Alright, After another precision bit blown up in pieces (also ticking the screw, damn spanner screws), I've decided to switch to quality ones. Bolt Measuring Guide IDEAL BOLT MEASURING TOOLS - For precision measuring we would recommend the use of Digital Vernier Calipers and a Thread Gauge to measure thread pitch. If you count 9 lines, the size is a 9-mm (millimeter) nut. Some spanner wrenches have the size printed on the handle. 125SP14A-5 (Pack of 5) Wrench time does not include obtaining parts, tools or instructions, or the travel associated with those tasks. Spanner Jawsize conversion chart. Interestingly before around 1920 the measurement was made to the diameter of the threaded part of the nut rather than the outside of the nut. As great as spanner “snake eye” bits are for adding security to an assembly, they also have some downfalls. Inches: Millimetres: Spanner: 0.250: 1/4 AF: 0.276: 7mm: 7mm: 0.313: 5/16 AF: 0.315: 8mm: 8mm: 0.344 Use a ruler to measure diameter if you don’t have a bolt gauge. Spanner wrenches come in various sizes from 4 inches to 18 inches in length.To determine what size spanner wrench you have, measure from the end of the handle to the edge of the fixed side of the vice. Move your ruler or tape measure to the circle within the star points of the tip of the Torx-head screw. Make sure your measurement is in a straight line across the thickest portion of the bolt. Professional Grade 1/4" Hex Shank #14 Spanner 1" Insert Bits. The size of the spanner refers to the size of the nut or bolt that will fit into the jaws. Whitworth wrenches are needed on your old Austin, Rolls Royce, Bentley, Jaguar, or other old British made … Measure the shaft. Spanner bits are made to fit a very specific drive size. They are either measured in Metric (millimeters) or Imperial measurement (inches or thousandths of an inch). The Problem With Spanner Bits. Wrench time is a measure of crafts personnel at work, using tools, in front of jobs. For example 7/16 Whitworth to mm size. Finally, screw the spanner rack into its final location on the wall, or the side of a wall cabinet or cupboard, and place your spanners on the spanner rack; ranking them in size order e.g. It does not include traveling to or from jobs. VEGA Spanner #14 Insert Bits. Measure from the outermost edge of the bolt’s thread on one side to the outermost edge of the thread on the other side. Stretch the tape measure across the nut's diameter to the flat-side directly across from the one your pulling from. Unlike other driver measuring systems, the same numbers on a Torx screwdriver apply to both SAE and metric scales. If they are used with the wrong size it becomes increasingly likely that the bit will break. You can identify the size required for a random screw by measuring the width of the slot and comparing it to a Torx sizing chart. Torx Sizes Chart For standard bolts in the range of M4 – M12, we offer our own Pro-Gauge £5.83 the smallest spanner on the right and the largest size spanner on the left, to make it easier and quicker to find the correct spanner … Torx drives use a numbering system based upon the distance between two opposing points. Unfortunately, at my local hardware store when I asked some information about "good quality bits" they told me that they can order Swiss tools ones or other brands like Maurer, Stanley, Beta ones. This table can help you measure Whitworth spanner sizes. Measure the width of just the circle. If the nut is metric, count the number of lines on the tape measure to find the measurement. Compare your measurements with one of the online charts at Home Metal Shop Club or Wiha Tools (see Resources) to see what size Torx bit must be used for the Torx-head screw you have. You can find the Whitworth to metric conversion for any British size wrench. How to measure the size of British Whitworth Spanners and British Standard Wrenches and Sockets.