| Coupling | Power Rating | Pilot Drill Size | Max. Bore D | ØA | Length thru' Bore L1 | ØB | Gap G | ØE | DBSE | Overall Length TL1 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Size | Synthetic Rubber | Polyurethane | H-Trans | SW/ RRS | L | |||||||||||
| Rated Torque (Nm) | kW@ 100 rpm | Rated Torque (Nm) | kW@ 100 rpm | Rated Torque (Nm) | kW@ 100 rpm | ||||||||||||
| 225 | 265 | 2.8 | 397.5 | 4.2 | 662.5 | 6.9 | - | 65 | 142 | 127 | 64 | 111 | 3 | 45 | 180 | 153 | |
The L 225 Jaw Coupling (often designated as L225) is a heavy-duty industrial coupling engineered for high-torque power transmission. At this size, the hubs move away from sintered iron and are typically manufactured from high-strength Cast Iron. It is designed to bridge the gap between medium-duty industrial drives and large-scale plant machinery, providing a massive interface for shafts up to 65 mm (or 2-5/8") while maintaining a fail-safe mechanical connection
The L 225 is built for high-demand performance. Its ratings depend on the elastomeric spider material used:
| Specification | Synthetic Rubber (NBR) | Polyurethane (PU) | H-Trans / Hytrel |
| Rated Torque (Nm) | 265.0 | 397.5 | 662.5 |
| Power @ 100 rpm (kW) | 2.8 | 4.2 | 6.9 |
| Max Speed (RPM)3 | 4,2004 | 4,2005 | 4,2006 |
Outside Diameter (ØA): 127 mm (5.00")7
Max Bore (D): 65 mm (approx. 2.6")
Overall Length (TL1): 153.2 mm8
Hub Diameter (ØB): 108 mm9
Length thru' Bore (L1): 64 mm
Gap (G): 3 mm10
How It Works
The L 225 uses the standard jaw-style mechanism but on a much larger scale:
Direct Coupling: Two cast iron hubs are keyed to the driving and driven shafts.
Compression Power: Torque is transferred through a thick, heavy-duty spider insert. The hub jaws compress the spider's arms to move the load.
Misalignment & Vibration: The large mass of the coupling, combined with the elastomeric insert, provides superior damping for low-frequency vibrations and handles angular misalignment up to 1°.
Fail-Safe Security: Even if the spider is destroyed by extreme shock, the heavy cast iron jaws will interlock, maintaining the drive long enough for emergency procedures.
Massive Torque Capacity: With H-Trans inserts, it can handle over 660 Nm, making it suitable for high-horsepower motor outputs.
Large Bore Support: A 65 mm maximum bore allows it to fit on large industrial shafts without needing expensive adapters.
Rugged Construction: Cast iron hubs provide better resistance to heat and physical impacts than smaller models.
No Lubrication: Requires no greasing or regular maintenance, significantly lowering the total cost of ownership.
Standardized Parts: Fully interchangeable with other industry-standard L-type couplings (like Lovejoy or Rathi), making spares easy to find globally.
The L 225 is found in high-torque, "heavy-iron" environments:
Large Industrial Gearboxes: Connecting main drive motors to heavy machinery.
Mining Equipment: Used in vibrating screens, feeders, and large conveyors.
Wastewater Treatment: Driving large aeration fans and high-volume fluid pumps.
Steel & Paper Mills: Used in roller drives and processing lines where reliability is critical.
Power Plants: Connecting auxiliary motors to large fans or coal handling equipment.
The L 225 is a definitive heavy-duty coupling for systems requiring high torque (up to 662.5 Nm) and substantial shaft diameters (65 mm). Its robust 127 mm outside diameter and cast iron build provide the mechanical stability needed for the most aggressive industrial environments. It remains the top choice for engineers looking for a "fit-and-forget" solution that offers both protection and high power capacity.
