OEX Alternator 12V 120A Bosch Style BXA059

The OEX Alternator 12V 120A Bosch Style, part number BXA059, is a new rotating electrical unit with a 12-volt output and 120 amp power rating. It is listed with a Bosch-style unit make, an internal regulator, and a quad leg alternator mount, so it is intended for buyers who need to match the physical and electrical details of the existing alternator closely.

Key identification points include pin code IR120, a 5 groove pulley, and mounting dimensions of M10x1.25 / 11 for both the adjusting hole and pivot hole. The centre-to-centre mount measurement is 136 mm, and the pulley outside diameter is 54 mm, which are all useful checks when confirming a replacement alternator.

This alternator sits in the OEX rotating electrical range and is backed by a 3 year passenger / 1 year commercial warranty. The unit weighs 5.8 kg, and the specification set is designed to help you compare the replacement against the vehicle’s original charging system before ordering.

Key Features

• 12V alternator with 120A power rating
• Bosch style unit make
• Internal regulator
• 5 groove pulley
• Quad leg alternator mount
• New unit, not remanufactured

Specifications

• Brand: OEX
• Product type: Alternator
• Voltage: 12V
• Power rating: 120 amp
• Part No.: BXA059
• Unit of measure: Each
• Regulator type: Internal
• Pulley section: 5 groove

Fitment information provided

• Holden Astra
• Holden Astra 2007
• Holden Astra 2008
• Holden Astra 2009
• Holden Astra 2010

Application and Buying Notes

Before ordering, match the part number BXA059 and the listed Bosch-style application details against the unit you are replacing. The important checks here are the 12V system, 120A output, IR120 pin code, internal regulator, and the physical mounting details such as the quad leg mount, 136 mm centre-to-centre measurement, and M10x1.25 / 11 hole sizes.

The pulley specification matters as much as the electrical rating. This alternator uses a 5 groove pulley with a 54 mm outside diameter, so the belt arrangement on the vehicle needs to be compatible with that setup. If the belt count, pulley diameter, or mounting layout differs from the original unit, the alternator should not be assumed to suit.

Fitment references supplied for this part include Holden Astra and sample applications for 2007, 2008, 2009, and 2010. Even with those references, it is still best practice to verify the existing alternator label, plug style, mounting points, and pulley profile on the vehicle before purchase. That is especially important when replacing a Bosch-style unit, because small differences in regulator type or mounting arrangement can affect installation.

The OEX warranty is 3 years for passenger use and 1 year for commercial use, so the intended use case matters when comparing options. If the vehicle is used commercially, confirm the warranty terms and make sure the replacement is selected on the basis of the actual unit fitted to the vehicle rather than only on appearance or model name.

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 BXA059 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, Pin Code IR120, Power Rating (Amp) 120, Pulley Section 5 Groove, Suits Unit Make Bosch, Alternator Mount Quad Leg, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. BXA059, Brand OEX, Description OEX Alternator 12V 120A Bosch Style, Adjusting Hole Diameter M10x1.25 / 11, Pivot Hole Diameter M10x1.25 / 11, Pulley Outside Diameter 54mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 136mm.

OEX Alternator 12V 120A Bosch Style. Part number BXA059 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 Quad Leg. Regulator type is Internal. Pulley configuration is 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXA059, 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 HOLDEN ASTRA, HOLDEN ASTRA 2007, HOLDEN ASTRA 2008, HOLDEN ASTRA 2009. 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.

Compatibility note: Confirm compatibility by matching part number BXA059, Bosch-style application details, 12V 120A rating, IR120 pin code, and the listed mounting and pulley measurements against the original alternator before ordering.

FAQ

What is the part number for this alternator?

The part number is BXA059.

What voltage and output does it have?

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

Is this a new or remanufactured unit?

It is listed as a new alternator.

What type of regulator does it use?

It uses an internal regulator.

What pulley and mounting details are listed?

It has a 5 groove pulley, a 54 mm pulley outside diameter, a quad leg mount, and a 136 mm mount centre-to-centre measurement. The adjusting and pivot hole diameters are both listed as M10x1.25 / 11.

Which vehicles are referenced for fitment?

Fitment references provided include Holden Astra, with sample applications for 2007, 2008, 2009, and 2010. The exact application should still be confirmed against the existing unit and part number.