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D10 Swinging Arm Pin & Bolts - Does this look right to you?
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FitzFortune
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June 27, 2021 - 12:40 pm
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Hi all,

So, I'm slowly amassing the parts I'll need to turn my bare D10 frame into a running Bantam. My plan is to build up a rolling chassis and then look for an engine - hopefully a D10A if I can find one.

My latest purchase is a swinging arm pin and bolts. My frame as purchased had neither of these, in fact there was no swinging arm either, so I've nothing to compare the new items to. The bolts don't screw in to the pin as far as I'd thought they would, so could I ask you guys to please take a look at the attached photos and tell me if you'd expect the bolts to screw in to the pin any further that this?

TIA.

 - Ian (aka Fitz)

Pin-01.pngPin-02.png

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Sponge
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June 27, 2021 - 3:02 pm
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Something not quite right there Fitz. Not sure but the S/A bolts I have are not shouldered. I will check. In any case the bolts should screw right into the spindle. Two different thread forms were specified for swinginv arm models so you may have the wrong bolts or the wrong pin depending on how you choose to look at it. Next time I am in the workshop I will look at some original BSA bolts.........

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cocorico
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mike p5xbx
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June 27, 2021 - 11:44 pm
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the distance between the swingarm and the inner face of the bolt is 15mm when all fitted together
made up of rear frame loop , passenger footrest plate and washer on bolt
looks only just enough in your photo

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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FitzFortune
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June 28, 2021 - 8:31 am
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Thank you all for your input, it's most appreciated.

The bolts screw in to the pin to a depth of 11/16th (~16mm) before they bottom out, with the ends just about level with the outer edge of the grease holes drilled in the pin. That leaves about 5/8th of the bolts proud of the pin, measuring from their inner faces. This is pretty close to the distance quoted by Mike, so maybe it's OK after all?

I know that B175s had a UNF threaded pin and bolts to match, but I bought the earlier type with a 26TPI fine thread. The bolts can be easily screwed in by hand until they bottom out, so I'm fairly sure that the threads do match.

Thanks again.

 - Ian (aka Fitz)

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Sponge
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June 28, 2021 - 8:53 am
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Glad we got that straightened out in the end....I was beginning to doubt my own memory !!

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