BOLT THREAD SIZES

[GRAPEAPE94]

I had to change the seat on my '06 wing and found that one of the bolts was extremely hard to remove. I am going to replace it with a new one but need to know what thread to chase the hole with. The parts manual shows the bolts as 8-70 which is 8mm dia by 70 mm long but what pitch is the thread? I have 8-1.0 and 8-1.25 taps and want to use the correct one. I will also be using anti-seize on all four bolts when it goes back together.

[ct1500]

The 1500 is M8-1.25 so a good bet would be Thread pitch gauges are good to have. Take the 1.25 and test it by starting in one of the other good threads.

[roadwanderer2]

the easiest way is to take the good bolt and put it up to the threads on the chase, if it mates up with the threads, (bolt and chase threads mesh together), that's the one you need to go with. don't try to put the tap into the good hole, if its the wrong pitch you run the risk of messing up the beginning of the threads, then you wont be able to put the good bolt into it.

stuart.

[ct1500]

??

A correctly sized tap will run down a thread with little to none effort so go ahead and TEST it as stated earlier. Just turn it in by hand without wrench.

If it makes one feel better the tap can be inserted from the rear of the bolt hole.

[tom84std]

Don't know about your area but all of the local hardware stores in my area have a thread sizing fixture in the hardware department. Makes it very easy to find exactly what you've got or what you need. I'd bet yours is a 1.25mm thread which seems to be the most prevalent on my bikes.

[WingAdmin]

Don't know about your area but all of the local hardware stores in my area have a thread sizing fixture in the hardware department. Makes it very easy to find exactly what you've got or what you need. I'd bet yours is a 1.25mm thread which seems to be the most prevalent on my bikes.

Yup. They look something like this:

I wish I had one myself sometimes, but they are a ridiculous price. I guess I could make one myself if I took the time to go buy all the nuts and bolts.

[roadwanderer2]

Yup. They look something like this:

I wish I had one myself sometimes, but they are a ridiculous price. I guess I could make one myself if I took the time to go buy all the nuts and bolts.[/quote]

most of your local hardware stores, (ace, true value, Lowe's and home depot) should have these in their nut and bolt section.........hey wingadmin, you might find them on, (my favorite place) eBay

stuart.

[WingAdmin]

I did see one on eBay...for $80! No thanks.

[roadwanderer2]

Yup. They look something like this:

I wish I had one myself sometimes, but they are a ridiculous price. I guess I could make one myself if I took the time to go buy all the nuts and bolts.

most of your local hardware stores, (ace, true value, Lowe's and home depot) should have these in their nut and bolt section.........hey wingadmin, I found a set on (my favorite place), eBay. type into the search box "metric bolt gauge" for the metrics and "inch bolt gauge" for the SAE's. it will bring up a whole page of them, some for ridiculously cheap prices .

stuart.

[Big Blue UK]

I did see one on eBay...for $80! No thanks.

I use these pitch gauges they only cost a quid or two.

[roadwanderer2]

I did see one on eBay...for $80! No thanks.

$80.00???? where did you see those. the ones I saw were less than 5 bucks............Blue, those are pretty decent.

stuart.