K. and J. Bacon (Baconsdozen). 

    After over thirty years of selling good quality imperial tools ,the entire stock is being cleared,and will not be replaced,its been emotional.

Tel (44) 01472353993 or Mobile 07974435627

Whitworth/BSF combination spanner set.An Imperial sized tubular box spanner.Miniature spanner set for magneto or point setting.Large twelve point hub nut socket.


Whitworth,BA tools | Whitworth,BA socketsWhitworth,BA spanners |  AF (SAE) sockets  |  AF (SAE) spannersGeneral Tools

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Deep type BA socket setMiniature spanner set for magneto or point setting.BA combination spanner set.BSW 1/2 drive 12 point socketsLarge twelve point hub nut socket.Deep AF (SAE) socket set.


As a rough guide Whitworth and BSF are found on pre 60s machinery,AF from 60s to 90s,BA started to vanish about the same time as Whitworth .These dates vary depending on where the machinery was made,who made it and lots of other factors, but for any thing pre metric we sell the  tools needed in ranges to suit everyone from the professional engineer to the DIY enthusiast. For classic,veteran and vintage cars and motorcycles,plane,boat and train engines,farm implements and plant,stationary or steam engines etc we have individual imperial sized sockets or sets in six and twelve sided,deep,standard and impact form, cranked ring,box,open ended and combination spanners in imperial sizes and send them worldwide. We stock tools nobody else does,including many so called obsolete sizes and specialised tools for hub nut,ball joint and crank pulley nuts sourced from quality makers in various countries. Links below are personal pages,old cars, projects and other car related stuff..

Rover P5b rolling restoration.  |  Running an old london taxi cab.  |  Mk1 V4 transit motorhome.  |  My home made motorhome

   Range Rover P38.  | Fixing stuck fastenings.  |  Freeing seized engines.  |  About us.   |  Links page.    


Vacuum gauge for setting carburettors and engine fault finding1/4 inch drive BA sockets for working on older electrical components on cars and bikes etc.Obstruction spanners,used where access is difficult for conventional tools.Feeler gauges for setting valve clearances etc.Thread gauge identifies thread types and sizes.

Abbreviations and definitions used throughout this sites pages.

 British Standard Whitworth (B.S.W.) .
Usually simply referred to as Whitworth or Whit,this is an early (1800s) English thread standard,named after its British inventor Joseph Whitworth and found on many veteran and vintage machines. Threads are coarse,angle 55 degrees and the pitch is measured in threads per inch.During 1924 the sizes of the heads of BSW and BSF bolts were reduced to save metal,all nuts and bolts were made with heads one size smaller (ie) a 'new' 1/2 whit bolt had the same size head as the 'old' 7/16. The size marked on the spanner (half inch whitworth, nine sixteenths whitworth etc) refers to the diametre of the shank of the bolt it fits,not the head size and is always stated in fractions of an inch. For this reason a Whitworth spanner or socket is always larger than AF ones carrying the same size markings. All Whitworth tools will carry a marking,normally a fraction followed by "W", "BSW","WHIT" or Whitworth and sometimes "W/BSF" . The second world war proved the need for a universal standard in bolt sizes which eventually resulted in the introduction of the 'Unified' or SAE system which utilised AF (across flats) spanners and sockets.As a result Whitworth and BSF were pretty much obsolete by the 60s but still found on some cars,motorcycles trucks,trains and machinery made after this. .
Society of Automotive Engineers.Established in the early 1900s the society was formed to establish  standards that could be adopted within the enginering and maufacturing industries. Some imperial AF spanners are marked 'SAE'.
British Standard Fine (B.S.F.).
Usually referred to as BSF,in effect,a fine version of whitworth. (More threads per inch) Size as with whitworth refers to the threaded part of the bolt,not the head. BSF spanners are always marked one size larger than the same sized BSW spanner so for example a 1/4 inch BSW spanner is the same size as a 5/16 inch BSF. Nuts and bolts in BSC (British cycle thread) are used on some very early machinery,mainly motorcycles and bicycles or autocycles etc. Whitworth and BSF spanners or sockets will fit these.
British Association (B.A.).
British Association,an early thread standard used on smaller nuts and bolts.These fixings are mainly found on electrical components or instruments etc.Still encountered on some relatively modern machinery and used in model engineering etc.Unusual in the the larger the number on a spanner or socket the smaller the tool. Sizes normally seen range from 0BA to 10BA although sizes from 11BA to 23BA are included in some text books and manuals.The even numbered BA sizes are used more frequently than odd with 2 BA probably the most commonly encountered on older cars and motorcycles etc.Whitworth and AF spanners or sockets are not designed to be used on BA fixings.
For spanners and sockets A.F stands for Across Flats (not in this instance American Fine) and indicates the gap between an open ended spanners jaws and the distance across the nut or bolts parallel faces.Normally measured in fractions of an inch (7/16, 1/2, 3/4  etc) . They are normally marked with the size in fractional inches (1/2 AF,1/4 AF etc) or sometimes with the decimal inch equivalent (50AF or 25AF etc). Some are found marked with a fraction and the letters SAE. Spanners and sockets measured and marked in whole millimetres are intended for metric threaded fixings and are really AF Metric (across flats mm) but are usually simply called metric,with very few exceptions they will not fit imperial AF nuts and bolts.
Please note when ordering BSW tools that the size of the tool is larger than the size stamped on it.Many people order Whitworth tools basing the size they need on a metric or AF tool. Please refer to our conversion charts to make sure you arent buying larger sockets or spanners than you need. A kit up to 9/16 whit will fit almost every nut and bolt on a pre mid 60s classic english motorcycle for example.
UNC and UNF.
Unified Coarse or Unified Fine,the thread standard that superseded B.S.W and B.S.F etc. Now fast becoming obsolete but commonly used on many vehicles late 50s to 80s or much later on some USA made machinery. Most UNC and UNF fittings are designed for the use of AF (Inch based) tools.
Box spanners.
In some countries the ring end of a combination or ring spanner is called a box, but for most a box spanner is a tubular spanner used to access deeply recessed nuts and bolts.The spanner is normally turned by a seperate tommy bar. Deep sockets will do the same job unless the nut is very deeply recessed and/or access around it is limited,box spanners may then be the only tool that will work as they are normally six sided and thin. The strength of box spanners is limited and they tend to spread if excessive force is used on them.Although now considered by some as obsolete there are still certain applications where they are indispensible. (Some motor cycle cylinder head nuts being an example)
Six point sockets (hex).
The square hole in the top of any socket is to accept the end of a ratchet or extension bar and is always an  imperial size .1/4,3/8,1/2 or 3/4 inch are common,one inch and above are used on larger sockets.
Sockets can be six point (shaped inside as a hexagon) sometimes called mono hex,most impact sockets are six point and coloured black.Chrome vanadium sockets are now common in six point they may grip worn or damaged nuts and bolts better and are kinder to soft metal or chromed fixings. Some small ring spanners are made with hex ends mainly for brake bleed nipples etc. Flare nut wrenches for fuel or brake pipes are often six point with part cut away to allow them to slip over the pipe so that they then grip almost all round the fitting.(Most wheel nut sockets are six point).
Twelve point sockets (bi hex).
Twelve point (or bi hex) sockets are a double hex configuration. Most ring spanners are of bi hex configuration, where access is limited bi hex tools need a smaller movement to turn a nut before they can be removed and refitted to enable the fitting to be turned again.
Flank drive,Hi Torq,wall drive etc are all different designs of sockets or wrenches claimed to drive without putting excess force on the very corners of hexagonal nuts and bolts.(The introduction of fine toothed ratchets has made 12 point sockets less common).
Anything which uses inches or fractions of an inch as its measurement. Thus a 1/2 inch AF,or a 1/2 inch whitworth or BSF is an imperial sized spanner or socket,a 19mm is not. I regard Whitworth,BSF,BA and AF as Imperial tools. I don't sell the types of sockets and spanners that are supposed to fit everything from mm to torx and Whitworth, I would rather a tool was designed to fit one size of fastening precisely rather than various sizes 'almost'. There are few imperial tools that I can no longer source, if this happens and only where a metric tool is very close in size I can probably supply a suitable one as an equivalent. I have many more tools available than the selection that is shown on the pages of this web site.
Ring spanner.
 A spanner with its ends forming a circle,the inside is normally formed with twelve sides (commonly called bi hex) in the same way as a conventional socket . They are normally made with one end being the next size up or down of the other (for example 1/2 x 9/16 inch AF),usually cranked  as in the photo above they are also made in a shallow version or in rare cases flat.
A combination spanner is one with an open end and a ring end normally of the same size.  Some combination spanners are made with a rotating,ratchet ring end and some with a shaped open end that also allows a ratchet type action
Block spanners are called because they were used on difficult to acces fittings on an engine block,now they are normally called obstruction spanners and made in either curved or 'S' shapes. Some obstruction spanners are made with their ends at right angles to the shaft. Stubbies are normally short versions of conventional spanners and Crow Foot spanners are very short spanners made to be turned with a conventional socket extension bar..
Don't forget If you are not sure what tools you need for the restoration or repair of your veteran,vintage or classic car or motorcycle study the information above and looking at our imperial to metric etc spanner and socket size conversion charts .
Doppenset...Jeu de Douilles...Nusssatz...Set Bussole..Juego de Casquillos...schraubenschlueel...che a molette...llave...chiave.

We still prefer to do things in an old fashioned way and you can phone on 01492 353993 or mobile 07974435627 . We are no longer here 24/7,but if you e-mail we'll try and get back to you as soon as possible. There are some paypal buttons on the site mainly on stock items and they include post to UK, E.U and Rest of World (ROW) .The prices are in sterling (English pounds), the price you see is the price you pay. Paypal will accept payments in your local currency but if in doubt mail I accept cheques in pounds sterling or can send an invoice in pounds .More ordering details are here. We never store or pass on customers details.

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  Baconsdozen.Imperial Tools
Mobile 07974435627.
Based in England we've shipped proper quality tools just about everywhere in the world.