Propshaft bolts

[Graham]

Does anyonw know what size,lenght,thread the propshaft to diff bolts are

Cheers graham

[Number 7]

Not much help I know (especially as I had my prop out a couple of months back), but all I can say is that they are imperial, not metric. Not that difficult to get one out and measure it though.

[Graham]

Number 7 said:

Not that difficult to get one out and measure it though.

it is if they are already out and in the same box as the elusive gearbox mounting bell that i've just had to buy a replacement for lol

[Wedg1e]

I have a feeling they're 7/16" UNF, same as the diff to halfshaft bolts - and I think they're supposed to be shouldered as well so they're a light press fit in the holes (so the torque can't make the flanges fret against each other and shear the bolts)... but I doubt that TVR did it properly, in which case normal UNFs about an inch and a quarter would be long enough.

[Toby Tram]

I think they're normal UNF bolts. Not shouldered. I don't think I've ever come across shouldered ones on any of my cars. 7/16UNF sounds about right to me.

Good Luck!!

Adi

[Graham]

TA, I'll go and rain my mates workshop then, He's never got anything metric so imperial should be a doddle

[Wedg1e]

Toby Tram said:

I think they're normal UNF bolts. Not shouldered. I don't think I've ever come across shouldered ones on any of my cars. 7/16UNF sounds about right to me.

Good Luck!!

Adi

I agree they probably aren't but I'm sure Jaguar specified shouldered ones as per the half-shafts.

[B@man]

They are odd, 7/16 unf thread but with a 14mm head and metric markings!

[hallsie]

Wedg1e said:

Toby Tram said:

I think they're normal UNF bolts. Not shouldered. I don't think I've ever come across shouldered ones on any of my cars. 7/16UNF sounds about right to me.

Good Luck!!

Adi

I agree they probably aren't but I'm sure Jaguar specified shouldered ones as per the half-shafts.

yes they are, you can get them from http://www.sngbarratt.com/Home.aspx?b=UK

Stu

[Campbell]

I've just checked the price and it looks like a sensible price to me for the bold a nut.
For me I have a really good company about 20 miles away that sell all manor of fixings and I just go to them and they sort me out and always a great price.
Good find as I have a Jag and will be looking at there sock for spares.

[phillpot]

B@man said:

They are odd, 7/16 unf thread but with a 14mm head and metric markings!

Metric fine? But that seems a bit to modern for Jaguar back then!


From my limited experience propshaft bolts often have a lot of shoulder and not much thread, they are not to the standard proportions of "everyday" bolts from a general "nut 'n bolt" supplier. you may not even get bolts that short with a shoulder (so technically they will be set screws).

[B@man]

Not metric fine as I'd already tried that, in the end I reused mine with new nuts, you are probably right about the shank / thread length.

Personally I'd buy the correct spec from sng Barratt.

[Wedg1e]

phillpot said:

Metric fine? But that seems a bit to modern for Jaguar back then!


From my limited experience propshaft bolts often have a lot of shoulder and not much thread, they are not to the standard proportions of "everyday" bolts from a general "nut 'n bolt" supplier. you may not even get bolts that short with a shoulder (so technically they will be set screws).

You're misunderstanding the concept of the shoulder; it's not the difference between a bolt and a setscrew, the type I'm on about have a slightly wider portion of the shank just below the head that makes them a press fit in the hole in one flange so they stay put when you take the nuts off and (I suspect more importantly) are not able to move around within the hole. The diff. output flanges use the same type.

[Graham]

great guys thous shg ones dont seem too bad price wise so I'l order some from there

G

[hallsie]

SNG also do the diff shims for setting up the rear discs and setting the camber correctly, and for mere pennies too.

Stu

[TVRleigh_BBWR]

Don't know length but 99% sure they are 3/8th's unf. they are bolts as they are not fully threaded (set screws are threaded the whole length).
i think a lot of people use socket caps (i.e. alan key heads) as easier to get a ball end hex socket on the UJ side than a socket.

[uglymug]

hi, and don't forget to use 10.9 grade rather than 8.8 grade. They have a 40% more shear stress than 8.8. WTF ????????? I hear you cry. The grade is always that funny number on the top of the bolt.