Power Section Specification
512-91061
5.125" 9:10 Lobes 6.1 Stages
Rotor Specifications
Overall Length 243.50 in
Avg. Diameter 2.902 in
Contour Length 236.00 in
Eccentricity 0.147 in
Major Diameter 3.196 in
Head Diameter 3.100 in
Head Length 7.50 in
Weight 451 lb
Thread Form 1.3/8" - 6 SA
Stator Specifications
Overall Length 251.00 in
Tube OD 5.12 in
Contour Length 234.00 in
Tube ID 4.000 in
Rubber Cut-back
Side 1: 8.50 in
Side 2: 8.50 in
Weight 620 lb
Material Alloy Steel
Performance Specifications
Flow Range 100-350 GPM
Rev per Unit Volume 0.46 Rev/Gal
Speed Range 45-159 RPM
No Load Pressure Loss 145 psi
  POB
Max Rec Press 1,550 psi
Torque @ Max Press 8,500 ft-lbs
Stall Pressure 2,320 psi
Stall Torque 12,750 ft-lbs
Stator Minors and Fit (in) at 70°F
  POB
Group Minor Fit
A 2.901 0.001
1 2.915 -0.013
Reline Lengths (in) Max 251 Min 245 Alternate Stator OD (in): - / -
Torque
Differential Pressure (psi) 0 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 1,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 1,000 2,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 500 1,000 1,500 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
Speed
100 GPM 225 GPM 350 GPM Differential Pressure (psi) 0 500 1,000 1,500 Speed (RPM) 0 50 100 150 200
Mechanical Power
100 GPM 225 GPM 350 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 Mechanical Power (hp) 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.