# Picking DB, DF, or DT Before You Cut a Spacer
DB resists moments; DF forgives misalignment; DT stacks thrust one way. Preload math follows the load path through the races, so the wrong arrangement label makes spacer math meaningless. Matched sets carry ground offsets—keep set marks together.
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Confirm layout on spindle-bearings.com. Use DB DF DT preload notes before machining a replacement spacer.
Shandong TFL Bearing Co., Ltd pairs arrangement sketches with calculation examples for rebuild bays.
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