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SP250 spare wheel retaining bolt

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Paulkennedy
Posts: 84
Joined: Fri Feb 12, 2016 11:01 pm

SP250 spare wheel retaining bolt

Post by Paulkennedy »

Please what is the thread size of the bolt that holds the spare wheel in place in the boot.
Thanks
Paul

daimlersteve
Posts: 399
Joined: Wed Mar 09, 2016 11:20 am

Re: SP250 spare wheel retaining bolt

Post by daimlersteve »

Have seen all manner of threads there , Memory says 1/2" bsf ( could be wrong here though )

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Vortex O'Plinth
Posts: 946
Joined: Fri Feb 12, 2016 8:15 pm
Location: Gloucestershire

Re: SP250 spare wheel retaining bolt

Post by Vortex O'Plinth »

daimlersteve wrote:
Mon May 20, 2019 10:52 pm
Have seen all manner of threads there , Memory says 1/2" bsf ( could be wrong here though )
Not quite, it's ½" - 20 UNF.
Capture.JPG
Nick

"Don't bother with the Air & Space Museum - there's nothing to see.......".

daimlersteve
Posts: 399
Joined: Wed Mar 09, 2016 11:20 am

Re: SP250 spare wheel retaining bolt

Post by daimlersteve »

look at the size of that bolt head. True steam engine sizing. (probably left over from the War. )

Ian Slade
Posts: 533
Joined: Sat Feb 13, 2016 9:54 am
Location: Scotland

Re: SP250 spare wheel retaining bolt

Post by Ian Slade »

They were specials for spare wheels as the cup was dished and the standard bolt head allowed the wheel brace to slip off, can't remember what the original spanner was for wire wheels as I had a spider brace when I swapped hubs.
Owner since the 70's, Genghis is slightly to my left.

Paulkennedy
Posts: 84
Joined: Fri Feb 12, 2016 11:01 pm

Re: SP250 spare wheel retaining bolt

Post by Paulkennedy »

Thank you for your replies. I would like to find a long enough bolt to prevent the wire wheel jumping around in the boot well. I tried packing the wheel but it is only the board above it and the two flimsy turn latches that keep it down which don't have enough strength, so I will toddle along to my local nut and bolt man.
Thanks Paul

Ian Slade
Posts: 533
Joined: Sat Feb 13, 2016 9:54 am
Location: Scotland

Re: SP250 spare wheel retaining bolt

Post by Ian Slade »

If you can get a long enough bolt in UNF weld a nut to the bolt head, if you can't get a length of UNF stud bar and weld two nuts to the end and grind a taper to the bottom end, easier to locate ther captivated nut without cross threading.
Owner since the 70's, Genghis is slightly to my left.

peterbee
Posts: 26
Joined: Wed Oct 25, 2017 11:37 pm
Location: Dunfermline Scotland

Re: SP250 spare wheel retaining bolt

Post by peterbee »

The bolt for the 4J steel rim is a 4 1/2" x 1/2" UNF - 20tpi. Head size 13/16" - use a plug socket. The plain shank length is 2 1/2". You can buy a standard bolt but the plain shank length is 3 1/4" so you may have increase the thread length depending on your rim size.

Paulkennedy
Posts: 84
Joined: Fri Feb 12, 2016 11:01 pm

Re: SP250 spare wheel retaining bolt

Post by Paulkennedy »

Thanks for the latest suggestions, I had thought to buy a couple of bolts if nesessary cut the head off one and weld together. I will see what bolts are available.
Paul

daimlersteve
Posts: 399
Joined: Wed Mar 09, 2016 11:20 am

Re: SP250 spare wheel retaining bolt

Post by daimlersteve »

Ah, that may have prompted my confusion -- Big head ( 13/16" ) socket size -- 3/4" being the normal for 1/2"thread.
Clearing out the workshop in prep for the blue printing of the big engine . and a gearbox rebuild before a body arrives on Sat for fettlin prior to paintshop delivery
Steve

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