B79-3 79x123x18mm Automotive Bearings Deep Groove Ball Bearings

Product Overview

The B79-3 is a single-row deep groove ball bearing with a 79 mm bore × 123 mm outside diameter × 18 mm width, catalogued as an automotive gearbox bearing for transmission shaft support applications. The bearing is produced from GCr15 chrome steel and is supplied open (no integral seals) for lubrication by the transmission oil circuit.

Critical dimensional discrepancy: 123 mm vs. 120 mm outside diameter must be resolved before publication

The supplier form states 79 × 123 × 18 mm. However, the majority of accessible catalogue entries for the B79-3 list 79 × 120 × 18 mm. A smaller set of supplier data supports the 79 × 123 × 18.1 mm envelope, with one Alibaba listing explicitly citing 79X123X18.1mm and a weight of 0.8 kg.

The difference between 120 mm and 123 mm on the outside diameter is material for housing fitment — a 3 mm larger OD will not seat correctly in a housing bored for the 120 mm variant. The supplier must measure the physical stock and confirm which envelope applies. If the stock is the 120 mm OD variant, the Outside Diameter field and the dimensional string must be corrected from 123 to 120. If the stock is the 123 mm OD variant, the listing should note that this is a non-standard or variant envelope relative to the more commonly catalogued 79 × 120 × 18 mm B79-3.

Weight: 0.8 kg is the only internally consistent published figure

The supplier form leaves the Weight field blank. The Alibaba listing for the 79 × 123 × 18.1 mm variant cites 0.8 kg. The multilingual catalogue pages for the 79 × 120 × 18 mm variant consistently state “Contact us for weight” rather than publishing a number. The 0.8 kg figure is dimensionally plausible for a 79 × 123 × 18 mm deep groove ball bearing and should be used only if the stock matches the 123 mm OD envelope. If the stock is the 120 mm OD variant, the weight should be confirmed separately.

Load ratings and speed limits: not published

No accessible public catalogue publishes Cr, C0r, grease speed, or oil speed for the B79-3 in its automotive gearbox designation. The available sources provide dimensions, weight, material, and application, but not standard ISO load ratings. These fields should remain blank or be marked “Consult supplier” rather than estimated from a generic 79 × 123 × 18 mm deep groove ball bearing, because the non-standard envelope and gearbox-specific internal design make a generic estimate unreliable. This is consistent with the pattern across the preceding vehicle-specific listings: OEM gearbox bearings are specified by fitment and assembly position, not by published catalogue load ratings.

Cage material: steel cage is plausible but should be verified

The supplier form specifies Steel Cage / Steel. The Alibaba listing for the 79 × 123 × 18.1 mm variant does not explicitly state the cage material, but describes the bearing as a deep groove ball bearing with GCr15 chrome steel construction. Steel cages are common in automotive gearbox bearings of this size. The cage material should be confirmed against the physical stock; if the stock is nylon-caged, the Cage fields should be updated accordingly.

HS Code correction: 8482102000 is more precise than 8482800000

The supplier form uses 8482102000, which is the correct classification for a single-row deep groove ball bearing. The multilingual catalogue pages for the B79-3 list 8482800000, a broader ball-bearing code. The 8482102000 code in the supplier form is more specific and should be retained.

Key Specifications

Note on application: The supplier form lists the application as the generic “Automotive spare parts.” Catalogue data explicitly identifies the B79-3 as an “Automotive Gearbox Bearing” (自動車ギアボックスベアリング / roulements de boîtes de vitesses automobiles / Rolamentos de caixa de engrenagens automóveis). The Application field should be refined to “Automotive gearbox / transmission bearing” , and the generic “spare parts” description should be replaced.

Performance Features

• Gearbox-specific envelope: The 79 mm bore × 123 mm OD × 18 mm width is sized to a specific gearbox shaft position where a standard metric bearing would not provide the correct shoulder dimensions or axial spacing.

• Deep groove geometry for combined loads: The single-row deep groove raceways carry radial loads from gear mesh and accommodate moderate axial loads in both directions, matching the load spectrum of a transmission shaft.

• GCr15 chrome steel construction: Rings and balls are through-hardened for rolling-contact fatigue resistance under the cyclic loading of automotive gearbox service.

• Steel cage(per supplier form): The steel cage provides robust ball retention and is suited to the oil-lubricated, potentially shock-loaded environment of a gearbox. Confirm cage material against stock.

• Open configuration for oil lubrication: No integral seals; the bearing is lubricated by the gearbox oil circuit, consistent with the wet-sump lubrication strategy of a manual or automatic transmission.

Application

The B79-3 is catalogued as an automotive gearbox bearing for transmission shaft support. In service, a bearing of this type supports a gear shaft under the radial and moderate axial loads generated by the gear train. The 79 × 123 × 18 mm envelope and the open, oil-lubricated configuration are consistent with a direct-fit gearbox service bearing. Replacement requires transmission disassembly and should follow the vehicle manufacturer’s procedure for bearing installation and shaft end-play adjustment.

Ordering & Logistics

• Stock: 92 pcs

• Minimum order: 1 pc

• FOB price: US$10 – US$50 per piece

• Payment: PayPal / Western Union / T/T(100% in advance)

• Delivery: 3–4 workdays after payment

• Shipping: DHL / FedEx / UPS / TNT

• Ports: Shanghai / Guangzhou

• Packing: Standard export packing

• Brand: As required(authorized brands only)

• Country of origin: China

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