HercuFlex® Rigid Adjustable Couplings (RA & RAHS)

The RA and RAHS couplings are offered in two different styles. Type II coupling consists of two rigid hubs, adjusting nut and split ring and split ring for motor bub. Type IV coupling consists of two rigid hubs, adjusting nut, split ring for motor hub and spacer.

  • Axial positioning of the pump impeller in vertical pump applications
  • Clearance fit bores allows for easy installation and maintenance for pump and/or motor
  • Easily adjustable for vertical clearance
  • Removable spacer for easy maintenance
  • AISI 1045 Steel (Stainless Steel coupling also available)
HercuFlex™ Rigid Adjustable Couplings (RA & RAHS)

Resources

HercuFlex Couplings Catalog (Rev F) (pdf)

HercuFlex Gear Coupling Design Whitepaper (pdf)

Installation Instructions & Videos

HercuFlex® Rigid Adjustable Couplings (RA & RAHS) Additional Resources

Note: Performance Data below is for Standard RA & RAHS Series only. Please download catalog for dimensional data, and for performance data on other HercuFlex type gear couplings.

Size HP/100
RPM		 Nominal
Torque
(in-lbs)		 Thrust
Capacity
(lbs)		 Min
Bore
(in)		 Min
Bore
(mm)		 Max
Bore
(in)		 Max
Bore
(mm)
1125 2.7 1,702 4,500 0.44 11 1.125 29
1625 8.0 5,042 11,000 0.63 16 1.625 42
2125 17.9 11,282 31,000 0.73 18 2.125 56
2625 33.8 21,302 31,000 0.88 22 2.625 70
2875 44.4 27,983 31,000 0.88 22 2.875 77
3125 57.0 35,924 41,000 1.19 30 3.125 84
3875 109.0 68,697 73,000 1.25 31 3.875 103
5000 310.0 195,378 160,000 2.38 60 5.000 135
6000 404.0 254,621 300,000 2.88 73 6.000 167
7250 712.0 448,738 300,000 4.00 101 7.250 194
8500 1148.0 723,527 350,000 4.00 101 8.500 225
10500 2164.0 1,363,861 400,000 5.00 127 10.500 276