I'm rebuilding the hydraulics for a 1950's Takara Belmont barber chair. There are two o-rings that need replacing (only one is present). How would I go about determining the sizes? The one that is existing is loose - I suppose I can use a micrometer to determine the diameter?
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O-ring sizes
- Thread starter 1mikeg
- Start date
https://www.marcorubber.com/o-ring-groove-design-dynamic-piston.htm
On the above link they explain what size gland is used for what size o-ring. So if you measure the gland and the bore of the cylinder then you can determine the nominal o-ring to use. From there you can wander the site and determine the proper material and if a plain o-ring is best or maybe a quad ring is better suited. You also should know materials compatibility with the fluid your using.
lg
no neat sig line
On the above link they explain what size gland is used for what size o-ring. So if you measure the gland and the bore of the cylinder then you can determine the nominal o-ring to use. From there you can wander the site and determine the proper material and if a plain o-ring is best or maybe a quad ring is better suited. You also should know materials compatibility with the fluid your using.
lg
no neat sig line
matt_i
Well-known member
Imo dial caliper is better if you have it. Have to determine the "cord" size which is the o-ring's cross-section diameter.
The other useful trick is to measure the ID of the gland...the o-ring must be stretched, slightly, from its initial free-state measurement, to work properly.
The other useful trick is to measure the ID of the gland...the o-ring must be stretched, slightly, from its initial free-state measurement, to work properly.
rlitman
Well-known member
Almost all o-rings I encounter match ones in one of my kits. Most sizes only have one thickness, so that’s usually the easy part to match. Diameter is more difficult when you’re matching an old ring, because they tend to swell over time and exposure.
Bondo
Well-known member
Ayuh,...... These guys are Great to work with,.....
Last summer I needed a huge 6" o-ring for a sea-strainer that's discontinued,....
Call these guys, 'n told 'em the size I thought I needed,.....
Less than a week later, I had 2 copies, 'n they were fairly cheap,......
APEowner
Well-known member
Wow- great resource - thank you!
U R Welcome. I've gotten so much help, links, and advice from the forum here I try and give back when I can.
After using them for a while, we had issues getting our orders so we stopped ordering from them. This was a few years ago, maybe they’ve gotten better.