Guidoma · Jun 3, 2024

Hello folks Guido here from Downunder.

I have a question or two about the large pivot bolt on the bulkhead which acts as a hinge for the windscreen.

I have one original bolt and nut on the passenger side of the bulkhead pivot but am missing the bolt, nut and washers on the driver's side pivot.

Please see the attached photo of the bolt, nut and washers presently fitted.

Can anybody tell me what the actual size and thread type of the bolt is as well as the specifics of the washer sizes? Also, is it possible to undo the petal type lock nut without damaging the thread or the nut, or do the "petals" need to be opened up before loosening the nut? Are replacement bolts, nuts and washers available for this fixture or should I just replace the bolts place with more modern type fastenings?

I am not after concourse perfection, as long as I can have matching bolts, they fit correctly and do the job

Thanks

Guido

lynall · Jun 3, 2024

The nuts are a version of sinch (spelling) nuts, there are several different types and I would be surprised if you can buy that type new anymore.

tottot · Jun 3, 2024

You can undo and reuse if in good condition. The nylock nut has pretty much taken over from the petal and turret nut.
Some new stainless and some used original on the Ebay. Silly money in my opinion for just two bolts. Given where you are see if an Agriculture machine store would likely have something.

Guidoma · Jun 3, 2024

lynall said:
The nuts are a version of sinch (spelling) nuts, there are several different types and I would be surprised if you can buy that type new anymore.

Thanks for that Lynall. I spent quite some time searching before I sent my post and I would have to say I could not find any nuts similar for sale, even among British speciality suppliers..

Do you think that I would be able to undo the sinch nut like a normal nut, or would it damage the threads on the bolt if I don't open the petals a little? Not that opening the petals would appear to be an easy task.

Guido

lynall · Jun 3, 2024

Guidoma said:
Thanks for that Lynall. I spent quite some time searching before I sent my post and I would have to say I could not find any nuts similar for sale, even among British speciality suppliers..

Do you think that I would be able to undo the sinch nut like a normal nut, or would it damage the threads on the bolt if I don't open the petals a little? Not that opening the petals would appear to be an easy task.

Guido

I would just clean the threads up with a wire brush a little bit of duck oil and wind the nut off. There is no need to open the wing bit at all.

Guidoma · Jun 4, 2024

Hello all

I managed to unbolt the nut and remove the pivot bolt. The is in very good condition. I cleaned several layers of paint from the hex head and the initials stamped into the head indicat the bolt is UNF thread. It is 1/2inch x 1 3/4 inches. It appears to have a sheradised type coating they used way back then.

I have managed to locate a number of fastening suppliers here in Australia who stock 1/2 UNF nuts and bolts, which I am very pleased about. They are available in plain carbon finish, zinc plated or 304 and 316 stainless steel.

Would there be any issue with me using stainless steel replacement bolts? I am thinking about possible galvanic corrosion to the windscreen pivot hole itself, although that is part of the galvanised windscreen frame. Should I be concerned about it or should I go for zinc plated bolts instead?

Thanks Guido.

lynall · Jun 29, 2024

I would say the zimc plated would be stronger than the stainless but either should do the job nicely

Guidoma · Jun 30, 2024

Thank you for that Lynall.

I tried getting zinc plated in the correct length without success, so went for 316 stainless, which are about 1/4 inch longer than the old bolts. I will be using matching 316 nylock lock nuts and a stainless washer on top of the other washers.

Cheers

Guido

lynall · Jun 30, 2024

Guidoma said:
Thank you for that Lynall.

I tried getting zinc plated in the correct length without success, so went for 316 stainless, which are about 1/4 inch longer than the old bolts. I will be using matching 316 nylock lock nuts and a stainless washer on top of the other washers.

Cheers

Guido

Little grease on the threads and you will have no worries.

Stainless is lovely, just dont use any power tools as you will gaul the threads.

Guidoma · Jun 30, 2024

lynall said:
Little grease on the threads and you will have no worries.

Stainless is lovely, just dont use any power tools as you will gaul the threads.

Thanks mate.

I was sent some Tef-Gel, which is an Australian made anti seize grease so will give that a go.

Definately no power tools on these bolts!

Guido

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