Power Section Specification (Metric)
287-4540
73 mm 4:5 Lobes 4.0 Stages
Rotor Specifications
Overall Length 2589.0 mm
Avg. Diameter 38.89 mm
Contour Length 2487.4 mm
Eccentricity 3.96 mm
Major Diameter 46.81 mm
Head Diameter 42.93 mm
Head Length 101.6 mm
Weight 34 kg
Thread Form 1.150-8 SPEC ACME HT
Stator Specifications
Overall Length 2683.0 mm
Tube OD 73.02 mm
Contour Length 2479.8 mm
Tube ID 60.32 mm
Rubber Cut-back
Side 1: 101.6 mm
Side 2: 101.6 mm
Weight 31 kg
Material Alloy Steel
Performance Specifications
Flow Range 265-795 LPM
Rev per Unit Volume 0.76 Rev/L
Speed Range 202-606 RPM
No Load Pressure Loss 910 kPa
  XTH RTP
Max Rec Press 6,440 kPa 5,850 kPa
Torque @ Max Press 1,240 N-m 1,120 N-m
Stall Pressure 9,660 kPa 8,780 kPa
Stall Torque 1,860 N-m 1,690 N-m
Stator Minors and Fit (mm) at 21°C
  RTP XTH
Group Minor Fit Minor Fit
0 38.94 -0.05
2 39.09 -0.20
5 39.47 -0.58 39.47 -0.58
Reline Lengths (mm) Max 2683 Min 2531 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
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5
Speed
265 LPM 530 LPM 795 LPM Differential Pressure (kPa) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 Speed (RPM) 0 200 400 600 800
Mechanical Power
265 LPM 530 LPM 795 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.