# SMR128ZZ Thin-Section Stainless Bearing: 8×12×3.5 mm

Miniature housings sometimes leave only a few millimetres for the bearing section. SMR128ZZ is a stainless steel deep groove ball bearing with an 8 mm bore, 12 mm outside diameter, and 3.5 mm width — a thin ring set that will not swap with a standard 8 mm 608-class part.

The ZZ suffix means metal shields on both sides, which helps keep light contamination out of instruments and small mechanisms. It is not SMR105ZZ (5×10×4) or SMR106ZZ (6×10×3). Measure all three dimensions before you order a “close” MR size.

SMR128ZZ is the Made-in-China page for this exact envelope, listed by Shandong TFL Bearing Co., Ltd. Use it when the drawing calls for an 8×12×3.5 mm stainless shielded bearing.