Power Section Specification
312-7830
3.125" 7:8 Lobes 3.0 Stages
Rotor Specifications
Overall Length 103.38 in
Avg. Diameter 1.754 in
Contour Length 97.00 in
Eccentricity 0.109 in
Major Diameter 1.971 in
Head Diameter 2.250 in
Head Length 6.38 in
Weight 71 lb
Thread Form 0.75-10 UNC
Stator Specifications
Overall Length 106.00 in
Tube OD 3.12 in
Contour Length 94.75 in
Tube ID 2.609 in
Rubber Cut-back
Side 1: 5.62 in
Side 2: 5.62 in
Weight 79 lb
Material Alloy Steel
Performance Specifications
Flow Range 80-168 GPM
Rev per Unit Volume 1.74 Rev/Gal
Speed Range 139-292 RPM
No Load Pressure Loss 169 psi
  XTH RTP
Max Rec Press 780 psi 710 psi
Torque @ Max Press 1,180 ft-lbs 1,070 ft-lbs
Stall Pressure 1,170 psi 1,070 psi
Stall Torque 1,770 ft-lbs 1,610 ft-lbs
Stator Minors and Fit (in) at 70°F
  RTP XTH
Group Minor Fit Minor Fit
C 1.744 0.010 1.744 0.010
0 1.762 -0.008 1.762 -0.008
5 1.786 -0.032 1.786 -0.032
7 1.796 -0.042 1.796 -0.042
Reline Lengths (in) Max 106 Min 100 Alternate Stator OD (in): - / -
Torque
Differential Pressure (psi) 0 500 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 500 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 500 1,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 200 400 600 800 Torque (ft-lb) 0 500 1,000 1,500 2,000
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
80 GPM 124 GPM 168 GPM Differential Pressure (psi) 0 100 200 300 400 500 600 700 800 900 Speed (RPM) 0 100 200 300
Mechanical Power
80 GPM 124 GPM 168 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 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.