301/401 mounting bolt size?

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Wire Nut
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301/401 mounting bolt size?

Post by Wire Nut » 07 Jan 2019 21:01

I am building a table for a friend with a solid slate plinth. The mounting bolts need to be 4" and the stock ones are too short. I took one to Fastenall but they could not match the size or thread. Could one of you help me out with the size and thread of these headless bolts?

dave999
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Re: 301/401 mounting bolt size?

Post by dave999 » 09 Jan 2019 11:09

believe they are 1/4 BSF a british fine thread

if using plain stud or bolts with heads cut off do not be tempted to tighten them more than finger tight into the chassis.
better slightly snugged up and the nut on the other end done up reasonably tight than crack the mounting boss in the chassis

originals had a C/E clip round to stop you bottoming them out in the hole

https://www.ebay.co.uk/itm/BSF-Threaded ... :rk:2:pf:0

or these guys

https://www.namrick.co.uk/

you should buy a 1960s raleigh bike and visit fastnall as well.
They will be nonplussed in the extreme when they can fasten nothing on that... :)

We (UK) have the same problem these days finding UNC and UNF or certain US-centric pipe threads, you are stuck with metric fastners at anything but specialists these days here in the UK.

You need a proper shop with an old fella behind the counter in a brown shop coat, who remembers that the last time anyone purchased some of them was 1962.... when everything was wrapped in waxed paper and the till was still mechanical.


believe some of the other fasteners used in the deck are BA machine screws


Dave

Wire Nut
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Re: 301/401 mounting bolt size?

Post by Wire Nut » 09 Jan 2019 20:24

Thanks a bunch- this is the bad boy they are going into:
Keiths.jpg
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Bozo73
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Re: 301/401 mounting bolt size?

Post by Bozo73 » 10 Jan 2019 15:33

I purchased a die to make 1/4 BSF studs out of conventional bolts with US threads on the other end. That way I can make the plinth as thick as I want. The die was about $26 off eBay and the bolts were less than 20 cents apiece.
FWIW
Bob

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Re: 301/401 mounting bolt size?

Post by Zebbo » 05 May 2019 09:06

I thought they were 0BA

Bozo73
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Re: 301/401 mounting bolt size?

Post by Bozo73 » 07 May 2019 16:36

BFS is correct.

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