OEX Alternator 12V 90A Hitachi Style HXA110

The OEX Alternator HXA110 is a 12V, 90A unit built in a Hitachi style and supplied new, not remanufactured. It uses an internal regulator, a 6 groove pulley, and a single leg alternator mount, so those details should be checked carefully against the unit being replaced before ordering.

Key dimensions include a 57mm pulley outside diameter, 58mm mount leg thickness, 10.2mm pivot hole diameter, M8x1.25 adjusting hole diameter, and 164mm mount centre to centre. The unit weighs 4.94kg, which can be useful when comparing against the existing alternator during removal.

This alternator is listed as an OEX rotating electrical product with part number HXA110 and pin code IR49. For buyers replacing a Hitachi unit, matching the part number and physical mounting details is usually the safest way to reduce the risk of ordering the wrong component.

Key Features

• 12V alternator with 90A output
• Hitachi style replacement
• Internal regulator
• 6 groove pulley
• Single leg alternator mount
• New unit

Specifications

• Voltage: 12V
• Power rating: 90A
• Part number: HXA110
• Suits unit make: Hitachi
• Regulator type: Internal
• Alternator mount: Single leg
• Pulley section: 6 groove
• Pulley outside diameter: 57mm

Checked fitment details

• Fitment information supplied includes HOLDEN RODEO applications.
• HOLDEN RODEO fitment is referenced for model years 1998, 1999, 2000, 2001, 2002 and 2003.
• Always confirm the alternator part number HXA110 and the physical mount and pulley details before purchase.

Application and Buying Notes

Before buying, compare the existing alternator against the listed HXA110 details: 12V, 90A output, internal regulator, 6 groove pulley, and single leg mounting. The mount centre to centre measurement of 164mm, the 57mm pulley outside diameter, and the 58mm mount leg thickness are all practical checks that can prevent a mismatch.

If you are replacing a Hitachi-style alternator, the suitability of the unit depends on more than just voltage. The pivot hole diameter of 10.2mm and the M8x1.25 adjusting hole are important because small differences in bracket and ear dimensions can stop the alternator lining up correctly in the engine bay.

The warranty listed is 3 years for passenger use and 1 year for commercial use. That does not remove the need to verify fitment first, but it does provide a clear ownership expectation once the correct unit has been selected and installed.

For Holden Rodeo applications, use the vehicle details, the existing alternator part number if available, and the mounting measurements together. That is the most reliable way to confirm whether this OEX HXA110 alternator is the correct replacement for the vehicle on hand.

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 HXA110 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, Mount Leg Thickness 58mm, Pivot Hole Diameter 10.2, Pulley Outside Diameter 57mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 164mm, Weight 4.94kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. HXA110, Brand OEX, Description OEX Alternator 12V 90A Hitachi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR49, Power Rating (Amp) 90, Pulley Section 6 Groove, Suits Unit Make Hitachi, Alternator Mount Single Leg.

OEX Alternator 12V 90A Hitachi Style. Part number HXA110 should be checked first. Listed voltage is 12. Listed output rating is 90. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single 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 HXA110, 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 90 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using the part number HXA110, the Hitachi style application, and the physical measurements listed here before ordering. If the existing alternator does not match the 12V, 90A, internal regulator, single leg, 6 groove setup, check the vehicle carefully rather than assuming interchange.

FAQ

What is the part number for this alternator?

The part number is HXA110. For this listing, part number HXA110 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN RODEO, HOLDEN RODEO 1998, HOLDEN RODEO 1999. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is listed as new. For this listing, part number HXA110 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN RODEO, HOLDEN RODEO 1998, HOLDEN RODEO 1999. These details should still be checked against the original unit before ordering.

What voltage and amperage does it have?

It is a 12V alternator with a 90A power rating. For this listing, part number HXA110 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN RODEO, HOLDEN RODEO 1998, HOLDEN RODEO 1999. These details should still be checked against the original unit before ordering.

Does it have an internal regulator?

Yes. The regulator type is listed as internal. For this listing, part number HXA110 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN RODEO, HOLDEN RODEO 1998, HOLDEN RODEO 1999. These details should still be checked against the original unit before ordering.

What pulley and mounting details should I check?

Check the 6 groove pulley, 57mm pulley outside diameter, single leg mount, 58mm mount leg thickness, 10.2mm pivot hole diameter, M8x1.25 adjusting hole, and 164mm mount centre to centre. For this listing, part number HXA110 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN RODEO, HOLDEN RODEO 1998, HOLDEN RODEO 1999. These details should still be checked against the original unit before ordering.

What warranty is listed?

The listed warranty is 3 years for passenger use and 1 year for commercial use. For this listing, part number HXA110 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN RODEO, HOLDEN RODEO 1998, HOLDEN RODEO 1999. These details should still be checked against the original unit before ordering.