this number is used because it is show that, which size of bolt or nut is opened by this spanner or in other words the number is show that only this size of nut or bolt is tight and open by it.
My question is not about nut and bolt. My question is about spanners and wrenches...
Anand Kher
Dec 28th, 2014
The number denotes the width across flat of the nut/opening of the spanner (size in mm/inch used for)
Denz
Jan 5th, 2015
Its called Across Flat dimension (A/F). When you see nut or bolt head, it has a hexagonal feature. Which means two opposite parallel faces (total of 6 sides )and the distance between the two opposite face is the number that you are seeing in the Spanner. for example; if a spanner number is 10 in size, it is used to tighten / loosen any part which has two opposite parallel face with 10mm (normally tolerance of spanner will be more in plus side) apart. Thanks in advance
Jones
Jan 21st, 2015
Its the Jaw size of the spanner.
Surendra Nath Singh
Mar 4th, 2018
The number given on spanner is outer diameter of Nut and bolt in MM.
Meaning of Numerology on spanners and wrenches
What is the exact meaning of that numbers?
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