Power Section Specification (Metric)
312-5635
79.3 mm 5:6 Lobes 3.5 Stages
Rotor Specifications
Overall Length 2133.6 mm
Avg. Diameter 47.45 mm
Contour Length 2057.4 mm
Eccentricity 3.96 mm
Major Diameter 55.37 mm
Head Diameter 57.15 mm
Head Length 76.2 mm
Weight 28 kg
Thread Form -
Stator Specifications
Overall Length 2235.2 mm
Tube OD 79.38 mm
Contour Length 2032.0 mm
Tube ID 66.67 mm
Rubber Cut-back
Side 1: 101.6 mm
Side 2: 101.6 mm
Weight 29 kg
Material Alloy Steel
Performance Specifications
Flow Range 379-871 LPM
Rev per Unit Volume 0.57 Rev/L
Speed Range 215-494 RPM
No Load Pressure Loss 931 kPa
  XTH RTP
Max Rec Press 5,850 kPa 5,320 kPa
Torque @ Max Press 1,480 N-m 1,340 N-m
Stall Pressure 8,780 kPa 7,980 kPa
Stall Torque 2,210 N-m 2,010 N-m
Stator Minors and Fit (mm) at 21°C
  RTP XTH
Group Minor Fit Minor Fit
0 47.68 -0.23 47.68 -0.23
3 48.03 -0.58 48.03 -0.58
6 48.31 -0.86 48.31 -0.86
Reline Lengths (mm) Max 2235 Min 2083 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 5,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 5,000 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 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
Speed
379 LPM 625 LPM 871 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 Speed (RPM) 0 100 200 300 400 500
Mechanical Power
379 LPM 625 LPM 871 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Mechanical Power (Kw) 0 20 40 60 80
©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.