'74 Midget - Heater Box Bolt Size?

[AngliaGT]

It's been 3-4 years since I pulled it apart,
& not sure where I put the bolts to mount it to the
body.What size/thread are they?
And what size do the air outlets on the box use?

 

[JPSmit]

IIRC Doug the heater box is attached with sheet metal screws not bolts.

 

[Jim_Gruber]

JP, they are bolted in place 7/16 fine thread same size as the bolts holding on the cover plate over the ps footwell. At least on a BE that’s what they are.

 

[dklawson]

Jim, I assume you mean 7/16" across the flats which would have 1/4" threads (1/4-28 UNF = fine). 7/16 threads would be awful large.

 

[Jim_Gruber]

Doug, You are correct, 7/16” nut 1/4 28 bolt. I just chased those threads 2 mi utes ago. 1/4 28 tap

 

[Trevor Jessie]

I prefer to use socket head bolts on those. And use anti-seize.

 

[AngliaGT]

Doug, You are correct, 7/16” nut 1/4 28 bolt. I just chased those threads 2 mi utes ago. 1/4 28 tap

OK,I'm a little confused.Is there a nut?
Exactly WHAT do I need?

 

[Rhodyspit75]

You need a 1/4 x 28 bolt. I believe I used 3/4 inch long. The 1/4 inch bolt has a 7/16 head that’s where the confusion comes in.

 

[jcatnite]

I think the nuts are captured in the body of the car. All you need are the 1/4 -28 bolts and a washer. I think 3/4 long is what I used on the 76 midget. Haven't tackled the 74 yet.