Thread conversion?

**Cool1** · 01-01-2006, 09:38 PM

I have a sore head and a blocked ear

Anyway, does anyone have a thread conversion chart or something?
I have a few things here, fuel pumps, filters and tanks all marked with different thread

My pump has 10/.1mm fittings, the filters have AN6 and AN8 and the others have I dont know yet!
Whats AN6 and 8?

**Big T** · 01-01-2006, 10:29 PM

Here you go dude:

http://www.earls.co.uk/car/3_hose_fi..._auto-flex.pdf

Credit should go to Ed_JZA80 though since he was the one that showed me the page in the 1st place

Eddie.

ed · 01-01-2006, 11:59 PM

what ^^^^^^^ said

cheers
ed

**Cool1** · 02-01-2006, 12:23 AM

Thanks for that, but I dont see anything in there about threads

Is AN6-8 metric thread?

**takai** · 02-01-2006, 12:56 AM

I think you will find it is AN-8 and AN-6, im pretty sure (going back many years here to 1st year), that the AN stands for ANSI, which means that they conform to the ANSI specification.
Im 99% sure that they are also Metric thread designations, but not of the "Metric" standard (as opposed to metric measurement system) since most "Metric" threads are either of the form <number>/0.<number> such as the 10/0.1 which you said earlier. That means 10mm diameter, 0.1mm thread pitch. Or of the form M8/1.25 which means 8mm diameter and 0.125mm thread pitch. Ill let you read about thread pitches and stuff elsewhere. Too tired to type it.

Now back to the AN-8 and AN-6 fittings, im pretty sure they would be 8mm diameter and from memory the ANSI standard is either 0.1mm pitch or 0.125 pitch depending on the diameter of the fitting. Under 4mm or so is 0.1mm and over 4mm dia. is 0.125mm from memory.

Hope that helped, thats kinda just a brain dump of my mind at 12:30 after seeing Narnia

**Cool1** · 02-01-2006, 01:07 AM

Yeah that kinda helps. Just have to confirm the thread pitch.

**Youngy** · 02-01-2006, 01:46 AM

Hi,

you can get these little tools (they look like a set of feeler gauges) that are all the different thread pitches stamped to template. You just line them up with the thread and if they fit perfectly then that is the thread pitch.

You usually see them in the tool shop where the tap and die sets are sold

**Hen** · 03-01-2006, 11:02 AM

Originally Posted by takai

such as the 10/0.1 which you said earlier. That means 10mm diameter, 0.1mm thread pitch. Or of the form M8/1.25 which means 8mm diameter and 0.125mm thread pitch.

M8 by 1.25 means 1.25mm per thread, rather than 0.125

I find the easiest way to work out threads is to just measure over (say) 4 peaks of the bolt with some verniers and work out the distance per thread. This only really works if you know what standard of thread you are working with beforehand. But with factory Toyota stuff it is always Mx by y.z as far as I have seen.

Originally Posted by takai

the ANSI standard is either 0.1mm pitch or 0.125 pitch depending on the diameter of the fitting. Under 4mm or so is 0.1mm and over 4mm dia. is 0.125mm from memory.

The main ones (used on Toyotas) are:
M6 by 1
M8 by 1.25
M10 by 1.25

All of which I think are called "metric fine thread" down at the bolt shop.

Also to work out what size hole to drill before tapping, just subtract the thread pitch from the M size and use a drill of that diameter. Go slightly larger if you dont have the exact drill size (though don't take this too far)

Hen