The standard size M8 hex nut is 13 mm across opposite faces, the vast majority you will encounter will be this size although you do occasionally see other sizes.

ANSI B18.2.3.9M Metric heavy hex flange screws; iso 4228 Spanners and wrenches — Spline drive ends for power socket wrenches; ISO 724 – Metric Threads.

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The ISO metric screw threads are the most commonly used type of general- purpose screw. If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted (e.g., M8). The length of a. Hex head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. Other ( usually.

Hexagon Nut and Bolt Sizes. Determine the maximum torque according to bolt (nut) size and grade. Always consult the manufacturers instructions or engineering recommendations when making bolted connections. Important: the hexagon sizes shown in the tables should be used as a guide only. individual sizes should be checked before specifying any.

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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

Nominal Size, Spanner Size. M1.6, 3.2mm. M2, 4mm. M2.5, 5mm. M3, 5mm. M3.5 , 6mm. M4, 7mm. M5, 8mm. M6, 10mm. M7, 11mm. M8, 13mm. M10, 17mm.

bolt sizes m The "M" designates the bolt is Metric and the number after the M indicates the size. The number after that is the length. The number after that is the thread pitch. eg: M10 x 40 x 1.25. In this example the bolt is 10 mm in diameter, 40 mm long, and the threads are 1.25 mm apart.

The spanner sizes of these, by contrast, are marked with the diameter of the bolt they would fit – e.g. a 1/2" BSW spanner will fit a BSW nut and bolt of 1/2" thread diameter. A further complication is that BSW spanners will normally also fit a BSF nut one size larger – e.g. a 1/2" BSW spanner will also fit a 9/16" diameter BSF nut and bolt.

Wrench / spanner clearances around screw Heads .. Important Note. The information below is generally based on conservative appraisals of the clearance required for open ended spanners, ring spanners, and sockets. It is probable that smaller dimensions can be used if the wrench / spanner / socket geometry is selected at the early design stage.