OEX Alternator 24V 40A Nikko NXA603

The OEX Alternator 24V 40A Nikko is a new rotating electrical unit, identified by part number NXA603 and pin code IR30. It is built for 24 volt systems with a 40 amp power rating, and it suits Nikko applications where the mounting style and electrical connections match the listed specifications.

Key physical checks on this alternator include a 220mm mount centre to centre measurement, 86mm inside mounting legs, a 13mm pivot hole diameter, and an M10x1.25 adjusting hole. The pulley is a BB section unit with an outside diameter of 81mm, and the shaft dimension is 17mm.

This alternator uses an internal regulator and is supplied as a new unit rather than remanufactured. It is sold as each, weighs 8.08kg, and is backed by a 3 year passenger / 1 year commercial warranty. That warranty support sits alongside OEX sourcing and quality controls through OEM and aftermarket supply channels.

For buyers matching a replacement alternator, the most important checks are voltage, amperage, mounting layout, pulley type, and the part number NXA603. Those details matter more than the vehicle badge alone, especially on commercial and industrial applications where similar-looking alternators can differ in leg length, hole size, or regulator arrangement.

Key Features

• 24V, 40A alternator for Nikko applications
• New unit, not remanufactured
• Internal regulator
• Twin leg alternator mount
• BB pulley section with 81mm outside diameter
• Part number NXA603

Specifications

• Brand: OEX
• Product type: Alternator
• Description: OEX Alternator 24V 40A Nikko
• Part number: NXA603
• Suits unit make: Nikko
• Voltage: 24V
• Power rating: 40A
• Regulator type: Internal

Fitment guidance

• Supported make groups listed for this alternator include Nikko applications, with fitment data also referencing vehicles and equipment from Hino, Ford, Franna, Grove, Hitachi, International, Isuzu, Kobelco, Mitsubishi Fuso, Nissan Industrial, Nissan UD, Scania, Toyota Industrial, UD Trucks, Mazda, Massey Ferguson, and related sub-models.
• Examples in the fitment data include Hino 500 Series, Ford N-Series, Franna AT-14, Grove AT745, Hitachi EX220-5, International N-Series, Isuzu C/E Series, Kobelco SK200-8, Mitsubishi Fuso Canter, Nissan UD C Series, Scania 3-Series, Toyota Industrial forklifts, and UD Trucks Condor.
• Year and model references appear in the fitment data for some applications, but the correct match still depends on the part number, mounting measurements, pulley specification, and regulator type.

Application and Buying Notes

Before ordering, compare the part number NXA603 with the unit being replaced, then check the 24V electrical system and the 40A output rating. On alternators, the voltage and amperage need to align with the vehicle or machine system requirements, and the wrong output can create a poor match even when the mounting points look similar.

Measure the mounting side carefully. This unit has 220mm mount centre to centre, 86mm inside mounting legs, a 13mm pivot hole diameter, and an M10x1.25 adjusting hole. If any of those dimensions differ from the existing alternator, the unit may not physically install correctly without modification, so it is worth comparing the old part before purchase.

The pulley details are also important. This alternator uses a BB pulley section and a pulley outside diameter of 81mm, with a 17mm shaft dimension. These details help confirm that the belt and pulley arrangement will suit the application as intended, particularly on commercial and industrial equipment where pulley profiles are often specific.

The internal regulator is another useful checkpoint. Some charging systems are designed around internal regulation, while others use different arrangements. Matching the regulator type avoids unnecessary delays during installation and reduces the risk of buying the wrong alternator for the application.

This alternator is a new OEX unit, supplied with OEX quality controls and a warranty of 3 years for passenger use and 1 year for commercial use. That warranty should be read alongside the installation requirements, because correct fitment and proper system checks remain essential to getting the expected result from the replacement.

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 NXA603 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 86mm, Pivot Hole Diameter 13, Pulley Outside Diameter 81mm, Regulator Type Internal, Voltage 24, Mount Cnt to Cnt 220mm, Shaft Dimension 17.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. NXA603, Brand OEX, Description OEX Alternator 24V 40A Nikko, Adjusting Hole Diameter M10x1.25, Pin Code IR30, Power Rating (Amp) 40, Pulley Section BB, Suits Unit Make Nikko.

Compatibility note: Confirm fitment by matching part number NXA603, the 24V 40A rating, the twin leg mount layout, and the listed dimensions against the existing alternator and application details before ordering.

FAQ

What vehicle or equipment does this alternator suit?

It is listed as an OEX alternator 24V 40A Nikko, with fitment data also referencing a wide range of makes and models. The safest check is to match part number NXA603, the 24V system, the 40A output, and the mounting measurements to the unit being replaced.

Is this alternator new or remanufactured?

It is listed as new, not remanufactured.

What regulator type does it use?

It uses an internal regulator.

What are the key mounting measurements?

The listed mounting details are 220mm mount centre to centre, 86mm inside mounting legs, 13mm pivot hole diameter, and an M10x1.25 adjusting hole.

What pulley details should I check?

This alternator has a BB pulley section, an 81mm pulley outside diameter, and a 17mm shaft dimension. Those details should be compared with the existing unit before purchase.

What warranty is supplied with this alternator?

The warranty listed is 3 years for passenger use and 1 year for commercial use.