Metric ORFS (o-ring face sela) reference table?

[archibald tuttle]

I've checked various usual suspects including Parker-Hannifin catalogue and several online hydraulics parts suppliers who have good documentation for many connector standards, but I cannot find a table cross referencing connector nut sizes or thread diameters to nominal size for Metric ORFS.

I'm just looking for caps because I have to remove some lines for servicing parts underneath and want to cover the open connections quickly and effectively. Easy to come by for the JIC 37 deg. fitting, but a couple of the connections are Metric ORFS.

The actual size of the male threads is .807 which doesn't correspond to any fractional or interger metric size, but a 22x1.5mm die threads right on, so I'm pretty sure the thread is 1.5mm. It could be a loose fit 21 mm or . . .

Discounthydraulichose.com has a fine table for fractional ORFS but the closest fractional nom is 1/2" which would have 13/16 inch outside thread diameter with 16 tpi. 1.5mm per thread translates to about 17 tpi. And I've had some lines replaced on the machine over time and know they were metric ORFS, but I didn't commit the sizes to memory, not imagining it would be that hard to find a reference.

Parker offers some Metric ORFS fittings in its Seal-Lok catalogue, but only by nominal size, there are no specs or dimensions for parts of the fitting that would help you identify.

Don't know how, in the internet age, its possible for there to be no reference out there. Maybe it is just a free for all in the metric world, or maybe its a military secret, but if the collected wisdom here can offer me any help, that would be great.

thanks,

brian

 

[oldnslo]

I could be proven wrong but I do not think their are metric threads for ORFS fittings. All of the ORFS fittings I have uses have been SAE UNF threads.

 

[Furu]

What are the connectors you are taking off the lines you want to cap? Do they have a part number and manufacturer code stamped on them?

 

[archibald tuttle]

No labeling, no parts numbers. I'm pulling flexible hoses with female threaded swivels off of captive male ends on hdraulic manifolds. These connectors aren't well referenced in the parts manual for the machine (gray market hitachi excavator) and when I did order a part from the book, it was the wrong size. That turned out to be a fracitonal JIC connector and I got the right size by reference to JIC charts.

Even the metric flare connectors, similar to JIC but different deg. pitch on the flare, are metric nom tubing but have fractional threading on the connectors. You can tell the difference without a protractor because the metrics don't use the same fractional bolt sizes as the fractional Dash standards.

That could be the case here. They might be Metric nom with fractional threads or it might be a fractional standard and I'm being fooled by how close metric and fractional threading are on these relatively obscure bolt diameter fittings.

Maybe the 22x1.5 mm die is just a close enough fit that it feels perfect thread pitch, but I would think if it is a thread off (i.e. the 13/16 is a 16 threads per inch and 1.5 mm works out to 17 threads per each (or pretty **** close to that)) it would hang up a bit and not feel perfect, but maybe there is enough slop that it just feels perfect. I don't have a 13/16 x 16 die but looks like maybe I need to chase one, or at least a nut to check. I have a kit that goes to 1", but I don't think it has the 16ths above 3/4". I'll check at the shop today, and get with my bolt guy tomorrow.

At .8125, That is the closest fractional diameter to the .807 I'm getting with the caliper and it's closer than 21mm, so maybe, whether this is metric nom or not it is fractional threading and the 1 thread/inch difference, given the looseness because the die was a 22 was misleading me to think it was a 1.5mm thread.

Can't figure out how to copy the table and paste it here from the .pdf but it is page 10, ORFS specs in Discount Hydraulics Thread Identification pdf. At first I didn't think it could possibly be the 13/16" standard because the chart shows that as outside diameter of .82 and I was getting .807. But 21 mm is .826, and 13/16 is really .8125, so it is the closest to what I am measuring. Maybe they just rounded the chart up or . . . ?

thanks for writing back, as you made me think again about whether this could be a fracitonal connector.

 

[J_J]

http://products.worldwidemetric.com/category/sae-j1453-orfs-o-ring-face-fittings

Adapter SAE J1453 / DIN 2353 with Swivel Nut on World Wide Metric, Inc.

Adjustable Male Stud Elbow with O-Ring and Washer Thread Metric Parallel on World Wide Metric, Inc.

 

[Furu]

I looked at both J_J's references and Parker's Catalog and they appear to have metric ORFS fittings.

I measured this morning some ORFS male fittings to see how they mic'ed out. #8 ORFS were 0.809 Thread O.D. with a 0.783 Thread I.D. which do not concur with the chart numbers very closely. (depending on your definition of close) The #10 ORFS were 0.996 and 0.953 O.D./I.D. respectively which also did not match the chart that closely either. These are fittings that are brand new, never used so no thread wear at all.
You said you mic'ed yours at 0.807 O.D. I would think you may have a #8 ORFS male and would certainly try to gently thread a #8 cap and see if it threads easily and well.

 

[bazman]

Sounds like a -8 ORFS to me. Don't know if i've ever seen a metric ORFS. Here is a couple of places for regular ORFS fittings:
ORFS Union
ORFS Adapters | ORFS Fittings | O-Ring Face Seal | www.hydraulicsdirect.com

 

[bkreuzkamp]

I make hydraulic hoses all day (Parker distributor).... sounds like -8 ORFS. If you have an "off the wall" metric ORFS, it would be the first Ive heard of.