Radiator support carriage bolt size? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

arkracing · 03-17-2005, 12:24 AM

need the length and thread size so i can buy so new carriage bolts for my '69 support

anybody know what they should be?

I looked in LMC figuring they have nice exploded views...but no bolt size

Thanks

arkracing · 03-17-2005, 07:59 AM

ttt

JimKshortstep4x4 · 03-17-2005, 08:07 AM

The carriage head bolts are 7/16-14 x 3" long.

Jim

arkracing · 03-17-2005, 08:09 AM

Thanks, greatly appreciated....
hard to measure them when they aren't there

JimKshortstep4x4 · 03-17-2005, 08:47 AM

It is a real trick to measure them when they are missing!

Jim

BubbaGreen · 03-17-2005, 09:58 AM

Look for Grade-5 carriage bolts....and try to find compression nuts or at the very least nyloc nuts. The double nut trick works too. Also, there is a square washer that the carriage bolt goes in and it has a square knockout that prevents the bolt from turning, might want to look for these or make something similiar.

**raggedjim** · 03-17-2005, 11:43 AM

Unless you're going for a 100% restore I would lose the carriage bolts and replace them with grade 5 hex head. Nothing is more frustrating than trying to remove a carriage bolt that keeps spinning. I know it may not be an issue for 20-30 years, but I like to think my trucks will still be around then!

Rg

03-17-2005, 12:24 AM	#1
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	Radiator support carriage bolt size? need the length and thread size so i can buy so new carriage bolts for my '69 support anybody know what they should be? I looked in LMC figuring they have nice exploded views...but no bolt size Thanks __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered

03-17-2005, 07:59 AM	#2
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	ttt __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered

03-17-2005, 08:09 AM	#4
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	Thanks, greatly appreciated.... hard to measure them when they aren't there __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered

03-17-2005, 09:58 AM	#6
BubbaGreen Senior Member Join Date: Mar 2001 Location: Cedar Park, TX Posts: 686	Look for Grade-5 carriage bolts....and try to find compression nuts or at the very least nyloc nuts. The double nut trick works too. Also, there is a square washer that the carriage bolt goes in and it has a square knockout that prevents the bolt from turning, might want to look for these or make something similiar. __________________ 71 Chevy C-10 SWB Fleetside RamJet-350/4L60e & Compushift/3.73Posi See it at www.prismnet.com/~grzanich

03-17-2005, 11:43 AM	#7
raggedjim Senior Member Join Date: Jun 2002 Location: Murray, Kentucky Posts: 3,476	Unless you're going for a 100% restore I would lose the carriage bolts and replace them with grade 5 hex head. Nothing is more frustrating than trying to remove a carriage bolt that keeps spinning. I know it may not be an issue for 20-30 years, but I like to think my trucks will still be around then! Rg __________________ Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203

03-17-2005, 08:07 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The carriage head bolts are 7/16-14 x 3" long. Jim

03-17-2005, 08:47 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	It is a real trick to measure them when they are missing! Jim



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