SKF AN-20 Adaptor Sleeve For 3-7/16 Inch Shaft

SKF AN-20 adaptor sleeve for a 3-7/16 inch shaft is part of SKF’s imperial-size adapter-sleeve system used to mount bearings in unit housings by securing a bearing onto a 3-7/16" shaft with a corresponding locking nut. The sleeve’s bore is precisely sized at 3.4375 inches (87.31 mm) to fit a 3-7/16" shaft, and it is designed to work with the AN-20 locking nut, which requires a matching keyway on the shaft or adaptor-sleeve thread for secure retention. This combination is commonly used with SKF SNW 20-series sleeves in pillow block and plummer block housings to adapt standard bearings to inch-size shafts, providing reliable alignment and clamping when matched with the appropriate seals, spacers, and end covers per housing specifications.