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Comparison of us ( sae), metric and whitworth wrench sizes u. chart metric af spanners are normally used on nuts and bolts threaded unc or unf ( unified coarse or unified fine) pdf copyright: attribution non- commercial ( by- nc) available formats download as pdf, txt or read online from scribd. the change in how wrench sizes were calculated came as a effort to save metal after better metallurgy was available making stronger wrenches. for example 7/ 16 whitworth to mm size. british standard whitworth ( bsw) takes its name from whitworth, the british engineer who invented it. below you will find a chart explaining the sizing of bolts and nuts complete with the basic sizing for which spanner fits which bolt. this table can help you measure whitworth spanner sizes. to simplify whitworth spanner size chart pdf matters, the term hexagon is used in this section to denote either bolt head or nut.
pdf if you own a pre- or immediate post- ww2 british car or motorcycle you may have wondered why each size spanner is generally identified by two different sizes. why british spanners have dual markings. for instance, a spanner marked 5/ 16” bsf will generally be marked 1/ 4” whitworth as well. this table when referencing which spanner size to use for your bolt, nut or screw with a hexagonal head.
362: the information contained upon this page is supplied in good faith, and to the best of my knowledge is accurate. thus you will see spanners marked along the lines of ' 1/ 4 w 5/ 16 bs' indicating the jaws are sized for a 1/ 4" large hexagon whitworth bolt, or the next step up at 5/ 16" for bsf/ bsw and that is probably of 1954 or later. title: wrench size. you can find the whitworth to metric conversion for any british size wrench.
spanner ( wrench) size. 3mm ( a 3/ 16 whitworth spanner size) so - what is the correct across the flat measure for a 1/ 4" whitworth nut? for example, the notorious and common 1/ 4 whitworth spanner/ wrench has jaws awkwardly sized almost midway between those of 1/ 2 and 9/ 16 inch sae ones or 13mm or 14mm metric ones– a recipe for disaster and rounded fasteners. i queried this with both suppliers and both insisted that these were indeed 1/ 4" whitworth and that the across the flats measure on the 1/ 4" hex should be 11. xls author: paul created date: 8: 58: 52 am. comparison of us, metric and whitworth wrenches open end wrench box end or socket wrench.
typically, you will find bsf/ bsw used in british equipment designed before 1948 ( for instance early land rover and austin healey gearboxes). slogging spanner deep ring spanner offset additional info: t gedore non- glare, matte chrome- plated, 31crv3 t various standard individual spanners compiled as practical sets t supplied in metal case, module or other holder t see respective product in catalogue section for din standards and info on material quality t some spanner ranges are. this is because some pdf imperial tools make a good fit for metric nuts, bolts, etc, and vice versa ( though of course many don' t). this useful size comparison chart gives information on spanner jaw sizes including metric, af ( across flats) and imperial.
metric imperial unc/ unf spanner size ( mm) spanner size ( inches) metric threads alternative sizing class 4. for your convenience, here is a simplified chart of which spanner you should use for what size of bolt or nut you need to turn. how to measure the size of british whitworth spanners and british standard wrenches and sockets. the size marked on a whitworth or bsf ( british standard fine) spanner refers to the size of the thread and not the size of the head of the bolt it fits.
some sizes had near or exact sae or metric equivalents, but others most certainly did not. a size conversion list can be stuck to the lids of socket, spanner. 8 structural stainless sae decimal inches grade 5/ 8 af as 1111 as 12 / 933 / 934 as 2465 m 1. as a result, spanners are marked along the lines of ‘ 1/ 4 w 5/ 16 bs’ pdf indicating the jaws are sized for a 1/ 4″ large hexagon whitworth bolt, or the next step up at 5/ 16″ for bsf/ whitworth spanner size chart pdf bsw. chart two spanners, both nominal size 5 ⁄ 8 in, with a diagram superimposed to show the logic that allows them both to be nominal size 5 ⁄ 8 in when their actual sizes are clearly different ( across- flats distance vs screw diameter). spanner size ( mm) a/ f: b. a whitworth spanner is larger than a bsf so 1 / 4 inch whit is for example the same size as a 5 / 16inch bsf.
( sae) metric whitworth decimal inches open- end wrench box/ socket wrench nominal size min. whitworth thread is coarser than a bsf of the same diameter, but the same spanners are used on whitworth spanner size chart pdf both ranges, and are often marked with both whitworth and bsf sizes. spanner size comparison chart dimensions shown are in mm, if you wish to convert to inches, please use our universal converter. click here for a wall chart of fastener hex sizes. whitworth and british. these provide from 77 to 87% of full thread. whitworth wrench and socket sizes are marked pdf with a ' w' suffix behind the size. tap drill diameters shown in this column are recommended sizes listed in bs 1157: 1975.
34mm), this occurs t. a good example is 3/ 4", which is 19. so a 3/ 8" whitworth wrench is a lot larger than a 3/ 8" whitworth spanner size chart pdf bsf, unf, or anc wrench. it was an early attempt at a standard for threads and spanner sizes.
a printed list of the exact metric sizes of imperial spanners, sockets & drill bits is handy. a whitworth spanner or socket is larger than one marked with the same size in bsf for example a 1/ 4 inch whit is the whitworth spanner size chart pdf same physical size as a 5/ 16inch bsf. double ended ring spanners 129 ratchet spanners 123 combination spanners 125 deep ring spanners 141 open ended spanners 134 slogging spanners 142 swivel head wrenches 145 crowfoot spanners 144 socket wrenches 146 hook spanners 150 multi fitting keys 150 pdf accessories 151 spannersspanners tolerances 120 unit- drive profil 121.
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