Thruxton Sheered rear shock bolt

Oh dear Kev.
The shocker bolts should not be overtightened because all you are doing is crushing the rubber bush.
They should be thread locked with Loctite or similar threadlock adhesive and correctly torqued.
A small blob of paint then applied to visually keep on eye on them for vibration loosening which virtually never happens.
Now the damage is done, best to contact a reputable fixings/fasteners supplier and give them the sizes and any other information on the bolt head.
You need high tensile bolts grade 12.9 from memory.

 

Hi Kev,
You are certainly not the first and definitely will not be the last to make this mistake, so do not be too hard on yourself.
There are times when I have totally ignored a torque wrench setting because it just does not feel right from experience.
Onwards and upwards, source some bolts, fit them and put it down to experience.
Ps. Make sure they are high tensile 12.9 grade bolts, use threadlock adhesive and correct torque setting.

 

Spot on ade!! Look here Less than £2 and if you order from your local triumph shop you'll save on postage and get a cup of tea! So all in all a winner?

 

Bearing in mind that the 'strain' is taken on the spigot which supports the shock and the bolt is only there to retain the shock on the spigot - I would have thought stainless bolts would be fine with correct torquing and some Loctite.

 

The speed of reply is brilliant, when you consider it is being done for no gain whatsoever other than helping a fellow biker, marvellous!
Stainless button screws will be fine providing the pitch is 1.25mm, you will need a hexagon bit to fit your torque wrench.
Big Lad is completely right, as the screw is not directly taking the load it is under no threat of fracture and is merely stopping the shocker from working itself off the spigot, hence low torque requirement and the threadlock.
Button heads will look nice, make sure you refit the correct washers which clamp on the rubber inserts.
Just as a reminder, stainless is a more 'brittle' material than the high tensile materials so bear this in mind if it is a tougher more resilient bolt you need that will not crack or fracture under load or tightening.

 

I like your pun 'shocked'
You probably know this, standard spanner and hexagon key lengths are designed so that under 'normal' hand pressure they will only let you apply the leverage intended for that size of fixing, start using a pipe and you stand a good chance of damaging the fixing, tighten it like a fairy and it wont be tight enough. Experience is the key and a good way to practice is tightening something in a vice with a normal spanner and then check what torque it is, quite surprising results sometimes particularly over a range of sizes, materials and thread types.

 

Re torque wrench I recommend Norbar. Great quality and easy to read. (I calibrate torque wrenches for aircraft industry).

 

I had read somewhere that Halfords professional range is made by the same company who make Norbar, can you confirm that ?

 

Not to my knowledge. I think that is just internet talk or wishful thinking

 

Yup. Torque wrench purchase time.

 

Kev, what are you tightening them with, a frigging scaffolding pole ?
If you have not got a torque wrench they only need tightening until it just starts to crush the rubber bushes. With the threadlock adhesive they will be okay, just mark with a blob of paint for a visual check that they remain in place.
If you feel you have not overtightened them it may be that the bolts are shite imports made from monkey metal.

 

Kev, take your time now to correct it or you may cause more damage out of frustration and anger.
Stop for tonight, have a few pints and tackle it in the morning.
Small drill hole in centre and left hand stud extractor.

Once you get it out you need to run a tap down the thread to clean the thread up.
Fingers crossed it is not too damaged from forcing the new bolt in.
If any of the other threads feel tight, run the tap down all of them.
Use a little bit of cutting fluid or thin oil when re-tapping.
Good luck