A06B6400H102, A06B6115H001 and A06B0115B103 were all typed into Sparehawk’s search in October, without hyphens. The search reads them either way. What it cannot tell you is whether the unit on a shelf is the one your machine needs. That starts with how Fanuc builds the number.
The prefix names the product group
Fanuc part numbers start with a group code. A02B is used for CNC control units, A06B for servo and spindle motors and amplifiers, A16B and A20B for printed circuit boards, A660 for cables and A860 for encoders and other devices. The group tells you which part of the system you are dealing with before you read the rest.
Motors: A06B-0xxx-Bxxx
An A06B number with a 0 after the first hyphen is a motor. The four digits identify the motor model; the B block identifies the options, such as the shaft, the brake and the encoder. A06B-0115-B103 follows that pattern. Two motors with the same model digits and different B blocks may not be interchangeable: a keyed shaft does not replace a straight one, and a motor without a brake does not replace one with a brake.
Amplifiers and power supplies: A06B-6xxx-Hxxx
A number with a 6 after the first hyphen belongs to the drive electronics: servo amplifiers, spindle amplifiers and power supply modules. The four digits after A06B-6 name the family and the H block names the model within it. A06B-6400-H102 and A06B-6115-H001 follow this pattern. A different H block is a different unit, with a different rating or a different number of axes, even inside one family.
Suffixes and labels
Some numbers carry a suffix after a hash sign for a variant of the base unit. It belongs in the order, and an offer without it is a question to ask, not a match. The label also carries a serial number; a supplier who holds the unit can photograph the label, which is the quickest way to confirm the full number before you order. The counterfeit checks explain what else to look at on the label and the case.
Before you swap
- Note the full number of the failed unit and of the motor or amplifier it works with.
- Back up the CNC parameters, including the servo settings for the axis, which are set for a specific motor.
- If the axis uses an absolute encoder, expect to set the reference position again after the motor or its cable has been disconnected.
- Find out why the unit failed before the spare goes in. The post on repairing a failed drive lists what to check.
Search the full number on Sparehawk. If nobody lists it, a wanted request with the number, the condition you accept and your country lets suppliers who hold it answer. Refurbished units are a normal source for older Fanuc systems; the guide to condition grades explains what each grade means.