Invicta 8926 crystal dimensions?

[jj69]

Does anyone know the correct dimensions of the crystal on the Invicta 8926?

I was going to try to remove the cyclops from mine, but now I'm thinking that it makes more sense to just put a proper sapphire crystal in it from the outset.

In fact, can anyone suggest a source for an inexpensive flat sapphire crystal with NO AR coating or cyclops? Frei sells 2.5mm crystals for $22 + ship, so I assume someone out there should be even cheaper. It's a cheap watch, so I want an appropriate cheap solution. :)

[lysanderxiii]

Take out the old one and measure it. In both diameter and thickness.

Jules Borel, Otto Frei and Cousins all sell flat mineral crystals.

[jj69]

Thanks, but I was hoping to have the replacement crystal in hand before removing the original.

Also, my goal is to upgrade the crystal to sapphire, so I'm not interested in mineral glass.

I realize the larger materials houses all have them, but I have to assume they're available for much less, considering that most of these are sourced from China.

Take out the old one and measure it. In both diameter and thickness.

Jules Borel, Otto Frei and Cousins all sell flat mineral crystals.

[lysanderxiii]

Thanks, but I was hoping to have the replacement crystal in hand before removing the original.

Also, my goal is to upgrade the crystal to sapphire, so I'm not interested in mineral glass.

I realize the larger materials houses all have them, but I have to assume they're available for much less, considering that most of these are sourced from China.

Well, the sapphire crystal will be the exact same size as the mineral crystal...

And, unless someone around here has replaced one for that particular model, measuring the old one is the only way to ensure a correct fit.

[jj69]

I hear ya. I just assumed that since it's such a common watch, someone must have installed a sapphire crystal already.

And, unless someone around here has replaced one for that particular model, measuring the old one is the only way to ensure a correct fit.

[beyondx4]

Does anyone know the correct dimensions of the crystal on the Invicta 8926?

I was going to try to remove the cyclops from mine, but now I'm thinking that it makes more sense to just put a proper sapphire crystal in it from the outset.

In fact, can anyone suggest a source for an inexpensive flat sapphire crystal with NO AR coating or cyclops? Frei sells 2.5mm crystals for $22 + ship, so I assume someone out there should be even cheaper. It's a cheap watch, so I want an appropriate cheap solution. :)

If you got the proper tools and know-how, I don't see what's the problem with removing the crystal and measuring it with a caliper. It's good practice before you have to actually install the good stuff. Anyway, here's what you'll need for the Invicta 8926 or similar Pro Diver models:

A 30.5mm (diameter) x 2.0mm (thickness) flat sapphire crystal. The direct replacement crystal for Subs are 29.5mm, so those won't work. A 2.0mm high gasket can be used or you can just mount with epoxy like I did. If you're gonna use a gasket, get the seller's opinion on size adjustments to compensate for it (maybe a 30.4mm + gasket). This will depend on ihe gasket's thickness.

A seller that's specializes on watch crystals I would recommend is Krysworks, Inc. Google their website. Their prices are pretty much on par with most other suppliers, but they offer a little more variety and they only deal with crystals. Don't expect things to be any cheaper, otherwise, just keep what ya got on that watch and forget about going sapphire.

[jj69]

A 30.5mm (diameter) x 2.0mm (thickness) flat sapphire crystal. The direct replacement crystal for Subs are 29.5mm, so those won't work. A 2.0mm high gasket can be used or you can just mount with epoxy like I did. If you're gonna use a gasket, get the seller's opinion on size adjustments to compensate for it (maybe a 30.4mm + gasket). This will depend on ihe gasket's thickness.

THANK YOU for the info and especially for the referral! I need to have a professional swap the crystal, as I don't have the tools or the know-how.

One follow-up question. I'm a bit confused about the gasket. Is the stock crystal installed with a gasket, and if so, why would I need to downsize for the replacement? If not, is there some advantage to mounting with a gasket?

[beyondx4]

THANK YOU for the info and especially for the referral! I need to have a professional swap the crystal, as I don't have the tools or the know-how.

One follow-up question. I'm a bit confused about the gasket. Is the stock crystal installed with a gasket, and if so, why would I need to downsize for the replacement? If not, is there some advantage to mounting with a gasket?

The reason why I had to replace mine was because the stock crystal cracked. So I wasn't able to measure its exact dimensions, but had to remove the bezel and measure at the opening. The stock mineral crystal is thinner and has a gasket that is relatively thick but also high, raising the crystal up a bit to make it flush with the bezel. It is not a strong crystal because it cracked pretty easily with a light accidental tap on the faucet while I was washing my hands.

Now, the replacement sapphire crystal has quite a bit more meat. Its dimension is a little different, so the stock gasket won't fit. You'll need to purchase a gasket from the supplier made for that crystal to ensure the walls are fully sealed to make it waterproof. If you plan to have the watchsmith install the glass, then he may choose to use a 2-part clear epoxy to seat and seal it (you'll need to discuss this with him first before purchasing anything)...or he may choose to use a gasket. Its thickness could add up to 0.10mm to 0.20mm, which may require you to decrease the size of your crystal a bit to make it fit (you'll need to verify this with the supplier).

[digivandig]

Thread Revival!!!!!

Was wondering if you guys can provide a little help. First, the 30.5mm (diameter) x 2.0mm (thickness) replacement sapphire crystal. Did that apply to the 8926s with the Miyota movement or the newer version with the NH25A/NH35A movement, or is there absolutely no difference in terms of case and crystal size? If there is a difference, does anyone know the new size? I've got my crystal out but no calipers, so if I need to measure, I'd be willing to send my crystal and an SASE to someone with calipers that would be willing to do me a solid.

Second, I would l like to replace my stock crystal with a hi-dome plastic crystal. Is it correct that plastic crystals should be installed using glue as opposed to gaskets? If so, what glue do you recommend. Also, if I install with glue, should I use a slightly smaller diameter crystal like a 30.4mm or 30.3mm? Will a plastic crystal installed with glue be waterproof?

Third, if I can use a gasket with the plastic crystal (or if I decide to use a domed mineral or sapphire crystal and need to use a gasket), can I re-use my old one, and if so, do I have to peel it out of the case first? See pic below. Thanks in advance for your help.

There is no way I'll be able to remove the gasket from the case intact.



My version of calipers sucks.



Shaved!

[beyondx4]

I won't be able to tell you for sure whether there are physical differences between the old version of the 8926 w/ the Miyota and the new one because I've only owned the older ones, but I doubt if there's any changes. You can remove the old gasket on the watch case, but you'll need to heat it up to soften it a little bit and carefully pry it out. The thing about using a plastic crystal is that you will not need a gasket, which means there is more room to work with. So any crystal between the sizes 30.3mm-30.5mm should attach using GS Hypo-Cement (go to Jules Borel to buy all your materials). Yes, if applied correctly it should be water resistant, though I doubt it could reach the 200m depth of the glass/gasket combo. If you feel like wanting to have your crystal checked out thoroughly to have the exact crystal dimensions, just PM me. -Dennis