Remington 11-87 O Ring material and hardness ?

[FatCatsDad]

Looking at all the different types of materials for size 021 O Rings for a 12 gauge 1187

EDPM, BUNA, Silicone, Viton for example and several different hardness 50, 70 and 90 Durometer

Finding the size for replacement was easy, but what material and hardness is the same or better than factory parts ?

 

[FLHTCUI]

I went to a hydraulics shop with a sample of my 1100 O-ring .
The guy gave me 10 for about $7.00...the conversation of hardness never came up.
Now you have me paranoid I am going to miss the next grouse that busts cover and goes for my throat.
Actually, I am curious to see how this conversation goes and what others have found.
Rob

 

[BigBraz15]

I worked with orings in industry, and my answer below comes from that:

Honestly the material and durometer are more a function of chemical resistance. For the purpose of sealing gasses I would say you are best off with a soft to middle of the road sort of thing.

 

[rembolt]

The OEM orings are a #21 viton ring .not much else one needs to know .

 

[SuperCub]

I went to a hydraulics shop with a sample of my 1100 O-ring .

I did the same thing looking for O-rings for a 760 forend. They had every size imaginable.

I lube mine with lithium grease.

 

[FatCatsDad]

The OEM orings are a #21 viton ring .not much else one needs to know .

The 021 Viton is available in different Durometer ratings, so if it's available in different hardness, then I'd imagine 1 is better to use than the other and more closely resembles the factory part .

 

[FatCatsDad]

I did the same thing looking for O-rings for a 760 forend. They had every size imaginable.

I lube mine with lithium grease.

Factory replacements are coated in Graphite , which is a dry lube not sticky like grease.

 

[FatCatsDad]

I worked with orings in industry, and my answer below comes from that:

Honestly the material and durometer are more a function of chemical resistance. For the purpose of sealing gasses I would say you are best off with a soft to middle of the road sort of thing.

Sounds like fair advice.
I'll try 021 Viton in 70 Durometer

 

[3macs1]

Sounds like fair advice.
I'll try 021 Viton in 70 Durometer

They are like rembolt says with a 75A durometer

 

[FLHTCUI]

They are like rembolt says with a 75A durometer

So, in other words they are between a soft and a medium soft material.
I personally carry a spare or two with me, but I rarely shoot more than 50 rounds a season of hunting grouse.
Comp. level I would likely run the oem factory from the former OEM Remington ...
Lots of fun info in this thread.
Sounds simple but , yet complex all at the same time.
Rob

 

[FatCatsDad]

They are like rembolt says with a 75A durometer

The ones readily available to me are 50, 70 and 90.
I chose 70, ordered and then found these in my garage.