1.Product Overview HTFB31-13E non-standard open deep groove ball bearing, dimension 31mm bore × 76mm outer diameter × 13mm width, HTFB dedicated transmission series with E upgraded precision tolerance. Open design without rubber seals, equipped with stamped steel cage and standard C0 clearance. It bears radial load and slight bidirectional axial load, operates stably and low-noise under long-term high-speed shifting vibration. Made of fully quenched high-purity GCr15 chrome