In a hexagonal nut, width across flats by the approximate standard method is ______ (where D = nominal diameter).

Explanation:

Standard conventional proportions may be considered while drawing a hexagonal nut:

• ·    Width of the nut across the flat surface (known as size across flat) = (1.5 × D) + 3 mm
• ·    The diameter of the nut = D in mm
• ·    The thickness of the nut = (0.8 × D) to D
• ·    The radius of front chamfer = 1.5 × D
• ·    The angle of chamfer = 30°
• ·     Depth of cut = 0.61 × P​