1/4-20 screws for sale, brand-new and used.

I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806

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Authentic Vintage Gauge Panel for a Heat Exchanger/Regulator - Steampunk Available today is an Authentic Vintage Gauge Panel for a Heat Exchanger/Regulator - Steampunk. This item is the real deal and was actually used on a Heat Exchanger/Regulator!

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NOTE: This unit is missing the 2 mounting screws that hold it to a panel. Otherwise new and fully functional. Precision Digital PD-601-3 Digital Panel Meter Manufacturer: Precision Digital Model: PD-601-3 New – In the box Mnual Incided Inputs: 4 – 20 madc, 1-5 vdc, 0-5 vdc, 0-10 vdc Accuracy: 0.1% of Span +/- 1 count Power: 120 vac Size: 1/8 DIN

Up for auction / your consideration is a Vintage API Instruments Company MM/HG Vacuum panel meter with Tank Pressure and Line Pressure gauges. Please read this entire description and review and examine all the pictures before placing any bids on this set up. I am not sure where I acquired this gauge set up from.