Power Section Specification
500-7837
5" 7:8 Lobes 3.7 Stages
Rotor Specifications
Overall Length 214.50 in
Avg. Diameter 2.766 in
Contour Length 208.50 in
Eccentricity 0.177 in
Major Diameter 3.119 in
Head Diameter 3.380 in
Head Length 6.00 in
Weight 347 lb
Thread Form 1 3/8" Stub Acme
Stator Specifications
Overall Length 231.00 in
Tube OD 5.00 in
Contour Length 211.50 in
Tube ID 3.875 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 11.50 in
Weight 554 lb
Material Alloy Steel
Performance Specifications
Flow Range 150-350 GPM
Rev per Unit Volume 0.36 Rev/Gal
Speed Range 53-124 RPM
No Load Pressure Loss 143 psi
  POB XTH
Max Rec Press 880 psi 960 psi
Torque @ Max Press 6,480 ft-lbs 7,130 ft-lbs
Stall Pressure 1,320 psi 1,450 psi
Stall Torque 9,720 ft-lbs 10,690 ft-lbs
Stator Minors and Fit (in) at 70°F
  POB XTH
Group Minor Fit Minor Fit
A 2.763 0.003
0 2.771 -0.005
2 2.781 -0.015 2.781 -0.015
Reline Lengths (in) Max 231 Min 225 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 1,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Torque (ft-lb) 0 2,000 4,000 6,000 8,000
Fit Increase
Change in Temperature (°F) 0 50 100 150 200 250 300 350 Fit Increase (in) 0 0.02 0.04 0.06 0.08
Speed
150 GPM 250 GPM 350 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Speed (RPM) 0 50 100
Mechanical Power
150 GPM 250 GPM 350 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 1,400 1,600 Mechanical Power (hp) 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.