thin o-ring for Trustfire F20 (K106 clone) tailcap

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Last seen: 7 years 4 months ago
Joined: 06/19/2011 - 22:49
Posts: 337
thin o-ring for Trustfire F20 (K106 clone) tailcap

does anyone know where to get 1mm thickness, 16-18mm diameter o-rings?  

i'm looking for spare o-rings for the tailcap of my Trustfire F20.  the o-ring that came with it seems to be 1mm thick.  i've tried the 1.5mm o-rings i have and they are too thick for the groove.  

i assume K106 and all its clones must use the same o-rings, right?

i appreciate any feedback.


Last seen: 5 years 4 months ago
Joined: 12/26/2010 - 20:45
Posts: 52
Location: Palo Alto, CA

Based on your description, I think you will be fortunate to locate the correct o ring. When I found someone who had the right o ring the shipping charge and/or min order qty made purchase very expensive. There is someone at CPF who is trying to act as an intermediary. He is offering kits of o rings which unfortunately are too thick (SAE sizing) - I think. He looks like he might try to do the same thing for the metric o ring sizes. Here is the thread:



E1320's picture
Last seen: 2 years 2 months ago
Joined: 03/30/2011 - 05:26
Posts: 3369
Location: New Hampshire

Try Shiningbeam, maybe.

I am already visualizing the duct tape over your mouth.

Last seen: 4 months 3 weeks ago
Joined: 05/07/2010 - 20:42
Posts: 2541
Location: Seattle,WA

ACE is a good suggestion. I've been there before and even the smallest Mom and Pop locations have imperial and metric o-rings. It's a bit hit and miss of course but they are usually easy to get to before you have to try sizing o-rings online.

DX has o-rings. When I've had orders I've throw in a few random bags of o-rings just because they are such a pain to locate when you need one. I also ordered a SAE kit (imperial I think) and most are way too big and thick (think auto) but it wasn' t too expensive and it comes in handy sometimes.

It's not good for most small o-rings for flashlights however.