Power Section Specification
800-7840
8" 7:8 Lobes 4.0 Stages
Rotor Specifications
Overall Length 196.50 in
Avg. Diameter 4.609 in
Contour Length 189.50 in
Eccentricity 0.288 in
Major Diameter 5.186 in
Head Diameter 4.750 in
Head Length 7.00 in
Weight 937 lb
Thread Form 3 1/2" API IF / Reg
Stator Specifications
Overall Length 206.00 in
Tube OD 8.00 in
Contour Length 190.00 in
Tube ID 6.250 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 8.00 in
Weight 1218 lb
Material Alloy Steel
Performance Specifications
Flow Range 300-1000 GPM
Rev per Unit Volume 0.16 Rev/Gal
Speed Range 48-160 RPM
No Load Pressure Loss 164 psi
  POB XTH PRR
Max Rec Press 950 psi 1,040 psi 950 psi
Torque @ Max Press 15,610 ft-lbs 17,170 ft-lbs 15,610 ft-lbs
Stall Pressure 1,420 psi 1,560 psi 1,420 psi
Stall Torque 23,420 ft-lbs 25,760 ft-lbs 23,420 ft-lbs
Stator Minors and Fit (in) at 70°F
  PRR POB XTH
Group Minor Fit Minor Fit Minor Fit
0 4.582 0.027 4.582 0.027 4.582 0.027
1 4.601 0.008 4.601 0.008
2 4.613 -0.004 4.610 -0.001 4.610 -0.001
4 4.633 -0.024 4.634 -0.025 4.634 -0.025
Reline Lengths (in) Max 206 Min 200 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 5,000 10,000 15,000 20,000
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 0.1
Speed
300 GPM 650 GPM 1000 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Speed (RPM) 0 50 100 150 200
Mechanical Power
300 GPM 650 GPM 1000 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 1,400 1,600 Mechanical Power (hp) 0 200 400 600
©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.