Bosch Alternator 12V 110A BXH1257N

Bosch alternator, 12V and 110A, part number BXH1257N, supplied as a new unit for rotating electrical applications. It is listed as an alternator with internal regulator, twin leg mount, and 6 groove pulley, so it is important to match those details to the vehicle application before ordering.

Key measurements include 82mm inside mounting legs, M8 x 1.25 adjusting hole diameter, and a 61mm pulley outside diameter. Rotation is clockwise (CW), and the unit is supplied as each. Those points matter when checking physical fitment, bracket alignment, and belt compatibility.

This alternator is identified with Bosch as the brand and suits unit make Bosch. The listed application data includes Nissan 350Z and Nissan Maxima references, but fitment should still be confirmed against the part number BXH1257N and the exact mounting and pulley details on the vehicle.

The unit is backed by a one year warranty and is described as being made from high quality raw materials, corrosion resistant, and fitted with a reduction drive. For a parts buyer, the practical checks remain voltage, amperage, pulley section, rotation, and mounting style before installation.

Key Features

• 12V alternator with 110A output
• Internal regulator
• Twin leg alternator mount
• 6 groove pulley
• Clockwise rotation
• New unit, supplied each

Specifications

• Brand: Bosch
• Part number: BXH1257N
• Product type: Alternator
• Voltage: 12
• Power rating: 110A
• Rotation: CW
• Pulley section: 6 groove
• Pulley outside diameter: 61mm

Fitment guidance

• Listed application references include Nissan 350Z and Nissan Maxima
• Sample application data includes Nissan 350Z 2003, 2004, 2005, 2006, 2007, 2008 and 2009
• Application data also includes Nissan Maxima 2003, 2004 and 2005
• Fitment should be confirmed against part number BXH1257N and the stated mounting and pulley measurements before purchase

Application and Buying Notes

When checking this alternator, start with the part number BXH1257N, then compare the mounting style and dimensions: twin leg mount, 82mm inside mounting legs, and M8 x 1.25 adjusting hole diameter. Those details are the best match points when swapping a charging unit, because the wrong bracket spacing or adjuster size can stop the alternator from lining up correctly.

The electrical rating is 12V and 110A, so it should be matched to the vehicle’s charging system requirements. The internal regulator is another important detail, because regulator type needs to align with the vehicle’s setup. If the vehicle uses a different arrangement, the alternator may not be suitable even if the mounting looks close.

Pulley details also need attention. This unit has a 61mm pulley outside diameter, a 6 groove pulley section, and clockwise rotation. Belt alignment and belt type must suit those particulars. If the vehicle uses a different groove count, pulley diameter, or rotation direction, it is wise to stop and verify before fitting.

The application references point to Nissan 350Z and Nissan Maxima variants, including model-year references in the supplied data. That is useful as a guide, but it is not a substitute for checking the vehicle’s existing alternator or confirming against the VIN, bracket layout, and belt drive arrangement. A visual match on the old unit is not enough on its own if the mounting or pulley differs.

For buyers replacing a charging component, the safest approach is to compare the old alternator side by side with the listed specifications: Bosch brand, BXH1257N, 12V, 110A, internal regulator, twin leg mount, and 6 groove pulley. That reduces the chance of receiving a unit that is electrically correct but physically incompatible.

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 BXH1257N 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 One Year, Inside Mounting Legs 82mm, Pulley Outside Diameter 61mm, Regulator Type Internal, Suits Unit Make Bosch, Alternator Mount Twin Leg, Product Group 2 ALTERNATORS.

Additional published details for cross-checking include Part No. BXH1257N, Brand BOSCH, Description Bosch Alternator 12V 110A, Adjusting Hole Diameter M8x 1.25, Power Rating (Amp) 110, Pulley Section 6 Groove, Rotation CW, Voltage 12, New / Reman. New, Product Group 1 ROTATING ELECTRICAL.

Bosch Alternator 12V 110A. Part number BXH1257N should be checked first. Listed voltage is 12. Listed output rating is 110. 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 BXH1257N, 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 110 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using the part number BXH1257N, the listed Bosch application data, and the mounting, pulley, voltage, amperage, and rotation details before purchase.

FAQ

What is the part number for this Bosch alternator?

The part number listed is BXH1257N.

What voltage and amperage does this alternator have?

It is a 12V alternator with a 110A power rating.

Is the regulator internal or external?

The regulator type is internal.

What are the mounting and pulley details?

It has a twin leg mount, 82mm inside mounting legs, a 61mm pulley outside diameter, and a 6 groove pulley section.

Which way does it rotate?

Rotation is clockwise (CW).

What vehicles are referenced in the fitment data?

The supplied application references include Nissan 350Z and Nissan Maxima, with sample year listings shown for 350Z 2003 to 2009 and Maxima 2003 to 2005.