12/24/2023 0 Comments Types of cotter pins and keysIn military standards, MS24665 has replaced AN380 and AN381.Ĭrank cotter pins are short shafts, threaded on one end, with a flat tapered so that the low end of the flat is at the threaded end of the pin. This error has led to deaths.Įxamples of industrial accidents involving cotter pins. Because cotter pins are so readily available, workers are often tempted to replace some special pin that has failed with an.In general, when a fastener must be safetied, properly installed safety wire is preferable to a cotter pin.Always use the largest cotter pin that will fit the hole.In some applications, the spread prongs can be a problem because they can catch on such things as pant legs. The prongs of hammerlock pins are spread by striking the head with a hammer. NominalĬotter pins are ordinarily secured by spreading the prongs. Which lengths are actually available varyīy, for example, the material from which the pin is made. for all other styles, at the end of the shorter prong.for hammerlock ends, at the farthest point of the longer prong.for pins with miter or bevel point ends, at the end of the farthest point of both prongs.The measurement begins at the point where the large end meets the hole into which the pin is inserted. The way the length of a cotter pin is measured depends on the style of the points. The sizes below 5/16 inch are intended to fit a hole 1/64 inch larger than the pin size for pins larger than that the pin and hole size are the same. American standard cotter pin sizes are in nominal fractional inches, starting at 1/32.
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