Screw size

Discuss Bodywork problems here.
Forum rules
By using this site, you agree to our rules. Please see: Terms of Use
Post Reply
dogoil
Newbie
Posts: 7
Joined: Wed Nov 18, 2009 11:07 am
Location: NRW / Germany
MMOC Member: No

Screw size

Post by dogoil »

Hello,
could someone remind what thread size screws for the seat belt.

Many thanks,
Hans
Top
Dean
Minor Legend
Posts: 2180
Joined: Fri May 30, 2008 9:41 pm
Location: Sutton Coldfield
MMOC Member: No

Post by Dean »

7/16 UNF.... you'll need high strength ones though... not just any mild steel bolt. You don't want them bending or snaping in an emergency. :) Someone should confirm the exact grade..

Just noticed you are in Germany.. they may be metric over there???
My Minor:
A Clarendon Grey 1953 4 Door Series II.
MMOC - 66535


Top
aupickup
Minor Maniac
Posts: 6004
Joined: Tue Jul 20, 2004 11:41 pm
Location: lanark
MMOC Member: No

Post by aupickup »

i think you will find they are the same size as the wing bolts which i think are 5/16 bsf
Top
Dean
Minor Legend
Posts: 2180
Joined: Fri May 30, 2008 9:41 pm
Location: Sutton Coldfield
MMOC Member: No

Post by Dean »

Ahh.... maybe we have two sizes then, mine are the aftermarket belts, I suspect you may be talking about original BMC stock belts?
My Minor:
A Clarendon Grey 1953 4 Door Series II.
MMOC - 66535


Top
taupe
Minor Legend
Posts: 1189
Joined: Sun Oct 26, 2008 3:20 pm
Location: Bucks
MMOC Member: No

Post by taupe »

I think all seatbelt bolt threads are 7/16" UNF as standard.

The ones in my traveller sill and door piller certainly are and I have used bolts from a modern GMC car which are a perfect fit for the thread.
Top
aupickup
Minor Maniac
Posts: 6004
Joined: Tue Jul 20, 2004 11:41 pm
Location: lanark
MMOC Member: No

Post by aupickup »

sorry read it wrong, thought it said seat base

ah yes seat belt are 7/16
Top
dogoil
Newbie
Posts: 7
Joined: Wed Nov 18, 2009 11:07 am
Location: NRW / Germany
MMOC Member: No

Re: Screw size

Post by dogoil »

[quote="dogoil"] Thanks all, for help. Should be 6/17 UNF.
Hans
Top
dogoil
Newbie
Posts: 7
Joined: Wed Nov 18, 2009 11:07 am
Location: NRW / Germany
MMOC Member: No

Re: Screw size

Post by dogoil »

[quote="dogoil"]

Sorry 7/16 UNF.
Hans
Top
Alec
Minor Legend
Posts: 2148
Joined: Thu Apr 15, 2004 7:29 am
Location: Oswestry, Shropshire
MMOC Member: No

Post by Alec »

Hello hans,

Yes that's right, but most seat belt bolts have a very shallow head, i.e. they are specials.

Alec
Top
bmcecosse
Minor Maniac
Posts: 46561
Joined: Wed Feb 16, 2005 11:24 pm
Location: ML9
MMOC Member: No

Post by bmcecosse »

No special reason for that though - it's just to keep them 'neat' - and if bolting right through a panel with a nut on the back - the thread really doesn't matter. Only important if screwing in to a fixed mount.
ImageImage
Image
Top
Alec
Minor Legend
Posts: 2148
Joined: Thu Apr 15, 2004 7:29 am
Location: Oswestry, Shropshire
MMOC Member: No

Post by Alec »

Hello BMCE,

" Only important if screwing in to a fixed mount."

Which is what they normally are.
It has to be a very old car that requires a new installation of seat belts.
The shallow head is generally because of limited space, as in where the main unit has to accommodate the coiled belt and fixed units being capped with a plastic cover, as you say to keep it neat. But needed nevertheless.

Alec
Top
Post Reply

Return to “Bodywork”