ATRA-FLEX M-Series Couplings

Reduce Cost of Maintenance and Downtime

For reliability and total low cost of ownership, customers turn to ATRA-FLEX flexible couplings. We are proud to provide

high-quality couplings that have been proven to increase efficiency and productivity for industrial applications worldwide since 1980.

How it Works

The M-Series close coupled couplings consist of four parts, two flex hubs, insert, and ring. The flex hubs are installed on the shafts with the ring twisted and locked over the flex hub. After coupling alignment, the insert is placed around the flex hubs engaging with the bottom lobes of the insert. The ring is then twisted and locked to engage with the insert. No fasteners or special tooling is required. M-Series uniquely combines the stability of a compression type coupling with the safety of a shear coupling. In the event of a lockup, the insert will shear, minimizing the possibility of damaging your rotational equipment. The rugged polyurethane insert is the only spare part and can be replaced in minutes without having to move the equipment or the shaft hubs.

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Features

  • Unique twist and lock-on ring means no fasteners or special tools required to install the coupling
  • Absorbs extreme torsional shock and vibration while accommodating angular, parallel, and axial misalignment
  • No lubrication or routine maintenance is required
  • Improved design with a larger bore capacity and a higher horsepower rating
  • Withstands a temperature range from -60° to 350° Fahrenheit depending on insert type
  • Wide range of inserts available to meet most torsional stiffness and torque requirements and offers very high resistance to chemical and temperature shifts.
  • Nitrocarburized process is available for corrosion resistance as a cost-effective alternative to stainless steel
  • High torque density allowing for up to 20″ shaft diameters and 3,610,000 in-lbs of torque in several configurations including: spacer, floating shaft, flywheel, axial slide, and limited-end float, among others

Manufacturing Process

M-Series USA-made standard hubs and rings are machined from solid carbon steel rounds and tubing, maintaining tight tolerances which provides excellent coupling balance. Stainless steels in grades 303,304 and 316 are also available for corrosive environments and food applications. We also offer a low-cost alternative to stainless steel that’s called nitrocarburized. This gives our carbon steel a uniform case-hardened exterior layer and significantly preventing corrosion. Inserts are made from durable custom compounded polyurethane that offer resistance to almost every fluid found in industry today.

INSERT YELLOW
M00 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M12 M13
CONTINUOUS (LB-IN) 180 600 1,260 3,000 5,760 12,600 28,800 48,000 111,000 186,600 273,000 420,000 960,000 1,900,000
INTERMITTENT (LB-IN) 300 1,000 2,100 5,000 9,600 21,000 48,000 80,000 185,000 311,000 455,000 700,000 1,600,000 3,200,000
INSERT RED
M00 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M12 M13
CONTINUOUS (LB-IN) 153 510 1,071 2,550 4,896 10,710 24,480 40,800 94,350 158,610 232,050 357,000 816,000 1,615,000
INTERMITTENT (LB-IN) 255 850 1,785 4,250 8,160 17,850 40,800 68,000 157,250 246,350 386,750 595,000 1,136,000 2,720,000
INSERT ORANGE
M00 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M12 M13
CONTINUOUS (LB-IN) 342 1,140 2,394 5,700 10,944 23,940 54,720 91,200 210,900 354,540 518,700 798,000 1,824,000 3,610,000
INTERMITTENT (LB-IN) 570 1,900 3,990 9,500 18,240 39,900 91,200 152,000 351,500 590,900 864,500 1,330,000 3,040,000 6,080,000
INSERT GREEN
M00 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M12 M13
CONTINUOUS (LB-IN) 88 293 614 1,463 2,808 6,143 14,040 23,400 54,113 90,668 133,088 204,750 468,000 962,500
INTERMITTENT (LB-IN) 146 488 1,024 2,438 4,680 10,238 23,400 39,000 90,188 151,613 221,813 341,250 780,000 1,560,000