However, it doesn't necessarily mean that your calculations will match with the shaft or bore. You can measure a retaining clip's outside diameter (OD) or inside diameter (ID). One common problem is having incorrect measurements relative to the shaft or bore when it comes to circlips. How to tell what circlip fits a shaft or bore? Refer to the charts below for a simple circlip guide. If however, you want to measure the circlip itself to see what shaft it suits, the correct way is by measuring from the outside on one side, then to the inside on the other. For example, a 30mm shaft will require a 30mm circlip (keeping in mind that the inside diameter of the circlip will measure less than 30mm as it has not yet expanded). The best way to find the external circlip size you need, is to measure the outside diameter of the shaft (not the circlip groove). How to measure external circlip size?Įxternal circlips fit snug around the shaft and press against it instead of outward, unlike the internal circlip. Refer to the charts below for a simple circlip guide . Please note if your application has a circlip that is not standard (heavy duty version) then the width and depth need to be measured on the shaft/bore and the circlip. Most if not all circlip grooves and circlips will be machined/made to a standard. If however, you want to measure the circlip itself to see what bore it suits, the correct way is by measuring from the outside on one side, then to the inside on the other. For example, a 30mm bore will require a 30mm circlip (keeping in mind that the 30mm circlip will not measure 30mm on the outside diameter as it is not yet compressed). The best way to find the internal circlip size you need, is to measure the inside diameter of the bore (not the circlip groove). Internal circlips are retaining rings that fit inside a cylindrical bore or housing and push in an outward motion. In simpler terms, external rings are snug around the shaft and press against it, while internal rings fit inside a cylindrical bore and push outwards. Meanwhile, you can clinch an internal circlip to fit inside a bore before it springs back into a shape, forming a shoulder in the housing. Then, it closes into a fitted annular recess around the shaft. You can split an external circlip at a certain point in that it springs open and fits around a shaft. Circlips can also serve as an assembly's detachable shoulder to hold tools in a bore or shaft.Ĭirclips are also known as retaining rings, snap rings, retaining clips, and C-type It allows rotation on a machined groove while preventing lateral movement. This type of fastener is usually made from metal like steel or stainless steel. Circlips are open-ended metal rings used to secure a pinned connection.
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