Power Section Specification (Metric)
500-7837
127 mm 7:8 Lobes 3.7 Stages
Rotor Specifications
Overall Length 5448.3 mm
Avg. Diameter 70.26 mm
Contour Length 5295.9 mm
Eccentricity 4.48 mm
Major Diameter 79.22 mm
Head Diameter 85.85 mm
Head Length 152.4 mm
Weight 157 kg
Thread Form 1 3/8" Stub Acme
Stator Specifications
Overall Length 5867.4 mm
Tube OD 127.00 mm
Contour Length 5372.1 mm
Tube ID 98.42 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 292.1 mm
Weight 251 kg
Material Alloy Steel
Performance Specifications
Flow Range 568-1325 LPM
Rev per Unit Volume 0.09 Rev/L
Speed Range 53-124 RPM
No Load Pressure Loss 986 kPa
  POB XTH
Max Rec Press 6,050 kPa 6,650 kPa
Torque @ Max Press 8,790 N-m 9,670 N-m
Stall Pressure 9,070 kPa 9,980 kPa
Stall Torque 13,180 N-m 14,500 N-m
Stator Minors and Fit (mm) at 21°C
  POB XTH
Group Minor Fit Minor Fit
A 70.18 0.08
0 70.38 -0.13
2 70.64 -0.38 70.64 -0.38
Reline Lengths (mm) Max 5867 Min 5715 Alternate Stator OD (mm): - / -
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 5,000 10,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5 2
Speed
568 LPM 946 LPM 1325 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
Mechanical Power
568 LPM 946 LPM 1325 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.