Abstract: A method is disclosed for measuring the threads of standard and metric female thread bolt and standard and metric male thread nut of must commonly used nuts and bolts and the screw diameters in sizes #0 to #14. A separate set of plug gauges and ring gauges match the thread sizes of both the said standard female and metric female thread bolt gauge sizes. Separate standard and metric thread nut thread sizes are present in separate plug and ring gauges to provide ready gauges to measure threads of bolts and nuts not conveniently measure by plug and ring gauges mounted on a display wall structure for protection of the said gauges for dirt and contaminants. The wall mounted display structure provides an immediately available device for checking thread sizes of nuts and bolts.