Seat bolt size and thread pitch? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*vegaschevy* · 08-17-2009, 02:26 PM

I dont have seat bolts for my truck. What size is the bolt and what thread is it? Also is it a standard bolt or is it special? any pics of them?

my67chevytruck · 08-17-2009, 03:47 PM

they look similar to the cowl bolts. I believe its the same size as well. Pull a bolt from the side of the windshield cowl and see if it matches

71 super · 08-17-2009, 03:47 PM

5/16 coarse thread

*vegaschevy* · 08-20-2009, 08:31 PM

Quote:

Originally Posted by 71 super

5/16 coarse thread

THank you sir, Ill have to pick some up. ANyone know how long? 3/4"? 1"?

my67chevytruck · 08-20-2009, 10:06 PM

i believe 3/4. dont have any infront of me at the moment. the 1" will work as well as there are no stops etc. to keep from sinching down.

red71c10 · 08-20-2009, 10:19 PM

I bought new bolts for my seat from LMC and they worked perfectly.

sleepertruck72 · 08-20-2009, 11:02 PM

I pulled two and they were 5/16" at the threads, 3/4" long, but I dont have a pitch gauge...

*vegaschevy* · 08-20-2009, 11:30 PM

Quote:

Originally Posted by sleepertruck72

I pulled two and they were 5/16" at the threads, 3/4" long, but I dont have a pitch gauge...

Good enough for me

1969stepside · 02-20-2024, 01:14 PM

are the bolts for the bucket seats the same as the bench seat bolts?

**71CHEVYSHORTBED402** · 02-20-2024, 02:05 PM

If you mean the bench seat brackets to seat and floor, (GR 5) 1/2" hex recessed head tapered bolts with spin washers. The bolt threads are 5/16-18 x 7/8" under the spin washer, and the heads are stamped RBM.

**Steeveedee** · 02-20-2024, 11:09 PM

^ What is a "spin washer"?

**71CHEVYSHORTBED402** · 02-20-2024, 11:25 PM

Quote:

Originally Posted by Steeveedee

^ What is a "spin washer"?

Here's a whole bunch of them before refinish. Integrated. You know, the washer that spins around under head but won't pull off. Most are flat washers, some star washers, some split washers. Tooth washers for headlight grounds.

Basically my bench seat bolts are 1" long under head, but 7/8" - ish under the spin flat washer. According to my truck, similar bolts are often 3/4" under the spin washers. Those for my bench seat a pinch longer.

1969stepside · 02-21-2024, 09:52 AM

so the bench seat bolts and bucket seat bolts are diffrent? i am asking about the bolts that hold the seat track to the cab floor

**71CHEVYSHORTBED402** · 02-23-2024, 05:10 PM

Quote:

Originally Posted by 1969stepside

so the bench seat bolts and bucket seat bolts are diffrent? i am asking about the bolts that hold the seat track to the cab floor

Just my two cents. GM would have gone out of their way to simplify stuff, so to me that means seats take the same bolts. But I can only speak for a bench. Another way to think about it, I don't have a bracket in front of me to measure, but I don't know, 3/16"ish? Full 1/8" at least, guessing. If the brackets you're working with are the same, yeah, probably the bolts cited above. Note GM had their reasons for installing grade 5 seat bolts.

54blackhornet · 02-24-2024, 03:51 PM

Aren’t the original style bolts pointed to assist in getting them started compared with a regular bolt.

1969stepside · 02-26-2024, 11:17 AM

do you need to use grade 5 bolts or grade 8 bolts?

08-17-2009, 02:26 PM	#1
vegaschevy Account Suspended Join Date: May 2009 Location: las vegas nv Posts: 1,493	Seat bolt size and thread pitch? I dont have seat bolts for my truck. What size is the bolt and what thread is it? Also is it a standard bolt or is it special? any pics of them?

08-17-2009, 03:47 PM	#2
my67chevytruck Under Construction Join Date: Oct 2007 Location: Midlothian,TX (DFW) Posts: 4,555	Re: Seat bolt size and thread pitch? they look similar to the cowl bolts. I believe its the same size as well. Pull a bolt from the side of the windshield cowl and see if it matches __________________ Heath subscribe to the board here: http://67-72chevytrucks.com/vboard/payments.php http://67-72chevytrucks.com/vboard/s...d.php?t=157669 FAQ how to's 1956 Chevy Apache 1967 C10 SWB FleetSide (under construction) 1969 K10 SWB FleetSide (Future Build) 1972 C10 SWB Stepside (Future Build) 56 chevy truck : http://www.cardomain.com/ride/2955823/1 67 truck build: http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1 69 k10: http://67-72chevytrucks.com/vboard/s...d.php?t=389470

08-17-2009, 03:47 PM	#3
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,075	Re: Seat bolt size and thread pitch? 5/16 coarse thread __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

08-20-2009, 10:06 PM	#5
my67chevytruck Under Construction Join Date: Oct 2007 Location: Midlothian,TX (DFW) Posts: 4,555	Re: Seat bolt size and thread pitch? i believe 3/4. dont have any infront of me at the moment. the 1" will work as well as there are no stops etc. to keep from sinching down. __________________ Heath subscribe to the board here: http://67-72chevytrucks.com/vboard/payments.php http://67-72chevytrucks.com/vboard/s...d.php?t=157669 FAQ how to's 1956 Chevy Apache 1967 C10 SWB FleetSide (under construction) 1969 K10 SWB FleetSide (Future Build) 1972 C10 SWB Stepside (Future Build) 56 chevy truck : http://www.cardomain.com/ride/2955823/1 67 truck build: http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1 69 k10: http://67-72chevytrucks.com/vboard/s...d.php?t=389470

08-20-2009, 10:19 PM	#6
red71c10 The Red Menace Join Date: Feb 2009 Location: Roseburg, OR Posts: 577	Re: Seat bolt size and thread pitch? I bought new bolts for my seat from LMC and they worked perfectly. __________________ 1971 Custom 10 - 350/350TH - Pwr steering, gauges, Chrome front bumper, Chrome hubcaps, Door edge guards, HD rear springs (current) 1968 C-20 Custom Camper - 350/350TH (orig 327), Pwr steering & brakes, gauges w/tach (former) 1968 C-20 - 307/3sp column (Dad's when I was a kid) "Driving is like coloring. Things get messy if you can't stay inside the lines."

08-20-2009, 11:02 PM	#7
sleepertruck72 Registered User Join Date: Nov 2007 Location: Turlock California 95380 Posts: 2,075	Re: Seat bolt size and thread pitch? I pulled two and they were 5/16" at the threads, 3/4" long, but I dont have a pitch gauge... __________________ 72 C20 Longbed 05 1500 Z71

02-20-2024, 01:14 PM	#9
1969stepside Registered User Join Date: Feb 2008 Location: Johnson City Tennessee Posts: 1,176	Re: Seat bolt size and thread pitch? are the bolts for the bucket seats the same as the bench seat bolts? __________________ Greater love hath no man than to lay down his life for a friend. Members i Have met Earl Slick68 1969 Stepside Build thread http://67-72chevytrucks.com/vboard/s...=1#post4253546 Chevy Trucks the longest lasting most dependable trucks on the road

02-20-2024, 02:05 PM	#10
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,120	Re: Seat bolt size and thread pitch? If you mean the bench seat brackets to seat and floor, (GR 5) 1/2" hex recessed head tapered bolts with spin washers. The bolt threads are 5/16-18 x 7/8" under the spin washer, and the heads are stamped RBM. __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025

02-20-2024, 11:09 PM	#11
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,092	Re: Seat bolt size and thread pitch? ^ What is a "spin washer"? __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

02-21-2024, 09:52 AM	#13
1969stepside Registered User Join Date: Feb 2008 Location: Johnson City Tennessee Posts: 1,176	Re: Seat bolt size and thread pitch? so the bench seat bolts and bucket seat bolts are diffrent? i am asking about the bolts that hold the seat track to the cab floor __________________ Greater love hath no man than to lay down his life for a friend. Members i Have met Earl Slick68 1969 Stepside Build thread http://67-72chevytrucks.com/vboard/s...=1#post4253546 Chevy Trucks the longest lasting most dependable trucks on the road

02-24-2024, 03:51 PM	#15
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,258	Re: Seat bolt size and thread pitch? Aren’t the original style bolts pointed to assist in getting them started compared with a regular bolt. __________________ 71 C-20 07 Magnum RT AWD

02-26-2024, 11:17 AM	#16
1969stepside Registered User Join Date: Feb 2008 Location: Johnson City Tennessee Posts: 1,176	Re: Seat bolt size and thread pitch? do you need to use grade 5 bolts or grade 8 bolts? __________________ Greater love hath no man than to lay down his life for a friend. Members i Have met Earl Slick68 1969 Stepside Build thread http://67-72chevytrucks.com/vboard/s...=1#post4253546 Chevy Trucks the longest lasting most dependable trucks on the road



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