I get all my fasteners from Fastenal. They have a pretty good selection and prices are very good. They also usually are able to get the order in within a day or two. The only downside is that they now require a business identification number.
Their website is pretty easy to navigate and locate an inventory number for the item you are looking for.
I did a quick check and they have a huge selection of 1/4 round headed slotted machine screws and slotted wood screws.
To easily remove the zinc coating I made up a sheet of metal with a bunch of nuts welded to it. Simply screw in the fasteners and run it through the sandblaster. Coincidentally you now have an easy fixture to prime/paint them aswell.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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