Bujie standard NGK BR7EF.
Technical specifications:
- thread diameter: 14mm
- thread pitch: 1.25mm
- with resistor: yes
- resistor value: 5K Ohm
- thread length (including unthreaded part): 18mm
- hex diameter: 16mm
- terminal type: solid
- electrode gap: 0.7mm
- heat range: 7
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