Re: 55-56 square holes in rear fenders

Posted by Leeedy On 2016/12/14 21:47:31
Quote:

HH56 wrote:
I thought they might have originally planned on a cage nut and later went to something different. Wasn't sure what size. IIRC, the holes are a bit large for a modern 8 or 10 size nut assy. Perhaps the cages were larger then or the hole could have been sized for a piece unique to the auto industry or to Packard.

I ran into something similar on the 47. It has a couple of square holes where cage nuts are used on the top fender to cowl attachment bolts. The nut on one side was missing and when trying a modern nut, the width of the ears was a tad small for the square. I had to widen the nut cage a bit so it would stay in the square and not be pushed back when inserting the bolt.


Not all snap-in cage-type nuts were machine thread. There were also clip-in type Tinnerman nuts (what the people in this forum refer to as "speed nuts") that were used in such applications. These anchor nuts I describe took a sheet metal type threaded fastener or screw. These Tinnerman nuts were used in making everything from aircraft to cars. Of course Tinnerman nuts sped up assembly processes so well during WW2 that they became probably best known as "speed nuts"...and they actually came in both flavors: machine thread and sheetmetal thread.

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