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Linear motion racks and rack-and-pinion setsRack selection combines tooth geometry with straightness, mounting method, section stiffness and joint strategy when long travel requires multiple lengths.A rack does not have a single center distance along its entire travel unless its mounting is straight and well supported. Tooth geometry, rack bow, joint continuity and the pinion center height all contribute to local backlash.What to define before opening an RFQModule/DP and pressure angleRack section and lengthMating pinion geometryMounting holes or backing supportStraightness, pitch continuity and joint requirementsFor long travel, show how rack segments are located end-to-end. A joint strategy that controls tooth phase and mounting pitch is more useful than specifying a very tight overall length with no assembly datum.How to use this categoryThe product cards below are linked to the live WooCommerce catalogue for Plastic Gear Racks. Open the closest geometry first, then compare its RFQ guidance against your drawing. If no listed product matches the interface, use the custom component route rather than forcing the part into the wrong family.