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18mm

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Q: What size wrench fits m12 bolt?
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What size Allen wrench belongs to bolt M12?

8mm


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How many millimeters is an M12 bolt?

M12 signifies that the shank is 12 mm diameter. The length will vary. +++ Another tip: The A/F size of a standard M12 bolt or nut is 19mm, so close to 3/4" that the latter spanner will work - but be aware that this is the only co-incidence between metric and inch-based fastenings; and the M-series proportions don't follow a very consistent path!


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How do you find a brake caliper bracket bolt for a 2002 Pontiac grand prix?

http://www.gmpartseast.com/pontiac/components/2002-grand-am_suspension-front-mn060600106-ld9mn52nw69.html or search the google "M12 X 1.75 X 35 10.9" it's size: M12 Thread: 1.75 Length: 35 Steel strength class: 10.9


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Which socket size will suitable for M12 bolt?

Well presuming the bolt has a hexagonal head then the German standard is 19mm across the flats of the head and will require a 19mm socket but you may well find that the ANSI/ISO standard applies which will mean the across flats dimension will be 18mm and will require an 18mm socket. +++ Whilst I accept the American car industry might have its own version, be aware that almost all commercial ISO-M12 bolts and nuts, and the reference charts, have 19mm A/F hexagons, NOT 18mm. By co-incidence a 3/4" A/F spanner will fit a 19mm A/F hexagon but this the ONLY such coincidence between the inch-based and ISO-Metric fastenings.