External Snap Rings for Shafts Buy M2400 (SWM) External Snap Rings (Carbon Steel) through online store. These are External Snap Rings for shafts with grooves. These can be used for the assembly of needle bearings. Please click here to view the range: https://springfasteners.co.uk/product-category/fixings-and-fasteners/snap-rings/external-snap-ring-m2400-2/