Power Section Specification (Metric)
287-7837
73 mm 7:8 Lobes 3.7 Stages
Rotor Specifications
Overall Length 1752.6 mm
Avg. Diameter 40.56 mm
Contour Length 1651.0 mm
Eccentricity 2.53 mm
Major Diameter 45.62 mm
Head Diameter 38.10 mm
Head Length 101.6 mm
Weight 18 kg
Thread Form 1.125-5 SA
Stator Specifications
Overall Length 1930.4 mm
Tube OD 73.02 mm
Contour Length 1625.6 mm
Tube ID 60.32 mm
Rubber Cut-back
Side 1: 152.4 mm
Side 2: 152.4 mm
Weight 23 kg
Material Alloy Steel
Performance Specifications
Flow Range 227-454 LPM
Rev per Unit Volume 0.90 Rev/L
Speed Range 203-407 RPM
No Load Pressure Loss 917 kPa
  XTH
Max Rec Press 6,650 kPa
Torque @ Max Press 1,020 N-m
Stall Pressure 9,980 kPa
Stall Torque 1,520 N-m
Stator Minors and Fit (mm) at 21°C
  XTH
Group Minor Fit
3 41.10 -0.53
7 41.61 -1.04
Reline Lengths (mm) Max 1930 Min 1778 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) 0 500 1,000 1,500 2,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5
Speed
227 LPM 341 LPM 454 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 Speed (RPM) 0 100 200 300 400 500
Mechanical Power
227 LPM 341 LPM 454 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Mechanical Power (Kw) 0 10 20 30 40
©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.