Free resources · Printable charts
Free printable drill, tap and grit charts (PDF)
Seven reference charts are free to download as PDFs, each in US Letter and A4: drill bit sizes, tap drills, screw pilot holes, sandpaper grits, hole saws and pipe sizes, router bit speeds, and saw blade arbors. Every figure on them comes from the same manufacturer data and standards behind the AccessoryFit chart pages, and each sheet prints its sources and check date at the foot. They are licensed CC BY 4.0, so a workshop, school or trade counter can print, pin up and share them freely with credit.
On this page
Drilling, tapping and screw charts
Three sheets cover the questions asked most often at a drill press or bench.
- Drill bit size chart. Fractional, number, letter and metric drill sizes side by side, each with its decimal-inch and millimetre equivalent, so a number or letter drill can be matched to the nearest fractional or metric bit. The online version is the decimal drill size table.
- Tap drill chart. Tap drill sizes for UNC and UNF inch threads and for ISO metric coarse and fine threads, with the thread's major diameter and pitch kept on the same row. The online version is the tap drill size chart.
- Wood screw pilot hole chart. Pilot holes for hardwood and softwood, shank clearance holes and head bores by screw gauge, with metric screw diameters. The online version is the screw pilot hole chart.
- Drill bit size chart, US Letter Fractional, number, letter and metric sizes with decimal equivalents.
- Drill bit size chart, A4 The same chart laid out for A4 paper.
- Tap drill chart, US Letter UNC, UNF and ISO metric coarse and fine threads.
- Tap drill chart, A4 The same chart laid out for A4 paper.
- Wood screw pilot hole chart, US Letter Pilot, clearance and head-bore sizes by screw gauge.
- Wood screw pilot hole chart, A4 The same chart laid out for A4 paper.
Sandpaper grit chart
The sandpaper grit conversion chart matches US CAMI grades to the nearest European FEPA P grades by average particle size in microns. It is the sheet to keep by the sanding station when a project mixes US and European abrasives, because the same number does not mean the same particle size in both systems once you get past the coarse grades. Where published sources disagree on a value, the sheet says so in its notes rather than picking one quietly. The online version is the sandpaper grit chart.
- Sandpaper grit conversion chart, US Letter CAMI and FEPA P grades matched by particle size.
- Sandpaper grit conversion chart, A4 The same chart laid out for A4 paper.
Hole saw, router and saw blade charts
Three sheets cover cutting accessories, where a wrong size or speed costs more than a wasted hole.
- Hole saw and pipe size chart. Electrical knockout hole sizes by conduit trade size, pipe and tube outside diameters, and bi-metal hole saw speeds by diameter band. The online version is the hole saw size chart.
- Router bit speed chart. Maximum router speed by bit diameter from a manufacturer safety sheet, with per-bit speed ratings from a router bit maker as examples. The speed marked on the bit itself always takes priority. Background on bits and profiles is in the router bit guides.
- Saw blade size and arbor chart. Circular, miter and table saw blade diameters with US arbor sizes and European bores, plus example speed ratings. The online version is the circular saw arbor size guide.
- Hole saw and pipe size chart, US Letter Conduit knockouts, pipe and tube sizes, hole saw speeds.
- Hole saw and pipe size chart, A4 The same chart laid out for A4 paper.
- Router bit speed chart, US Letter Maximum speed by bit diameter, with maker examples.
- Router bit speed chart, A4 The same chart laid out for A4 paper.
- Saw blade size and arbor chart, US Letter Blade diameters, US arbors and EU bores.
- Saw blade size and arbor chart, A4 The same chart laid out for A4 paper.
Where does the data on the charts come from?
Each sheet is generated from the same fact base as the matching AccessoryFit chart page, so the PDF and the web page always carry the same figures. The data comes from manufacturer catalogues and manuals, standards bodies, engineering references and specialist suppliers; the publishers used are printed at the foot of every sheet, and the full references sit under each online chart page. Nothing on the sheets was measured by AccessoryFit.
Inch and millimetre conversions are calculated, and the sheets say so. Where sources disagree, or a row rests on a single source, a note on the sheet says that too. Each PDF carries the date its data was last checked; when a source changes, the online page is corrected first and the sheet is regenerated from it. The rest of the site's data work, including injury and safety statistics, is collected under AccessoryFit research.
Who are the printable charts for?
The charts are made for anywhere a phone is not the quickest way to check a size. A home workshop can pin the drill and tap charts above the drill press and the grit chart by the sander. Makerspaces and community workshops can put them beside shared tools, where members arrive with different habits and different measuring systems. Schools and colleges can hand them out in design and technology, construction or engineering classes, and include them in course packs. Trade counters and tool hire desks can keep them at the counter to answer the questions customers bring in, such as which drill to use before a tap or which grit replaces a European sheet.
Because each sheet shows both inch and metric values, and both US and European systems where they differ, the same printout works on either side of the Atlantic.
How do you print the charts so they stay readable?
Choose the paper size that matches your printer: US Letter in North America, A4 almost everywhere else. Print at actual size (100 percent) rather than fit to page, so the text keeps its intended size and the table columns stay aligned. The router and saw blade sheets fit on one page; the drill, tap, pilot hole, grit and hole saw charts run to two or three pages, so print them single-sided if you plan to pin the pages up side by side.
In a workshop, a laminated sheet or a clear plastic sleeve keeps off dust, oil and coolant. Black-and-white printing works for every sheet. Keep the footer with its date and sources when you trim a page, so anyone reading it later knows how current it is.
A printed chart is a quick lookup, not the last word. Before tapping a thread or fitting a blade, check the marking on the accessory and the tool's manual: a router bit's own speed rating, a blade's marked maximum RPM and a tap's stated drill size all take priority over a general chart. When you are unsure, the online chart page explains each column and links to the guide behind it.
Can you share, post or reprint the charts?
Yes. The charts are licensed under Creative Commons Attribution 4.0 (CC BY 4.0). You may print them, copy them, post them on a website or intranet, include them in teaching material and hand them out, including commercially, as long as you credit AccessoryFit and link to this page. A suitable credit line is: Chart: AccessoryFit, https://accessoryfit.com/printables/, CC BY 4.0.
Please don't remove the source notes or the check date from the foot of a sheet. If you adapt a chart, for example by cutting it down to the sizes your shop stocks, say that it has been changed.
Questions readers ask
Are the printable charts free to use in a classroom?
Yes. They are licensed CC BY 4.0, so teachers can print and distribute them, or include them in course material, with a credit to AccessoryFit and a link to this page.
Which paper size should I download, Letter or A4?
Download the one your printer uses: US Letter in the United States and Canada, A4 in Europe and most other countries. The content is the same; only the page layout differs.
Why does a printed chart differ from a chart on another website?
Charts often round differently, mix sources or leave out the standard a value comes from. Each AccessoryFit sheet names its sources and flags conversions and disagreements, so you can trace any figure back to where it came from.
How often are the PDF charts updated?
When a source changes, the online chart page is corrected and the sheet is regenerated from the same data. The date at the foot of each sheet shows when its figures were last checked.
Where to go next
- Drill bit size chartThe online chart, with full references.
- Tap drill size chartInch and metric threads in more detail.
- Free accessory diagramsIllustrations of shanks, arbors, discs and bits to reuse.
- Power tool research and dataInjury, noise and vibration data with downloads.