Regal Rexnord
Flange Couplings
Regal Rexnord flange couplings are precision - machined, rigid bolted connections that join two shafts end - to - end to create a single, continuous shaft line — the definitive solution when the application demands zero relative motion between connected shafts and the machinery can be aligned to near - perfect concentricity.Unlike flexible couplings that accommodate misalignment through compliance, flange couplings rely on precision - fit pilot diameters and tensioned bolted joints to maintain exact shaft alignment under full torque and all operating conditions.Plant engineers, marine propulsion designers, and large - drive OEMs specify Regal Rexnord flange couplings when connecting the output shaft of a gearbox to a pinion stand, mating a generator rotor to a turbine shaft, or joining long line - shafting sections in marine propulsion and hydroelectric turbine drives.Manufactured from forged alloy steel with full traceability, our flange couplings are available in standard designs per AGMA, API, and classification society standards, as well as custom configurations with integral brake discs, shear - pin overload protection, and spacer sections for field serviceability.With torque capacities to over 10,000,000 Nm — matching the output of the world’s largest drives — Regal Rexnord flange couplings provide the ultimate rigidity and reliability for shaft - line integrity in the most critical rotating machinery.
Send an Enquiry
We'll get back to you on WhatsApp.
Trusted by Industry Leaders
Zero - Backlash, 100 % Torque Transmission
Rigid bolted connection with precision pilot diameters eliminates torsional wind - up and lost motion, ensuring that the connected shafts rotate as a single mechanical unit.
Forged Alloy Steel Construction
High - strength, ultrasonically tested forgings per ASTM and classification - society standards provide the material integrity for multi - megawatt torque transmission with safety factors for transient overloads.
Precision - Machined Pilot Fits
Pilot diameters machined to H7 / g6 or tighter tolerances ensure near - perfect shaft concentricity upon assembly, eliminating the residual misalignment that induces vibration and bearing loads.
Custom Flange Configurations
Bolt - hole patterns, pilot diameters, and overall lengths machined to match the specific shaft - end details of the connected machines — no adapter plates, no field modifications.
Integral Brake Disc & Shear - Pin Options
Flange couplings incorporating integral brake discs for holding or emergency stopping, and shear - pin sections for mechanical torque - overload protection of downstream equipment.
Full Material & Process Traceability
Forged materials sourced from certified mills with Charpy impact testing, UT, and chemistry verification; manufacturing documentation packages supporting nuclear, naval, and classification - society certification requirements.
Flange Couplings in Marine Propulsion Line Shafting
In marine propulsion, the main propulsion shaft line connecting the engine(or reduction gear) to the propeller often spans tens of meters and is assembled from multiple sections coupled with rigid flange joints.These couplings must transmit the full engine torque with zero slippage, maintain the precise shaft alignment that minimizes bearing wear and stern - tube leakage, and survive the cyclic bending loads imposed by hull flexure in heavy seas.Regal Rexnord flange couplings for marine service are manufactured to the requirements of ABS, DNV, Lloyd’s, and other major classification societies, with certified material properties, specified bolt tensioning procedures, and documented fatigue - life calculations.For installations where shaft removal for propeller or stern - tube service is anticipated, our marine flange couplings incorporate piloted flange faces that ensure exact re - alignment upon re - assembly, eliminating the need for complex in -situ shaft alignment after each decoupling event.In naval vessels — surface combatants, submarines, and auxiliary ships — our flange couplings are manufactured to military shock - testing and quiet - operation standards that define the pinnacle of coupling engineering.
Rigid Flange vs.Flexible Coupling: When Rigid Is the Right Choice
Rigid flange couplings are the correct choice when the driver and driven equipment can be aligned with high precision and will maintain that alignment throughout all operating conditions — thermal expansion, foundation settling, and pressure / vacuum casing deflections included.Applications characterized by large, stiff machinery on common foundations(large motor - gearbox - pinion drive trains), vertical - shaft machines where gravity assists alignment(vertical hydro - generators and pumps), and close - coupled machines with precision - machined housing pilots(gas - turbine - generator sets) are ideal for rigid couplings.The benefit is maximum drivetrain stiffness, zero coupling wear components to maintain or replace, and the lowest possible coupling - related contribution to system vibration.Flexible couplings are required wherever alignment cannot be guaranteed to remain within very tight bounds — machines on separate foundations subject to differential settling, equipment subject to significant thermal growth, or installations where the coupling must also provide torsional vibration damping or misalignment accommodation.Regal Rexnord application engineers evaluate each installation against these criteria to recommend the optimal coupling rigidity class, ensuring reliable operation without over - engineering costs.