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Old 11-30-2021, 11:07 AM   #1
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Engine Cover Bolt

I remember seeing this asked before, but couldn't find the answer.

Does anyone recognize this bolt and where to find it? It holds down the engine covers in my coach. I think the head it called a "Sidewalk Bolt" head, but the threads are so different.
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Old 11-30-2021, 04:40 PM   #2
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It looks more like a button head, captive washer, square threads. Square threads are usually used on threaded rods, either for precise movement like in CNC or high torque applications like a vice or other clamping. Not common on a bolt.

The one thread especially is pretty galled up, lots of rust. With a little work, a file, wire brush and solvent it's still usable for an engine cover. As long as the socket in the head isn't trashed.
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Old 11-30-2021, 05:50 PM   #3
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Quote:
Originally Posted by Bigd9 View Post
I remember seeing this asked before, but couldn't find the answer.

Does anyone recognize this bolt and where to find it? It holds down the engine covers in my coach. I think the head it called a "Sidewalk Bolt" head, but the threads are so different.
Looks like an Acme threaded screw. I have never seen one with a head, though acme threaded rods are pretty common. You might try (ugh) Fastenal.
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Old 11-30-2021, 05:57 PM   #4
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Quote:
Originally Posted by n2zon View Post
Looks like an Acme threaded screw. I have never seen one with a head, though acme threaded rods are pretty common. You might try (ugh) Fastenal.
x2.
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Old 12-01-2021, 07:29 AM   #5
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Might want to check Fleetwood for those my search came up empty. If it uses/mates with a body clip you may be able to replace both to use normal threads.
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Old 12-03-2021, 06:56 AM   #6
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I tried Fastenal. The counter guy said he never saw anything like it! I did manage to match the thread pitch to a metric lag bolt, but I couldn't match the bolt diameter with anything.

I agree it is a Acme threaded screw of some sort.

You would think with Fleetwood using them to bolt down the engine cover they would be a standard part.
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Old 12-03-2021, 07:27 AM   #7
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While the shanks appear similar, one screw appears to have a buttress head. One can infer from the tape measure that the thread size would be 1/4-10 which does not exist. A search of lead screws lists nothing in the 6MM range.
No taps in these sizes exist. Spent an hour or so on this unicorn. Sorry.
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Old 12-06-2021, 07:07 PM   #8
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Machine shop friend make one for you??? expensive! Go to a home depot and match as close as you can? cheaper!
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Old 12-06-2021, 07:39 PM   #9
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Thanks everyone. Where there's a will, there is a way. I'll figure out a replacement.

But you gotta wonder, where on earth did Fleetwood get these bolts (screws?) in the first place? You know they didn't have them specially made just for a engine cover hold down. My guess is a Fleetwood purchasing agent found a supply of miss manufactured bolts that were being sold at a great discount!
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Old 12-06-2021, 07:53 PM   #10
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If Fleetwood did buy a large quantity, it had to be extremely large, because they were using them in 1992 and 2006.
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