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MG MGA - Seats - What bolts?

Hi guys,

I've just started to rebuild my seats and I've got a little issue....

I dismantled the seats several years ago to give the frames a good clean up and paint. Whilst the frames are nice and big and difficult to lose, I have successfully lost the bolts that fix the bottom to the top of the frames.

Does anyone know what the bolts are - size, shouldered or not, part number?

Many thanks,

Grant :-)
G Hudson

Grant

It is not listed in the parts manual as far as I can see, nor the MGA Technical Manual issued by the MGCC.

I have just had a look at mine, but I replaced them during my rebuild. I used 5/6" x 1" UNF bolts (shouldered) with nylock nuts.

Steve
Steve Gyles

Just went out in the garage and looked at one. It is 5/16 SAE or fine thread. It looks like the top or back part has threads in it and goes on the outside of the bottom part. Bolt head coming from the inside.
GK George

Grant,
Brown and Gammon Catalogue quote these as Item 15
Ref No. CMZ410 Screw - Seat Rail to Frame 16 Required, plus Spring Washer GHF331 16 required.plus Nut GHF200 16 Required.
David
D C GRAHAME

David

It's the 2 bolts that join the folding seat back to the seat base that Grant is looking for.

Steve
Steve Gyles

Here is a picture of a seat that I believe has not been disturbed.

No washers except a plain one in between the frames. No locknut, did they use loctite?


Neil McGurk

Neil

I doubt it. They probably relied on rust securing them together.

Steve
Steve Gyles

It is as GK mentioned. One part is threaded so the clearance can be adjusted and the nut then acts as a double lock nut.

John
John Progess

John, you are correct the outer part (seat back) is threaded, but the threads are cut through two squashed tubes and can soon be worn away.
Neil McGurk

Could have fooled me. Seems like the frame parts are too thin to be threaded. My seats (since more than 30 years ago) have two clearance holes. One or the other may from time to time look like it was threaded, but it is only wear in the holes from the threaded bolt I've been using. I use a 5/16" fine threaded bolt with a self-locking nut on the outside.
Barney Gaylord

Barney, I share your doubts regarding the engineering credibility. However, on one side the bolt was still tight in the threads of the frame (after removing the nut). The other while worn on both frame and bolt could not be removed without turning.
Neil McGurk

I agree with that hole in the frame was originally threaded. My seats were like Neil's half of the threads were stripped out. Todd Clarke sells a seat fastener kit with the proper parts but it is as original with a thin jam nut. I added a thin nylon washer between the parts.

Jim
Jim Ferguson

This thread was discussed between 09/11/2009 and 10/11/2009

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