S400 Pressure Gauge O ring Sizes

[lensman57]

Can someone please tell me the exact sizes of the S400 Pressure gauge O rings ? One is stated as S536 and another as S427 . I need to know their exact sizes for a late S400 ( 2014 model ) . Mine seems to have disintegrated for some reason and is not measurable.

Many thanks,

A.G

[UrbanFox]

I have the S536 as 4.5 x 1.5 NBR 70 which is also the .177 barrel seal.
S427 at 6 x 1 same as TP seal but I find the TP seal is better at 6 x 1.5 which stops blow out on some rifles.

Hope that helps.

Bri

[bezzer]

I have the S536 as 4.5 x 1.5 NBR 70 which is also the .177 barrel seal.
S427 at 6 x 1 same as TP seal but I find the TP seal is better at 6 x 1.5 which stops blow out on some rifles.

Hope that helps.

Bri

Spot on, but I've never had a problem with the 6X1

[Archer50]

I find the TP seal is better at 6 x 1.5 which stops blow out on some rifles. Bri

Definitely - good on my S400, almost essential on my HFT 500.

Alan

[lensman57]

Thank you gentlemen for your assistance. May I ask if the one that seals the body of the pressure gauge to the action is S 427 or the other way around please?

A.G

[UrbanFox]

S427 seals the Gauge mount to the Firing Valve body and is also used to seal the Transfer Port to the bolt housing. As said above some seals that are 6 x 1 and used on the TP will blow out and you think you forgot to replace it on reassembly!!! My 400 needs the 6 x 1.5 seal RN 219 -9 seals the guage to the Gauge mount.
Heres a pdf file for the parts but doesn't give sizes.
https://www.milidonis.gr/images/part...-arms-iss2.pdf

Bri

[ChrisC]

S427 seals the Gauge mount to the Firing Valve body and is also used to seal the Transfer Port to the bolt housing. As said above some seals that are 6 x 1 and used on the TP will blow out and you think you forgot to replace it on reassembly!!! My 400 needs the 6 x 1.5 seal RN 219 -9 seals the guage to the Gauge mount.
Heres a pdf file for the parts but doesn't give sizes.
https://www.milidonis.gr/images/part...-arms-iss2.pdf

Bri

Good advice with the 6x1.5.... along time ago UKneil made me some brass shims that sat in the TP recess to stop the blowout.