lug nut size? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Earl Filter · 06-18-2005, 01:42 AM

Would my truck ('77 C20) have 1/2in or 9/16 lugs? If it helps, I have to use a 7/8 socket on the lug nuts. I'm looking to buy some double-threaded nuts so I can use Chevy centercaps with my new Hummer H2 wheels.

u2slow · 06-18-2005, 01:50 AM

9/16"

The 1/2" studs on 8-lug trucks was abandoned around '71 or so.

Might have a hard time with those external threaded lug nuts... the OE ones are metric.

screwballl · 06-18-2005, 01:51 AM

lets see 7/8 should be 9/16... and 9/16 socket if i remember right is usually 1/2

Earl Filter · 06-18-2005, 10:32 AM

Quote:

Originally Posted by u2slow

9/16"

The 1/2" studs on 8-lug trucks was abandoned around '71 or so.

Might have a hard time with those external threaded lug nuts... the OE ones are metric.

The ones I'm looking at are replacements for using new wheels on the old trucks. They have a set of 32 on ebay for $39.95 + $9 shipping. I don't think I can beat that.

Thanks for your replies!

TexasJeff · 06-21-2005, 04:42 PM

The right lug nuts are the 9/16, I bought the same ones for my truck, got them from ebay also, was the best deal I could find anyplace.

Scrubby · 06-21-2005, 05:29 PM

The lug nuts you need are talked about in this write up:

http://www.gmtrucks.org/wiki/faq/8_lug_wheels

I got them at a local wheel place for really cheap, but you can get them here:

www.ezaccessory.com

06-18-2005, 01:42 AM	#1
Earl Filter Registered User Join Date: May 2005 Posts: 212	lug nut size? Would my truck ('77 C20) have 1/2in or 9/16 lugs? If it helps, I have to use a 7/8 socket on the lug nuts. I'm looking to buy some double-threaded nuts so I can use Chevy centercaps with my new Hummer H2 wheels. __________________ Real Name - Brandon Current Vehicles: 1977 C20 Silverado 454/TH400 3.73s 1989 Jaguar XJ6 in the middle of an LT1/4L60E swap

06-18-2005, 01:50 AM	#2
u2slow Web Wheeler Join Date: Jan 2000 Location: BC, Canada, eh? Posts: 388	9/16" The 1/2" studs on 8-lug trucks was abandoned around '71 or so. Might have a hard time with those external threaded lug nuts... the OE ones are metric. __________________ '66 C10 longstep - Clifford equiped '84 C20 Suburban 6.2L - awaiting 4x4 conversion '91 V3500 Crewcab - awaiting diesel swap

06-18-2005, 01:51 AM	#3
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,755	lets see 7/8 should be 9/16... and 9/16 socket if i remember right is usually 1/2 __________________ 91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. -------------------

06-21-2005, 04:42 PM	#5
TexasJeff Don't Crush em Restore em Join Date: Aug 2004 Location: Pinehurst, Texas Posts: 764	Lug Nuts The right lug nuts are the 9/16, I bought the same ones for my truck, got them from ebay also, was the best deal I could find anyplace. __________________ TexasJeff 2009 Silver with Linen Interior Cadillac DTS 1990 Red with White Top and Interior Ford Mustang GT convertible 1998 Red with Gray Interior, C3500 Chevy Crew Cab Dually

06-21-2005, 05:29 PM	#6
Scrubby Check out GMTrucks.org Join Date: Sep 2003 Location: Boise, Id Posts: 284	The lug nuts you need are talked about in this write up: http://www.gmtrucks.org/wiki/faq/8_lug_wheels I got them at a local wheel place for really cheap, but you can get them here: www.ezaccessory.com



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