Very high quality BGM PRO special clutch nut for all Vespa Largeframe
Replaces the castle nut (used by Piaggio up to approx. 1990)

ADVANTAGES

  • Replaces the original clutch castle nut
  • Significantly higher tightening torque possible: >70Nm (not more than 100Nm)
  • Safe handling
  • No more special tools (crown nut wrench) required
  • Standard hexagon (width across flats 15)
  • Suitable for all Largeframe with old 6/7 spring clutch type

FITS
The nut is suitable for all vehicles built from 1950 onwards, e.g. V1-V5, VNB, VNA, GS150, GS160, Sprint, Rally, GT, GTR, T5, Cosa1, PX, PE etc...

  • Suitable for all Largeframe with old 6/7 spring clutch type

This nut completely replaces the old-fashioned castle nut and thus enables safe and precise work even with a torque wrench. In addition to the precise production, it is also suitable for a tightening torque of over 70Nm due to the use of steel with a hardness of 10 (in our internal tests we were able to load the nut with a tightening torque of 170Nm).
Conventional castellated nuts often give up at 40Nm. With the BGM nut, slipping and damage to the crankshaft/clutch hub due to a loose clutch nut is a thing of the past.

TECHNICAL DATA

  • Hardness: 10
  • Thread: M12x1.50 (with collar)
  • Diameter at collar: 18.6mm
  • Height: 9mm
  • Width across flats: 15
  • Incl. matching serrated lock washer

NOTE
The nut must not be fitted with an impact wrench.
The nut has enormous toughness and tensile strength. However, due to its special design, which is due to the limited space available, it is not suitable for the extremely high load peaks of modern cordless impact wrenches. These not only easily reach twice the guaranteed tightening torque of the nut, but also generate load peaks that can no longer be absorbed by the elasticity of the nut. If the nut is tightened as prescribed using a conventional (manual) torque wrench, it is a very reliable and durable solution. Its large safety reserves far exceed those of the original nut.

Conclusion: No more slipping when loosening/tightening the nut and a bombproof clutch.

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Anonym  08/25/2015

gute Alternative zur Kronenmutter, Fächerscheibe dazu ist aber unnötig, Nord-Lock ist empfehlenswerter!!

Christoph O. from Wien 08/13/2025
Anonym  10/14/2016

It could be cheaper.

Anonym  10/15/2016

great service !!!

Swiss P. from Rheinfelden 09/14/2025
Andres R. from Lorca 09/10/2025
Markus E. from Eschweiler 09/05/2025
Wolfgang P. from Salach 08/31/2025
Itzik S. from Rishpon 08/28/2025
Giuseppe F. from Dagersheim 08/27/2025
Marcel J. from Emmerich 07/22/2025
Hendric W. from Duisburg 05/29/2025
General
EAN
4251389102823
 
OEM numbers (for comparison purposes only)
Scooter Center:
7671201
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