Iron Roughnecks and Tongs

Iron Roughnecks and Tongs spin in and torque up threaded connections on the drill floor. The Category covers iron roughnecks, power tongs for drill pipe and casing, manual rotary tongs with their snub lines, and spinning wrenches. Spare torque wrench assemblies, spinners, die blocks and jaws are included.

Operating principle

An iron roughneck moves to well centre or the mousehole on a rail, pedestal or arm. A spinner turns the upper joint fast at low torque to run the threads in. A torque wrench then clamps both tool joints and applies makeup torque, or breakout torque to undo the connection. A mud bucket around the joint catches fluid on breakout.

Power tongs do the torque step hydraulically with a backup jaw on the lower joint. Manual tongs are latched on by hand, pulled by a winch or cathead, and held by a snub line on the backup tong.

Configurations

Rail-mounted, pedestal-mounted and arm-mounted iron roughnecks.
Combined units with spinner and torque wrench, or separate spinning wrenches.
Drill pipe power tongs and casing tongs, often with an integral backup.
Manual rotary tongs with interchangeable lug jaws for different sizes.

Key specifications

Parameter	Why it matters	Typical classes or units
Makeup torque	Must reach the makeup torque of your largest connection	ft-lb or kN·m
Breakout torque	Must exceed makeup, since connections tighten downhole	ft-lb or kN·m
Tool joint OD range	Pipe sizes covered without changing dies	in or mm
Spinner speed and torque	Spin-in time and ability to turn heavy joints	rpm and ft-lb or kN·m
Reach and mounting	Must cover well centre and mousehole	ft or m
Control interface	Zone management with racker and top drive	OEM control platform

Standards and certification

API 7K covers manual tongs, including their load-limiting design, and the snub lines for manual and power tongs. API RP 7G gives recommended makeup torque values for rotary shouldered connections, which is how you size a roughneck against your string. Iron roughnecks are mostly designed to OEM standards and approved by class as part of the drilling plant. Electrical parts need Ex certification for the drill floor zone.

Failure modes and inspection

Worn die inserts and damaged die carriers, which let the tool slip and mark the pipe.
Leaks and scoring in clamp cylinders and the torque cylinder.
Spinner roller wear, motor wear and gear damage.
Torque reading error. Most roughnecks infer torque from hydraulic pressure, so the pressure transducer and calculation need calibration.
Hinge pin, latch and jaw cracks on manual tongs, found by MPI.
Snub line wear and load cell faults.

An inspection checks clamp and torque cylinders, dies and spinner, and verifies torque output against a calibrated load cell or torque test rig across the working range.

Documentation

OEM service history and upgrade kits fitted.
Torque calibration certificate with date and method.
Software version and torque-turn records if the unit logs them.
MPI reports on manual tong jaws, latches and hinge pins.
API 7K nameplate data for manual tongs and snub lines.

Integration and compatibility

Check the tool joint OD range against your drill pipe, heavy weight and collars. Confirm reach to well centre and the mousehole from the mounting point on your floor. The roughneck's hydraulic supply must match its pressure and flow needs. The control system has to work inside your zone management, because the roughneck moves into space the top drive and racker also use.

Refurbishment and recertification

A typical overhaul fits new dies and die carriers, reseals the cylinders, rebuilds the spinner, checks the control valves and recalibrates torque. Some OEMs offer upgrade kits that raise torque on an existing frame, so confirm which version you are looking at. Manual tongs and spare lug jaws often come as unused surplus and need only an MPI and a check of rated torque.

Common makers include NOV, HMH and Canrig. Match tool joint range with the pipe racking systems that feed the roughneck and the elevators and slips that hold the string.

FAQ

Frequently asked questions

How much torque does an iron roughneck need?

Your iron roughneck needs makeup torque above the API RP 7G value for the largest connection you run, and breakout torque well above that. Connections often tighten further while drilling, so breakout needs more margin than makeup. Check drill collars and heavy weight pipe as well as drill pipe.

Do used iron roughnecks need torque calibration?

Yes, recalibrate torque before a used roughneck goes back into service. Most units calculate torque from hydraulic pressure, so a drifted transducer gives wrong readings and over or under torqued connections. Ask for the last calibration certificate and the method used.

Are manual tongs still needed on rigs with an iron roughneck?

Yes, most offshore rigs keep manual tongs as backup and for tubulars or tools the roughneck cannot grip. API 7K covers their design and their snub lines. Inspect hinge pins, latches and jaws by MPI, and check the snub line and its load cell.

Can an iron roughneck be upgraded to higher torque?

Some can, through OEM upgrade kits that replace the torque wrench or cylinders on an existing frame. Check the serial number and service records to see which version you have. Confirm the higher torque against your hydraulic supply and recalibrate after the upgrade.

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