Power Section Specification
475-91040
4.75" 9:10 Lobes 4.0 Stages
Rotor Specifications
Overall Length 151.12 in
Avg. Diameter 2.671 in
Contour Length 145.12 in
Eccentricity 0.137 in
Major Diameter 2.945 in
Head Diameter 2.900 in
Head Length 6.00 in
Weight 236 lb
Thread Form 2 3/8" HEF
Stator Specifications
Overall Length 159.00 in
Tube OD 4.75 in
Contour Length 143.00 in
Tube ID 3.750 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 8.00 in
Weight 327 lb
Material Alloy Steel
Performance Specifications
Flow Range 100-250 GPM
Rev per Unit Volume 0.54 Rev/Gal
Speed Range 53-134 RPM
No Load Pressure Loss 143 psi
  POB
Max Rec Press 1,010 psi
Torque @ Max Press 4,730 ft-lbs
Stall Pressure 1,520 psi
Stall Torque 7,100 ft-lbs
Stator Minors and Fit (in) at 70°F
  POB
Group Minor Fit
2 2.689 -0.018
Reline Lengths (in) Max 159 Min 153 Alternate Stator OD (in): 5.000 / -
Torque
Differential Pressure (psi) 0 500 1,000 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 500 1,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 1,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Torque (ft-lb) 0 2,000 4,000 6,000
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
Speed
100 GPM 175 GPM 250 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Speed (RPM) 0 50 100 150
Mechanical Power
100 GPM 175 GPM 250 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 1,400 1,600 Mechanical Power (hp) 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.