Starter bolts fell out of my 1998 Mazda b3000 3.0v6 trying to find out what length ,diameter ,thread for replacement.?

mount starter mount
lost both?
they are both the same diameter.
the length is super easy, measure it.
the leaves, diameter, metric, 8 or 10mm and pitch
so using a box of random bolts with starter off
find one that fits, m8 or m10, or m12.
now you know the sizes, and with starter off the holes are right there. in front of you to test.
to get length, use drinking straw, and your thumb, nail
to find lenght fitted up by and then move straw to ruler, metric
ahhhhhh there is the lenght in 5min work.

if no bolts in the scrap box, at all, metric, buy some.

We have no way to look this kind of info up for anything this old.

what is your question
you know the length and you have stated the size as 10 mm ( thread diameter) with a 1.0 mm pitch
what else do you want to know
the M10 is a grade of bolt equal to grade 7 or engineering grade in tensile strength

Use one of the other alternator bolts for testing, see if the threads are the same on the other bolt hole. If the bolt is a little long or short, just get a different length bolt from the hardware store.

If nothing else, use a tap and die set. If enough meat around the hole, drill the hole and retap the threads. Just a thought.

You didn't give year--make--model?

You mean metric diameter & thread pitch?

You will have to mic the diameter & convert
to metric or just match up at a store

As a guess only--dia may be 1/2 "or 12mm & length say
2" or 50mm

.0395 is (1) mm

Whatever you measure dia or length wise, you
divide by .0395 to go to metric

They heat treated bolts,not a Home Depot
chinese item

gm should be 3 mil from bolt diagram in book i have

Have you tried using thread locker locktite will hold it in there.

First remove battery connection and then wires and connection from starter . then you will need to remove starter bolts.should be only two holding it in place....hope this helps and good luck....Please rate this post..

Ask for this part number at Autozone Part Number: 678-004.1
At Advanced Auto parts ask for this part number Part Number: 72181

You need to get a bolt with the same diameter and thread pitch as the brake drumretaining screws. On my 1997 Escort that's an 8mm x 1.25 thread pitch bolt. The length should be about 12mm. or larger. Don't get a bolt that's longer than about 20mm. The bolt goes into a hole in the brake drum, bearing down on a plate inside the hub. You can't use a brake drum retaining screw because you need to be able to apply more torque to the fastener than could be safely applied to a jacked vehicle