B77-4ANX 77x125x20mm Automotive Bearings Deep Groove Ball Bearings

Product Overview

The B77-4ANX is a single-row deep groove ball bearing with a 77 mm bore × 125 mm outside diameter × 20 mm width, supplied as a non-standard 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.

Model designation note: 77 mm bore is unusual for this series and should be verified

The 77 mm bore is dimensionally consistent with the overall envelope and is plausible for a large-shaft automotive gearbox bearing of this class. However, it is worth noting that no public catalogue entry for the exact designation B77-4ANX was located in the accessible search results, and the closest nominal match (the aerospace "B77" listing) is an entirely different, much smaller bearing (≈9.5 mm bore). The model number should be confirmed against the physical part and the supplier's invoice before publication. If the actual designation carries a suffix or a slightly different prefix, correcting it now avoids search invisibility and buyer confusion later.

Cage material: the supplier form specifies steel, but nylon is common in this bearing family

The supplier form specifies Steel Cage / Steel. Preceding listings in this automotive non-standard deep groove series (such as B76-2ANX4) are consistently catalogue-confirmed with nylon cages, and nylon is a common cage material for oil-lubricated gearbox bearings of this size and class. The steel cage specification is not inherently wrong — steel cages are also used in automotive gearbox bearings — but the cage material should be confirmed against the physical stock rather than assumed. If the stock is steel-caged, the listing is correct; if it is nylon-caged, the Cage fields should be updated.

Weight and performance data: not published

The supplier form leaves Weight, Cr, C0r, grease speed, and oil speed blank. No accessible public catalogue publishes these values for the B77-4ANX in its automotive designation. The search results for dimensional and load-rating queries returned unrelated aerospace bearing data and mathematical tables, none of which correspond to this 77 × 125 × 20 mm automotive bearing. These fields should remain blank or be marked "Consult supplier" rather than estimated from a generic 77 × 125 × 20 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.

Key Specifications

Performance Features

• Non-standard gearbox envelope: The 77 mm bore × 125 mm OD × 20 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 and accommodate moderate axial loads in both directions, matching the combined load spectrum of a transmission shaft under gear mesh forces.

• 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. If the actual stock is nylon-caged, the nylon cage offers lower friction and is equally common in this application.

• 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 B77-4ANX is documented as an automotive bearing in the supplier's listing, with the application field describing it as "Automotive spare parts." The 77 × 125 × 20 mm envelope and open, oil-lubricated configuration are consistent with a gearbox or transmission shaft service bearing. In service, a bearing of this type supports a gear shaft under the radial and moderate axial loads generated by the gear train. Replacement requires transmission disassembly and should follow the vehicle manufacturer's procedure for bearing installation and shaft end-play adjustment.

Ordering & Logistics

• Stock: 91 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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