spanner size calculation formula

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 nut bolt spanner size calculation formula

1. Any bolt spanner size formula.
2. 6 MM × 1.5 = 9 + 1 = 10 spanner size.
3. 8 MM × 1.5 = 12 + 1 = 13 spanner size.
4. 10 MM × 1.5 = 15 + 1 = 16 spanner size.

1. 18 MM × 1.5 = 27 + 1 = 28 spanner size.
2. 20 mm × 1.5 = 30 + 1 = 31 spanner size.
3. 22 mm × 1.5 = 33 + 1 = 34 spanner size.

Following formula are used to calculate spanner size –

For bolt size upto M14

Spanner Size = ( Bolt Size * 1.5 ) + 1

Example for M12 bolt , Spanner Size = ( Bolt Size * 1.5 ) + 1 = ( 12 * 1.5 ) + 1 = 18 + 1 = 19

Above from M16 bolt  

Spanner size = Bolt Size * 1.5

Example for M16 bolt , Spanner Size = Bolt size * 1.5 = 16 * 1.5 = 24

Bolt/Nut Size Spanner Size

M3            5.5mm

M4                7mm

M5                8mm

M6              10mm

M8                13mm

M10             17mm

M12          19mm

M14            22mm

M16            24mm

M18            27mm

M20           30mm

M24           36mm

M30           46mm

M36      55mm