hello guys and thanks in advance. recently i bought some items for my t2 that were removed by the previous owner. like the undertray, radiator shroud and radiator brackets. now i dont have hardware for any of it, do you guys know where i can go to get the threads and lengths of the bolts?

 

Undertray is the usual .6x1.0 metric bolts..a common size and length on the car that Mazda uses.
Rad brackets attech to the rad with the same size bolts.
I can't remember if the size is a .8 or a 1.0 for the rad to car bolts.(I think they have a 14mm head though)

 

Metric is speced by diameter in millimeters and thread pitch (distance from one thread to the other}

Common forms would be M6X1.0, M8X1.25, etc. Larger sizes come in fine and coarse, sometimes more than just the two.

 

Rad to chassis are 8 x 1.25, maybe 20mm long.

If you go to Ace for hardware, a 8mm bolt will have a 13mm head.
A real JIS (Japanese Industrial Specification, I think) 8mm bolt will have a 12mm head.

 

/\..that is why I like to have a big *** plastic tote of bolts.
I hate switching sockets when I just have to get one bolt at the store..lol.

 

I think we all have one of those containers

We use plastic coffee and peanut containers.

 

Oh yes, we most certainly do.

 

Clokkar is correct, so here's a short rundown of the most common sizes you'll encounter. Mazda used JIS (Japan Industrial Standard) Hardware from the factory, but you'll have to settle for DIN (Deutsches Institut für Normung) at your local hardware store. They work the same, are graded/classed the same, just use a different size wrench hex in most cases above m6x1.0. Generally speaking, the JIS hardware rule is thread size plus 4

Thread size/pitch: Wrench Hex size
M4x0.7: 7mm. This is what the FC's fuel pump flange uses, but with phillips heads.
M5x0.8: 8mm
M6x1.0: 10mm
M8x1.25: 12mm (JIS), 13mm (DIN)
M10x1.25/1.50: 14mm (JIS), 17mm (DIN)
M12x1.25/1.50: 16mm (JIS), 19mm (DIN)

Years ago, I got sick of having to ask "What size is this bolt?" and bought a metric bolt assortment from Harbor Freight and a divided box to allocate each size in its own cell. Since it only had M5, M6 and M8, I added on the other sizes through multiple sources over time. Recently, I'm phasing out all of the unmarked stuff in favor of A2 Stainless and Class 8.8 or above in each size. Stainless bolts are becoming way too useful, so I started buying them in bulk packs. Oh, how it pains me to only be able to make grounds correctly...

Be thankful you don't have a Ford, they made up their own goofy downsized standard when they were dragged kicking and screaming into the 20th century. On my 97 Expedition, M6x1.0 uses an 8mm wrench, the coil mounts use a 7mm wrench despite being M5x0.8 threads and so on...

 

Or buy a metric thread pitch gage.

 

I have one as well, and found that it's not a very useful item when dealing with common hardware as one would routinely encounter on these cars. The only logical time I could find a use for it would be when it's an oddball or uncommon thread pitch/size such as the early S4 temperature gauge sender (M8x0.75). And in that case, it would have to be paired up with a caliper to obtain the diameter. Far simpler to just have a divided box with the common sizes in it. Can be done cheaply if they're leftovers from other projects.

 

Thread pitch and... Yes, someway to get diameter. Having been a Machinist for the last 25 yrs or so, my pitch gauge has never let me down. I don't really know where your coming from about weird metric thread pitches. Yes, you do need to know the diameter too.

Pitch and diameter, it's how a metric thread is described.

Something like this is good.

https://www.mscdirect.com/product/details/86405917