M Series 60-120 hp

The M Series packs big compressor performance into a small, low horsepower design.
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Design Philosophy

Built to run continuously at speeds up to 1800 RPM, these 3.0 inch stroke machines are available in one and two throw models with double acting and or stepped cylinder configurations.

Available in the following models:

  • M 301 - 1 Throw Frame
  • M 302 - 2 Throw Frame

M Series™ Frame Specifications
  M 301 M 302
Rated Speed-Max. (RPM) 1800 1800
Max HP/kW 60/44 120/88
Number of Throws 1 2
Max. Number of Stages 2 4
Rod Load - Tension (lb/kg) 6000/2721 6000/2721
Rod Load Compression (lb/kg) 6000/2721 6000/2721
Combined Rod Load (lb/kg) 12,000/5442 12,000/5442
Stroke (in/mm) 3.0/76.2 3.0/76.2
Piston Rod Diameter (in/mm) 1.125/28.5 1.125/28.5
Crankshaft Material 1050 F.S. 1050 F.S.
Connecting Rod Material F.S. F.S.
Crankpin & Main Bearing Dia. (in/mm) 3.0/76.2 3.0/76.2
Crankpin & Main Bearings - width (in/mm) 1.38/35.0 1.38/35.0
Main Bearing - Dia. (in/mm) 3.0/76.2 3.0/76.2
Main Bearing - width (in/mm) 1.88/47.7 1.88/47.7
Connecting Rod Pin Bushing - Dia. (in/mm) 1.38/35.0 1.38/35.0
Connecting Rod Pin Bushing - Length (in/mm) 1.25/31.75 1.25/31.75
Unit Length (in/mm) 24/610 24/610
Unit Width (in/mm) 62/1595 78/1981
Unit Weight with cylinders (lb/kg) 1500/680 1870/848
Specifications noted here may vary depending upon unitconfiguration.

M Series Cylinder Combinations
Operation Material Bore (in) MAWP (psig) Liner Cooling
Double Acting C.I. 2.5, 3.0 1440 No Air
Double Acting C.I. 2.5, 3.0 1250 No Air
Double Acting C.I. 3.5, 4.0 1250 No Air
Double Acting C.I. 4.5, 5.0 1250 No Air
Double Acting C.I. 5.5 1000 No Air
Double Acting C.I. 6.5, 7.5 500 No Air
Double Acting C.I. 8.0, 9.0 300 No Air
Double Acting C.I. 10 300 No Air
SAHE StepF.S. 1.25, 1.5 6000 Yes Air
SAHE Step D.I. 1.25, 1.5 4500 Yes Air
SACE Step F.S. 2.5, 3.0 3500 No Air
SACE Step D.I. 2.5, 3.0 2500 No Air
SACE Step C.I. 2.5, 3.0 1250 No Air
SAHE Step C.I. 2.5, 3.0 1250 No Air
SAHE Step C.I. 4 1250 No Air
SACE Step C.I. 3.5, 4.0 1250 No Air
SAHE Step C.I. 5 1250 No Air
SACE Step C.I. 5 1250 No Air
SAHE Step C.I. 5.5 750 No Air
SAHE Step C.I. 6 700 No Air
SAHE Step C.I. 6.5 500 No Air
SAHE Step C.I. 7.5 500 No Air
SAHE Step C.I. 8 300 No Air
SAHE C.I. 2.0, 2.5 1250 No Air
SAHE C.I. 3.5, 4.0, 4.37 500 Yes Air
SAHE C.I. 5.5 250 No Air
SAHE C.I. 7 150 No Air
D.I. = Ductile Iron C.I. = Cast Iron F.S. = ForgedSteel.

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