Power Section Specification (Metric)
500-7826 (R)
127 mm 7:8 Lobes 2.6 Stages
Rotor Specifications
Overall Length 5588.0 mm
Avg. Diameter 69.80 mm
Contour Length 5435.6 mm
Eccentricity 4.43 mm
Major Diameter 78.66 mm
Head Diameter 69.85 mm
Head Length 152.4 mm
Weight 168 kg
Thread Form 2.3/8" HEF
Stator Specifications
Overall Length 5822.9 mm
Tube OD 127.00 mm
Contour Length 5416.6 mm
Tube ID 101.60 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 203.2 mm
Weight 228 kg
Material Alloy Steel
Performance Specifications
Flow Range 379-1136 LPM
Rev per Unit Volume 0.07 Rev/L
Speed Range 25-75 RPM
No Load Pressure Loss 772 kPa
  POB
Max Rec Press 4,250 kPa
Torque @ Max Press 8,710 N-m
Stall Pressure 6,370 kPa
Stall Torque 13,060 N-m
Stator Minors and Fit (mm) at 21°C
  POB
Group Minor Fit
0 69.85 -0.05
3 70.26 -0.46
Reline Lengths (mm) Max 5823 Min 5671 Alternate Stator OD (mm): 120.6 / -
Torque
Differential Pressure (kPa) 0 2,000 4,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 100 200 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 2,000 4,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 2,000 4,000 6,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 Torque (Nm) 0 2,000 4,000 6,000 8,000 10,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5 2
Speed
379 LPM 757 LPM 1136 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 Speed (RPM) 0 20 40 60 80
Mechanical Power
379 LPM 757 LPM 1136 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 Mechanical Power (Kw) 0 20 40 60 80
©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.