H2307 H2309 H2311 Stainless Steel Bearing Adaptor Sleeve

When engineers need to mount a tapered bore bearing onto a plain cylindrical shaft, a bearing adaptor sleeve becomes essential. The H2307, H2309, and H2311 stainless steel bearing adaptor sleeves are precision-ground components designed for locking self-aligning ball bearings or spherical roller bearings in place. Unlike standard carbon steel sleeves, these are machined from martensitic or austenitic stainless steel—often grade 420 or 304—offering inherent corrosion resistance. Each model corresponds to a specific metric shaft diameter: H2307 fits shafts around 30 mm, H2309 for 45 mm, and H2311 for 55 mm, with the “H” prefix indicating a standard withdrawal sleeve geometry.

How do these sleeves work in practice? 
The sleeve slides onto the shaft, followed by the bearing. A locknut and washer tighten against the sleeve’s threaded section, expanding the split sleeve slightly to clamp both shaft and bearing inner ring. The stainless steel composition matters most in washdown applications, food processing, or marine equipment, where moisture or mild acids quickly ruin ordinary steel. These H23 series sleeves also simplify bearing replacement: loosening the locknut releases the grip without damaging the shaft. Their surface hardness typically reaches 250 HB, resisting galling during repeated mounting and dismounting.

How do they differ from conventional KM or H-series sleeves?

Standard carbon steel H sleeves (e.g., H2307 carbon) cost 40–50% less upfront but rust within months in wet environments. Chrome-plated alternatives delay corrosion but chip under vibration, exposing raw steel. By contrast, the all-stainless H2307/H2309/H2311 design offers uniform protection across threads, bore, and outer surface. The trade-off: stainless sleeves have slightly lower tensile strength than heat-treated carbon steel, though for most industrial drives below 3,000 rpm, the difference rarely affects performance.