O-ring chamfer seat dimensions?
Anyone know where I can find recommended dimensions for O-ring chamfer seats? My Machinery's Handbook only gives sizes for square grooves.
This is for a follow-up to my Oil Filter query. I've eventually found a filter which is 10mm shorter than the original. The original was screwed into a cage so didn't need sealing at the bottom, whereas the new one is a conventional paper cartridge. I plan to make a pair of seating/packing washers for the bottom, with a chamfer groove between for an O-ring to seal onto the central bolt.
The thread on the central bolt (nominal 1/2") is slightly bigger than the shank, so I can't make something up with a close-fitting flat neoprene washer as is commonly done.
Yes I can play about until it 'looks right', but I haven't got the O-ring yet!
hmmm, I have never used anything but a square cut groove when making anything that requires an O-ring. The square cut groove has always sealed perfectly.
I have only paid attention to deburr the grooves so as leaving nothing that might cut the 0-ring.
The chamfer groove allows parts to be assembled loose, then the chamfer tightens the ring onto the shaft, for static applications.
Originally Posted by S_J_H
This thing is deep down in the bottom of the filter can, where it can't easily be reached. I need to be able to drop the components down the central bolt one at a time and know that the spring pressure when assembled will push the ring against the bolt.
Take a look in the Parker O-Ring Handbook page 4-21. Should be all the info you need.
parker.com/literature/ORD 5700 Parker_O-Ring_Handbook.pdf
Originally Posted by mbensema
Thanks for that. The link didn't work for me but I found an equivalent document by digging around on their site.
I didn't have the filter bowl & central bolt here when I asked the question, went to where the boat & engine are yesterday to fetch it & check dimensions. In fact although the thread is a bit bigger than the shank on the bolt the discrepancy is less than I thought, so I've been able to adopt the simpler solution of a tight-fitting neoprene washer between two flat plates.