O ring sizes


Technical information and Q&A applicable to all years and models of Goldwings
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froche
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O ring sizes

Post by froche » Mon Dec 02, 2019 11:49 pm



When Honda says 46x2 o ring exactly what are they saying?
46 mm id or od?

When ordering o rings from an oring "house" the first number is usually id, I know the 2 means cross section (diameter of the "rod" making up the oring)

So would the Honda 46x2 be a 46 od x 42 id x 2 cs or
50 od x 46 id x 2 cs?



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OldguyGlen
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Re: O ring sizes

Post by OldguyGlen » Tue Dec 03, 2019 12:16 pm

O-ring format:
1st # is ID, 2nd # is cross section of perimeter "rod".
So a 46 x 2 o-ring is 46 mm ID, 50 mm OD and made with a 2 mm dia "rod".

Try to get an official metric o-ring when you can. But hard to find rings sometimes can be found at ACE hardware (and other common source retailers) by substituting a close match in SAE (inch dimensions) When in doubt, choose a slightly smaller ID as they will stretch a bit (don't overdo the stretch thing though.) If you can't find the original spec, you can measure the OD of the metal piece (groove) as a starting point.

froche
Posts: 196
Joined: Wed Mar 12, 2014 1:56 pm
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Motorcycle: 1985 Goldwing Aspencade (GL1200A

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: O ring sizes

Post by froche » Tue Dec 03, 2019 12:21 pm

Thanks for the reply, but still not an answer.

I get orings on line, metric, SAE, Fractional and JIS sizes are available. The 46x2 is available for .25 from there but i still need to know if Hondas 46x2 means 46 id or 45 od.

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gipsy42
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Re: O ring sizes

Post by gipsy42 » Tue Dec 03, 2019 8:06 pm

Hi Froche:
A little search allowed me to find this tech spec in the www.sealanddesign.com site:

" Japanese Metric O-Rings (JIS)

The Japanese Industrial Standard (JIS B 2401) contains three groups; aerospace group, general purpose group, and traditional group. These o-ring sizes are unique to Japan's automotive, semiconductor, and manufacturing industries.
JIS O-Ring Groups
Aerospace Group
367 sizes and follows ISO 3601-1 very closely (with a few extra sizes).
Each size is designated by its dimension: ID × cross-section. Subsequent to the dimension, the letter "A" is appended to indicate use in aerospace applications.
General Purpose Group
Contains 445 sizes and matches ISO 3601-1 very closely (with a few extra sizes).
Each size is designated by its dimension: ID × cross-section. Subsequent to the dimension, the letter "G" is appended to indicate use in general purpose applications.
Standard metric sizes for O-rings are defined by International Standard ISO 3601-1:2002: Fluid power systems O-rings Part 1: Inside diameters, cross-sections, tolerances and size identification code. That standard groups metric sizes into two series, G and A. The G series is used for general purpose applications and includes a wide range of inside diameters. The A series is used for aerospace applications where tighter tolerances are recommended. The G series has 445 sizes and the the A series has 383 sizes. "
I hope this is what you're looking for.
Regards.
Mario
aka Gipsy42
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I just regrets the things I haven't done.

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froche
Posts: 196
Joined: Wed Mar 12, 2014 1:56 pm
Location: Vista, ca
Motorcycle: 1985 Goldwing Aspencade (GL1200A

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: O ring sizes

Post by froche » Tue Dec 03, 2019 8:14 pm

But Honda o rings are mentioned in the parts book as 46x2
46 id or 46 od?
A simple question that nobody has answered though you may have found that a 46x2 Honda o ring, according to JIS specs you provided, is 46 id x 2 cs. That means that it is 46 mm id, 50 mm od and a 2 cs.

I guess I am going to have to take apart something and measure it!

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Re: O ring sizes

Post by WingAdmin » Tue Dec 03, 2019 10:25 pm

froche wrote:
Tue Dec 03, 2019 8:14 pm
But Honda o rings are mentioned in the parts book as 46x2
46 id or 46 od?
A simple question that nobody has answered though you may have found that a 46x2 Honda o ring, according to JIS specs you provided, is 46 id x 2 cs. That means that it is 46 mm id, 50 mm od and a 2 cs.

I guess I am going to have to take apart something and measure it!
Two people have already given you the same answer!

Metric O-rings (of which Honda uses, of course) are ID x diameter. So a 46x2 is as you say, 46 mm ID, 50 mm OD, 2 CS.






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