Are the TD5 nuts and bolts metric, imperial or both?

[twr7cx]

I'm not sure if I'm being stupid or what, but it seems that some of the stuff on the TD5 is imperial sized and then others I can't find a nice imperial fit and a metric fits better. Whats the go?

[gusthedog]

I believe you are correct. Some of the bolts and nuts do seem to appear imperial. I am sure that someone whose knowledge far exceeds my own will let you know for sure though.

[Slunnie]

Yep both.

[OffTrack]

Does anyone have a list of which fittings are imperial?

There appear to be only a handful on the Td5, but the V8 appears to have quite a few.

I've had a quick look at Microcat the first ones I found that was imperial are the propshaft nuts and bolts which are 3/8 UNF. The rotoflex end uses M12.

For the Td5 at least the vast majority of fittings that I've been able to locate in Microcat are M size (with the exception of the propshaft fittings) with M6 (10mm), M8 (13mm), M10 (16mm), M12 (18mm) and M16 (24mm) being the most common.


cheers
Paul

[Slunnie]

Does anyone have a list of which fittings are imperial?

There appear to be only a handful on the Td5, but the V8 appears to have quite a few.

I've had a quick look at Microcat the first ones I found that was imperial are the propshaft nuts and bolts which are 3/8 UNF. The rotoflex end uses M12.

For the Td5 at least the vast majority of fittings that I've been able to locate in Microcat are M size (with the exception of the propshaft fittings) with M6 (10mm), M8 (13mm), M10 (16mm), M12 (18mm) and M16 (24mm) being the most common.


cheers
Paul
Propshaft is what sprung to mind for me, but I would assume anything that is carry over and from the motherland like diffs, maybe transfercase etc.

[twr7cx]

Exhaust manifold bolts and nuts are 1/2".

[Blknight.aus]

90% of the td5 is metric. (including the torqz bits)

the imperial is mainly the 3/8-1/2- 9/16 and 5/8 sizes...

The oil lines are imperial but the metric open enders fit well enough for the job.

A set of R/oe and the sockets in the above sizes will work.

[OffTrack]

Exhaust manifold bolts and nuts are 1/2".

Someone must have replaced the original studs if that is the case. The factory exhaust studs are M8.

[Bigbjorn]

Someone must have replaced the original studs if that is the case. The factory exhaust studs are M8.

M8 x what? ALWAYS quote the pitch no matter what system of fastener you are referring to. This avoids errors. In M8 the following pitches are in relatively common use. 0.75, 1.0, 1.25, 1.5.

I know people tend to use "M and a number" to refer to ISO Coarse. Just keep in mind that ISO coarse is not the only pitch used in a given diameter. Some diameters have five pitches in relatively common use.

[OffTrack]

M8 x what? ALWAYS quote the pitch no matter what system of fastener you are referring to. This avoids errors. In M8 the following pitches are in relatively common use. 0.75, 1.0, 1.25, 1.5.

I know people tend to use "M and a number" to refer to ISO Coarse. Just keep in mind that ISO coarse is not the only pitch used in a given diameter. Some diameters have five pitches in relatively common use.

How exactly is pitch relevant when we are discussing head size of the fasteners in use on the Td5?

Add: 1/2" = 12.7mm so depending on tolerances/wear on nut it is quite possible that a 1/2" socket is a tighter fit on a m8 nut than 13mm socket.

[Blknight.aus]

pretty much since someone bought up M(x) as a head size...

M(x) is a bolt shank size (aka a touch larger than the major diameter of the thread) and in the metric (and the UNC/UNF) world of bolts is absolutely nothing to do with head size.

Now if were were talking BSF, BSC or BSW that'd be different, in those thread sizes the AF size of the head is directly calculated from the thread size.

[OffTrack]

M(x) is a bolt shank size (aka a touch larger than the major diameter of the thread) and in the metric (and the UNC/UNF) world of bolts is absolutely nothing to do with head size.


The shank size is different to the head size but there are international standards which define the standard head size for m(x) fasteners, so there is a defined relationship between shank size and head size. Under the ISO standard an M8 fastener has a head size of 13mm for example.

RAVE indicates that ISO standard is used for metric fittings on the D2.

46561

Edit: The DIN sizes are actually the same as the ISO precision metric sizing. Ignore the ISO/ANSI sizes as this seems to refer to a different standard.

[Blknight.aus]

Bet I can name 3 bolts on any td5 that do not comply to that standard. And thats without even thinking about it or going off the engine.
.

[OffTrack]

Bet I can name 3 bolts on any td5 that do not comply to that standard. And thats without even thinking about it or going off the engine.
.

Hi Dave,

It looks like there are ISO Standards and ISO Standards.

BS-3692-2001 ISO metric precision hexagon bolts, screws and nuts gives head dimensions that look to be the same as DIN rather than Australian Metric or ANSI/ISO.

BS-3692 lists:

M5: 8mm
M6: 10mm
M8: 13mm
M10: 17mm
M12: 19mm
M16: 24mm

The 17mm/19mm seems more in line with the bolts on the D2, than 16mm/18mm.

[Blknight.aus]

correct..

I still take immense joy in watching appy mechanics working on the bearings on certain landies that are still in service at amberly.

The front axle (which has been replaced for the Nth time) will have a fairly stock standard type 10.9 bolt on it (the drive flange) as you would expect to find. The back will have the smaller headed but flanged bolts. Send them off to the RPS and the diagram shows the bolts that are on the rear and the same type on the front, they order more for the front but the new standard style bolts turn up....

Ive gotten to the point on some jobs unless I'm ordering an OEM bolt like the headbolts, mains or bigends then a bolt is requested as

ok, what thread do you want, what type and size head do you want on it.

My other favorite is when people ask for an M(x) thread giving them a inhex stud version of it.