If you ever wanted to know the size of factory U-Nuts

[71CHEVYSHORTBED402]

Here you go. Spent WAY more time measuring than a person should, ("damn your eyes"......"too late"). Anyway, should be right and feel free to correct.

At some point this list will be a mile long. Get to inventory the parts (fun) before I have them phosphate coated or zinc plated. I just went through the U-Nuts to see if I can buy matching new.

THIS HAS BEEN UPDATED. Picture was gone, so added this instead.


Placement & Part / Description / Thread size

FAN SHROUD U-NUTS U-NUTS - 3/4 (W) X 5/8 (L), WITH A 7/32 CENTER HOLE TO EDGE 1/4

MARKER LIGHT U-NUTS U-NUTS - 1/2 X 5/8, WITH A 1/4 CENTER HOLE TO EDGE #8

TAIL & REVERSE HOUSINGS J-NUTS J-NUTS - 1/2 X 5/8, WITH A 3/8 CENTER HOLE TO EDGE #10

HEADLIGHT BEZEL J-NUTS J-NUTS - 7/16 (W) X 21/32 (L), WITH A 3/8 CENTER HOLE TO EDGE #8

GRILLE U-NUT U-NUT - 5/8 (W) X 1 (L), WITH A 9/16 CENTER HOLE TO EDGE 5/16-18

GRILLE U-NUTS U-NUTS - 7/16 (W) X 11/16 (L), WITH A 3/8 CENTER HOLE TO EDGE 1/4

GRILLE U-NUT U-NUT - 3/4 (W) X 11/16 (L), WITH A 3/8 CENTER HOLE TO EDGE 1/4

A/C VENTS (outer vents) J-NUTS - 7/16 (W) X 9/16 (L), WITH A 3/8 CENTER HOLE TO EDGE #8

COWL PANEL J-NUTS J-NUTS - 1/2 (W) X 5/8 (L), WITH A 1/2 CENTER HOLE TO EDGE #10

INNER FENDER U-NUTS 21/32 (W) X 1 (L), WITH A 9/16 CENTER HOLE TO EDGE. FLOATING SQUARE NUTS 5/16-18

RADIO BRACKET/SUPPORT U-NUTS 1/2 (W) X 1 (L), WITH 1/2 CENTER HOLE TO EDGE 1/4"

DASH PAD J-NUTS 7/16 (W) X 5/8 (L), WITH 3/8 CENTER HOLE TO EDGE #8

INSTRUMENT CLUSTER 7/16 (W) X 5/8 (L), WITH 3/8 CENTER HOLE TO EDGE #8

ASH TRAY BRACKET 1/2 (W) X 11/16 (L), WITH 3/8 CENTER HOLE TO EDGE #8

GLOVE BOX DOOR 1/2 (W) X 7/8 (L), WITH 5/8 CENTER HOLE TO EDGE #10

DOOR (1972 Only) 1/2 (W) X 11/16 (L), WITH PENDING CENTER HOLE TO EDGE #10

[B. W.]

thanks, I already saved it. I try to bag & tag everything & take pictures but when I go to put it together the picture never shows exactly what I need to see.

[71CHEVYSHORTBED402]

Originally Posted by B. W.

thanks, I already saved it. I try to bag & tag everything & take pictures but when I go to put it together the picture never shows exactly what I need to see.

I wouldn't put that chart to bed just yet B.W. I found an error. Must have been measuring from the wrong side. The chart was updated. I'm going through what's available new. Any other f-ups (hopefully none) will be updated.

Sorry about that...........I've double checked it's good to go.

[LockDoc]

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Here is the "U" nut size for the '72 only door stiffener screw below the wing window.(2 needed, one for each side) #10 screw, hole center 7/16" from outer edge. You can add it to the chart if you want.

Edit: The instrument cluster "U" nuts are exactly the same as the dash pad "U" nuts....

LockDoc

[71CHEVYSHORTBED402]

Originally Posted by LockDoc

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Here is the "U" nut size for the '72 only door stiffener screw below the wing window.(2 needed, one for each side) #10 screw, hole center 7/16" from outer edge. You can add it to the chart if you want.

Edit: The instrument cluster "U" nuts are exactly the same as the dash pad "U" nuts....

LockDoc

Oooooooooops, looks like I forgot the instrument cluster. I'll add the 72 door as well. Thank you............

Sure will be a lot easier to measure with the digital gauge pending receipt. Anyway, I've updated the chart with a few more U-Nuts. Can't think of any more. Thanks

[71CHEVYSHORTBED402]

Yep, pictures only have some value. I prefer to put everything into words, which is tricky, because what you write today may be meaningless tomorrow.

These may be the most common #8. No sign of width or length but that should be OK, I think. I've asked the company to clarify how the "Center Hole To Edge" is measured, but I think it's right. Good company, just discovered them. https://www.fastenal.com/products/details/0162858


This MIGHT be close to the original J-Clip that mounts to the E-Brake on the firewall for the LH harness. I don't have the patience to match the way they measure this stuff, but for the price what the heck. It's nylon coated. The originals are rubber coated. Close enough. https://www.fastenal.com/products/details/0709204

I figure the thread cutting nuts for the Dash Pad are between these two or both, because the two studs on the outside appear larger than the other five. That said, I need 200 of these like a hole in the head, but for twice the costish you get 20x the pieces:

https://www.fastenal.com/products?te...32&searchMode=

https://www.fastenal.com/products/details/0162828

Marker lights I'm guessing. Looks similar if not identical. Their Center to Edge measure is approx. 7/10ths a millimeter shorter than my measurement, assuming I'm measuring right. Real close. I don't need them, the originals look great and they're easy to finish. https://www.fastenal.com/products/details/11120280