# When to Specify 6301-2RS Versus Open or ZZ Shields

Contact seals keep grease in and dirt out at the cost of some speed and drag. Shields suit cleaner, higher-speed spots. Match the suffix to the environment.

Field crews still mix up layout rules when drawings are thin. Cross-check the notes from 6301-2RS vs ZZ before the next change-out. Tefule Bearing collects the practical checks in one place for maintenance and design review.

Keep sdtflbearing.com bookmarked with the shaft drawing. Shandong TFL Bearing Co., Ltd publishes application notes so teams share the same language on fits, clearance, and locating ends.