Power Section Specification (Metric)
312-7830
79.3 mm 7:8 Lobes 3.0 Stages
Rotor Specifications
Overall Length 2625.9 mm
Avg. Diameter 44.55 mm
Contour Length 2463.8 mm
Eccentricity 2.76 mm
Major Diameter 50.06 mm
Head Diameter 57.15 mm
Head Length 162.1 mm
Weight 32 kg
Thread Form 0.75-10 UNC
Stator Specifications
Overall Length 2692.4 mm
Tube OD 79.38 mm
Contour Length 2406.7 mm
Tube ID 66.27 mm
Rubber Cut-back
Side 1: 142.9 mm
Side 2: 142.9 mm
Weight 36 kg
Material Alloy Steel
Performance Specifications
Flow Range 303-636 LPM
Rev per Unit Volume 0.46 Rev/L
Speed Range 139-292 RPM
No Load Pressure Loss 1165 kPa
  XTH RTP
Max Rec Press 5,390 kPa 4,900 kPa
Torque @ Max Press 1,600 N-m 1,460 N-m
Stall Pressure 8,090 kPa 7,350 kPa
Stall Torque 2,400 N-m 2,180 N-m
Stator Minors and Fit (mm) at 21°C
  RTP XTH
Group Minor Fit Minor Fit
C 44.30 0.25 44.30 0.25
0 44.75 -0.20 44.75 -0.20
5 45.36 -0.81 45.36 -0.81
7 45.62 -1.07 45.62 -1.07
Reline Lengths (mm) Max 2692 Min 2540 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 2,000 4,000 6,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 5,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 Torque (Nm) 0 500 1,000 1,500 2,000 2,500
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5 2
Speed
303 LPM 469 LPM 636 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 Speed (RPM) 0 100 200 300
Mechanical Power
303 LPM 469 LPM 636 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 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.