Power Section Specification (Metric)
338-7825
85.78 mm 7:8 Lobes 2.5 Stages
Rotor Specifications
Overall Length 2438.4 mm
Avg. Diameter 47.65 mm
Contour Length 2235.2 mm
Eccentricity 3.10 mm
Major Diameter 53.85 mm
Head Diameter 57.15 mm
Head Length 203.2 mm
Weight 35 kg
Thread Form 0.75-10 UNC
Stator Specifications
Overall Length 2537.0 mm
Tube OD 85.72 mm
Contour Length 2181.4 mm
Tube ID 66.67 mm
Rubber Cut-back
Side 1: 177.8 mm
Side 2: 177.8 mm
Weight 49 kg
Material Alloy Steel
Performance Specifications
Flow Range 303-795 LPM
Rev per Unit Volume 0.32 Rev/L
Speed Range 98-258 RPM
No Load Pressure Loss 1096 kPa
  XTH RTP
Max Rec Press 4,490 kPa 4,080 kPa
Torque @ Max Press 1,900 N-m 1,720 N-m
Stall Pressure 6,740 kPa 6,130 kPa
Stall Torque 2,840 N-m 2,580 N-m
Stator Minors and Fit (mm) at 21°C
  RTP XTH
Group Minor Fit Minor Fit
0 47.75 -0.10 47.75 -0.10
4 48.08 -0.43 48.08 -0.43
Reline Lengths (mm) Max 2537 Min 2385 Alternate Stator OD (mm): - / -
Torque
Differential Pressure (kPa) 0 2,000 4,000 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 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 2,000 4,000 6,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 Torque (Nm) 0 1,000 2,000 3,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1
Speed
303 LPM 549 LPM 795 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 Speed (RPM) 0 100 200 300
Mechanical Power
303 LPM 549 LPM 795 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 Mechanical Power (Kw) 0 10 20 30 40 50
©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.