OEX Starter Motor 12V 11 Tooth CW Denso Style DXS521

The OEX Starter Motor DXS521 is a 12V, 11 tooth, clockwise-rotation starter motor built in a Denso style configuration. It is a new unit with a 2.5kW power rating, a 2 hole starter mount type, and a 90mm flange diameter, making it important to match the starter pattern and physical dimensions before ordering.

This unit measures 300mm overall length, has 113mm mount centres A, 13mm mount hole diameter, and a 40mm pinion diameter. The pinion at rest is 15mm, and the starter is specified for dry clutch applications, so the listed setup should be checked carefully against the existing unit and application details.

OEX states its products are sourced from market leading original equipment manufacturers and aftermarket suppliers, made in ISO certified factories, and supported by a nationwide warranty. For this starter motor, the published warranty is 3 years for passenger use and 1 year for commercial use, which gives a clear reference point when comparing replacement options.

Key Features

• 12V starter motor
• 11 tooth pinion
• Clockwise rotation
• Denso style unit
• 2 hole starter mount
• 2.5kW power rating

Specifications

• Brand: OEX
• Part number: DXS521
• Product type: Starter Motor
• Voltage: 12V
• Rotation: CW
• Number of teeth: 11
• Power rating: 2.5kW
• Suits unit make: Denso

Verified Fitment Applications

• Komatsu FD25
• Komatsu FD25 1993
• Toyota Industrial 42-7FD25
• Toyota Industrial 42-7FD25 2002
• Toyota Industrial 4SDK10
• Toyota Industrial 4SDK10 1997
• Toyota Industrial 4SDK10 1998
• Toyota Industrial 4SDK10 1999

Application and Buying Notes

Before buying, check that the existing starter matches the key identifiers on this unit: DXS521, 12V, 11 tooth, clockwise rotation, and Denso style. The physical details matter just as much as the electrical rating, especially the 2 hole mount, 113mm mount centres A, 90mm flange diameter, and 300mm overall length.

The published fitment covers a range of Komatsu and Toyota Industrial applications, including Komatsu FD25 and Toyota Industrial 4SDK10 across several model years. Even where the model family is listed, the starter should still be matched against the vehicle or machine already fitted, because starter housings, mount patterns, and pinion engagement can vary within similar applications.

If you are replacing a worn unit, comparing the old starter’s tooth count, mounting pattern, and pinion position can help avoid delays. The 40mm pinion diameter, 15mm pinion at rest, and dry clutch specification are all useful checkpoints when confirming that the replacement is the same style and configuration as the unit being removed.

For commercial equipment, the warranty is listed as 1 year, while passenger use is listed as 3 years. That does not replace the need for correct fitment, but it does give a clear warranty reference when the starter is being selected for the intended application and service environment.

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 DXS521 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 3yr Passenger 1yr Commercial, Mount Centres A 113mm, Number of Teeth 11, Pinion at Rest 15mm, Power Rating 2.5kW, Suits Unit Make Denso, New / Reman. New, Wet / Dry Clutch Dry.

Additional published details for cross-checking include Product Group 2 STARTER MOTORS, Part No. DXS521, Brand OEX, Description OEX Starter Motor 12V 11Th CW Denso Style, Flange Diameter 90mm, Mount Hole Diameter 13, Overall Length 300mm, Pinion Diameter 40mm, Rotation CW.

OEX Starter Motor 12V 11Th CW Denso Style. Part number DXS521 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 DXS521, 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.

Available application references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25, TOYOTA INDUSTRIAL 42-7FD25 2002, TOYOTA INDUSTRIAL 4SDK10, TOYOTA INDUSTRIAL 4SDK10 1997. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

Compatibility note: Confirm fitment using the part number DXS521, the 12V clockwise Denso style configuration, and the listed mounting and pinion dimensions before ordering. The application list is provided as a guide only, so the existing starter and machine details should be checked to make sure the replacement matches the original unit.

FAQ

What is the part number for this starter motor?

The listed part number is DXS521. For this listing, part number DXS521 is the main reference point. Listed voltage is 12. Published fitment references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25. These details should still be checked against the original unit before ordering.

Is this starter motor 12V?

Yes. The voltage is listed as 12V. For this listing, part number DXS521 is the main reference point. Listed voltage is 12. Published fitment references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25. These details should still be checked against the original unit before ordering.

What rotation does this starter have?

This starter motor is clockwise rotation, shown as CW. For this listing, part number DXS521 is the main reference point. Listed voltage is 12. Published fitment references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25. These details should still be checked against the original unit before ordering.

What type of unit is it suitable for?

It is listed as suitable for Denso units and described as a Denso style starter motor. For this listing, part number DXS521 is the main reference point. Listed voltage is 12. Published fitment references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25. These details should still be checked against the original unit before ordering.

What are the main mounting details?

The starter has a 2 hole mount type, 113mm mount centres A, a 90mm flange diameter, and 13mm mount hole diameter. For this listing, part number DXS521 is the main reference point. Listed voltage is 12. Published fitment references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25. These details should still be checked against the original unit before ordering.

Which applications are listed for this starter motor?

Verified applications include Komatsu FD25, Komatsu FD25 1993, and multiple Toyota Industrial models such as 42-7FD25, 4SDK10, 4SDK5, 4SDK8, 5SDK10, 5SDK11, 5SDK8, 5SDK9, 72-8FD25, 72-8FDJ35, Forklift, SD20, SD7, SDK6, SDT12, SDT15, and TD20. For this listing, part number DXS521 is the main reference point. Listed voltage is 12. Published fitment references include KOMATSU FD25, KOMATSU FD25 1993, TOYOTA INDUSTRIAL 42-7FD25. These details should still be checked against the original unit before ordering.