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> Why are Door Bolts Pointy?, P/N 111899145
Highland
post Aug 12 2019, 07:08 PM
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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.

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Superhawk996
post Aug 12 2019, 07:14 PM
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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. (IMG:style_emoticons/default/happy11.gif)

Probably rough fit to hold in position 1st and tweaked later.
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TargaToy
post Aug 12 2019, 07:28 PM
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So your bung hole doesn’t slam shut!

Oh, sorry. I thought you asked why turds are pointy...
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Superhawk996
post Aug 12 2019, 07:31 PM
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bbrock
post Aug 12 2019, 08:22 PM
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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. (IMG:style_emoticons/default/happy11.gif)
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mepstein
post Aug 12 2019, 08:40 PM
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https://vwparts.aircooled.net/Floor-Pan-Bol...111-899-145.htm

$.95 each
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IronHillRestorations
post Aug 12 2019, 09:49 PM
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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.
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raynekat
post Aug 12 2019, 10:12 PM
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QUOTE(IronHillRestorations @ Aug 12 2019, 08:49 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.


Yeah....I like this answer the best. Whatever floats your bolt!
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rgalla9146
post Aug 13 2019, 04:35 AM
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QUOTE(Highland @ Aug 12 2019, 09:08 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.

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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.
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Krieger
post Aug 13 2019, 07:46 AM
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Superhawk996
post Aug 13 2019, 08:52 AM
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QUOTE(rgalla9146 @ Aug 13 2019, 06:35 AM) *

QUOTE(Highland @ Aug 12 2019, 09:08 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.

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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.


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.

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Mark Henry
post Aug 13 2019, 06:44 PM
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QUOTE(TargaToy @ Aug 12 2019, 09:28 PM) *

So your bung hole doesn’t slam shut!

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

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 (IMG:style_emoticons/default/confused24.gif)
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TonyA
post Aug 14 2019, 01:39 PM
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QUOTE(Mark Henry @ Aug 13 2019, 08:44 PM) *

QUOTE(TargaToy @ Aug 12 2019, 09:28 PM) *

So your bung hole doesn’t slam shut!

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

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 (IMG:style_emoticons/default/confused24.gif)


Great technique to use while camping!!
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malcolm2
post Aug 14 2019, 02:03 PM
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QUOTE(Mark Henry @ Aug 13 2019, 07:44 PM) *

QUOTE(TargaToy @ Aug 12 2019, 09:28 PM) *

So your bung hole doesn’t slam shut!

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

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 (IMG:style_emoticons/default/confused24.gif)


Change your diet

KETO and Atkins..... Lots of cheese and protein.
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eatpez
post Sep 11 2019, 07:36 PM
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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.
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eatpez
post Sep 11 2019, 07:47 PM
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QUOTE(eatpez @ Sep 11 2019, 09:36 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.



Definitely M8x1.25. The passenger side all went in fine. Now for some careful thread restoration....
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Highland
post Sep 11 2019, 09:48 PM
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Were the original door bolts painted in the car's color or plated?
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mepstein
post Sep 12 2019, 04:35 AM
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QUOTE(Highland @ Sep 11 2019, 11:48 PM) *

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

Painted
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