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  • ROTOCON ERGT-500-1970-AA Through Hole Rotary Ground
  • High Current Plating Ground



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ROTOCON® ERGT Series Model Specifications

»  Provides consistent low and stable resistance for high current applications»  Robust industrial design provides reliable long lasting performance
»  Requires ZERO grease or routine maintenance»  Remains unaffected by RPM or total number of revolutions

ROTOCON ERGT Series Rotating Electrical Grounds are designed with a through-hole to mount onto a shaft and conduct electricity around, or to the shaft.  This is advantageous if media such as welding gases and other fluids pass through the center, or the location of the rotary ground cannot be at the end of a shaft or assembly. The ERGT Series is available in bore diameters ranging from 0.50″ to 2.50″ and up to 3,000 amps of current standard, with additional customization options available.

Alternatively, if there is access to the end of the rotating assembly or shaft, our full line-up of ERG Series rotary grounds are a great fit, that are an in-stock, and a more economical choice.

Stop settling for less, it’s time to upgrade from your problematic Lenco and Tweco Rotary Grounds. Watch how Meridian Laboratory’s ROTOCON® Rotary Grounds outperform all other types of rotary ground solutions!

YouTube video

Watch our head-to-head comparison of different types of rotary grounding solutions!

YouTube video

Brushed rotary ground clamps and other traditional products on the market provide poor grounding capabilities, require constant grease maintenance and have a high arcing potential. This leads to machines operating at decreased current levels with variances in penetration, weld quality, and ultimately scrapped product.

YouTube video


ERGT Series Rotary Grounds are designed with a through-hole to mount to a shaft and conduct current to or through.  Watch the video above for more information on mounting of high-current, through-hole rotary grounds.

Learn more about best practices for installation, or Contact Us with any questions.


Meridian Laboratory
2415 Pleasant View Rd.
Middleton, WI 53562
Phone (608) 836-7571
T. Free (800) 837-6010
Request an ERGT quote


  • Available in amperages 500-3,000A+
  • Bore-hole diameters ranging 0.250″ to 2.50″
  • Low and stable contact resistance – steady and consistent current delivery
  • Maintenance free – does not require grease or adjustment of any type
  • Unaffected by RPM and rotations over time
  • Environmentally sealed and durable construction
ROTOCON ERGT-500-1970-AA Through Hole Rotary Ground


  • Rotary welding
  • Rotating electro-plating & polishing
  • Plasma cutting
  • Rotary magnetrons/sputtering deposition
  • Welding cable reels
  • Lightning strike grounds (up to 100,000A tested)
  • Electro-polishing
Custom rotating electrical ground with through-hole rated to 250 amps
ROTOCON ERGT-500-1970-AA Through Hole Rotary Ground
Custom rotating electrical ground with through-hole rated to 250 amps

Through-Bore Rotary Ground Models

MCT Series

Model #
(Specify preferred hole diameter as XXXX)
Minimum Hole Diameter (HD)Maximum Hole Diameter (HD)Max Current (Amps)Total Length (TL)Outside Diameter (OD)Number of Conductive Studs on BodyStud Size / ThreadRPM (Continuous / Momentary)
ERGT-500-XXXX0.250"2.000"500A4.55"4.3"11/2"-13200 / 400
ERGT-1000-XXXX0.250"2.000"1000A4.55"4.3"21/2"-13200 / 400
ERGT-1500-XXXX0.250"2.000"1500A4.55"4.3"31/2"-13200 / 400
ERGT-2000-XXXX0.250"2.000"2000A4.55"4.3"41/2"-13200 / 400
ERGT-2000-XXXX1.000"2.500"2000A5.187"6"41/2"-13150 / 300
ERGT-3000-XXXX1.000"1.000"3000A5.187"6"61/2"-13150 / 300
NoteThrough-Hole diameter can be specified at time of order to exact dimension; standard tolerance of bore is +0.003" / -0.000"Assumes 100% duty cycle of direct current (DC); alternating current (AC) will have lesser ampacity ratingAll conductive studs must be used to guarantee rated amperage maximum
Need a different size or arrangement? Custom models are available, contact Meridian Laboratory for other models, and specific information.