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CB400 Bolt Pitch

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waffey:
Hi,

Q1. might be a stupid question but are all the bolts around the frame and fixtures all a standard metric pitch? I was thinking of buying a bagful or two before the build so I have the various sizes to hand.

Q2. Zinc plated or stainless

thanks in advanced

Nurse Julie:
A1) Would it be possible for you to have the bolts that were fitted re zinced? There are soooo many different sizes and lengths and also some special bolts, it just may be a cheaper if not easier way of you getting what you need. A2) Zinc.

PatM:

--- Quote from: waffey on March 13, 2019, 03:34:52 PM ---Hi,

Q1. might be a stupid question but are all the bolts around the frame and fixtures all a standard metric pitch? I was thinking of buying a bagful or two before the build so I have the various sizes to hand.



--- End quote ---

I read this and remember with horror when many years back- 25 probably- I put the wrong lower engine-bolt - ie , too long- and it picked up the captive nut but then with my enthusiastic tightening- drove it right through the lower casing/crank-case!! (LH side, if yourve wondering..)
Now, I know this is slightly off-topic, but I thought Id mention it because in those days, there were plenty of scrap 400/4 motors around for £30-50 quid, but now, not so!

mike the bike:
Yup, I did the exact same thing.  The starboard bolt is 2mm shorter than the port side.  Don't forget the washers either, otherwise the effective bolt length will be too long.

K2-K6:
Honda routinely use more or less bespoke bolts on many applications,  you really have to be quite careful if you are to replace any.

Friend had an XR500 that had one (or two) 9mm bolts in the head!

You sometimes get odd things from very competent engineering designs though.  Mercedes cars fitted with alloy wheels and steel spare used to need shorter wheel bolts to fit the spare.  If you used the "alloy" bolts they would trepan a neat groove in the brake caliper from extending too far through the hub.

And Peugeot have used five sided bolts on their brake calipers to prevent tampering in the past.

Just sometimes a specific accuracy gives rise to a unseen fault that the designers didn't spot.

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