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TDS-11SA Top Drive
TDS-11SA Top Drive
Portable Electric Top Drives

The TDS-11SA is the most prolific top drive in the world today. Since its inception into the drilling industry, its superb performance has driven demand to make it the most recognizable and popular top drive on the market.

For questions contact:

Land Rig Solutions
10000 Richmond Avenue
Houston, TX 77042
Phone: 713-346-7500
Fax: 713-435-2195

Small PDFTDS-11SA Flyer
Direct Connect TD

NOV understands that time means money. Use the Direct Connect email link above and we will respond within 24 hours. If we can't answer your question, we will direct you to an NOV expert. If you are in a rig down situation, contact 24/7 technical support at 281 569 3050. 


  • Most Popular Top Drive:  National Oilwell Varco's TDS-11SA AC Top Drive is an AC-motor-powered top drive developed for use as a portable or permanent unit on a wide variety of land and offshore rigs.  The TDS-11SA is adaptable to almost any derrick or structure, making it one of the most prominent 500-ton drilling applications, with over 1,700 units shipped. 
  • More Power, Smaller Package:  The TDS-11SA applies a powerful drilling application in a compact package achieving 37,500 ft-lbs of continuous drilling torque, and 55,000 ft-lbs of make-up/break-out torque.  
  • Greater Control:  The TDS-11SA is driven by a Variable Frequency Drive (VFD) control system for a greater range of torque and speed performance.  Because of the broad speed and torque range of AC motor technology, this impressive performance is obtained using a single-speed gear box. 
  • Innovative Technology:  NOV has been at the forefront of top drive technology since the first prototype concept development in 1982, and the TDS-11SA reinforces NOV's commitment to innovation and drilling technology advancements.
Reliable Power High performance dual AC Motors and Variable Frequency Drive 
Portability Remains affixed in derrick or mast during transport
Low MaintenanceNo brush gear or commutator; no stand-alone hydraulic supply
Improved Economy Reduced fuel consumption; faster rig-up/down times
More ControlFaster and more reliable directional drilling
Personnel SafetyReduced crew size on the drill floor



Gear ratio

10.5:1 Double Reduction Helical


Force-fed, filtered, air-cooled

Drilling Parameters 


Drilling speed range

0 to 228 rpm continuous

Drilling torque

37,500 ft.-lbs. (50 842 Nm) continuous

Drilling horsepower

800 HP maximum continuous

Static lock brake

39,000 ft.-lbs. (47 455 Nm)

Maximum intermittent torque

55,000 ft.-lbs. (74 569 Nm)

Rating Capacities 



500 ton, API-8C, PSL-1

Water course

3 in. @ 5,000 psi CWP

Drilling Motors (two) 



Reliance Electric, AC induction, forced air cooled, designed for AC drive applications

Horsepower rating

400 HP each

Speed rating

1,200 rpm

Maximum speed

2,400 rpm

Pipe Handler (Type PH-75)


Torque capacity

75,000 lb ft (101 686 Nm) @ 2,000 psi

Drill pipe range

3½ in. to 6⅝ in. (4 in. to 8½ in. OD tool joint)

Upper IBOP

6⅝ API Reg. RH Box

Lower IBOP

6⅝ API Reg. RH Pin/Box

IBOPs; rating pressure

15,000 PSI CWP

IBOP trim

H2S trim (optional)

Elevator links

250, 350, 500 or 750 ton API, 108 in., (2.7 m) long

Rotating head

Infinitely positionable

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Land Rig Solutions