ERT™ Power Section Specification
512ERT5695
5.125" 5:6 Lobes 9.5 Stages
Rotor Specifications
Overall Length 252.50 in
Avg. Diameter 2.803 in
Contour Length 245.00 in
Eccentricity 0.232 in
Major Diameter 3.268 in
Head Diameter 3.100 in
Head Length 7.50 in
Weight 456 lb
Thread Form 2.438" XDV
Stator Specifications
Overall Length 260.00 in
Tube OD 5.12 in
Contour Length 243.00 in
Tube ID 4.250 in
Rubber Cut-back
Side 1: 8.50 in
Side 2: 8.50 in
Weight 674 lb
Material Alloy Steel
Performance Specifications
Flow Range 300-425 GPM
Rev per Unit Volume 0.80 Rev/Gal
Speed Range 240-340 RPM
No Load Pressure Loss 184 psi
  POB XTH
Max Rec Press 2,440 psi 2,620 psi
Torque @ Max Press 8,420 ft-lbs 9,020 ft-lbs
Stall Pressure 4,470 psi 4,790 psi
Stall Torque 15,420 ft-lbs 16,520 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
0 2.804 -0.001
2 2.813 -0.010 2.811 -0.008
6 2.821 -0.018 2.821 -0.018
 
Reline Lengths (in) Max 260 Min 254
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 4,000 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 2,000 4,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 2,000 4,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 1,000 2,000 3,000 4,000 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
Speed
300 GPM 363 GPM 425 GPM Differential Pressure (psi) 0 1,000 2,000 3,000 4,000 Speed (RPM) 0 100 200 300 400
Mechanical Power
300 GPM 363 GPM 425 GPM Differential Pressure (psi) 0 1,000 2,000 3,000 4,000 Mechanical Power (hp) 0 200 400 600
©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.