonomic control
  • High turning precision
  • Various versions with wide range of optional accessories
SKU: 6.TOS.C.SN71 Categories: ,


Machines of outstanding performance designed for piece and small-lot production suitable also for maintenance and repair divisions. TRENS lathes are precise and reliable machines in wide range of versions and optional accessories.


  • Easy maintenance
  • Long lifetime
  • Low operating costs
  • Simple and ergonomic control
  • High turning precision
  • Possibility to cut all types of threads with wide range of pitches
  • Wide range of optional accessories – digital read-outs, quick-change tool posts, steady and follow rests, rolling contact bearings for steadies, micrometric stops, taper turning attachments, faceplates and chucks

Universal centre lathes belong to the most requested products of production portfolio of company TRENS SK, a.s.. Since half of the twentieth century they were known under the brand TOS (currently TRENS) and are still fulfilling the highest customers´ requirements. Thanks to persistent quality and sustaining development TRENS SK reaches leading places among world producers of universal center lathes. The result is more than 100 000 sold lathes throughout the globe and satisfied customers that repeatedly choose brand TRENS.


  • Metric execution
  • Spindle nose Bayonet B8 (DIN 55027 & ISO 702-III)
  • Spindle bore Ø 73,5 mm
  • Four way tool post
  • Electrics for 3 x 400 V / 50 Hz, circuit brakers
  • Right hand handwheel
  • Maximal swing in gap 960 mm in distance 300 mm from front of spindle nose
  • Rapid traverse
  • Tailstock
  • Main motor output 7.5 kW
  • Chip pan and coolant device
  • Halogen lighting
  • Steel hoses cable carrier
  • Folding handle for X axis
  • Folding handle for Z axis
  • Chuck guard Ø 315 mm with safety switch
  • 1, Execution non CE: without front chip guard, rear guard, lead screw and draw bar guard
  • 2, Execution CE: with front chip guard, rear guard, lead screw and draw bar guard
  • Colour – RAL 7035 / 7016 / 6153
  • Set of exchange gears for cutting of threads
  • 3 pcs of shear pin
  • Operator kit
  • Operator manual on CD, documentation
  • Dead center Morse 5
  • Reduction sleeve from Metric 80 to Morse 5
Working range
Swing over bed mm 710
Swing over cross slide mm 420
Swing  in bed gap mm 960
Swing  in bed gap  with Digital readout mm 900
Useful lenght in gap from front of spindle nose mm 300
Distance between centres (d.b.c.) mm 1500, 2000, 3000, 4000
Height of centres mm 355
Bed width mm 450
Range of spindle speeds min-1 10 – 1000
Number of spindle gears 16
Spindle nose ISO 702/III – B8
ISO 702/II – D8*
Spindle bore mm 73.5
Internal taper Metrický 80 / 80/1:16*
Max. torque/limit speed Nm/min-1 2400/20
* optional execution
Working travel of cross slide mm 400
Working travel of tool slide mm 180
Max. tool size mm 40 x 25
Number of feeds 38
Working range of longitudinal feeds mm.rev-1 0,05 – 6,4
Working range of cross feeds mm.rev-1 0,025 – 3,2
Longitudinal rapid traverse mm.min-1 3000
Cross rapid traverse mm.min-1 1500
Cross resetting of tool slide o  angle ±90
Tailstock sleeve diameter mm 90
Tailstock sleeve travel mm 240
Tailstock sleeve internal taper Morse 5
Cross resetting mm ±10
Metric threads No./mm 29 / 0,5 – 40
Whitworth threads No./TPI 38 / 1 – 80
Modular threads No./mm 26 / 0,25 – 20
Diametral Pitch threads No./No. 31 / 2 – 72
Maximal workpiece weight
Max. workpiece weight clamped centres with limit speed 45 min-1 * kg 1500
Max. workpiece weight clamped in chuck, workpiece with centre of gravity 100 mm from chuck front with limit speed 45 min-1 * kg 110
*Valid for clamping devices (part of optional equipment) delivered or produced in production plant. The recommendations of other clamping devices  producers must be followed by using of clamping device from other producers ( workpiece  shape, workpiece extension from clamping device, workpiece unbalance, cutting conditions, etc.)
Total input kVA 12/17*
Main motor output kW 7,5/11*
Coolant pump output kW 0.09
Rapid traverse motor output kW 0,94/0.55**
* optional execution with 11kW main motor
** for voltage different than 400V and 220V
Width x Height mm 1210/1445* x 1600
Lenght/Weight for d.b.c. 1500 mm mm/kg 3495/ 2960
Lenght/Weight for d.b.c. 2000 mm mm/kg 3995/ 3080
Lenght/Weight for d.b.c. 3000 mm mm/kg 4995/ 3300
Lenght/Weight for d.b.c. 4000 mm mm/kg 5995/ 3580
* optional execution with11kW main motor
Operational data:
Supply voltage V 3 x 400V ±10%
Supply frequency Hz 50Hz ±2%
Temperature range of ambient  o Celsius +5 až +40
Achievable accuracy of machining IT 7