Thread: Nova TCS Switch & Wiring Gutter 101
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Old 01-27-2010, 05:00 AM
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Default Re: Nova TCS Switch & Wiring Gutter 101
Hello Sam,

Normative Observable Practice is
Part number 9419320
Indented Head 10-16x3/8 5/16 AF .40 OD
Hex Washer Head Tapping Screw

Common to have a triangle inside of 2 Circles for a head marking. Magnesium Phosphate. Black to dark gray.

I can not rule out that zinc was also used. However I do not believe Zinc is original. This part number is sold as repro in zinc.

Does that help?
Greg
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