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Spanner and Allen Key Sizes

Correct Spanner and Allen Key sizes are given in the table below for the normal range of bolt and nut sizes found in plant and machinery.

To minimise the risk of a spanner slipping and marring the corners of a fastener, it is good prac� se to use ring spanners (or the ring end of a combina� on spanner) whenever possible.

Size Spanner Allen KeyM5 8 mm 4 mmM6 10 mm 5 mmM8 13 mm 6 mmM10 17 mm 8 mmM12 19 mm 10 mmM16 24 mm 14 mmM20 30 mm 17 mmM24 36 mm 19 mmM30 46 mm

Disclaimer: The information on this page has not been checked by an independent person. Use this information at your own risk.

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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, ringspanners, and sockets. It is probable that smaller dimensions can be used if the wrench / spanner / socket geometry is selected atthe early design stage. The links on this table provide more detailed information.

For Bolt edge distances applicable to structural design refer to Edge Distances

Bolts Holes, Min Spacings, and Wrench / Spanner Clearances Precision Hexagon Bolts And Screws

Dimensions in mm

Tables for bolts and screws in accordance with BS 3692:2001..ISO metric precision hexagon bolts, screws and nuts. Specification.

Note clearance hole dimension "D" is in line with BS EN 20273:1992, ISO 273:1979. med fit

Size Hole D Min PClearance

GSNom. SizeSpanner(A/F)

H(Sq.Drive)a b c

M3 3.4 14 10 8 10 - 5.5 14(6,3)

M4 4.5 17 10 8 12 14 7 22(10)

M5 5.5 20 10 8 12 14 8 22(10)

M6 6.6 24 14 10 15 17 10 26(12,5)

M8 9.0 30 18 12 18 22 13 26(12,5)

M10 11.0 37 28 14 21 27 17 27(12,5)

M12 13.5 42 30 16 22 30 19 29(12,5)

M16 17.5 50 30 20 26 38 24 42(20)

M20 22,0 60 32 22 32 46 30 47(20)

M24 26,0 75 48 25 38 55 36 54(20)

M30 33.0 94 60 30 48 70 46 70(25)

M36 39.0 104 60 34 52 90 55 81(25)

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Head Clearances http://www.roymech.co.uk/Useful_Tables/Screws/Head_Clearances.html

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High Strength Frict ion Grip Bolts

Dimensions in mm

Clearances suitable for bolts & nuts to BS EN 14399-3:2005.. High-strength structural bolting for preloading. System HR. Hexagonbolt and nut

Size Min PClearance

GSNom. SizeSpanner (A/F)a b c

M16 56 30 25 38 27 27

M20 64 48 28 42 48 32

M24 84 48 40 55 65 41

M30 98 60 45 65 77 50

M36 112 60 45 70 81 60

Relevant links

Tecnocentro Wrench clearances.. Excellent source of relevant information - Better and more detailed than myinformation

1.

EngineersEdge Wrench Clearances.. American (inch sizes) similar to Information in Machinerys Handbook2. Icrank Wrench Clearances.. American (inch sizes) .3.

This Page is being developed

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Please Send Comments to Roy Beardmore

Last Updated 24/01/2013

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► Head Bolts

Head Clearances http://www.roymech.co.uk/Useful_Tables/Screws/Head_Clearances.html

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Spanner and Key Sizesfor Common Fasteners

Spanner & Hex Key Sizes forSets/Bolts and Socket Caps

Size SpannerSize

Hex KeySize

M8 13mm 6mm

M10 17mm 8mm

M12 19mm 10mm

M14 22mm 12mm

M16 24mm 14mm

M18 27mm 14mm

M20 30mm 17mm

M24 36mm 19mm

We have a full range of spanners, sockets, keys, wrenches, and driversalways in stock!

We also keep a wide range of ancillary products such as taps and dies, threadlock(various types), abrasives and lubricants.

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Spanner and Key Sizes for Common Fasteners http://www.cwfasteners.co.uk/spannerandkeysizes.htm

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