SAE 10
SAE 10 Flywheel Standard – Coupling Fitment Guide
The SAE 10 flywheel standard specifies the outer diameter, bolt circle, and bolt pattern for connecting diesel engines with couplings, hydraulic pumps, and power transmission components. This globally recognized standard ensures that engine OEMs and coupling manufacturers provide perfectly matching parts for safe torque transfer and long-term reliability.
SAE 10 Dimensions (Catalogue Reference):
- Outer diameter (Ø): 314.25 mm
- Bolt pattern (Z): 8 × Ø10.5
- Bolt circle (DO): Ø295.3 mm
Applications in Couplings:
SAE 10 is one of the most common flywheel sizes for mid-range diesel engines used in construction machinery, marine generators, and agricultural equipment. OEM coupling solutions include:
- KTR BoWex® FLE-PA – torsionally stiff curved-tooth flange couplings.
- KTR BoWex® Elastic – flexible couplings with vibration damping properties.
- CENTAFLEX-K – elastic couplings designed in close cooperation with major engine manufacturers.
Why SAE Standards Matter:
By following the SAE 10 geometry, coupling producers guarantee direct fitment to flywheels from engine brands such as Perkins, Deutz, Caterpillar, John Deere, and Volvo Penta. This standardization avoids misalignment, improves service life, and ensures the drive train operates safely and efficiently.
⚠️ Only original couplings (e.g., KTR BoWex FLE-PA, BoWex Elastic, CENTAFLEX K) manufactured to SAE specifications ensure correct bolt alignment and torque handling. Non-original parts may look similar but often fail to meet dimensional accuracy, leading to vibration, premature wear, or drive train failure.
