ERT™ Power Section Specification
500ERT6764
5" 6:7 Lobes 6.4 Stages
Rotor Specifications
Overall Length 176.50 in
Avg. Diameter 2.662 in
Contour Length 170.50 in
Eccentricity 0.206 in
Major Diameter 3.073 in
Head Diameter 3.415 in
Head Length 6.00 in
Weight 279 lb
Thread Form NC23 API
Stator Specifications
Overall Length 200.00 in
Tube OD 5.00 in
Contour Length 168.00 in
Tube ID 3.176 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 24.00 in
Weight 406 lb
Material Alloy Steel
Performance Specifications
Flow Range 150-300 GPM
Rev per Unit Volume 0.79 Rev/Gal
Speed Range 118-236 RPM
No Load Pressure Loss 149 psi
  POB XTH
Max Rec Press 1,710 psi 1,830 psi
Torque @ Max Press 5,850 ft-lbs 6,260 ft-lbs
Stall Pressure 3,130 psi 3,350 psi
Stall Torque 10,700 ft-lbs 11,460 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
1 2.668 -0.006 2.668 -0.006
2 2.671 -0.009 2.671 -0.009
3 2.676 -0.014 2.676 -0.014
 
Reline Lengths (in) Max 200 Min 194
Alt. Stator OD (in)   -   -
Alt. Rotor Diameter (in) - 2.657 - -

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

Torque
Differential Pressure (psi) 0 1,000 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 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 1,000 2,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 Torque (ft-lb) 0 2,000 4,000 6,000 8,000
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
150 GPM 225 GPM 300 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 Speed (RPM) 0 100 200 300
Mechanical Power
150 GPM 225 GPM 300 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 Mechanical Power (hp) 0 100 200 300 400
©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.