| Number | d(mm) | D(mm) | B(mm) |
| 303 SERIE | |||
| 30304 | 20.00 | 52.00 | 15.00 |
| 30305 | 25.00 | 62.00 | 17.00 |
| 30306 | 30.00 | 72.00 | 21.00 |
| 30307 | 35.00 | 80.00 | 21.00 |
| 30308 | 40.00 | 90.00 | 23.00 |
| 30309 | 45.00 | 100.00 | 25.00 |
| 30310 | 50.00 | 110.00 | 27.00 |
| 30311 | 55.00 | 120.00 | 29.00 |
| 30312 | 60.00 | 130.00 | 31.00 |
| 30313 | 65.00 | 140.00 | 33.00 |
| 30314 | 70.00 | 150.00 | 35.00 |
| 30315 | 75.00 | 160.00 | 37.00 |
| 30316 | 80.00 | 170.00 | 39.00 |
| 30317 | 85.00 | 180.00 | 41.00 |
| 30318 | 90.00 | 190.00 | 43.00 |
| 30319 | 95.00 | 200.00 | 45.00 |
| 30320 | 100.00 | 214.00 | 47.00 |
| 30321 | 105.00 | 225.00 | 49.00 |
| 30322 | 110.00 | 240.00 | 50.00 |
| 30324 | 120.00 | 260.00 | 55.00 |
| 30326 | 130.00 | 280.00 | 58.00 |
| 30328 | 140.00 | 300.00 | 62.00 |
| 30330 | 150.00 | 320.00 | 65.00 |
| 30332 | 160.00 | 340.00 | 68.00 |
| 30334 | 170.00 | 360.00 | 72.00 |
| 30336 | 180.00 | 380.00 | 75.00 |
| 30338 | 190.00 | 400.00 | 78.00 |
| 30340 | 200.00 | 420.00 | 80.00 |
Longfei Bearing manufactures the complete 303 series (30300 series) metric single row tapered roller bearings, covering bore sizes from 30304 (20 mm) to 30340 (200 mm). Produced to ISO 355 and DIN 720 standards, every bearing in this range offers internationally interchangeable cone and cup assemblies, making them direct replacements for equivalents from SKF, Timken, NSK, NTN, FAG, and KOYO.
The 303 series occupies the medium-heavy load segment within the metric tapered roller bearing family. Compared with the 302 series (30204–30240), 303 series bearings feature a wider outer diameter at equivalent bore sizes, a slightly larger contact angle, and correspondingly higher axial load capacity per bore size. This profile makes the 303 series the preferred choice where combined radial and axial loads are substantial and installation space along the shaft axis is less constrained.
The 303 series should not be confused with the 323 series (32304–32340), which carries a steeper contact angle designed primarily for axial-dominant loading. The 303 series strikes a practical balance between radial capacity and axial thrust handling, suitable for a broad range of industrial and mobile equipment drivetrains. Get more about 30304–30340 Series Tapered Roller Bearings.
The wide bore range of 30304–30340 (20 mm to 200 mm) makes the 303 series suitable across a broad spectrum of industrial and mobile equipment applications:
Agricultural Machinery — Tractor rear axle transmissions, harvester threshing drum drives, seeder and baler gearboxes, and PTO shaft housings where combined radial and moderate axial loads arise from field operation conditions.
Automotive and Commercial Vehicles — Gearbox layshafts, transfer case drive components, light truck rear axle housings, and differential carrier bearings where the 303 series bore-to-OD ratio suits available housing envelopes.
Industrial Gear Drives and Conveyors — Drive shaft support in helical and bevel gearboxes, roller conveyor drive stations, bucket elevator drives, and screw conveyor shaft ends — particularly for applications where periodic shaft direction reversal creates bidirectional thrust demands resolved through opposing paired mounting.
Electric Motors and Pumps — Medium frame motors with overhung belt or chain loads, centrifugal pump shaft supports in process industry, and compressor crankshaft main bearings.
Mining and Construction Equipment — Crusher feed rolls, vibrating screen drive shafts, auger drives, and wheel loader transmission intermediate shafts, where the 303 series' generous outer diameter delivers higher load capacity in the same bore size compared with lighter series.
Rolling Mills and Metalworking — Non-neck roll applications in smaller-section rolling mills, straightener roll drives, and coil handling equipment spindles.
Longfei 303 series bearings are produced at the Linqing bearing manufacturing base to the following specifications:
Material: GCr15 chromium bearing steel, through-hardened to HRC 60–64. Raceway and rolling surface hardness uniformity is verified by batch sampling.
Dimensional tolerance: P0 (Normal) as standard, consistent with ISO 355 class specifications. P6 and P5 precision classes are available on request for higher-speed or precision applications.
Cage: Standard pressed steel cage. Machined brass cage and polymer cage options available for high-speed, high-temperature, or aggressive lubrication environments.
Pre-lubrication: Standard shipment includes a light rust-preventive oil coating. Grease pre-fill to customer-specified lubricant type is available for ready-to-install requirements.
Conformance: ISO 9001 quality management system. Product dimensions and tolerances conform to ISO 355 and DIN 720.
Longfei accepts OEM and ODM orders for the complete 30304–30340 range. Capabilities include:
Standard production to ISO 355 / DIN 720 with P0, P6, P5 tolerance grades
Non-standard cage materials and sealing arrangements on confirmed orders
Private-label and custom packaging for distributor and OEM customers
Bulk shipment with flexible export packaging: poly bag + single box + carton + pallet
Submit your bearing number, required quantity, tolerance grade, and any special requirements. Our team responds within one business day.
If you are sourcing reliable 30304 tapered roller bearings for automotive, industrial, or machinery applications, we can support your needs with consistent quality and stable supply. Whether you require bulk orders, OEM customization, or specific technical requirements, our team is ready to assist. Contact us today to get detailed specifications and a competitive quotation tailored to your project.
66 Panzhuang Bearing Industrial Park, Linqing City, Shandong Province, China.
+86 635 277 7999
Keywords:
Spherical Roller Bearings, Tapered Roller Bearing, Cylindrical Roller Bearings, Truck Hub BearingCopyright © Linqing Longfei Bearing Co., Ltd. All Rights Reserved. |
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