Established in 2004, BMT Bearings has more than 20 years of bearing manufacturing experience, with automotive air conditioner bearings being one of our main product lines. This bearing series features a fully sealed double-row angular contact ball bearing design and is mainly used in the electromagnetic clutch pulley of automotive A/C compressors.
BMT Bearings Air Conditioner Bearings are built for the pulley and electromagnetic clutch of an automotive A/C compressor — a part that spins continuously in one of the hottest, dirtiest places on the vehicle. Precision grinding and automated assembly keep dimensions consistent and rotation smooth, while a fully sealed design and application-specific grease hold performance steady through long service intervals.
An Air Conditioner Bearing sits inside the A/C compressor assembly, most often within the electromagnetic clutch and pulley group. It lets the pulley rotate freely around the compressor shaft and carries the radial load that the belt and clutch impose on that assembly.
The working conditions are demanding: engine-bay heat, constant vibration, belt tension and contamination. That is why every unit we ship is a fully sealed configuration — sealing protects the grease charge, the grease protects the raceway, and the raceway is what decides whether the pulley still turns quietly after two or three seasons.
The bearing also carries radial and application-specific axial loads, which is why we size the internal clearance and structure to the compressor rather than to a generic catalogue figure.
High-precision raceways and rolling elements cut frictional resistance, so the pulley turns smoothly with less energy loss and less heat build-up — which is what protects the grease over a long service life.
Air Conditioner Bearing has to endure sustained radial load from the belt-driven pulley and the vibration generated by the compressor and clutch. Optimized structure, materials and internal clearances keep that load from turning into premature wear.
Strict control of raceway surface quality and assembly precision minimizes abnormal vibration. In practice, the difference is heard at idle with the A/C on — the whine or rumble that end users complain about first.
Sealed configurations keep the grease charge where it belongs and block dust, moisture and other contaminants from reaching the raceway. That combination is what makes a sealed unit maintenance-free for its whole life.
Specifications are selected per model and per application. The parameters that matter most in an A/C compressor are these:
The table below lists part of our current range. Please confirm the exact specification against the original bearing number, drawing or sample before ordering.
| Part number | Reference code | d (mm) | D (mm) | B/C (mm) |
|---|---|---|---|---|
| 83A693 | 30BGO4S8G / 30BD04S8G-2DS | 30 | 47 | 18 |
| 30BGO5SS5 | 30BD4012DUCG21 / 30BD40DF | 30 | 55 | 23 |
| 32BGO4S3G | 32BG4718BU | 32 | 47 | 18 |
| 35BGO5S6G | 35BGO5S6G | 35 | 52 | 23 |
| 38BGO5S2DG | 38BGO5S6G | 38 | 54 | 17 |
| 40BGS40G | 40BDS524 | 40 | 55 | 24 |
| 40BGO5S1G | 40BGO5S1DS | 40 | 57 | 20 / 24 |
| 40B0219V | 40BD45/DF08B28L8 / 40BGO5S2G | 40 | 57 | 24 |
| 40B249V | 40BGS8G-2DS / 907257 | 40 | 62 | 20.6 |
| 40BGS11DS | 40BGS11G-2DS | 40 | 62 | 24 |
If your reference is not listed, send the original number, a drawing or a clear photo of the worn unit with a ruler alongside, and we will identify the equivalent from the full database. Dimensions outside this range are produced to drawing as non-standard items.
Fitted inside the pulley assembly and supports smooth rotation under belt drive. The deciding factors are dimensional accuracy, sealing, lubrication condition and running noise.
Forms part of the clutch and pulley group on an automotive A/C compressor, absorbing continuous rotation, vibration and the loads produced as the clutch engages and releases.
Different compressor designs call for different dimensions, internal clearances, sealing arrangements and grease. We evaluate the configuration from the part number, drawing, sample or application data.
Related drive components from the same programme include tensioner bearings and clutch release bearings, which can be consolidated into a single shipment. The full range is listed under automotive bearings.
Automotive Air Conditioner Bearings are used mainly in the pulley and electromagnetic clutch assembly of an A/C compressor. The bearing supports the pulley, lets it rotate smoothly around the compressor shaft, and carries the radial load produced by the belt drive and by clutch operation.
Common causes are bearing wear, insufficient lubrication, seal damage, contamination, incorrect installation, excessive belt load and incorrect bearing fit. Other compressor and clutch components can produce a similar noise, so it is worth confirming the source before replacing the part.
Send the original bearing number, inner diameter, outer diameter and width, or a drawing, physical sample or compressor application data. Operating speed and sealing requirements help us confirm the right specification faster.
Yes. We support logo printing, carton design, label customization and private brand packaging, so the goods arrive ready for your own catalogue or distribution network.
MOQ is typically 500–1,000 pieces, depending on the bearing model, production requirements and order quantity. Contact us with the specific model and we will confirm the exact figure before you commit.
Send the part number or drawing through the inquiry form and tell us the evaluation quantity you need. We will confirm the specification, quote the samples, and arrange production so you can verify fit and noise before placing a volume order.
Tell us the original part number, the compressor model, or simply the bore, outer diameter and width. We will confirm the equivalent, quote in USD, and arrange samples before any volume order.
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No.183,Longfeng,West of Zhangting industrial Zone,Yuyao,Ningbo,China
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