Bosch Starter Motor 12V 9 Tooth CW 0001125521

This Bosch starter motor is a 12V unit with 9 teeth, clockwise rotation and part number 0001125521. It is a new starter motor, supplied each, with a one year warranty and manufactured in Hungary. The key identifying details are the 76mm flange diameter, 104mm mount centres A, and 2-hole starter mount type.

For buyers matching a replacement starter, the important checks here are the 12V system voltage, CW rotation, 9-tooth pinion, 28mm pinion diameter and the 2 mounting bores with a 62 degree mounting hole angle measurement. The unit is listed with a 10.5 bore O2 and a single threaded bore, so the mounting pattern should be compared carefully against the existing starter before purchase.

Bosch lists this starter as designed in fit and performance to meet OE starters, with premium starting performance and construction intended to withstand harsh environments. It is described as a floating pinion starter and is suited to Bosch units, which makes the part number 0001125521 the most reliable reference when checking suitability.

Because starter motors are not a universal fit item, the safest approach is to confirm the physical mounting points, rotation, tooth count and electrical requirement from the vehicle or removed unit. If the old starter is available, compare the mount centres, flange diameter, pinion diameter and bore measurements before ordering.

Key Features

• Bosch starter motor, new unit
• 12V, 9 tooth, clockwise rotation
• Part number 0001125521
• 2-hole starter mount type
• Floating pinion design
• One year warranty

Specifications

• Brand: Bosch
• Product type: Starter motor
• Part number: 0001125521
• Voltage: 12V
• Number of teeth: 9
• Rotation: CW
• Starter mount type: 2 hole
• Number of mounting bores: 2

Application and Buying Notes

The most important purchase check is whether your original starter matches Bosch part number 0001125521. If the part number is not visible, compare the physical details: 12V voltage, 9 teeth, clockwise rotation, 76mm flange diameter and 104mm mount centres A. Those details give a practical way to narrow down compatibility without guessing.

Mounting dimensions matter just as much as electrical specification on starter motors. This unit uses a 2-hole mount, 2 mounting bores, 11mm mount hole diameter and a 62 degree mounting hole angle measurement. If the mounting face on the vehicle or the removed starter differs from these measurements, it should be treated as a mismatch until confirmed.

The pinion and drive style also need to line up. This starter has a 28mm pinion diameter, a floating pinion design and a dry clutch arrangement. Those are useful identifiers when comparing with the old unit, especially where there are similar-looking Bosch starters with different mounting or drive details.

When checking suitability, keep to the visible identifiers and do not rely on appearance alone. The safest buying process is to match the part number, then confirm the physical measurements and rotation direction. If you are working from a worn or incomplete old starter, take extra care with the flange diameter, bore measurements and tooth count before finalising the order.

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 0001125521 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 STARTER MOTOR, Unit of Measure EACH, Warranty One Year, Mount Centres A 104mm, Number of Teeth 9, Rotation CW, Voltage 12, Starter Mount Type 2 Hole, Position / Degree rechts, Bore O 2 10.5.

Additional published details for cross-checking include Number of mounting bores 2, Packaging length 28.8, Packaging height 12, Mounting hole angle measurement [Degree] 62, Product Group 2 STARTER MOTORS, Part No. 0001125521, Brand BOSCH, Description Bosch Starter Motor 12V 9Th CW, Flange Diameter 76mm.

Bosch Starter Motor 12V 9Th CW. Part number 0001125521 should be checked first. Listed voltage is 12. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 0001125521, 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 starter motor in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Where no verified application list is available, the part number, mounting details, connector style, and published specifications should be used as the primary selection criteria.

Compatibility note: Confirm fitment by comparing Bosch part number 0001125521 with the original starter, along with the 12V rating, 9-tooth CW rotation, 2-hole mounting pattern and the listed measurements before purchase.

FAQ

What is the part number for this starter motor?

The Bosch part number is 0001125521. For this listing, part number 0001125521 is the main reference point. Listed voltage is 12. These details should still be checked against the original unit before ordering.

Is this a 12V starter motor?

Yes. The listed voltage is 12V. For this listing, part number 0001125521 is the main reference point. Listed voltage is 12. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

It has 9 teeth. For this listing, part number 0001125521 is the main reference point. Listed voltage is 12. These details should still be checked against the original unit before ordering.

What rotation does this starter use?

It is clockwise rotation, listed as CW. For this listing, part number 0001125521 is the main reference point. Listed voltage is 12. These details should still be checked against the original unit before ordering.

Is this a new or remanufactured starter?

It is listed as new. For this listing, part number 0001125521 is the main reference point. Listed voltage is 12. These details should still be checked against the original unit before ordering.

What should I check before ordering?

Confirm the part number 0001125521, then match the 12V rating, 9 teeth, CW rotation, 2-hole mount, 104mm mount centres A and 76mm flange diameter against the existing starter. For this listing, part number 0001125521 is the main reference point. Listed voltage is 12. These details should still be checked against the original unit before ordering.