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• Model Note:1. The first two digits of the code: the variety of exterior teeth of the gear2. Code 3 and four digits: variety of inside enamel of the gear3. The fifth digit of the code: the bore length of the gear4. English of coding: A: tight becoming B: unfastened fitting2A: It suggests that the central axis is 1.95mm, which is heavily matched with the 2mm optical axis and rotates with the optical axis.2B: It means that the central axis is 2.05mm, which is loosely matched with the 2mm optical axis and rotates freely at the optical axis.For example: 16,102B: exterior tooth=16 teeth, internal tooth=10 teeth, gap diameter=2mm, free axle.Gear diameter: (16+2) x 0.5 (mm)=9mm, gear outer diameter is 9mmCalculation method of gear diameter: (number of teeth+2) x 0.5 (mm)Product Description:Name: Plastic Shaft Double Layer GearsModel: 0.5MMaterial: PlasticUsed:Do DIY science and small production, product design, mechanical model.Remarks: If you have particular needs, please touch us, we are able to customise in line with your needs!The records is measured manually, for reference only, please refer to the real object!Package Include:According in your Choose!

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