Sets of bits in 1 mm increments might be found on a market stall. Bits at size increments of 1 mm are most commonly available, and lowest price. The price and availability of particular size bits does not change uniformly across the size range. This reflects both the smaller drilled hole diameter tolerance possible on smaller holes and the wishes of designers to have drill bit sizes available within at most 10% of an arbitrary hole size. In smaller sizes, bits are available in smaller diameter increments. For example, British Standard BS 328 defines 230 sizes from 0.2 mm to 25.0 mm.įrom 0.2 through 0.98 mm, sizes are defined as follows, where N is an integer from 2 through 9:įrom 1.0 through 2.95 mm, sizes are defined as follows, where N is an integer from 10 through 29:įrom 3.0 through 13.9 mm, sizes are defined as follows, where N is an integer from 30 through 139:įrom 14.0 through 25.0 mm, sizes are defined as follows, where M is an integer from 14 through 25: Standards organizations define sets of sizes that are conventionally manufactured and stocked. Metric drill bit sizes define the diameter of the bit in terms of standard metric lengths.
#Letter drill size chart series
The case that holds them in an indexed order (by size), via a graduated series of holes, is called a drill index. Enable this option to display the drill symbols.Metric drill set, 1.0–6.0 mm by 0.1 mm, jobber length.
#Letter drill size chart software
The software includes 15 pre-defined symbol styles as shown in the image below. Symbol - select to use a symbol at each hole site.These options control the symbol style and size: Graphic SymbolĮach hole site can be represented by a symbol, a letter or a string showing the actual hole size. But if Pad Shape is enabled in Grouping, they will be assigned separate symbols. If Pad Shape is not enabled in Grouping, they will be assigned the same symbol. For example, the design could include a round pad with a 1mm hole and another square pad with a 1mm hole. Holes are clustered initially by hole size and then assigned separate symbols whenever a grouping option that uniquely identifies them is enabled. GroupingĬlick the Grouping button to set which properties are to be used to control the assignment of symbol-to-drill events (holes). Click a second time to reverse the sort direction. A small triangle will appear indicating the current sort direction.
To sort the drill symbols, click once on a column heading to sort by that column. It can be customized by clicking on and dragging a column header to change the order of columns and right-clicking on a column header and enabling/disabling the checkbox to show/hide the column. The grid area displays detailed information about the mapping of a symbol to a hole size. From the Drill Drawing tab of the Gerber Setup dialog, click the Configure Drill Symbols button.
#Letter drill size chart pdf
The Layer Properties dialog is accessed by editing the Drill Drawing layer in the PCB Printout Properties dialog or from the PCB Printout Settings page of the Smart PDF Wizard.
From the PCB Properties panel when a Drill Table is selected, click the Drill Symbols button.The Drill Symbols dialog can be accessed in the following ways: The Drill Table is configured in the Drill Table mode of the Properties panel the assignment of symbols/letters to hole sizes are performed in this dialog. The drill symbols are always configured in the Drill Symbols dialog and the assignments remain consistent for a PCB. Each drill size can be represented by a symbol, a letter, or the actual hole size. The drill table lists the size and number of holes for each drill used on the board. A standard element required for the manufacture of a Printed Circuit Board is a drill drawing table, also known as a drill table or a drill drawing legend.
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