OEX Alternator 12V 120A Bosch Style BXA4033

The OEX Alternator 12V 120A Bosch Style is a new rotating electrical unit with an internal regulator, 6 groove pulley and 12 volt output. It is listed under part number BXA4033 and is supplied as each unit, with a power rating of 120 amps for applications that call for this Bosch-style alternator layout.

Key physical details matter on alternators, and this unit uses a twin leg mount with 75mm inside mounting legs, 127mm mount centre to centre, and a pivot hole diameter listed as M10x1.5 / 11. The adjusting hole diameter is 11mm, the pulley outside diameter is 50mm, and the unit weight is 7.15kg.

OEX states this brand is sourced from market leading Original Equipment Manufacturers and aftermarket suppliers, with production from ISO9001 certified factories. For buyers comparing replacements, the most useful checks here are the 12V system, 120A output, Bosch unit make, twin leg mount, and pulley configuration before ordering.

The alternator is backed by a 3yr Passenger 1yr Commercial warranty. That warranty support, along with the supplied dimensions and part number, gives a practical reference point when matching a replacement to the vehicle and the original charging system setup.

Key Features

• 12V alternator with 120A power rating
• Bosch style replacement
• Internal regulator
• 6 groove pulley
• Twin leg alternator mount
• New unit, supplied each

Specifications

• Type: Alternator
• Brand: OEX
• Part No.: BXA4033
• Voltage: 12
• Power Rating (Amp): 120
• Regulator Type: Internal
• Suits Unit Make: Bosch
• Alternator Mount: Twin Leg

Verified fitment applications

• AUDI 80
• AUDI A4
• AUDI A4 2001 to 2004
• AUDI ALLROAD 2001 to 2005
• BMW 3 series 1998 to 2006
• BMW 5 series 1998
• BMW X5
• BMW Z3

Application and Buying Notes

Before ordering, compare the alternator mounting style, pulley type and electrical rating against the unit being replaced. This OEX unit is a 12V, 120A alternator with an internal regulator, a 6 groove pulley, twin leg mount, 75mm inside mounting legs and 127mm centre-to-centre mounting spacing, so those measurements should be checked carefully against the existing part.

The part number BXA4033 is the most reliable reference for confirmation, especially where several alternators may look similar across Bosch-style applications. The listed fitment covers a wide range of passenger and light commercial vehicles, but the correct match still depends on the exact engine and charging system arrangement fitted to the vehicle.

If you are replacing a failed alternator, check the physical connection points, pulley alignment and available clearance before fitting. The 50mm pulley outside diameter, M10x1.5 / 11 pivot hole and 11mm adjusting hole are all useful when comparing the replacement to the original unit.

The warranty listed for this alternator is 3yr Passenger 1yr Commercial. That is useful background, but the main buying decision should still be based on verified part number, unit make, mounting dimensions and the original alternator specification rather than appearance alone.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number BXA4033 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty 3yr Passenger 1yr Commercial, Inside Mounting Legs 75mm, Pivot Hole Diameter M10x1.5 / 11, Pulley Outside Diameter 50mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 127mm, Weight 7.15kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. BXA4033, Brand OEX, Description OEX Alternator 12V 120A Bosch Style, Adjusting Hole Diameter 11, Pin Code IR122, Power Rating (Amp) 120, Pulley Section 6 Groove, Suits Unit Make Bosch, Alternator Mount Twin Leg.

OEX Alternator 12V 120A Bosch Style. Part number BXA4033 should be checked first. Listed voltage is 12. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. Regulator type is Internal. Pulley configuration is 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXA4033, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include AUDI 80, AUDI A4, AUDI A4 2001, AUDI A4 2002, BMW 3, BMW 3 1998. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

The listed warranty is 3yr Passenger 1yr Commercial. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm fitment by matching the vehicle application, part number BXA4033, Bosch unit make, 12V system, 120A output, twin leg mount and the listed mounting and pulley dimensions before purchase.

FAQ

Is this alternator new or remanufactured?

This alternator is listed as new, not remanufactured.

What voltage and output does it have?

It is a 12V alternator with a 120A power rating.

What type of regulator does it use?

It uses an internal regulator.

What mounting style is listed?

The alternator mount is listed as twin leg, with 75mm inside mounting legs and 127mm mount centre to centre.

What pulley setup does it have?

It has a 6 groove pulley with a 50mm pulley outside diameter.

How should I confirm it suits my vehicle?

Match the part number BXA4033, the Bosch unit make, the 12V and 120A specification, and the listed mounting and pulley measurements against the unit being replaced.