That other new guy
Fleet Mechanic
Joined: Aug 2010
Posts: 1,994
Likes: 3
From: Morgan Hill, CA
I'm pretty sure that they are plain old 5/16 bolts....with fine threads (so 5/16-24 UNF). A lot of the body parts on these trucks was bolted together with 5/16 fine thread bolts....there are a few places with 3/8" bolts...like the bolts that hold the inner fender to the radiator support...those are also fine thread bolts.
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Junior User
Joined: Sep 2011
Posts: 57
Likes: 0
From: Auburn, AL
I'm pretty sure that they are plain old 5/16 bolts....with fine threads (so 5/16-24 UNF). A lot of the body parts on these trucks was bolted together with 5/16 fine thread bolts....there are a few places with 3/8" bolts...like the bolts that hold the inner fender to the radiator support...those are also fine thread bolts.
Lead Driver
Joined: Dec 2004
Posts: 7,669
Likes: 13
From: San Jose, CA
Just as I suspected, and remembered, the bolt is of special construction. It has a mushroom tip at the bottom in order to engage the hood latch.
As per the parts manual (see pictures below), it's part # 1C-16929 and is 3.66" long. The 48-50 uses the same bolt, but it's 5" long and has a part # 7C-16929. The 48-50 also utilizes a separate 7/16"-20 nut. The nut on a 51-52 hood assembly is welded to the hood. I would assume that it's also a 7/16"-20 thread.
I doubt that you'll find this special bolt at your local hardware or auto parts store. If you're set on finding an original, then I suggest trying Green Sales Co in Ohio and/or Antique Auto Supply in Arlington, TX. Otherwise, I'd spend the money and have the existing bolt re-threaded to the correct specs.
As per the parts manual (see pictures below), it's part # 1C-16929 and is 3.66" long. The 48-50 uses the same bolt, but it's 5" long and has a part # 7C-16929. The 48-50 also utilizes a separate 7/16"-20 nut. The nut on a 51-52 hood assembly is welded to the hood. I would assume that it's also a 7/16"-20 thread.
I doubt that you'll find this special bolt at your local hardware or auto parts store. If you're set on finding an original, then I suggest trying Green Sales Co in Ohio and/or Antique Auto Supply in Arlington, TX. Otherwise, I'd spend the money and have the existing bolt re-threaded to the correct specs.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
They really aren't that different from dozens of other vehicles that use that kind of latch. The head on mine measures 1-1/8" diameter at the widest part, and the bolt needs to stick down from the underside of the hood at least 2-1/4", so is probably a 3" overeall length. It's useless without the spring and cup to match tho, so grab them too.
Lead Driver
Joined: Dec 2004
Posts: 7,669
Likes: 13
From: San Jose, CA
How much are they charging? It's probably less than the time it would cost you to find one. Check the thread inside the nut. Maybe it's bad as well.
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