ISO 28741 Metric Thread Dimensions for Spark Plugs

Reference table for metric thread dimensions for spark plugs according to ISO 28741 standard specifications.

Thread Pitch (mm)Major Diameter (mm)Minor Diameter (mm)Pitch Diameter (mm)Thread Depth (mm)
0.758.06.57.250.75
1.010.08.59.251.0
1.2512.010.011.01.25
1.514.011.512.751.5