OEX Alternator 12V 125A Hitachi Style HXA087

The OEX HXA087 is a 12V, 125A alternator built in Hitachi style for rotating electrical applications. It is a new unit, supplied as each, with an internal regulator and a 6 groove pulley, making it important to match the physical and electrical details carefully before fitting.

This alternator is listed with a twin leg mount, 82mm inside mounting legs, 157mm mount centre to centre, and a 10mm pivot hole diameter. The adjusting hole is M8x1.25, the pulley outside diameter is 63mm, and the unit weighs 6.5kg, so it is worth comparing all mounting points and belt drive dimensions against the unit being replaced.

OEX identifies this alternator as suitable for Hitachi units and gives it part number HXA087. The product carries a 3 year passenger / 1 year commercial warranty, and the brand notes supplied describe OEX as sourced from original equipment and aftermarket suppliers, with ISO9001 certified factories supporting engineering, testing, and quality control procedures.

Key Features

• 12V alternator with 125A output
• Hitachi style replacement
• Internal regulator
• 6 groove pulley
• Twin leg alternator mount
• New unit, supplied each

Specifications

• Brand: OEX
• Product type: Alternator
• Voltage: 12V
• Power rating: 125A
• Part number: HXA087
• Suits unit make: Hitachi
• Regulator type: Internal
• Alternator mount: Twin leg

Fitment guidance

• Fitment information supplied includes applications for Infiniti Q45 and Nissan 350Z.
• Sample applications listed include Infiniti Q45 1993, 1994, 1995 and 1996.
• Sample applications listed include Nissan 350Z 2003 through 2009.
• Fitment data also references Nissan, Infiniti, Nissan Infiniti, Nissan Maxima and Nissan Maxima / Maxima QX groupings.
• Confirm the alternator mount, pulley type, regulator type, and part number before ordering.

Application and Buying Notes

Before buying, compare the part number HXA087, the 12V system voltage, and the 125A output with your existing alternator or vehicle requirements. The mounting arrangement is a twin leg design with 82mm inside mounting legs and 157mm centre to centre, so a close physical match matters as much as the electrical rating.

The pulley details are also important. This unit uses a 6 groove pulley with a 63mm outside diameter, so the belt profile and pulley size must align with the vehicle setup. A mismatch here can prevent correct belt tracking or make the alternator unsuitable even if the electrical rating appears correct.

The internal regulator is another key checkpoint. If the removed unit uses a different regulator arrangement, the alternator may not be a direct fit without further verification. The listed pivot hole diameter of 10mm and adjusting hole diameter of M8x1.25 should also be checked against the existing brackets and hardware.

This alternator is a new OEX unit, not a remanufactured part, and it weighs 6.5kg. If you are replacing a failed alternator, it is sensible to compare the old unit’s mounting ears, pulley section, and regulator type before purchase, especially where the vehicle history is uncertain or the previous alternator has already been changed.

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 HXA087 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 82mm, Pivot Hole Diameter 10, Pulley Outside Diameter 63mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 157mm, Weight 6.5kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. HXA087, Brand OEX, Description OEX Alternator 12V 125A Hitachi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR31, Power Rating (Amp) 125, Pulley Section 6 Groove, Suits Unit Make Hitachi, Alternator Mount Twin Leg.

OEX Alternator 12V 125A Hitachi Style. Part number HXA087 should be checked first. Listed voltage is 12. Listed output rating is 125. 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 HXA087, 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 125 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment by checking the part number HXA087, the Hitachi-style application, and all mounting and pulley details against the unit being replaced before ordering.

FAQ

What is the part number for this alternator?

The part number is HXA087. For this listing, part number HXA087 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include INFINITI Q45, INFINITI Q45 1993, INFINITI Q45 1994. These details should still be checked against the original unit before ordering.

What voltage and output does it have?

It is a 12V alternator with a 125A power rating. For this listing, part number HXA087 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include INFINITI Q45, INFINITI Q45 1993, INFINITI Q45 1994. These details should still be checked against the original unit before ordering.

Is this a new or remanufactured unit?

It is listed as new. For this listing, part number HXA087 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include INFINITI Q45, INFINITI Q45 1993, INFINITI Q45 1994. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It uses an internal regulator. For this listing, part number HXA087 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include INFINITI Q45, INFINITI Q45 1993, INFINITI Q45 1994. These details should still be checked against the original unit before ordering.

What pulley configuration is listed?

It has a 6 groove pulley with a 63mm outside diameter. For this listing, part number HXA087 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include INFINITI Q45, INFINITI Q45 1993, INFINITI Q45 1994. These details should still be checked against the original unit before ordering.

What warranty is supplied with this alternator?

The listed warranty is 3 years for passenger use and 1 year for commercial use. For this listing, part number HXA087 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include INFINITI Q45, INFINITI Q45 1993, INFINITI Q45 1994. These details should still be checked against the original unit before ordering.