FIL is making a mounting step for his Ford tractor he uses for mowing. Sorry, I don't remember the model #. It's about a 30 hp, probably a late 80's vintage. All of the hardware is metric. There are four bolt holes on the bottom of the trans that we want to mount the step to. I'm guessing this was for a loader mount or possibly something for a belly mower. Any way, they appear to be 15mm wide by aproximately 1 inch long, course thread. 14 mm and 16 won't fit. No hardware stores have them, McMaster Carr shows no 15mm, dealer has no clue. Hardware specialist said about 20 yrs ago they "cleaned up" the metric system and eliminated 15 mm bolts. Any ideas, sure would appreciate the help.
- Thread starter JBMac
- Start date
Chris (WA)
Member
There isn't a chance they are US threads instead of metric?
old wrench
New User
Have you checked any motorcycle bone yards?
Hendrik
Member
While I agree that 15 mm does not come close to any regular inch size bolt, I doubt whether your bolt is 15 mm. I am 55 years old, was born and raised on a farm and did a lot of wrenching but have yet to see a 15 mm bolt. Admittedly, I never worked on Ford tractors ;-)
In my teens we still had 12, 14, and 16 mm threads, later the 14 mm was eliminated from the list of recommended sizes. Common sizes these days are 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 24, 32, 48, and 64 mm (and some smaller and larger sizes at both ends of this range...)
HTH, Hendrik, The Netherlands, metric country.
In my teens we still had 12, 14, and 16 mm threads, later the 14 mm was eliminated from the list of recommended sizes. Common sizes these days are 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 24, 32, 48, and 64 mm (and some smaller and larger sizes at both ends of this range...)
HTH, Hendrik, The Netherlands, metric country.
Tramway Guy
Well-known Member
Drill it/tap it to M16 or 5/8" and move on.
You said Metric coarse wouldn't fit, did you try fine?
You said Metric coarse wouldn't fit, did you try fine?
Brian G. NY
Well-known Member
Are we talking bolt diameter or head size?
A 15 MM bolt only 1" long seems a little odd to me?
A 15 MM bolt only 1" long seems a little odd to me?
Traditional Farmer
Well-known Member
- Location
- Virginia
There are 3 basic metric thread patterns I have run across if that helps keep looking.Japanese fine threads are different from European threads.Also some lug nuts are metric so a tire place may have what you need.Might look into Heal A Cores they have some odd sizes and threads
I dunno what you have there... or if 15mm exists, but I would assume that it does. It will also probably come in a minimum of three thread pitches. 1.25, 1.5 and 1.75 mm between threads.
What I do if I'm not sure is start finger threading taps into the hole until I find the correct pitch. Other alternative if you don't have time to screw with it would be simply drilling to correct size and tapping out to 5/8" UNC and be done of it.
Rod
What I do if I'm not sure is start finger threading taps into the hole until I find the correct pitch. Other alternative if you don't have time to screw with it would be simply drilling to correct size and tapping out to 5/8" UNC and be done of it.
Rod
Janicholson
Well-known Member
Take a wooden dowel that is (or can be sanded to) the major diameter of the hole. Spray in some WD or other juice. Thread it into the hole to take an impression and take that with you to the store. Fastenall, or a good hardware store will have it. If you measure the hole, you are measuring the root diameter (tap drill) size, not the bolt size. (you knew that) Jim
Very easy to determine what it is....
First get a thread gauge to determine TPI... Then measure the minor diameter...
Minor diameter + Pitch = Major Dia of metric bolt...
Example... M6 x 1.0... Tap drill is 5 mm.... 5 + 1 = 6
The tap drill is sized to leave root clearance for the tap and provide a 2B class fit which is 75% contact between bolt and hole threads.
Therefore when measuring the hole the hole measured should be very close to the drill used to originally make it prior to the tap cutting threads.
First get a thread gauge to determine TPI... Then measure the minor diameter...
Minor diameter + Pitch = Major Dia of metric bolt...
Example... M6 x 1.0... Tap drill is 5 mm.... 5 + 1 = 6
The tap drill is sized to leave root clearance for the tap and provide a 2B class fit which is 75% contact between bolt and hole threads.
Therefore when measuring the hole the hole measured should be very close to the drill used to originally make it prior to the tap cutting threads.
Janicholson
Well-known Member
Or MM per Thread (metric!!) You knew that. Jim
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