ERT™ Power Section Specification
675ERTcr4570
6.75" 4:5 Lobes 7.0 Stages
Rotor Specifications
Overall Length 202.50 in
Avg. Diameter 3.512 in
Contour Length 195.50 in
Eccentricity 0.354 in
Major Diameter 4.220 in
Head Diameter 4.000 in
Head Length 7.00 in
Weight 566 lb
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 210.00 in
Tube OD 6.75 in
Contour Length 195.00 in
Tube ID 4.080 in
Rubber Cut-back
Side 1: 7.50 in
Side 2: 7.50 in
Weight 1028 lb
Material Alloy Steel
Performance Specifications
Flow Range 300-700 GPM
Rev per Unit Volume 0.48 Rev/Gal
Speed Range 144-336 RPM
No Load Pressure Loss 172 psi
  POB XTH
Max Rec Press 1,730 psi 1,860 psi
Torque @ Max Press 10,180 ft-lbs 10,910 ft-lbs
Stall Pressure 3,170 psi 3,400 psi
Stall Torque 18,630 ft-lbs 19,960 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
C 3.507 0.005 3.508 0.004
0 3.519 -0.007 3.519 -0.007
4 3.528 -0.016 3.530 -0.018
8 3.540 -0.028
 
Reline Lengths (in) Max 210 Min 204
Alt. Stator OD (in)   -   -
Alt. Rotor Diameter (in) - - - -

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

Torque
Differential Pressure (psi) 0 2,000 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 1,000 2,000 3,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 2,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 Torque (ft-lb) 0 5,000 10,000 15,000
Fit Increase
Change in Temperature (°F) 0 50 100 150 200 250 300 Fit Increase (in) 0 0.01 0.02 0.03 0.04 0.05
Speed
300 GPM 500 GPM 700 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 Speed (RPM) 0 100 200 300 400
Mechanical Power
300 GPM 500 GPM 700 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 Mechanical Power (hp) 0 200 400 600 800
©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.