KTR BoWex® FLE-PA
KTR torsionally rigid flange coupling with axial plug-in assembly, for combustion engines and piston pumps.
BoWex® FLE-PA is a torsionally rigid flange coupling, designed to compensate for shaft misalignment arising from manufacturing tolerances or thermal expansion. The range covers sizes 48 to 125 (and the "T" versions, with an additional elastic insert), with maximum finished bore from 48 mm (size 48) to 125 mm (size 125) and nominal torque from 240 Nm at size 48 up to 4,250 Nm at size 125 (5,300 Nm at T 125). The size code, for example BoWex 65 FLE-PA, is read off the manufacturer's SAE flange table, together with the bore diameter required for the motor shaft.
We bring in couplings from the FLE-PA range on order from the European Union, in 1–4 weeks, without own stock and without a public price. For a quotation, the customer sends the coupling size (or the bore diameter and the existing SAE flange), the type of engine or pump driven and the working speed. We check compatibility in the manufacturer's current catalogue before confirming the quotation.
Models and codes
| Code | Note |
|---|---|
| BoWex 65 FLE-PA | size requested by the customer, intermediate bore within the range of the series |
| BoWex FLE-PA 48 | nominal torque 240 Nm, maximum 600 Nm; finished bore 20–48 mm |
| BoWex FLE-PA T 65 | version with additional elastic insert |
| BoWex FLE-PA 100 | SAE 10" flange, frequently on piston pumps |
| BoWex FLE-PA T 125 | nominal torque 5,300 Nm, maximum 13,250 Nm |
Key specifications
| Nominal-maximum torque, full range | 240 – 13.250 Nm |
|---|---|
| Maximum finished bore | 48 – 125 mm |
| Permitted axial displacement | ±1 – ±3 mm |
| Permitted radial displacement | 0.3 – 0.5 mm |
| Permitted angular displacement | ±0.3 – ±0.9 ° |
| Weight | 0.79 – 19.73 kg |
| Operating temperature | up to +60 °C |
The KTR-N 40117 assembly instructions for FLE-PA/FLE-PAC are dated 6 September 2018, and the family remains listed in the current KTR flange coupling catalogues.
Frequently asked questions
What information is needed for a quotation on BoWex FLE-PA?
The coupling size (for example 65 or 100), the bore diameter on the engine side and on the driven side, the type of existing SAE flange and the nominal working speed. These data confirm the mechanical fit before ordering.
Who calculates the permitted torque for the KTR series in applications with vibration?
We do not calculate the permitted torque for each engine-pump combination with cyclic vibration; for such applications a separate torsional vibration calculation is recommended, which we flag when quoting.
Other KTR series
We do not carry out the torsional vibration calculation recommended by the manufacturer for installations with cyclic loading; we supply the coupling with the corresponding technical documentation.
Updated: 2026-11-12