# Bosch 4003

> All equivalents for the Bosch 4003 spark plug: compatible references, technical specifications and where to buy.

## Technical information

- **Thread:** 14 mm
- **Reach:** 18.5–21.5 mm
- **Heat range:** Medium
- **Resistor:** yes
- **Seat:** Flat (gasket)
- **Torque:** fonte 25–35 N·m · alu 25–30 N·m — ou 180°–240° (½–⅔ tour)

## 9 equivalents

- [Bosch FR8HP4](https://www.thesparktwin.com/en/bosch/fr8hp4/)
- [Autolite AP985](https://www.thesparktwin.com/en/autolite/ap985/)
- [Motorcraft SP-428](https://www.thesparktwin.com/en/motorcraft/sp-428/)
- [Splitfire PP098E](https://www.thesparktwin.com/en/splitfire/pp098e/)
- [Bluelightning BLP554](https://www.thesparktwin.com/en/bluelightning/blp554/)
- [Bosch 4103](https://www.thesparktwin.com/en/bosch/4103/)
- [Bosch 4203](https://www.thesparktwin.com/en/bosch/4203/)
- [Bosch 6242](https://www.thesparktwin.com/en/bosch/6242/)
- [Champion 3405](https://www.thesparktwin.com/en/champion/3405/)

---
*Source : [Bosch 4003](https://www.thesparktwin.com/en/bosch/4003/) — TheSparkTwin*