Power Section Specification (Metric)
650-7850
166.751 mm 7:8 Lobes 5.0 Stages
Rotor Specifications
Overall Length 4775.2 mm
Avg. Diameter 101.94 mm
Contour Length 4597.4 mm
Eccentricity 6.39 mm
Major Diameter 114.73 mm
Head Diameter 101.60 mm
Head Length 177.8 mm
Weight 296 kg
Thread Form 2 3/8" API Reg
Stator Specifications
Overall Length 4927.6 mm
Tube OD 166.75 mm
Contour Length 4559.3 mm
Tube ID 139.70 mm
Rubber Cut-back
Side 1: 184.1 mm
Side 2: 184.1 mm
Weight 279 kg
Material Alloy Steel
Performance Specifications
Flow Range 1136-2271 LPM
Rev per Unit Volume 0.07 Rev/L
Speed Range 84-168 RPM
No Load Pressure Loss 979 kPa
  POB XTH
Max Rec Press 8,170 kPa 8,990 kPa
Torque @ Max Press 15,120 N-m 16,630 N-m
Stall Pressure 12,260 kPa 13,480 kPa
Stall Torque 22,680 N-m 24,940 N-m
Stator Minors and Fit (mm) at 21°C
  POB XTH
Group Minor Fit Minor Fit
T 101.35 0.60
0 101.63 0.32 101.63 0.32
2 102.21 -0.27
4 102.41 -0.47 102.41 -0.47
7 103.10 -1.16
Reline Lengths (mm) Max 4928 Min 4775 Alternate Stator OD (mm): 171.4 / 177.8
Torque
Differential Pressure (kPa) 0 10,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 100 200 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 5,000 10,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 5,000 10,000 Torque (Nm) 0 5,000 10,000 15,000 20,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 1 2 3
Speed
1136 LPM 1703 LPM 2271 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 12,000 Speed (RPM) 0 50 100 150 200
Mechanical Power
1136 LPM 1703 LPM 2271 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 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.