Power Section Specification
500-6780
5" 6:7 Lobes 8.0 Stages
Rotor Specifications
Overall Length 239.00 in
Avg. Diameter 2.635 in
Contour Length 233.00 in
Eccentricity 0.192 in
Major Diameter 3.018 in
Head Diameter 2.900 in
Head Length 6.00 in
Weight 374 lb
Thread Form 2 3/8" HEF
Stator Specifications
Overall Length 251.00 in
Tube OD 5.00 in
Contour Length 236.00 in
Tube ID 4.000 in
Rubber Cut-back
Side 1: 7.00 in
Side 2: 7.00 in
Weight 546 lb
Material Alloy Steel
Performance Specifications
Flow Range 150-350 GPM
Rev per Unit Volume 0.81 Rev/Gal
Speed Range 120-282 RPM
No Load Pressure Loss 135 psi
  POB XTH PRR
Max Rec Press 1,830 psi 2,010 psi 1,830 psi
Torque @ Max Press 6,120 ft-lbs 6,740 ft-lbs 6,120 ft-lbs
Stall Pressure 2,740 psi 3,020 psi 2,740 psi
Stall Torque 9,180 ft-lbs 10,100 ft-lbs 9,180 ft-lbs
Stator Minors and Fit (in) at 70°F
  PRR POB XTH
Group Minor Fit Minor Fit Minor Fit
T 2.631 0.004 2.631 0.004 2.631 0.004
0 2.645 -0.010 2.645 -0.010 2.645 -0.010
4 2.658 -0.023 2.658 -0.023 2.658 -0.023
6 2.673 -0.038 2.670 -0.035 2.670 -0.035
Reline Lengths (in) Max 251 Min 245 Alternate Stator OD (in): 4.750 / -
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 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 50 100 150 200 250 300 350 Fit Increase (in) 0 0.02 0.04 0.06 0.08 0.1
Speed
150 GPM 250 GPM 350 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 Speed (RPM) 0 100 200 300
Mechanical Power
150 GPM 250 GPM 350 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 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.