Power Section Specification (Metric)
475-7838
120.7 mm 7:8 Lobes 3.8 Stages
Rotor Specifications
Overall Length 4521.2 mm
Avg. Diameter 66.23 mm
Contour Length 4368.8 mm
Eccentricity 4.17 mm
Major Diameter 74.57 mm
Head Diameter 69.85 mm
Head Length 152.4 mm
Weight 125 kg
Thread Form 2 3/8" HEF
Stator Specifications
Overall Length 4749.8 mm
Tube OD 120.65 mm
Contour Length 4343.4 mm
Tube ID 95.25 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 203.2 mm
Weight 174 kg
Material Alloy Steel
Performance Specifications
Flow Range 379-1230 LPM
Rev per Unit Volume 0.13 Rev/L
Speed Range 50-164 RPM
No Load Pressure Loss 1082 kPa
  POB XTH PRR
Max Rec Press 6,210 kPa 6,830 kPa 6,210 kPa
Torque @ Max Press 6,340 N-m 6,970 N-m 6,340 N-m
Stall Pressure 9,310 kPa 10,250 kPa 9,310 kPa
Stall Torque 9,510 N-m 10,460 N-m 9,510 N-m
Stator Minors and Fit (mm) at 21°C
  PRR POB XTH
Group Minor Fit Minor Fit Minor Fit
0 66.34 -0.11 66.29 -0.06
4 67.01 -0.78 66.93 -0.70 66.83 -0.60
5 67.08 -0.85 67.01 -0.78
7 67.23 -1.00 67.31 -1.08
Reline Lengths (mm) Max 4750 Min 4597 Alternate Stator OD (mm): 127.0 / -
Torque
Differential Pressure (kPa) 0 5,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 100 200 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 5,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 5,000 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 Torque (Nm) 0 2,000 4,000 6,000 8,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5 2
Speed
379 LPM 804 LPM 1230 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 Speed (RPM) 0 50 100 150 200
Mechanical Power
379 LPM 804 LPM 1230 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Mechanical Power (Kw) 0 50 100
©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.