Baconsdozen Whitworth,BSF and AF tools.

The quality will still be appreciated long after the price has been forgotten

For all the imperial nuts and bolts on classic,vintage and veteran cars,motorcycles,stationary engines and machinery made pre metric era. We sell British Standard Whitworth(B.S.W) ,British Standard Fine (B.S.F),British Association (B.A)  and A.F (Imperial Across Flats or S.A.E ) hand tools. Mail order worldwide.

Phone (part time as I attend auctions and autojumbles etc) 01493 600718, or call Mobile 07974435627

To e-mail , click here. Paypal accepted or credit card payments via phone.


Tool Blog.

Whitworth,BSF and BA tools

AF Imperial tools

Clearance Items.

Gunsons Colourtunes

Service and repair tools

 Hub and other sockets

Oils and greases


Spanner size tables.

Freeing seized engines

Fixing rusted fastenings

Waterproof gloves

Ordering etc.

Links page

Use links on left to go to pages of BSW,BSF (and BSC), BA or A.F (SAE) tools . Six or twelve sided,deep and standard sockets,cranked ring,open ended and combination spanners for hub nut,ball joint and crank pulley nuts etc available in imperial sizes.We have tools in BSW,BSF,BA and AF that nobody else does,and in different price and quality ranges to suit the DIY enthusiast, the professional mechanic or engineer in a classic car restoration workshop. Check the clearance page,most stock there,will not be replaced when sold.

Open end BA spanner set for electrical fixings etc.Combination wrenches in BA sizes.

BA sockets,combination and open end spanners

Deep,six sided Whitworth sockets in 1/2 drive.German made quality 1/2 drive whitworth sockets.

Deep or standard Whitworth,BSF,BA and AF sockets.

Six point AF imperial socket set on rail

Imperial socket sets.

Cranked ring (or box end) wrenches.Imperial sized.

Cranked rimg spanners

Use the imperial/metric tool size conversion charts, to help select the sockets or spanners you need,or to compare whitworth,BSF AF,BA and metric bolt head,nut,socket and wrench sizes and the different imperial and metric standards (UNF,UNC,SAE,BSW,BSF,BSC BA metric etc).These charts will also help select the correct ball joint,hub nut or other large specialised sockets . Why risk damaging the imperial fastenings on your precious car or motorcycle by bodging with 'nearly' fitting metric or cheaply made unsuitable tools when the correct tools are available and affordable from Baconsdozen ?  New arrivals and updates on special tools,clearance offers of surplus sockets and spanners etc in Whitworth,B.S.F,BA or AF are on the  tool blog..Please enquire for any tools you may need but can't find on the site.

A site map with links to all other pages,business and personal, on this URL  is here


Petrol engine compression tester.

Petrol engine compression testers .

Pressed steel type magneto spanner set on ring with points file.

Miniature and Magneto spanners.

Bi hex large imperial hub nut socket.

Hub nut and crank pulley sockets

Brutish standard whitworth thread gauge.

UNF,UNC,BSW etc thread gauges

Set of top quality Elora combination whitworth BSF spanners.

B.S.W. combination spanners.

Hand tools for full professional, or DIY use,quality assured.
Open end,combination,ring spanners and wrenches available in virtually all imperial sizes plus,impact or standard six and twelve point sockets in deep or standard lengths,available in socket or spanner sets or as individual items.Hub nut,ball and swivel joint sockets,injector and crank pulley or flywheel sockets in Imperial sizes.Various price ranges,tools suitable for use in a professional restoration work shop or DIY usage. I also sell feeler and thread gauges,carb setting tools, kits and adaptors,and more tools for car restoration,welding,tuning,servicing and repair etc .
Second hand tools.
I stock some second user surplus and old stock Imperial sized spanners,wrenches and sockets, servicing and tuning equipment suitable for classic or modern vehicles. I will buy stocks of similar surplus or used good quality tools.I also buy unwanted spares for older classic or collectors cars etc please contact me with details.
Ordering and payment.
I still prefer to do things in a more personal, old fashioned way,so you can phone on 01494600718 (or mobile 07974435627) to order with a credit card to hand. I often attend car shows,auctions and other tool sales so am not always on the end of a phone,you can e-mail and I'll answer as soon as possible. There are some paypal buttons on the site,mainly on standard stock items inc post to UK or overseas,I also accept cheques in sterling or can send a paypal invoice. I respect your right to privacy and do not store any customers details nor send out unsolicited e-mails. More details here.

Petrol engine compression tester.

Compression testers .

Welders self grip clamps for welding sills or wings etc.

Welding clamp set.

Combined vacuum and pressure gauge.

Vacuum gauges.

Brutish standard whitworth thread gauge.

UNF,UNC,BSW etc thread gauges

Set of quality Elora combination whitworth BSF spanners.

Whitworth (BSW),BSF and AF Spanner sets.


Imperial threaded nuts and bolts etc,some history and explanations.

Before the 1950s BSW and BSF threaded nuts and bolts (needing BSW/BSF tools) were commonly used on cars,motorcycles and machinery,after this date they were gradually phased out and replaced by the UNC and UNF threads (needing Imperial AF (SAE) tools).There are two 'standards' of Whitworth/BSF sizes (see foot of page) but the same spanners can be used on either .By around 1965 BSW and BSF were considered obsolete although they may still be found in later,specialised applications. By the end of the 1970s UNF and UNC had almost gone the same way,replaced by metric although they too can still be encountered in post 1970's machinery. Some cars,motorcycles,commercials,planes,stationary and boat engines and other machinery are old enough to use whitworth,BSF and BA fastenings using the wrong tools can cause damage to fastenings that are hard to replace and/or destroy the originality of the item.

Abbreviations and definitions used throughout this site.
B.S.W. or Whitworth
British Standard Whitworth,an early English thread standard,found on many veteran machines. Threads are coarse,angle 55degrees and the pitch is measured in threads per inch.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 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", "WHIT" or Whitworth and sometimes  "W/BSF" . Pretty much obsolete by the mid 60s but still found on some cars,motorcycles trucks,trains and machinery made after this. During the second world war the sizes of the heads of BSW and BSF bolts were reduced to save metal,all nuts and bolts were made one size smaller (ie) a 'new' 1/2 whit bolt had the same size head as the old 7/16.The war also emphasised the need for a universal standard in bolt sizes which eventually resulted in the introduction of the 'Unified' or SAE system which utilises AF spanners and sockets.
Society of Automotive Engineers.Established at the start of the ninteen hundreds this society was formed to establish accepted standards within the enginering and maufacturing industries.Some imperial AF spanners are marked 'SAE'.
British Standard Fine,in effect,a fine version of whitworth. (More threads per inch) Size again 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 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,an early thread standard used on small 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 common.
For spanners and sockets A.F stands for Across Flats 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 or 1/2 etc) or Millimetres. If the measurement is an exact inch fraction they usually simply referred to as 'Imperial' or AF and  normally used on UNC or UNF fixings . 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. If measured and marked in whole millimetres they are intended for metric threaded fixings and are simply called metric.
UNC and UNF.
Unified Coarse or Unified Fine,the thread standard that superseded B.S.W and B.S.F etc. Fast becoming obsolete but commonly used on many vehicles late 50s to 80s or later . Most UNC and UNF fittings need the use of AF (Inch based) tools.
Box spanners.
In USA and some other countries the ring end of a combination or ring spanner is called a box.In UK and others a box spanner is a tubular spanner used to access deeply recessed nuts and bolts.The spanner is normally turned by a detachable tommy bar. Deep sockets will do the same job unless the nut is very deeply recessed and/or access around it is limited as box spanners are normally six sided and thin. Strength however of box spanners is limited and they tend to spread if excessive force is used on them.
Six point sockets (hex).
Sockets can be six point (shaped inside as a hexagon) sometimes called mono hex,most impact sockets are six point and coloured black.Rarely 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.
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.
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. We regard Whitworth,BSF,BA and AF as Imperial tools.We dont sell the types of sockets and spanners that are supposed to fit everything from mm to torx and Whitworth. We consider the correct tools for imperial sized fastenings is the imperial sized spanner (or socket) made specifically for it. There are very few imperial tools that  we can no longer source,in these cases and where even a second user tool is not in stock,where a metric tool is very close in size we can probably supply a suitable one as an equivalent.  We have many,many more tools available than the selection that is shown on the web site.
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.
You can write to us at .
Baconsdozen,Whitworth House.
23 Common Road
Norfolk NR310QF
We are based in England but can ship tools just about anywhere worldwide.
Tel 07974435627 (Mobile)