Bolt Size Help

[Kesbo]

Hello, I am trying to find the correct size bolts to fit my M6060 I am attaching a picture I found showing the bolts holes I am looking for. I have tries several sizes both metric and SAE but to no avail. And I have looked at the diagrams at Messicks and they are not shown. Anybody Know what size these are metric standard fine thread pitch etc. I need bolts to fit up in the two holes in front of this bracket someone else built in the picture. Thanks

With a basic caliper, you can measure, then compare to a bolt ID chart or document. This is an excellent resource: https://www.boltdepot.com/fastener-information/printable-tools/Printable-Fastener-Tools.pdf or Fastener Size Tables | MechaniCalc. I had to replace some sheared bolts on my Mahindra 3616 front axle hub. It turns out they are a metric fine thread that I was able to identify by measuring the bolt diameter and number of threads per inch. Also consider bolt strength as shown here: Hex cap screw strength comparison | Fasteners, bolts, screws and more from Atlantic Fasteners. And finally consider tightening torque Bolt Depot - US Recommended Bolt Torque Table and Bolt Depot - Recommended Torque for Metric Bolts

 

[joea99]

I usually resort to my tap & die set to find a bolt or hole size & pitch. Try different taps to see if you can get one that threads in. A tap works better than a bolt for this since it will clean paint and debris from the threads. Use care so you don't cross thread.

If all else fails, you can always drill & tap the holes for a larger bolt size.

I found a safer way is to use a "thread restore kit" that resembles a tap and die, but is not designed to "cut" threads, but to clean out and "roll" buggered up threads.

Saved my bacon bits a few times. Posting a link to Amazon for convenience only, not endorsing them or the vendor.

Amazon.com: Ctooltool Universal 42Pcs Thread Chaser Set, Rethread Repair Tool, Fractional and Metric Thread Restorer Kit : Industrial & Scientific

Buy Ctooltool Universal 42Pcs Thread Chaser Set, Rethread Repair Tool, Fractional and Metric Thread Restorer Kit: Thread Milling Taps - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

[LD1]

You're thinking of JIC. Joint Industries Council 37° flare angle. And further investigation suggests that while JIS standards dictate for ferrous and non-ferrous materials, fastener threading standards are absent.

https://en.wikipedia.org/wiki/Japanese_Industrial_Standards

Nope.

I know what JIC is. I have dealt with hydraulics for a few decades now.

Someone earlier mentioned that it could be JIS threads in them holes. And the only time I have heard JIS and threads referenced together is when dealing with pipe/tubing fittings. Though have never used them in person. Quick google search seems to point to a BSPP thread but with a 30 degree seat. Dunno, but in my comment I definitely meant to say JIS

 

[Have tractor did travel]

I lost a Zerk (grease fitting) from my Kubota front end loader. Tried metric threads with no success. Ordered the Zerk from the Kubota dealer, and fit just fine. I'm guessing it was JIS threads. I'd never heard of that thread before and am glad I didn't try forcing metric. OP ought to just call Kubota dealer, send 'em a picture of where the bolts go for which he seeks, and order them.

 

[iateyourcat]

Our local TSC has a wide selection of nuts and that's how I found the correct size for a nut I have having a hard time finding. I used a thread pitch tool and ordered the nuts from Amazon. They didn't fit.. thought I was going crazy, went into TSC and found/bought the same nuts I had already ordered, M10 x 1.25. Turns out they shipped the wrong nuts (M10 x 1.5). Here's the tool: Grip Thread Pitch Gauge MM & SAE Markings - Hand Tool Sets - Amazon.com

 

[ROUSTABOUT]

Last time I shopped SAE bolts at Lowe's, they only carried COARSE threads!

Fine threads are in the boxes on top of bolt bin.

 

[Tony H]

Can you pull out the bolt that screws into the same piece then check it with a Thread Gauge

 

[LD1]

Can you pull out the bolt that screws into the same piece then check it with a Thread Gauge

He's doesn't have a bolt.

 

[JonnyS]

M14 x 1.5

 

[Tony H]

He's doesn't have a bolt.

I see bolts next to the open holes. Pull one, see if it fits, then size it

 

[kpsp50]

Sounds crazy but try a British thread

 

[KWentling]

So I crawled under my M7060 this afternoon, and as I thought, they are 14x1.5. You definitely want to run a tap
or thread chaser in the holes. You might get a bolt in the holes without cleaning the paint and crap out of them first, or you might not. I work in a machine shop so I just borrowed taps when I was making brackets for those holes.

I can assure you guys that there are JIS hydraulic fittings. Like a JIC but with a 30 degree seat instead of 37 and I believe the threads are British Whitworth. They are all over the Okuma CNC machines I deal with.

 

[LD1]

I see bolts next to the open holes. Pull one, see if it fits, then size it

That isn't his tractor. Just a picture on the internet.

He did explain all of this

 

[number two]

I like my Thexton 432 Universal Thread Gauge pack.
4 pieces,measures pitch and diameter.
Under $14

M14x1.50 is still my guess.

 

[Bob Rooks]

Nope.

I know what JIC is. I have dealt with hydraulics for a few decades now.

Someone earlier mentioned that it could be JIS threads in them holes. And the only time I have heard JIS and threads referenced together is when dealing with pipe/tubing fittings. Though have never used them in person. Quick google search seems to point to a BSPP thread but with a 30 degree seat. Dunno, but in my comment I definitely meant to say JIS

Ja, they do exist:

JIS Hex Bolt 8.8 Zinc M8X1.25 Coarse / 12mm Wrench JIS B1180

Bel-Metric sells metric hardware & specialty automotive supplies nationwide. Visit our website to purchase metric fasteners, nuts, bolts, Time-Sert kits & more.

www.belmetric.com

 

[LD1]

So I crawled under my M7060 this afternoon, and as I thought, they are 14x1.5. You definitely want to run a tap
or thread chaser in the holes. You might get a bolt in the holes without cleaning the paint and crap out of them first, or you might not. I work in a machine shop so I just borrowed taps when I was making brackets for those holes.

I can assure you guys that there are JIS hydraulic fittings. Like a JIC but with a 30 degree seat instead of 37 and I believe the threads are British Whitworth. They are all over the Okuma CNC machines I deal wi

So some confirmation of M14-1.5.
Interesting they upsized that hole from the MX/grand L.

Makes me wonder what the original use is for those holes? What option or accessory or use did Kubota have in mind when they machined those holes in that exact spot in the casting?

Ja, they do exist:

JIS Hex Bolt 8.8 Zinc M8X1.25 Coarse / 12mm Wrench JIS B1180

Bel-Metric sells metric hardware & specialty automotive supplies nationwide. Visit our website to purchase metric fasteners, nuts, bolts, Time-Sert kits & more.

www.belmetric.com

That's just a regular ole metric bolt.

 

[Hotpot]

The two open holes have thick paint in them from the manufacturer. So no bolt will fit till you clean/remove the paint from the threads.

 

[ruffdog]

....and use a bottoming tap to get threads as far to the bottom as you can.

 

[KWentling]

So some confirmation of M14-1.5.
Interesting they upsized that hole from the MX/grand L.

Makes me wonder what the original use is for those holes? What option or accessory or use did Kubota have in mind when they machined those holes in that exact spot in the casting?


That's just a regular ole metric bolt.

The M is a larger frame tractor than L's or MX's. This a utility tractor not a compact. What the designed usage of the holes are I can't tell you. I believe Neil Messick had a video of a boom or bank mower mid mount that might have utilized them in some way. It was on the highest HP version of the M.

I am very positive the holes are 14x1.5

 

[ruffdog]

The holes and finished surface may have been used during the machining process for fixturing or for holding during assembly.