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I need a bolt size #1467114
07/13/13 12:06 AM
07/13/13 12:06 AM
Joined: Apr 2007
Posts: 4,233
petaluma,ca. u.s.a.
west Offline OP
master
west  Offline OP
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Joined: Apr 2007
Posts: 4,233
petaluma,ca. u.s.a.
I have a 72 scamp/duster and I need the size for the bolts that hold the front bumper mounts to the frame.

Re: I need a bolt size [Re: west] #1467115
07/13/13 12:11 AM
07/13/13 12:11 AM
Joined: Nov 2007
Posts: 21,808
Kirkland, Washington
Pacnorthcuda Offline
Too Many Posts
Pacnorthcuda  Offline
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Joined: Nov 2007
Posts: 21,808
Kirkland, Washington
Not positive but before the experts post I'm gonna say 7/16

Re: I need a bolt size [Re: Pacnorthcuda] #1467116
07/13/13 01:05 AM
07/13/13 01:05 AM
Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
kentj340 Offline
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kentj340  Offline
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Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
My 69 A body uses 1/2-13 x 2-3/4 with captive conical 1-1/4 washer, maker's mark "38". Similar to part B-10924 on page 114 except longer at this link:

http://www.amkproducts.com/Catalog_PDF.htm


If you don't see two dolphins, you need a vacation.
Re: I need a bolt size [Re: kentj340] #1467117
07/13/13 01:18 AM
07/13/13 01:18 AM
Joined: Apr 2007
Posts: 4,233
petaluma,ca. u.s.a.
west Offline OP
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west  Offline OP
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Posts: 4,233
petaluma,ca. u.s.a.
Quote:

My 69 A body uses 1/2-13 x 2-3/4 with captive conical 1-1/4 washer, maker's mark "38". Similar to part B-10924 on page 114 except longer at this link:

http://www.amkproducts.com/Catalog_PDF.htm



That is a dart I assume. You think they are the same?

Last edited by west; 07/13/13 01:20 AM.
Re: I need a bolt size [Re: west] #1467118
07/13/13 02:15 AM
07/13/13 02:15 AM
Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
kentj340 Offline
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kentj340  Offline
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Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
The AMK catalog is saying B and E bodies used 1/2-13, and my A uses 1/2-13 also, so I'd say try any 1/2-13 bolt and see if it works in your car thread-wise.

IIRC the A body needs a longer bolt than B and E because both the inboard and outboard sides of the box frame are threaded. If both are threaded on your car, check to see if the grip is slightly under 2-3/4. If so and the 1/2-13 is correct, then you need four grade 5.1 (or grade 5 will do) hex head machine screws with conical washers x 2-3/4. Use automotive grade 5 or 5.1, not hardware store grade 2. Length 2-1/2 might work if the grip including the washer is a few threads less than 2-1/2.


If you don't see two dolphins, you need a vacation.
Re: I need a bolt size [Re: kentj340] #1467119
07/13/13 03:21 AM
07/13/13 03:21 AM
Joined: Apr 2007
Posts: 4,233
petaluma,ca. u.s.a.
west Offline OP
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west  Offline OP
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Posts: 4,233
petaluma,ca. u.s.a.
Thanks man. Top notch info.

Re: I need a bolt size [Re: kentj340] #1467120
07/13/13 08:09 AM
07/13/13 08:09 AM
Joined: Mar 2007
Posts: 9,336
South-Central (Sebring), FL
Commando1 Offline
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South-Central (Sebring), FL
Quote:


http://www.amkproducts.com/Catalog_PDF.htm



Thanks for the link!
Best automotive fastener & hardware reference I have yet to see.
Better than Auveco?

Re: I need a bolt size [Re: Commando1] #1467121
07/13/13 11:20 PM
07/13/13 11:20 PM
Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
kentj340 Offline
top fuel
kentj340  Offline
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Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
If your 1/2-13 female threads in the frame of your car are dirty, rusty, or damaged by weld spatter or whatever, you can file a vee in the first few threads of your bolts so that they are cutting like a tap. Make the side of the vee about 90 degrees to tangent in the clockwise turning direction for best cutting. Since the bolt is not nearly as hard as a tap, it won't cut as well as a tap, but usually well enough to get by. The original bolts had "paint cutter lead points" which do the same thing, as shown in the AMK catalog photos of the B and E body bumper arm bolts.


If you don't see two dolphins, you need a vacation.






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