Any reason for this specific bolt for the brake arm?

[alexdecker]

Hi all

Replacing some parts for the rear brake of my 550F from 1977. Just got all the parts from CMS and discovered too late that I forgot this part, and attaches the brake arm to the frame:

https://www.cmsnl.com/honda-cb550f2-super-sport-550-four-1977-european-direct-sales_model17122/bolt-stopper-arm_90133286000/

Would there be anything wrong with using a normal bolt and riding with that until my next part order? Feel like it’s a little much doing a part order for just one bolt.

Why does this need a special bolt to begin with? Just to be able to lock it with a pin? Seems to me I could just use a regular bolt the same thickness as the thick part of the original bolt? But as usual, I might be missing the bigger picture, so wanted to hear your opinion in here 

- Alex

[Bryanj]

Its a shouldered bolt so that when the nut is done up tight it can still allow the torsion arm to pivot.
You could probably get away with a collar of the right dimensions and a nylock nut

[McCabe-Thiele (Ted)]

I agree with Bryan for a short term solution, personally I see a split pin as an essential long term safety feature.

[davidcumbria]

If it’s like my 550 k1 it is specially shaped to locate in brake shoe holder. Also it needs a spring clip not a split pin making rear wheel removal easier. Here is a photo of the bolt. You might want to look at your backplate because a hex head wouldn’t fit - but the 500f might be different.

https://www.cmsnl.com/honda-cb550-k1-four-1975-usa_model466/bolt-rear-brake_90127323000/

[McCabe-Thiele (Ted)]

I think were talking about two different pivots in the rear brakes.

[davidcumbria]

Yes I’ve highlighted the brake end not the frame end.

[alexdecker]

Thanks guys. I will try and do an intermittent solution until I make my next part order, and save a bit of money and the environment then

[Bryanj]

Try your local dealer, its probaably still available