American made hardware...found it!

[rubbinisracing]

There are 3 manufacturers of SAE graded cap screws in the states and 1 in Canada. There headmarks are as follows.

Infasco (Canada) - a solid triangle, some cap screws will have a outlined triangle and those products are asian imports

Nucor (US) - a lower case "n"

Lake Erie Screw - "LE" in caps, they also private label for Caterpillar, Lawson, Tifco, Bowman, Porteous, etc.

Highland Thread a Division on MNP - headmark is an outlined "H" that looks like a dumbell.

There are some other cap screws which are made in the USA which are stronger than Grade 8. Those include L-9, Foremost Threaded Products and others.

Avoid RBW marked cap screws...this use to be an American made product many years ago but since the late 70's has been entirely imported from overseas.

Don't forget to ask for Domestic made nuts and flat washers. These are even harder to find.