Power Section Specification
287-7837
2.875" 7:8 Lobes 3.7 Stages
Rotor Specifications
Overall Length 69.00 in
Avg. Diameter 1.597 in
Contour Length 65.00 in
Eccentricity 0.100 in
Major Diameter 1.796 in
Head Diameter 1.500 in
Head Length 4.00 in
Weight 39 lb
Thread Form 1.125-5 SA
Stator Specifications
Overall Length 76.00 in
Tube OD 2.88 in
Contour Length 64.00 in
Tube ID 2.375 in
Rubber Cut-back
Side 1: 6.00 in
Side 2: 6.00 in
Weight 50 lb
Material Alloy Steel
Performance Specifications
Flow Range 60-120 GPM
Rev per Unit Volume 3.39 Rev/Gal
Speed Range 203-407 RPM
No Load Pressure Loss 133 psi
  XTH
Max Rec Press 960 psi
Torque @ Max Press 750 ft-lbs
Stall Pressure 1,450 psi
Stall Torque 1,120 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH
Group Minor Fit
3 1.618 -0.021
7 1.638 -0.041
Reline Lengths (in) Max 76 Min 70 Alternate Stator OD (in): - / -
Torque
Differential Pressure (psi) 0 500 1,000 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 500 1,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 500 1,000 1,500 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Torque (ft-lb) 0 200 400 600 800
Fit Increase
Change in Temperature (°F) 0 50 100 150 200 250 300 350 Fit Increase (in) 0 0.02 0.04 0.06
Speed
60 GPM 90 GPM 120 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Speed (RPM) 0 100 200 300 400 500
Mechanical Power
60 GPM 90 GPM 120 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 1,400 1,600 Mechanical Power (hp) 0 20 40 60
©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.