"510 Thread" has been used to describe all sorts of vape pen parts, whether they are threaded or not. It's a non technical term created by an original e-cig factory (Joyetech) to describe the battery to tank connection they were using. While it was considered proprietary at the time, this (and most other e-cig innovations) are passed around freely between manufacturers. Most pens today are all based on this 510 thread.
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Some common misconceptions are:
- That it's 5mm diameter. It's actually 7.
- That it denotes the 5 thin grooves on the outside of the battery (see picture below). We don't believe so.
- That it denotes the number of times the piece will survive before wearing out. (humor)
510 literally means 10 threads at 0.5 mm per thread. The diameter is 7mm. If you were to create this thread yourself, it would use an M7 x 0.5 tap. Thank you to designer Don Salerno for correcting us on the proper way to describe the thread.
If you look at our battery, there are two threads, an outer one and an inner one. The outer one is not used. The 510 thread is on the inside.
This image was found on reddit.
More 510 discussion from reddit here.