muffler bolts

[ghsrider173]

does anyone know correct size for muffler bolts m274a5 there are 4 of them many thanks

[Chuck W.]

MS35191-310, Phillips Flat Head-Self Locking Machine Screw - 82 Degree (item #2, below)
5/16"-24 x 1-1/2" long

Might try McMaster-Carr or Fastenal

Are the 4 retainer nuts still on your muffler? (item #1, below)

FYI, item #3 is an asbestos insulating strip.

[Grummanflyer]

These are socket head but they would do in a pinch. It seems to be a little bit of a rare bird.


https://www.amazon.com/24x1-SOCKET-SCRE ... 2292860011

[Chuck W.]

Last time I replaced a muffler, I ordered some 5/16"'-18 clip on barrel nuts (#94850A160) and some 5/16"-18 x 1-1/2" Phillips flat head screws (#90273A587) from McMaster-Carr. The coarse thread worked just as well as the fine thread.

[ghsrider173]

now the next question is the asbestos insulating strip. where do i find something to replace this the stuff i had fell apart when it came apart the barrel nuts where frozen the u boat commander that owned this mule must have kept this mule outside for way to long many thanks guys for the responses

[Chuck W.]

You won't find asbestos any more, but check McMaster-Carr under thermal insulation, possibly something like the Heat-Shielding Millboard Insulation.
https://www.mcmaster.com/#insulation/=1dt9qbv

You might also make something like this work: https://www.ebay.com/itm/1m-2-Exhaust-I ... m570.l1313

Check your local auto parts store for high temp gasket material, might work just as good as anything, although don't get the rubber or cork!

FYI - I just didn't replace it on mine!

[Jeeps4Brains]

You could also look for some fiberglass matting material for using as the spacer.