ST-55S Large-Bore Lathe

   
 

For the best pricing in your area, contact your local Haas Factory Outlet.

CNC Lathe with 30" x 44" Max Capacity and 12.5" Bore

The Haas ST-55S is a short-bed version of our large-bore ST-55 turning center, providing the same heavy cutting ability, extreme rigidity, and high thermal stability, while taking up less floor space. The twin-chuck capability, high-torque spindle, and large through-bore make the ST-55S ideal for machining heavy pipes and fittings, large couplers, and long rollers. 

  • Front and rear spindle noses (dual-chuck capability)
  • Extra-large spindle nose and spindle bore
  • 2-speed gearbox
  • Fully programmable servo tailstock
  • 12.5" Bar Capacity
  • 1k RPM
  • 55 hp Power
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BUILD & PRICE
Contact Distributor
Capacities S.A.E METRIC
Max Part Swing 35.5 in 902 mm
Max Cutting Diameter (with BOT turret) 30.00 in 762 mm
Max Cutting Diameter (with BMT75 turret) 27.50 in 699 mm
Max Cutting Length (varies with workholding) 44.0 in 1118 mm
Travels S.A.E METRIC
X Axis 20.00 in 508 mm
Z Axis 44.00 in 1118 mm
Feedrates S.A.E METRIC
Rapids on X 472 ipm 12.0 m/min
Rapids on Z 710 ipm 8.0 m/min
Axis Motors S.A.E METRIC
Max Thrust X 5500 lbf 24465 N
Max Thrust Y 2300 lbf 10231 N
Max Thrust Z 9000 lbf 40034 N
Spindle S.A.E METRIC
Spindle Nose A1-20 Front & Rear A1-20 Front & Rear
Drive System 2-Speed Gearbox 2-Speed Gearbox
Max Rating 55.0 hp 41.0 kW
Max Speed 1000 rpm 1000 rpm
Max Torque 4250.0 ft-lbf @ 30 rpm 5762.0 Nm @ 30 rpm
Spindle Bore ø 12.50 in 318.0 mm
Tailstock S.A.E METRIC
Taper MT6 MT6
Travel 42.0 in 1,067 mm
Max Thrust (Acme) 3,000 lbf 13,345 N
Min Thrust (Acme) 200 lbf 890 N
Turret S.A.E METRIC
Number of Tools 12 Stations 12 Stations
OD vs ID Tools Any Combination (will vary with turret) Any Combination (will vary with turret)
Tooling BOT BOT
Live Tooling S.A.E METRIC
Max Speed 95 rpm 95 rpm
General S.A.E METRIC
Coolant Capacity 95 gal 360 L
Air Requirements S.A.E METRIC
Air Required† 4 scfm @ 100 psi 113 L/min @ 6.9 bar
Inline Air Hose 3/8 in 3/8 in
Coupler (Air) 3/8 in 3/8 in
Air Pressure Min 80 psi 5.5 bar
Electrical Specification S.A.E METRIC
Spindle Speed 1000 rpm 1000 rpm
Drive System 2-Speed Gearbox 2-Speed Gearbox
Spindle Power 55.0 hp 41.0 kW
Input AC Voltage (3 Phase) - Low 220 VAC 220 VAC
Full Load Amps (3 Phase) - Low 105 A 105 A
Input AC Voltage (3 Phase) - High* 440 VAC 440 VAC
Full Load Amps (3 Phase) - High* 53 A 53 A

NOTE: All specifications listed are for the standard machine configuration. Optional equipment may change the machine’s specifications.

*Haas machines are designed to operate on 220 VAC (200-240 VAC) power. An optional internal high-voltage transformer (380 - 480 VAC) is available for all models, except the Desktop Machines, CL-1, CM-1, and SR Series routers. This optional high-voltage internal transformer is not field installable; it must be ordered with the machine.

Haas machines destined for Europe and the UK are configured with an internal high-voltage non-isolated transformer to operate on 400 VAC, except the Desktop Machines, CL-1, CM-1, and SR Series routers. 

**Optional tool changers may have a different max tool size than the standard tool changer. Extra-large tools may require two adjacent pockets empty between tools. Click here for toolholder specifications.

ATTENTION! Optional high-performance spindles may have a higher power requirement than the standard spindle. However, if the spindle horsepower (kW) does not change, the power requirement remains the same. Verify the power requirement before running power for your machine.

† Air consumption on 40-taper DC Series machines may be higher, when Through-Tool Air Blast (TAB) is activated.

 

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All prices and specifications subject to change without notice. Freight, rigging, state & local taxes, and dealer installed accessories are not included. Not responsible for misprints or typographical errors. Machines shown with optional equipment. Actual product appearance may differ.