Part number help

[Donald O.]

From the AIM for a full size 1958 Chevy

i need the complete description; length of screw, thread size type of nut, plated, black phosphate, etc.

3738319
3738752
3681424
144551
120386
120380

All help gratefully accepted.

Don

[Leif A.]

From the AIM for a full size 1958 Chevy

i need the complete description; length of screw, thread size type of nut, plated, black phosphate, etc.

3738319
3738752
3681424
144551
120386 - .31 ID X .75 D X .07 TK FLAT WASHER, MECHANICAL ZINC.
120380 - 1/4 REG SPLIT LOCK WASHER, MECHANICAL ZINC.

All help gratefully accepted.

Don

Don,
Two above ID'd...sorry on the other four.

[Gary C.]

Don,

This is all I could find - 3681424

Gary
....
image.png

[Richard M.]

I found info on the top two but not the details. It looks like a hex head with integrated washer.

Is it the bolt for the grille to bracket? It appears it screws into the J-Nut that Gary found.

Edit: it also shows up in this catalog. You'll have to download and search for the numbers.

https://rparts-sites.s3.amazonaws.com/2c4ad8f278fc59a27d14d38eb7e9513a/design/Chevy-Parts-Catalog-Full-Size-Impala-55-57.pdf

This is all I could find. The numbers dont show up on gmpartswiki.com. Ignore the red arrow. I found these 1957 Chevy AIM images online.

Screenshot_20250525_151516_Chrome.jpg
Screenshot_20250525_152258_Chrome.jpg

[David B.]

144551 hex bolt 5/16 - 24 x 2-1/4 GM-260-M Blued