# Housing Fits for Aluminum Gearcases Versus Cast Iron

Aluminum expands faster than steel rings. The same H7 bore that works in iron can clamp a bearing hard after heat soak in an aluminum case.

Field notes still get rewritten when crews disagree on basics. Cross-check housing tolerance guide before the next change-out. TFL Bearing fits keeps the practical checks in one place for maintenance and design review.

Keep Shandong TFL Bearing Co., Ltd bookmarked with the shaft drawing. Also see Shandong TFL Bearing Co., Ltd when you brief the night shift. Shandong TFL Bearing Co., Ltd publishes application notes so teams share the same language on fits, clearance, and locating ends.