Need help determining size of JIC connections

[jas67]

I'm going to move my re-remote kit from my Kubota B7100 to my new (to me) Kubota B7610. The connections on the loader valve are JIC (I haven't crawled under to see what the other end of the hoses are, but I suspect JIC as well). Is there a chart somewhere online showing the dimensions of the various sized JIC connectors? 4M, 6M, etc, is that metric? 4mm, 6mm? Is that the dia. of the hose, or the connector?

I'd like to be able to get the correct sized connectors via Surplus Center, or Discount Hydraulic Hose online.

Thanks in advance,
Jay

 

[biggerten]

The number is in 16ths of an inch.

4M = 4/16 = 1/4"
6M = 6/16 = 3/8"
8M = 8/16 = 1/2"

Here's a link - https://www.redhorsedirect.com/catalog/pages/rhp-sizechart.htm

 

[Discount Hydraulic Hose]

I'm going to move my re-remote kit from my Kubota B7100 to my new (to me) Kubota B7610. The connections on the loader valve are JIC (I haven't crawled under to see what the other end of the hoses are, but I suspect JIC as well). Is there a chart somewhere online showing the dimensions of the various sized JIC connectors? 4M, 6M, etc, is that metric? 4mm, 6mm? Is that the dia. of the hose, or the connector?

I'd like to be able to get the correct sized connectors via Surplus Center, or Discount Hydraulic Hose online.

The letter "M" and the fact that you're working on Japanese equipment leads me to believe you probably have metric fittings, and not JIC (which is a North American standard).

There are two Japanese fittings that look very similar to JIC. The first is JIS 30°, which features BSP (British) threads and a 30° sealing seat. The second is Komatsu (sometimes called Metric JIS) and features the same 30° sealing seat, but uses metric thread. The metric threads are usually finer than the BSP threads, but unless you've got one of each to compare side by side, you probably can't tell just by looking at them.

The best way to determine what you have is to measure the thread OD with a set of calipers. If you have a thread gauge, measure the thread pitch as well.

Some of the most common BSP thread sizes are:

1/4-19 --> 33/64" male thread OD (dash size -04)
3/8-19 --> 21/32" male thread OD (dash size -06)
1/2-14 --> 13/16" male thread OD (dash size -08)
3/4-14 --> 1-1/32" male thread OD (dash size -08)

The Komatsu fittings look the same, but the threads will be metric. The male thread OD will be 14mm, 16mm, 18mm, 22mm, 24mm, 30mm or 33mm. All Komatsu threads have 1.5 pitch (threads are spaced 1.5 mm apart).

If I'm missing the mark, and your fittings actually are JIC... the other guy was right. -04 stands for 4/16 (or 1/4"). Keep in mind that these are nominal sizes, and they usually refer to the tube OD, not the actual thread dimensions. A 1/4" (or #4) JIC fitting is designed for use with 1/4" steel tubing. The thread on that fitting is 7/16-20, so be careful not to confuse tube size with thread size.

I'm including a link below that will show you thread sizes, tube sizes and nominal dash sizes for JIC and several other common American fluid port connectors.

Fluid Port Size Charts > Discount Hydraulic Hose.com

I've been meaning to update that page to include metric and British threads, and hopefully that will get done soon. Regardless of where you decide to buy your fittings, the information here will help you identify what you have and what you need.


Ken

 

[BlacknTan]

Check out this old thread by member PSDawg.

He pretty well detailed the whole installation on a 7510, and included a list of all the fittings he used for the install.

http://www.tractorbynet.com/forums/kubota-owning-operating/84320-finished-7510-remotes.html

 

[jas67]

The letter "M" and the fact that you're working on Japanese equipment leads me to believe you probably have metric fittings, and not JIC (which is a North American standard).

Ken -- thanks for the info.

This is a dealer-installed Kubota LA352 loader, so maybe someone else here knows for sure (Messick's -- are you reading this)?

J.

 

[Discount Hydraulic Hose]

Just to add one more thing. I was looking for some parts yesterday, and I found a dealer who was using the abbreviations "4M", "6M" and so on to indicate male fittings. This is not something I see oftem, so it through me for a second. But it might be that you're seeing the same thing.

Anecdotal story... NPTF stands for "National Pipe Thread Fuel." I had a customer send me an email last week after he received his order confirmation. He thought that NPTF was a female fitting. He insisted I give him an NPTM fitting instead. Of course, I explained that his fittings were indeed male, and that NPTF had nothing whatsoever to do with the gender of the fitting.

This is just something else to watch for. There are a lot of official terms and acronyms in this business, and also a whole of unofficial ones that people seem to have made up along the way. I try to be very clear when communicating with customers about this stuff, because their idea of a standard fitting may be very different from mine.

Ken