Adapter sleeves

The adapter sleeve is a tapered element that allows mounting a tapered bore bearing, such as a spherical roller bearing or a Y-bearing, on a plain shaft without a machined shoulder. It is a slotted sleeve: when the nut is tightened, the bearing advances over the cone and the sleeve closes onto the shaft. The assembly includes the nut and the lock washer. It is used in belt or chain drives, conveyors, fans, pumps and process equipment.

The most common series is H, seen in codes such as H204, H 205 and H2321. The number is not the shaft diameter but a size code: the last two digits, multiplied by 5, give the bearing bore in millimeters. In H208, for example, size 08 corresponds to a bearing with a 40 mm bore. The preceding digits indicate the bearing dimension series, as in H2321 or H3122. Each brand writes the code differently: NTN and NSK add suffix letters, as in H 319X or H 205X.

To select the sleeve, you need to know the bearing designation and the shaft diameter. The sleeve must match the bearing series, because the length, taper and thread vary between series, so it is always cross-referenced with the bearing designation and not just the diameter. Correct fit is checked by the reduction in radial internal clearance or by the axial advance of the nut.

The brands we work with in this subcategory are BGL, FAG, Timken, SKF, NTN and NSK. To request a quote, send us the complete sleeve code, or the bearing designation and shaft diameter, and we will indicate the cross-reference between brands. Request a quote by part number at MR via WhatsApp or email and we will respond promptly.