Power Section Specification (Metric)
412-7850
104.8 mm 7:8 Lobes 5.0 Stages
Rotor Specifications
Overall Length 3784.6 mm
Avg. Diameter 58.06 mm
Contour Length 3606.8 mm
Eccentricity 3.66 mm
Major Diameter 65.38 mm
Head Diameter 57.15 mm
Head Length 177.8 mm
Weight 79 kg
Thread Form 1.625-5 NOIHT
Stator Specifications
Overall Length 3987.8 mm
Tube OD 104.77 mm
Contour Length 3581.4 mm
Tube ID 85.72 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 203.2 mm
Weight 99 kg
Material Alloy Steel
Performance Specifications
Flow Range 360-719 LPM
Rev per Unit Volume 0.26 Rev/L
Speed Range 94-189 RPM
No Load Pressure Loss 703 kPa
  POB PRR
Max Rec Press 8,170 kPa 8,170 kPa
Torque @ Max Press 4,240 N-m 4,240 N-m
Stall Pressure 12,260 kPa 12,260 kPa
Stall Torque 6,360 N-m 6,360 N-m
Stator Minors and Fit (mm) at 21°C
  PRR POB
Group Minor Fit Minor Fit
4 58.75 -0.69 58.72 -0.66
Reline Lengths (mm) Max 3988 Min 3835 Alternate Stator OD (mm): - / -
Torque
Differential Pressure (kPa) 0 5,000 10,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 100 200 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 5,000 10,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Torque (Nm) 0 2,000 4,000 6,000
Fit Increase
Change in Temperature (°C) 0 50 100 150 200 Fit Increase (mm) 0 0.5 1 1.5 2
Speed
360 LPM 539 LPM 719 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Speed (RPM) 0 50 100 150 200 250
Mechanical Power
360 LPM 539 LPM 719 LPM Differential Pressure (kPa) 0 5,000 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.