Yaris Seat bolt size ??

[ChrisRuffell]

Hello everyone

im in the process of fitting t sport seats in my t spirit... I have all but ruined the hex bolts that hold the seats in. 

The screws are m10x25 but the bolts I have this size have the wrong thread... Does anyone know if they are metric fine thread or something odd that only Toyota do??

[FROSTYBALLS]

Does your profile need changing from the Corolla??

[ChrisRuffell]

11 minutes ago, FROSTYBALLS said:

Does your profile need changing from the Corolla??

Haha yes! The Corolla was a few years ago, had a period of company cars and then returned to Toyota with a little yaris

[MikeSh]

I don't know about the threads but bolts for seats are often hi-tensile steel (often these have a matt black finish), so make sure you use the correct type.

It is possible that hi-tensile might use the fine thread as (I'd think) they would be stronger. Are all the bolts really too mangled to even check what the thread pitch is? (You just need to count the number of threads in an inch and then Google metric thread sizes to find out which type it is.)

[mrpj]

Threads per inch (t.p.i.) on a metric bolt? That takes me back a few years! No, the pitch is the measured distance between the same point on two adjacent threads in mm.

This table might help https://www.boltdepot.com/fastener-information/Measuring/Metric-Thread-Pitch.aspx

Although it doesn't tell you what pitch your M10 bolts are it will surely be one of the three. Measure between the peaks of two adjacent threads and see what it is. e.g. 1.0mm would indicate M10 x 1.0 bolts.

 

[TomdeGuerre]

You mean he doesn't need a micrometer and three bits of wire? 

[MikeSh]

8 hours ago, mrpj said:

Threads per inch (t.p.i.) on a metric bolt? That takes me back a few years! No, the pitch is the measured distance between the same point on two adjacent threads in mm.

Although it doesn't tell you what pitch your M10 bolts are it will surely be one of the three. Measure between the peaks of two adjacent threads and see what it is. e.g. 1.0mm would indicate M10 x 1.0 bolts.

OK, I'm an old git 

But seriously, don't try and measure adjacent peaks as you will be looking at differences between thread types of fractions of a mm. Instead count a block of as many peaks as you can (at least 10, 20 or more if possible) then measure across the whole block and divide by the number of peaks in it to get the pitch.

For example, I count off a block of 20 peaks, measure the block as being 14mm long, 14 / 20 = 0.7mm pitch.

[ChrisRuffell]

I found myself a more simple solution! Went into Toyota , asked them and have ordered 8 bolts for 99p each 

 

part number 90148-10002

 

absolute pain getting the old ones out. Had to use an easy out kit (£3.99 from screwfix) on 7 bolts and the last one had to be completely drilled out. All worth it in the end!?!

[ChrisRuffell]

http://www.ebay.co.uk/itm/Genuine-Toyota-Screw-Hex-Lobular-Yaris-FRP-9014810002-/221883340047?hash=item33a947150f

[mrpj]

18 hours ago, TomdeGuerre said:

You mean he doesn't need a micrometer and three bits of wire? 

A steel metric rule and good eyesight never failed me.

Yes, I'm an old git too.