Hi,good morning every one.
Days ago,we try to use a flat front O rings for M8 series,as shown below:
The flat rings have more bigger press surface than the noraml ones, so the galss should be more safe. We have use it for our all M8 series.
Hello Jaxman!
I’m very pleased to read news about a specific detail of a flashlight. I have never thought of a flat o-ring before. Thank you for sharing.
If it’s round it’s an o-ring, if it’s flat it’s a gasket
Very good idea.
That should decrease the chances of it popping out under pressure too. Glad to see you actually think about improving your products.
It’s not a o-ring, it’s a 
-ring
right,dear. It is really a gasket……
In general speaking maybe the part in the bottom of reflector or on the LED is gasket….
the glass related parts must be called O rings, no matter it is flat ,or ring…. or we call it in Chinese,
硅橡胶密封圈， and the gasket,we call it 居中垫片。。
There is big languages difference and hard ……
I’d say it is the low E-modulus (stiffness) of the material, equal to that of a traditional o-ring, that determines how it is used, hence it still is an o-ring. A gasket has a much higher E-modulus.
I like the M8 “mini C8” model.
Maybe you can sell 18350 battery tube for it?
Except when it’s a rubber or silicone gasket…?
Aren’t those suckers made from a much stiffer material? I’m not sure anymore…
Yep, and describing technical features and assembly / disassembly instructions are always the hardest thing to learn. Saying stuff like “Insert it into the groove and give it a half-turn”, “Snap it on”, “Slide it to one side”, “Pull it up to the top” are usually highly idiomatic expressions that don’t translate literally from one language to another.
I remember with the Thrunite TN32 that the shiny ring was supposed to be solid (same piece as the shelf) copper (chromed). This was done due to higher thermal conductivity of copper compared to aluminium. It turned out to be brass, and not copper, with brass having a similar thermal conductivity as aluminium. Someone said that there is no difference between copper and brass in Chinese language, resulting in this case… Wonder if this is true…
I’m not sure either, but i think an O-ring is always round.
Just like a D-shaft is always D shaped.
It’s not that important, we all know what we mean when we say “flat O-ring”.
I doubt it…
On the other hand, in Dutch you can say yellow copper (geel koper) for brass and red copper (rood koper) for actual copper.
But i’m sure the Chinese can distinguish between brass and copper too.
Yep I’ve heard that too, on quite a few occasions, don’t know if they have separate words to describe copper and brass, but it seems the norm for the Chinese to refer to brass as copper in their descriptions.
Was a thread about it on here a while back, referring to the copper i3s, - iirc - that was not copper but brass, but the Chinese insisted it was copper and sold it as a (CU) copper bodied torch
The problem started when manufacturers started using o-rings as gaskets. The application in the head of the light between the lens and front surface of the head is that of a gasket. It’s the application not the material, a gasket can be made of anything, some things work better than others in different applications. Some are even made of metal. The proper technical application /operation of each is different in mechanical engineering.
Nice to see the flat gasket being used. Even nicer would be an U-shaped gasket that wraps around the glass, as some manufacturers use (Olight).
Btw, Jaxman, I received a Mini-C8 a while ago that had a (white-coloured) led center piece that did not fit very well and was glued in place. Do you sell spare centering pieces, preferably the new black one?
Ah this makes so much more sense 
And it’s probably the application then that results in o-rings in general having a material with lower E-modulus…