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?

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

Re: Seat bolt size and thread pitch?
 

5/16 coarse thread

Re: Seat bolt size and thread pitch?
 

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

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.

Re: Seat bolt size and thread pitch?
 

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

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...

Re: Seat bolt size and thread pitch?
 

Good enough for me

Re: Seat bolt size and thread pitch?
 

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

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.

Re: Seat bolt size and thread pitch?
 

^ What is a "spin washer"?

Re: Seat bolt size and thread pitch?
 

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.

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

Re: Seat bolt size and thread pitch?
 

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.

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.

Re: Seat bolt size and thread pitch?
 

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