Power Section Specification (Metric)
512-91061
130.18 mm 9:10 Lobes 6.1 Stages
Rotor Specifications
Overall Length 6184.9 mm
Avg. Diameter 73.70 mm
Contour Length 5994.4 mm
Eccentricity 3.74 mm
Major Diameter 81.18 mm
Head Diameter 78.74 mm
Head Length 190.5 mm
Weight 205 kg
Thread Form 1.3/8" - 6 SA
Stator Specifications
Overall Length 6375.4 mm
Tube OD 130.17 mm
Contour Length 5943.6 mm
Tube ID 101.60 mm
Rubber Cut-back
Side 1: 215.9 mm
Side 2: 215.9 mm
Weight 281 kg
Material Alloy Steel
Performance Specifications
Flow Range 379-1325 LPM
Rev per Unit Volume 0.12 Rev/L
Speed Range 45-159 RPM
No Load Pressure Loss 1000 kPa
  POB
Max Rec Press 10,660 kPa
Torque @ Max Press 11,520 N-m
Stall Pressure 15,990 kPa
Stall Torque 17,280 N-m
Stator Minors and Fit (mm) at 21°C
  POB
Group Minor Fit
A 73.69 0.01
1 74.04 -0.34
Reline Lengths (mm) Max 6375 Min 6223 Alternate Stator OD (mm): - / -
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
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5 2
Speed
379 LPM 852 LPM 1325 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
379 LPM 852 LPM 1325 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 Mechanical Power (Kw) 0 50 100 150 200
©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.