Draper 3mm X 3.5mm Elora Midget Double Open Ended Spanner SPANNERS AND WRENCHES

Product Information

All of these spanners can be used for different professional and DIY tasks and each has their own benefits. In engineering circles a Spanner is often called a wrench and is generally used to grip a nut or bolt while applying torque or put more simply to help you fasten and loosen nuts and bolts. Certain branches of industry used Whitworth fasteners with a smaller hexagon (identical to BSF of the same bolt diameter) under the designation "AutoWhit" or Auto-Whit[citation needed] [6] and this series was formalised by the British Engineering Standards Association in 1929 as standard No. 193, with the 'original' series being No. 190 and the BSF series No. 191.[7] by British Engineer Sir Joseph Whitworth (1803 - 87). It is used in many types of engineering throughout the world,

First of all, there are lots of types of spanners and sizings which you will need to identify for the intended task, whether it’s plumbing, fixing a car or DIY. So before buying a spanner make sure you know exactly what you need! Most lists of spanner sizes are divided into 2 rows, Nominal Size and Spanner size.What Size Spanner do I need ?” is a common question. Theimmediate answer is another question: “ What type of thread does your nut and/or bolt have?” The parts arrived today and both the set-screws and the nuts were smaller than the fasteners on my bike. 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 11.3mm (a 3/16 Whitworth spanner size) So - what is the correct across the flat measure for a 1/4" Whitworth nut? And if my spanner / tables are correct at 13.335mm across then why do all the suppliers think they should send me the equivalent of 3/16? Combination spanners have either a doubled ended traditional spanner, or a spanner and a ratchet. The old method of how you used to measure the size of a spanner used to be; the spanner size was named after the fastener size.

Whitworth fasteners with the larger hexagons to BS 190 are now often colloquially referred to as 'pre-war' size, even though that is not strictly correct. Trying to match your spanners and bolts can be a confusing and frustrating process. You hear a lot of phrases and words being thrown about, ‘M5’ this and ‘M12’ that, and you may not understand everything being said. This guide is here to help you, and hopefully give you a better understanding and put a stop to the confusion once and for all! Types of Spanners: For example if you were using a ¼’’ fastener size on a ¼’’ thread, the spanner would be called a ¼’’ Wide spanner. However the gap in the spanner would be 13.34mm wide, and ¼’’ is 6.35mm. Seems confusing, right? This method throws people off and only really applies if you’re using equipment and tools from pre 1970’s. Fastener Size SAE: Society of Automotive Engineers (American Standardoriginallyestablished for the automotive industry) Anyone out there that can explain the Whitworth sizing to me? I had read that the sizing on Whitworth spanners was to indicate the thread size and not the size of the hex-head so when I wanted to replace some fasteners with stainless I used the spanner size as a guide (1/4" spanner in this case). I also measured the hex flats (13 and a bit mm) and matched this to some tables that I found which indicated that this was 1/4" BSW.The M stands for metric and the number after the ‘M’ refers to the width of the thread on the fastener in millimetres.

During World War II the smaller size hexagon was adopted more widely to save metal[8] and this usage persisted thereafter. Thus it is today common to encounter a Whitworth hexagon which does not fit the nominally correct spanner and following the previous example, a more modern spanner may be marked ​7⁄16 BS to indicate that they have a jaw size of 0.710 in and designed to take either the (later) ​7⁄16 BSW or ​7⁄16 BSF hexagon.[9][10][11] A standard metric M6 nut will be 10 mm across the flats, a 1/4″ UNC is just under 11mm and a 1/4″ BSW just over 11mm. Attempting to use the incorrect (oversize) spanner could cause the spanner to slip, rounding off the edges of the hexagon.You should also be aware that the size given to any nut or bolt is relevant to the thread type and size. A metric M6 nut for example means the measurement ‘d’ shown above is approx. 6mm and this ‘M6 – 6 mm’ measurement bears no resemblance to the distance across the flats, or the spanner size required. For example, a ½” fastener fits a spanner with a ½’’ head. Metric fasteners often use a different sizing system to metric spanners, which could cause confusion, as the fastener size relates to the thread size rather than the head size. Metric Size