ERT™ Power Section Specification (Metric)
500ERT6764
127 mm 6:7 Lobes 6.4 Stages
Rotor Specifications
Overall Length 4483.1 mm
Avg. Diameter 67.60 mm
Contour Length 4330.7 mm
Eccentricity 5.23 mm
Major Diameter 78.05 mm
Head Diameter 86.74 mm
Head Length 152.4 mm
Weight 127 kg
Thread Form NC23 API
Stator Specifications
Overall Length 5080.0 mm
Tube OD 127.00 mm
Contour Length 4267.2 mm
Tube ID 80.67 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 609.6 mm
Weight 184 kg
Material Alloy Steel
Performance Specifications
Flow Range 568-1136 LPM
Rev per Unit Volume 0.21 Rev/L
Speed Range 118-236 RPM
No Load Pressure Loss 1027 kPa
  POB XTH
Max Rec Press 11,780 kPa 12,620 kPa
Torque @ Max Press 7,930 N-m 8,490 N-m
Stall Pressure 21,550 kPa 23,090 kPa
Stall Torque 14,510 N-m 15,540 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
1 67.77 -0.17 67.77 -0.17
2 67.84 -0.24 67.84 -0.24
3 67.97 -0.37 67.97 -0.37
 
Reline Lengths (mm) Max 5080 Min 4928
Alt. Stator OD (mm)   -   -
Alt. Rotor Diameter (mm) - 67.488 - -

Max DP for reliable operation will vary based on
operational conditions. Refer to ERT Operational
Guidelines for guidance.

Torque
Differential Pressure (kPa) 0 10,000 20,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 50 100 150 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 10,000 20,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 10,000 20,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Torque (Nm) 0 5,000 10,000
Fit Increase
Change in Temperature (°C) 0 20 40 60 80 100 120 140 160 180 Fit Increase (mm) 0 0.2 0.4 0.6 0.8 1
Speed
568 LPM 852 LPM 1136 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Speed (RPM) 0 100 200 300
Mechanical Power
568 LPM 852 LPM 1136 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Mechanical Power (Kw) 0 100 200 300
©2026 NOV. All rights reserved. Except as noted, all trademarks referenced in this document are trademarks of NOV. Performance curves describe theoretical performance with 175°F (79°C) water and are for reference only. Operational fit and drilling conditions will affect performance. Operation above maximum recommended limits will reduce life. Specification data are subject to change without notice.
PS App v.