aerotech 29/40-120 delay o-ring material

[rbelknap]

I'm not sure how, but I've managed to lose the delay o-ring for my last 29/40-120 reload. (Well, not my LAST last, just the last one I have on hand.)

I figured it would be a simple matter to buy a replacement, since the dimensions are listed on the assembly instructions. I figured I'd throw some o-rings into a McMaster Carr order, but I'm realizing now that I have no idea what material the o-rings are supposed to be. Can anyone point me in the right direction material-wise?

 

[CarVac]

Buna-N (nitrile)

 

[rbelknap]

a little more research, and I think i may have answered my own question (Buna-N)

as confirmed by CarVac. Thanks!

 

[bill_s]

They look reusable enough to get another reload and recycle one from that.

 

[neond7]

They look reusable enough to get another reload and recycle one from that.

In the past year I've had two motor reload kits that were missing an o-ring. I was able to carefully remove a used one, clean it up, and give it a coating of SuperLube and refly it without problem. If it looks damaged in any way I wouldn't try it, though. But if it looks pristine, it should be ok.

 

[bobkrech]

They look reusable enough to get another reload and recycle one from that.

A delay o-ring in a 29 mm reload kit is worth $0.10. You rocket is worth several hundred times more. It's not a good idea to risk a rocket by reusing a $0.10 o-ring as the parts included in a reload kit are meant to be single use unless the directions say otherwise.

Bob

 

[rbelknap]

A delay o-ring in a 29 mm reload kit is worth $0.10. You rocket is worth several hundred times more. It's not a good idea to risk a rocket by reusing a $0.10 o-ring as the parts included in a reload kit are meant to be single use unless the directions say otherwise.

Bob

This.

I have no problem buying replacement o-rings, I just wanted to make sure I was getting the correct material.