Woodruff wedge / Woodruff key for precise positioning of the crankpin.
The cotter key, also known as the pole wheel key, is mounted in the crankpin of a number of mopeds.
Length: 9.3 mm
Height: 3.8 mm
Width: 3 mm
| Material | Steel |
| Total length | 9.3 mm |
| Width | 3 mm |
| Height | 3.8 mm |
| Universal | |
| Puch | E50 ZA50 (air-cooled) ZA50 (fan-cooled) Z50 (X30 Sport) Z50 (X30 Velux) 2-speed MS, MV, MV50 3-speed VSD, DS, VZ, MC |
| Sachs | 50 (Fahrtwind, 1.25 / 1.5 hp, DE) 502 (Saxonette) - AL , AML 50/2 - L CH (0.8 PS) , ML CH (0.8 PS) , MB (2.6 PS) , MLB (2.6 PS) 50/3 50/4 - MLFB (2.6 PS) , LKH (4.5 PS) 50/5 503 - AAL , ABL , 2AL / 2BL , AB , AC , ADV 505 (with pedal shaft) - 1A (AT) , 2A (HG) , 2B (HG) 535 506 - 3B |
| Zündapp Belmondo | |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima , GT |
| Zündapp | 434 Chassis (mountaineer) 247 Motor 278 Motor |
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