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Posted by: Highland Aug 12 2019, 07:08 PM

Was wondering why the door bolts are pointy. Can I replace them with standard M8 X 22 coarse thread bolts? I know they're listed as 27 mm, but I assume that includes the point.

Posted by: Superhawk996 Aug 12 2019, 07:14 PM

In a manufacturing environment pointy or dog head bolts allow power tools to drive the fastener quicker and better with power tools. The point helps the bolt find center quickly and reduces the risk of cross threading without having to hand start bolts.

I have no idea how Porsche assembled back in the day, but, it's likely Hans held the door in position and Franz drove the bolts quickly with an air tool as Hans complained that it was about time to swap jobs and Franz should hold some doors in position.

Probably rough fit to hold in position 1st and tweaked later.

Posted by: TargaToy Aug 12 2019, 07:28 PM

So your bung hole doesn’t slam shut!

Oh, sorry. I thought you asked why turds are pointy...

Posted by: Superhawk996 Aug 12 2019, 07:31 PM

Posted by: bbrock Aug 12 2019, 08:22 PM

Pointy also makes it easier for a one-person door install with a hand socket. The self centering bolt is just what you need to hold the door with one arm and get a bolt started in the top hinge with a socket wrench. Doing that with a regular bolt wouldn't be impossible, but a lot harder and greater chance for cross threading.

Oh - and also so your bunghole doesn't slam shut.

Posted by: mepstein Aug 12 2019, 08:40 PM

https://vwparts.aircooled.net/Floor-Pan-Bolt-Pan-to-Body-Chassis-to-Mounting-p/111-899-145.htm

$.95 each

Posted by: IronHillRestorations Aug 12 2019, 09:49 PM

The reason they have a point is because the nut plate they bolt into floats in it's bracket in the door jamb and the point guides the bolt into the threaded boss in the nut plate.

Posted by: raynekat Aug 12 2019, 10:12 PM

Yeah....I like this answer the best. Whatever floats your bolt!

Posted by: rgalla9146 Aug 13 2019, 04:35 AM

Not on early cars.
For ease of assembly.
Have you seen what fasteners look like in modern cars ?
All are tailored for powered/robotic assembly.

Posted by: Krieger Aug 13 2019, 07:46 AM

Posted by: Superhawk996 Aug 13 2019, 08:52 AM

Spot on.

Modern fasteners are designed for manufacturing. Notice many modern fasteners also have captive washers. Avoids wasted time and lost $$ being scattered on the floor from dropped parts as a line operator tries to put a washer on the fastener. Also ensures they don't forget to put on the washer.

Here's a picture of modern bolt with dog point and a captive washer.

Much less likely to cross thread than the pointed bolt in OP.

Posted by: Mark Henry Aug 13 2019, 06:44 PM

I'm still trying to perfect the perfect pinch.
That's when you pinch off a loaf so cleanly that you don't have to wipe.

TMI

Posted by: TonyA Aug 14 2019, 01:39 PM

Great technique to use while camping!!

Posted by: malcolm2 Aug 14 2019, 02:03 PM

Change your diet

KETO and Atkins..... Lots of cheese and protein.

Posted by: eatpez Sep 11 2019, 07:36 PM

Does anyone know if these bolts are M8x1.00 or M8x125? I pulled them out of my project car and I honestly can't tell for sure with the thread guide. I want to chase the threads in the plates but obviously don't want to screw that up.

The link to the VW chassis bolts shows M8x125 but I'd swear the ones that go back in easily are M8x1.00.

Posted by: eatpez Sep 11 2019, 07:47 PM

Definitely M8x1.25. The passenger side all went in fine. Now for some careful thread restoration....

Posted by: Highland Sep 11 2019, 09:48 PM

Were the original door bolts painted in the car's color or plated?

Posted by: mepstein Sep 12 2019, 04:35 AM

Painted