Bolt Size Help

[jmc]

I hope it's not nominally about 5/8".

5/8-18 and M16-1.5 are so close that you could probably start a bolt in the wrong hole and run it in a few turns. If you're using a tap for a thread gage, you could run it in even more, thinking there's gunk in there.

 

[Root Cause]

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

My Ace hardware store has one of these, your GOOD hardware store may have one as well. Or buy one yourself, see link below.

Amazon.com

 

[LD1]

I bet they are 12mm. The head size on a 12mm is commonly 19mm which a 3/4" wrench fits perfectly. That means the size is very close to 1/2" SAE, probably a little larger. Thread pitch is another matter. 1 and 1.5 is common but if it is a finer thread it may be a 1.75.

Actually, 1.75 is the coarser thread.

1.5 is fine and 1.25 is extra fine

 

[LD1]

I hope it's not nominally about 5/8".

5/8-18 and M16-1.5 are so close that you could probably start a bolt in the wrong hole and run it in a few turns. If you're using a tap for a thread gage, you could run it in even more, thinking there's gunk in there.

He said the M16 bolts he got were too big. That leaves 12 and 14. 14 isn't very common.

A 1/2" bolt will fit loosely in a M14 hole. It will be too be for an M12. So easy to tell those two apart if you have a simple 1/2" bolt

 

[4570Man]

He said the M16 bolts he got were too big. That leaves 12 and 14. 14 isn't very common.

A 1/2" bolt will fit loosely in a M14 hole. It will be too be for an M12. So easy to tell those two apart if you have a simple 1/2" bolt

12 mm is just under a 1/2. You’d be hard pressed to identify a 1/2 course thread from a M12-1.75 by eye without gauges. They’d probably thread together if forced. But you could just about bet the farm it’s not a 1/2 bolt in a Kubota unless someone changed it. On the subject of that I’ve had problems with my Grasshopper slinging the deck pulley ( the 1” bore pulley I put there after I broke the other one. Pretty much everything on the Grasshopper is SAE bolts including the blade bolts. So I falsely assumed the shaft was 1”. After it self destructed I was measuring to buy new parts and discovered the spindle was 25mm. 25mm is only 15 thousands under 1” so it wasn’t immediately apparent.

 

[KWentling]

If they are the same as my M7060, I'm thinking they are 14x1.5. If I think of it I'll check to be sure but it might not be until the weekend. Menards had them.

 

[BravoXray]

I could be wrong but I though JIS was for hydraulics and pipes and such. Not really anything pertaining to nuts and bolt threads.

Hydraulic and pipe fittings are JIC.

 

[KWentling]

Hydraulic and pipe fittings are JIC.

And the japanese have 30 degree JIS. I deal with it regularly on Okuma CNC machines.

 

[number two]

I see some bolt heads on one of my B2150s that say "10.9" which I believe means it is a 10mm metric bolt with 9 threads per cm. Not that your bolt holes are that size at all.

14 MM isn't that uncommon.
Our B3030 uses M14x2.0 for the grille guard attachment-think recent GM pickup wheel nuts.
Good Luck!

 

[workinonit]

Actually, 1.75 is the coarser thread.

1.5 is fine and 1.25 is extra fine

My bad. You are correct. That number is in pitch not threads per mm. I was thinking in reverse.