triton
Involved Member
Building a Southern Railway 5" Schools Loco
Posts: 55
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Post by triton on Nov 25, 2024 16:40:45 GMT
My drawing for a Tender Axle Pump calls for a Nitrile O-ring #HS-104-90. The "90" is the hardness number of the O-ring, and the 104 is the size?. This doesn't seem to fit or match the valve stem of the pump which has a diameter of 0.0753". Can anyone help with the O-ring dimensions? I am also having trouble finding a supplier for these mini rings - help!!!
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jasonb
Elder Statesman
Posts: 1,239
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Post by jasonb on Nov 25, 2024 18:46:00 GMT
Are you sure you have the right number as a BS104 is 3/32 nominal section (0.103 thou actual) and has a bore of 0.112 thou Might get away with a 103 which has an bore of 0.081 thou. depending on how much you ar ecompressing it. A BS 004 would be more likely, this is 1/16 nominal section which is actually 0.070 thou and also has a bore of 0.070 thou what size hole does it go into? Good chart of sizes www.allorings.com/British-o-ring-Size-Chart |
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Post by brucevoelkerding on Nov 25, 2024 19:38:17 GMT
is the O-Ring used on the Valve(s) or on the Plunger (Piston) ?
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