A metric thread has 60° included angle. Best-size wire contacts the flanks at the pitch line, with $d_w=p/[2\cos30^\circ]=1.4/\sqrt3=0.80829$ mm. Rounded: **0.81 mm**. The official accepted interval ends at 0.81.
More Metrology and Inspection questions
GATE 2023 PI Q23– The surface-texture symbol is shown, with all values in µm. Find the difference between…
GATE 2022 PI Q31– Absolute surface deviations from a datum line are 10,15,12,10,13,12,20,25 µm. Find RMS…
GATE 2022 PI Q42– An assembly has hole size 25.000 mm with upper/lower deviations +0.002/−0.001 mm and shaft…
GATE 2022 PI Q56– Two spherical steel balls of diameters 3 and 4 cm are placed in a cylindrical cavity as…
GATE 2021 PI Q21– Match features P:surface-plate flatness error; Q:cam profile; R:machine-tool slideway…
GATE 2021 PI Q44– A hole is 30 mm with upper/lower deviations +0.040/0.000 mm. Its mating shaft has minimum…