Nikko Alternator 24V 50A NXA612

The Nikko NXA612 alternator is a new 24V, 50A unit built for rotating electrical applications where the mounting pattern and regulator details need to match exactly. It is supplied as an each unit, with a twin leg alternator mount, 200mm mount centre to centre, and 101mm inside mounting legs.

This alternator uses an internal regulator and is noted as having an R terminal with 28V output. Key dimensions include an M12 adjusting hole, 13mm pivot hole, 17mm shaft dimension, and an 85mm pulley outside diameter with AA pulley section.

It is listed under Nikko as the unit make and carries part number NXA612. The unit weight is 11kg, and the product is supplied new with no warranty stated. For anyone matching an existing alternator, the physical mounting points and electrical rating are the first details to confirm before ordering.

Key Features

• 24V alternator
• 50A power rating
• Internal regulator
• Twin leg mount
• AA pulley section
• R terminal with 28V output

Specifications

• Brand: Nikko
• Part No.: NXA612
• Product type: Alternator
• Voltage: 24V
• Power rating: 50A
• Regulator type: Internal
• Alternator mount: Twin leg
• Mount centre to centre: 200mm

Verified fitment references

• Kobelco SK850LC
• Kobelco SK850LC 2010
• Komatsu D155AX-5
• Komatsu D155AX-5 2007
• Komatsu D155AX-6
• Komatsu D275A-2
• Komatsu D275AX-5
• Komatsu D275AX-5 2007

Application and Buying Notes

Before buying, compare the part number NXA612 with the alternator already fitted to the machine. The listed fitment references include Kobelco SK850LC and several Komatsu models, but the safe way to confirm is to match the mounting layout, pulley details, and electrical rating against the original unit.

The important measurements here are the 200mm mount centre to centre, 101mm inside mounting legs, M12 adjusting hole, 13mm pivot hole, and 17mm shaft dimension. If any of those points differ on the existing setup, the alternator may not physically suit even if the machine family appears similar.

The 24V and 50A rating are the key electrical identifiers. The note that the R terminal is 28V output is also important when checking the charging system arrangement, especially where the machine uses a specific regulator or terminal configuration.

Because this is a new Nikko alternator and no warranty is stated, it is worth checking the old unit carefully before fitting. Confirm pulley section AA, pulley outside diameter of 85mm, and the twin leg mount arrangement so there are no surprises during installation.

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 NXA612 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 No Warranty, Inside Mounting Legs 101mm, Power Rating (Amp) 50, Pulley Section AA, Suits Unit Make Nikko, Note R Terminal = 28V Output, Mount Cnt to Cnt 200mm, Shaft Dimension 17.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. NXA612, Brand NIKKO, Description Nikko Alternator 24V 50A, Adjusting Hole Diameter M12, Pivot Hole Diameter 13, Pulley Outside Diameter 85mm, Regulator Type Internal, Voltage 24.

Nikko Alternator 24V 50A. Part number NXA612 should be checked first. Listed voltage is 24. Listed output rating is 50. 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 AA. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number NXA612, 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 24 and output 50 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using part number NXA612, the 24V 50A rating, and the mounting and pulley measurements before purchase. Listed applications are references only and should be checked against the original alternator and machine specifications.

FAQ

What is the part number for this alternator?

The part number is NXA612. For this listing, part number NXA612 is the main reference point. Listed voltage is 24. Listed output rating is 50. Published fitment references include KOBELCO SK850LC, KOBELCO SK850LC 2010, KOMATSU D155AX-5. These details should still be checked against the original unit before ordering.

What voltage and output does this alternator have?

It is a 24V alternator with a 50A power rating. For this listing, part number NXA612 is the main reference point. Listed voltage is 24. Listed output rating is 50. Published fitment references include KOBELCO SK850LC, KOBELCO SK850LC 2010, KOMATSU D155AX-5. These details should still be checked against the original unit before ordering.

Does this alternator have an internal regulator?

Yes. The regulator type is listed as internal. For this listing, part number NXA612 is the main reference point. Listed voltage is 24. Listed output rating is 50. Published fitment references include KOBELCO SK850LC, KOBELCO SK850LC 2010, KOMATSU D155AX-5. These details should still be checked against the original unit before ordering.

What mounting details are listed for this unit?

It has a twin leg alternator mount, 200mm mount centre to centre, and 101mm inside mounting legs. For this listing, part number NXA612 is the main reference point. Listed voltage is 24. Listed output rating is 50. Published fitment references include KOBELCO SK850LC, KOBELCO SK850LC 2010, KOMATSU D155AX-5. These details should still be checked against the original unit before ordering.

Which machine references are listed for fitment?

Verified fitment references include Kobelco SK850LC and several Komatsu models such as D155AX-5, D275AX-5, D31EX-21/PX-21, and D325-6. For this listing, part number NXA612 is the main reference point. Listed voltage is 24. Listed output rating is 50. Published fitment references include KOBELCO SK850LC, KOBELCO SK850LC 2010, KOMATSU D155AX-5. These details should still be checked against the original unit before ordering.

Is there a warranty stated for this alternator?

No warranty is stated for this unit. For this listing, part number NXA612 is the main reference point. Listed voltage is 24. Listed output rating is 50. Published fitment references include KOBELCO SK850LC, KOBELCO SK850LC 2010, KOMATSU D155AX-5. These details should still be checked against the original unit before ordering.