# How to Specify 780708K Without Mixing Nearby Parts
Look-alike part numbers are the usual way a stores ticket goes wrong on a forklift chain / sprocket ball bearing with H groove. Do not substitute a plain 40 mm ball bearing without the H groove, or a 780708KS variant without a drawing. The groove and the 40×114×34 mm envelope define this part. A standard deep groove of similar bore will not run in the chain track.
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The envelope to write on the ticket is 40 × 114 × 34 mm. That geometry belongs to 780708K, a forklift chain / sprocket ball bearing with H groove. Measure the removed part or the housing before you trust a faded stamp.
Review 780708K bearing on the TFL Bearing Made-in-China listing. Shandong TFL Bearing Co., Ltd can confirm stock, packing, and any OEM marking once the drawing or sample is attached.