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Bolt question

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Bolt question
#1
Ghheath Silver Member Gregg Heath
Murray, KY, USA   USA
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1951 MG D-Type Midget "Green Hornet"
A friend brought me a carriage bolt from a Rolls Royce. It connects the headlight bracket to the fender. I measured it with a Whitworth thread gauge and it appears to be 55 degree pitch and 26tpi.

2 questions…..does that sound right and where would one get a nut for it? It’s either 7/16 or 1/2 diameter.

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Re: Bolt question
#2
MG-TC ROGER FURNEAUX
LIFTON, DEVON, UK   GBR
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1946 MG TC
1981 MG MGB
hi Greg - that sounds like a special: the only 26tpi BSF thread is 1/4" so this is a fine thread. You are unlikely to find one (but ask any RR forums for possible suppliers): here in Olde England we could make one. Is there a nut for the other side you could measure?

Roger
TC0978

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Re: Bolt question
#3
Buckdendave David Hill
St Neots, Cambridgeshire, UK   GBR
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1954 MG TF
The nearest that I can think of is British Standard Brass (which isn't a Standard at all) and had a Whitworth thread form and was 26tpi at all sizes.
Dave H

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Re: Bolt question
#4
Ghheath Silver Member Gregg Heath
Murray, KY, USA   USA
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1951 MG D-Type Midget "Green Hornet"
Thanks for the reply!

The bolt is a carriage bolt so no opposing head. I measure it roughly at 7/16 or 1/2 and about 4 inches.


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Re: Bolt question
#5
raklefratz Corwin (Corky) Guenther
Lenoir, NC, USA   USA
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1949 MG TC
1967 MG MGB MkI
My guess is that it might be British Standard Cycle. Also 26 TPI. Check britishfasteners.com for nuts. Found a couple on the TC. Windshield pivot studs if memory serves.

Corky


A poor workman blames his tools

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Re: Bolt question
#6
Buckdendave David Hill
St Neots, Cambridgeshire, UK   GBR
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1954 MG TF
British Standard Cycle runs at 60degr and not 55degr per Whitworth form.
Dave H

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Re: Bolt question
#7
raklefratz Corwin (Corky) Guenther
Lenoir, NC, USA   USA
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1949 MG TC
1967 MG MGB MkI
OOPS.
Corky


A poor workman blames his tools

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Re: Bolt question
#8
Mervo Merv Hyde
Peregian Beach, Queensland, Australia   AUS
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I was just about to suggest that it is a Cycle thread. I found one similar recently for my car. https://www.classicfasteners.com.au/stainless-4/


Merv Hyde
Queensland Australia
MG TF 1500
Porsche 356B (S) 1962
Porsche 911 Carrera 1988

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Re: Bolt question
#9
Ghheath Silver Member Gregg Heath
Murray, KY, USA   USA
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1951 MG D-Type Midget "Green Hornet"
It appears that Buckdendave is correct and it’s BSB.

I’ve been in contact with British Tools and Fasteners and they only carry the tap we could use to cut our own.

We’ll start searching the Rolls forums before we go that route.

Thanks for everyone’s help and input.

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Re: Bolt question
#10
oleanderjoe Avatar
oleanderjoe Platinum AdvertiserAdvertiser Joseph Baba
Fresno, CA, USA   USA
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1962 Triumph Spitfire 4 (MkI) "SPITTY"
BUY: Two Imperial carriage bolts, and nuts, and change both sides. Only part you see id the head. I promise NOT to tell. smileys with beer


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Joe Baba 2021


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