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Author Topic: Bonnet stay and door screw/bolt size query  (Read 2936 times)
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mangocrazy
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« on: March 06, 2011, 06:36:04 PM »

I'm intending to replace the cross head countersunk screws that Lancia used on the Beta bonnet and door mounts (possibly elsewhere as well) with some allen bolt/socket screw equivalents. As the car is in France and I can't take one off and measure it, would anybody happen to know the size and length?

I seem to remember they were pretty chunky (M10 or M12), but have no idea of thread pitch and length. Does anyone know?
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HFStuart
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« Reply #1 on: March 06, 2011, 10:46:39 PM »

Thread is M8 std. Head diameter is 15.7mm. There were at least two thread lengths 15mm with a pointed tip and 10mm with a flat tip.

There may be others but those are the two in my desk :-)
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MattNoVAT
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« Reply #2 on: March 06, 2011, 10:48:40 PM »

I can do this but not till next weekend as I'm away on business.

If nobody comes up with the details sooner pls remind me at end of the week.
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MattNoVAT
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« Reply #3 on: March 12, 2011, 11:16:04 AM »

These are M8 with a 1.25 thread pitch

I saved all the good ones from the car I dismantled  (i.e. those that did not have the cross head chewed up)
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1981 2000 Coupe S2/FL
1976 1600 Coupe S1
2007 Ypsilon 1.3 Bi-Colori
mangocrazy
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« Reply #4 on: March 14, 2011, 02:47:01 PM »

Hi Matt,

Thanks for the confirmation. Could you measure the overall length of one of the bolts, please? I think for countersunk screws the dimension to order is from top of head to end of bolt/screw (i.e. overall length) whereas for socket screws or bolts, it's only the length of the shank of the bolt that is measured.
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
MattNoVAT
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« Reply #5 on: March 14, 2011, 07:06:06 PM »

Will do - I'll be home from work in a couple of hours.
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1981 2000 Coupe S2/FL
1976 1600 Coupe S1
2007 Ypsilon 1.3 Bi-Colori
MattNoVAT
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« Reply #6 on: March 14, 2011, 08:57:58 PM »

Overall length is 22mm.

That's total from top of flathead to tip of the tapered end.
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1981 2000 Coupe S2/FL
1976 1600 Coupe S1
2007 Ypsilon 1.3 Bi-Colori
mangocrazy
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« Reply #7 on: March 15, 2011, 10:51:27 AM »

Many thanks Matt. A Google search for 'M8 x 1.25 countersunk stainless 22mm' is underway as we speak...
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
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