This wing nut will fit all model balancers with 40mm X 4mm shaft. To check, measure the shaft diameter (40mm) and the thread spacing (4mm) on your balancer shaft. Thread spacing is the distance of one thread and one space; for example, the distance from the left edge of a thread to the left edge of the next thread (Approximately 7 threads per inch). NOTE: YOU MUST CHECK THE SHAFT THREAD PITCH ON YOUR 40mm SHAFT TO SEE IF YOU HAVE A 3mm, 4mm or 5mm BEFORE ORDERING. THIS FITS 40mm X 4mm SHAFTS ONLY! Fits all of the following wheel balancer models with a 40mm X 4mm thread pitch shaft. ---Accuturn: 1220, 1250, 1420, 1450, 1520, 1550, 1650, 1820 & 1850 ---Bosch: WB 310, WB 410, WB 520, WB 720, WB 820 ---Coats: 6200HS, XR 1750, XR 1800, XR 1850 ---Jericho: JES510V ---FMC: 4100, 4300, 5800 Std, 5800 MCD ---John Bean: 3.2 (HS), 3.3, 5.
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