rear tie bar bolt

[Rockettvr]

Anyone happen to know the size of this ??
Bush was buggered - inner sleeve had parted company with the rest of the bush and was rusted onto the bolt - I resorted to cutting the bolt off
Bolt is an imperial size needs a 3\4 AF spanner to undo shaft is around 12mm but I'm lost with imperial stuff (bsf unf Whitworth???)

Cheers Ron

[KKson]

I just changed all of mine rear suspension bolts on one side last month. I'll have to check tonight but I think they were all 1/2" UNC and high tensile

[RCK974X]

Actually, looking at that photo, pretty sure that's a UNF thread

UNC = Unified Coarse, UNF = Unified Fine

Metric threads are nearer UNC in style but between the two - there are metric fine threads too (eg seatbelt bolts).

But stick with a 1/2 inch UNF if that's what came off.

[Wedg1e]

Most of mine were 1/2" UNC but a couple were 1/2" UNF - which is what that one looks like.
Probably down to what they had in stores at the time

[Engineer1949]

the correct bolt is 1/2in unf in 10.9 or above.


john

[KKson]

Double checked and all rear suspension bolts on my 390SE were 1/2" UNC. I refitted with new nylocs also.

[RCK974X]

Engineer, a question....

most HT bolts I see are 8.8 or 'S'

I thought that was (approx) equivalent of the older 'S' which was on UNF and UNC stuff, and that 10.9 is equivalent of a 'T' ??

Is that right ??

For those of you who read this and think "WTF?"

These are ratings for tensile strength. Worth knowing when replacing bolts.

Metric system uses numbers (8.8, 10.9, 12.9) I think the second number is for metal alloy type (or something).
Older imperial system had a single letter (S, T, V, X).
One of these should be visible on the head of a hex bolt, or on the side of a socket head.
There's also a system for stainless bolts (A2, A4, A6, A8).
I think this is all correct, someone fix it if it's wrong.

[KKson]

The grade 5 bolts are equivalent to the 8.8 standard so I was told when I ordered them.

[Rockettvr]

Image of bolt head
Looks like LO top left BO top right and 8.8 bottom
I've found a local engineering supply company and they reckon I I take the bolt down they'll bd able to match it off the shelf as long as its not something really weird and wonderful
Sorry image has rotated

[adam quantrill]

I am buying a set for each side as I had to cut one to get the hub off at the weekend.
Keith where did you get yours? Searching is a nightmare because '1/2"' seems to match everything.... Ebay gives me 5000 hits all the wrong size....

[adam quantrill]

Perseverance eventually paid off I found some with spalding_fasteners on the flea, at a reasonable price.

Search for: 1/2" UNC High Tensile Zinc 8.8 Grade 5 Full & Part Threaded Hex Head Bolts