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If you see additional markings on a metal bearing, these will further specify qualities that your replacement bearings should have.

Too often, a newly ordered plastic bearing is measured right out of the box using calipers, a measuring instrument made of two long, thin metal pieces adjoined together. When the dimensions of the bearing do not match catalog values, the bearings are typically returned. However, the bearing may not have been the wrong size – plastic plain bearings are simply measured differently than their metal counterparts.

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There you have it. Now, you know that plastic and metal bearings require different measuring techniques. Follow the simple steps above and you'll get their measurements right every time -- and you won't have to worry about returning your plastic plain bearings again.

To measure the ID, place the outer anvils of the caliper against the inside bore. The fit does not need to be tight to be accurate. Read the value from the caliper.

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Whether you are looking to replace an old bearing or seeking out extras to have on hand, knowing how to measure your bearings beforehand is important and can save you some hassle. This article will describe how to measure both metal ball bearings as well as plastic plain bearings, both of which are to be approached differently. Let’s start with plastic plain bearings.

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Note that bearings can be in imperial or metric sizes. Usually metric sizes are in full millimeters, but if you see a measurement that is a half millimeter, it’s likely that the bearing is actually in inch sizing.

What matters most with a plastic shaft is whether the shaft can fit through the bearing. Minor variations in the width of the bearing (i.e. the peaks and valleys of the inner diameter of the bearing) are relatively unimportant because these will eventually smooth out due to the gradual release of embedded lubrication.

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Additional markings will indicate a clearance value, which is the room between bearing races for expansion, adding an amount of play.

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igus® makes plain plastic bearings among other engineered wear-resistant plastic products. To find out more about whether plastic bearings will work for your application, visit our webpage.

The best way to find out the size of a given metal ball bearing is to find a reference number on the bearing itself. Usually this number is engraved or laser stamped into the bearing.

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First, plastic plain bearings do not lend themselves well to measuring with calipers. The jaws can press themselves into the material, compress it and create more than one measure since plastic is soft.

A pin-gauge test is what igus® uses to measure its bearings. During the test, a pin that parallels the size of the intended shaft is inserted through the top of the press fit bearing. If it falls through the bearing by virtue of its own weight, it’s a “go”. If the pin sticks or fails to fall through the bearing, it’s a “no-go.”

Heavy-duty bearings from igus® are perfect for use within dusty and dirty environments. In this video, we get hands on and show off just how well igus®’ heavy-duty plastic bearings can perform even when covered in dirt and dust. Request your own heavy-duty bearings sample box: https://www.igus.com/industries/heavy-duty-sample-box-request Learn more about heavy-duty bearings from igus®: https://www.igus.com/industries/heavy-duty-bearings

The terms "igus", "Apiro", "chainflex", "CFRIP", "conprotect", "CTD", "drylin", "dry-tech", "dryspin", "easy chain", "e-chain", "e-chain systems", "e-ketten", "e-kettensysteme", "e-skin", "e-spool", "flizz", "ibow", "igear", "iglidur", "igubal", "kineKIT", "manus", "motion plastics", "pikchain", "plastics for longer life", "readychain", "readycable", "ReBeL", "speedigus", "triflex", "robolink", "xirodur", and "xiros" are legally protected trademarks of the igus® GmbH/ Cologne in the Federal Republic of Germany and where applicable in some foreign countries.

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Second, plastic plain bearings are made slightly oversized because they are designed to be press fit. Only after being arbor pressed into its final shape will a plastic bearing be ready to be measured properly. Click here for installation instructions.

The three lengths measured to determine a metal bearing’s dimensions are the inner diameter (ID), outer diameter (OD) and width (W), as shown in the image below. (Fig. 1 below: “bearing_measure_guide.jpb”; Bearingboys, 17 February 2021, https://www.bearingboys.co.uk/Measuring-Bearings-15-a; photograph)

However, if the number has been rubbed off, measuring a metal bearing can be done with vernier calipers. Though less accurate, a steel ruler can be used if calipers are not available.(Photo, right: “Digital calipers” by Dvortygirl, licensed under CC BY-SA 3.0)

igus® GmbH points out that it does not sell any products of the companies Allen Bradley, B&R, Baumüller, Beckhoff, Lahr, Control Techniques, Danaher Motion, ELAU, FAGOR, FANUC, Festo, Heidenhain, Jetter, Lenze, LinMot, LTi DRiVES, Mitsibushi, NUM,Parker, Bosch Rexroth, SEW, Siemens, Stöber and all other drive manufacturers mention in this website. The products offered by igus® are those of igus® GmbH