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Author Topic: Battery hold down clamp bolt  (Read 3980 times)
GaryL
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Marilyn and me

gandmal
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« on: November 07, 2007, 12:15:52 AM »

Sorry for this small anal question, but what is the orginal bolt for the battery hold down clamp? The size is 5/16NC but does it have a captured washer and no threads on the end just like a door hinge bolt?
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Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
JohnZ
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« Reply #1 on: November 07, 2007, 11:38:02 AM »

Mine, which I believe to be original, is a 5/16"-18 recessed hex head with a captured conical washer and a reduced-diameter round flat point (we called them "dog-point" bolts in the plant).
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'69 Z/28
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KevinW
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« Reply #2 on: November 07, 2007, 02:22:03 PM »

Nice timing on this! Smiley  John, what size is the captured washer? Thanks!
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GaryL
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« Reply #3 on: November 07, 2007, 03:59:51 PM »

That souinds like what I bought, but the washer has teeth. It lokks exactly like a door hinge bolt.
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Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
Marty
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« Reply #4 on: November 07, 2007, 06:52:46 PM »

I have an original bolt off a 68 full size car that I will look at when I get home. I think the head markings are RBW but I'll double check. I'll try to take an image of it tomorrow.
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Martin Foltz
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68 Van Nuys Camaro
JohnZ
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« Reply #5 on: November 08, 2007, 07:16:17 PM »

Washer is 7/8" in diameter, and it does have serrations ("teeth") on the bottom.
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'69 Z/28
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Marty
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« Reply #6 on: November 08, 2007, 07:27:37 PM »

The one I have also has a 7/8" diameter washer but it doesn't have serrations on the bottom. The length is 1" including the washer.
RBW head marking, grade 5 (three lines). Remember, this is off a 68. Anyone else have an original bolt?
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Martin Foltz
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68 Van Nuys Camaro
GaryL
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gandmal
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« Reply #7 on: November 08, 2007, 08:40:17 PM »

Washer is 7/8" in diameter, and it does have serrations ("teeth") on the bottom.

That's what I thought. It is exactly a door hinge bolt, but the closest they could come. There is no AMK Products listing for the GM part number in the AIM.
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Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
GaryL
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« Reply #8 on: November 08, 2007, 10:08:36 PM »

Wow. I go out to my spare bolt bag and find 2 like you guys describe. If only I had known.
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Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
Dave69x33
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« Reply #9 on: February 11, 2008, 09:39:35 PM »

JohnZ,

What is the marking inside the head?  Is it an "N" like the one shown?

This is AMK's individual bolt kit #G4352, $1.50.  It is also avalible in a set of (6) for $5, item #B-11915.

Its a 5/16-18 x 7/8, 1/2 across the flats, 3/4 conical encapsulated washer, phosphate gray-black color.  It has a "lead point" tread start nose tip w/o treads for about first 1/8".
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JohnZ
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« Reply #10 on: February 12, 2008, 10:17:17 AM »

<<JohnZ,

What is the marking inside the head?  Is it an "N" like the one shown?>>

Here's a photo of the bolt on mine. Although the overall configuration of the bolt is similar to the door hinge bolt, I wouldn't expect them necessarily to have the same headmark - Fisher Body released and purchased the door hinge bolts under their own part number, and Chevrolet released and purchased the battery hold-down bolt under their own part number.
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'69 Z/28
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Pex68
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« Reply #11 on: March 18, 2008, 07:47:29 PM »

John,

See your clamp is painted, is that correct?  I always thought those were phosphate like in Dave's photo.
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Chris P
1968 Sequoia Green SS 396/325 M20
JohnZ
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« Reply #12 on: March 19, 2008, 11:13:56 AM »

John,

See your clamp is painted, is that correct?  I always thought those were phosphate like in Dave's photo.

I suppose they could have been either way, although I've only seen them painted; mine is original to the car.
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'69 Z/28
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Dave69x33
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« Reply #13 on: March 23, 2008, 08:13:03 PM »

I purchased mine hold down clamp from Paragon Corvette Reproductions, Kit Item #1515K, $5.00 which includes bolt Item #1498, "E" head mark.  I must assume there could have been a couple of different bolt head markings uses.
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