My bolts might be for the center flange.
They are yours if you want them. I have a couple of other pieces from the 1750 driveshaft,Ed, if he doesn't I would like them if available! My 71 spider dream project is missing these bolts and the nuts that go with them. Do you have other parts that you salvaged? Here is my thread---
"After months of preparation, practice and planning, the season's race championship can rely on just one fastener doing its job. If that fastener shears or loosens, the whole race can be lost—not to mention valuable machinery and perhaps even lives."
Carroll's previous books were"Failure does not have to happen. If the persons responsible for the design, installation and maintenance of the equipment had done their job properly, it could have not happened. If the persons responsible for maintenance had read—and understood—this book, it probably would not have."
They do have great selection. I talked to them and many other specialty fastener places, went through bunch of catalogs and it seems like non of the major manufactures/suppliers have these bolts. Talking to them convinced me that proper cutting and threading of bolts is a good alternative, often done even in aeronautics.This is my domestic "go-to" site for replacement metric bolts, nuts, and washers used in automotive applications:
They carry the hard to find "Belleville" and "Wave" washers that are used throughout the Alfas, as well as class 8.8 and 10.9 bolts in coarse, fine and extra fine threads.
Most of their hardware is available in Yellow or White Zinc plating, but they offer a lot of Stainless too.
Funny you mentioned this, few month ago started to read Drive to win and practicing a little bit. I will get that book, sounds interesting.Using the correct fastener in the correct way is a big subject. Carroll Smith wrote "Nuts, Bolts, Fasteners and Plumbing Handbook".
Carroll's previous books were
Prepare to Win
Tune to Win
Engineer to Win
Drive to win
He wanted to name the fasteners book Screw to Win but the publisher vetoed it. They are all worth reading.
The 71 Spider uses 9 mm flange bolts. Be sure to get the right ones.Ed, if he doesn't I would like them if available! My 71 spider dream project is missing these bolts and the nuts that go with them. Do you have other parts that you salvaged? Here is my thread---http://www.alfabb.com/bb/forums/spider-1966-up/478889-my-dream-s2-spider.html
Alfa bolt, part number 2100.20042 fits all 1750's plus certain 1300's and 1600's.
Part number # 2100.20218 fits all 2000's plus certain models of 1300's and 1600's.
Nut # 2120.20044 goes with bolt # 2100.20042
Nut # 115.09.01.168.00 goes with bolt # 2100.20218.
The same nuts are bolts are listed for both the center flange and the rear flange.
I would check with DiFatta Brothers and/or John Norman Alfa Parts for availability.
Good to know Joe, so we got one Giulietta's bolt. Do these have matching M8 nuts with 14mm heads?The 4F identifies the fastener manufacturer, in this case Fontana SA.
The part you marked as "B", with its 14 mm head, is a 750/101 era bolt, while the others are later. It matches the bolts on my 1960 Giulietta Spider.
I don't know if Alfa ever used Lobos in this location.
The probability of shearing the bolts may be low but the consequences could be serious. RISK = PROBABILITY * CONSEQUENCE
What if one added a bracket, made out of bottom horizontal part of the center bearing support few inches behind of the original. Would this be enough to stop front shaft from dropping all the way down and causing a catastrophy?Nakagtv:
As Andrew points out, failures in this area are rare. But as alfaparticle points out, if your front flange did fail, allowing the shaft to whip, the result could be serious.
That is no doubt the reason for the removable cross member under the front section. One ABB member came close to having his leg amputated when the Giubo let go.What if one added a bracket, made out of bottom horizontal part of the center bearing support few inches behind of the original. Would this be enough to stop front shaft from dropping all the way down and causing a catastrophy?