Power Section Specification (Metric)
475-91040
120.7 mm 9:10 Lobes 4.0 Stages
Rotor Specifications
Overall Length 3838.6 mm
Avg. Diameter 67.84 mm
Contour Length 3686.2 mm
Eccentricity 3.48 mm
Major Diameter 74.80 mm
Head Diameter 73.66 mm
Head Length 152.4 mm
Weight 107 kg
Thread Form 2 3/8" HEF
Stator Specifications
Overall Length 4038.6 mm
Tube OD 120.65 mm
Contour Length 3632.2 mm
Tube ID 95.25 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 203.2 mm
Weight 148 kg
Material Alloy Steel
Performance Specifications
Flow Range 379-946 LPM
Rev per Unit Volume 0.14 Rev/L
Speed Range 53-134 RPM
No Load Pressure Loss 986 kPa
  POB
Max Rec Press 6,990 kPa
Torque @ Max Press 6,420 N-m
Stall Pressure 10,490 kPa
Stall Torque 9,620 N-m
Stator Minors and Fit (mm) at 21°C
  POB
Group Minor Fit
2 68.30 -0.46
Reline Lengths (mm) Max 4039 Min 3886 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 662 LPM 946 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
Mechanical Power
379 LPM 662 LPM 946 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.