The metric chart will also list the tap drill size in both millimeters and also the site that is equivalent or approximate to North American drill sizes. Trusted. Screw sizes come in two different measurement classifications called Standard (SAE) and Metric. One final note is that depending on the number of threads, your fastener can have different values for its Minor Diameter. Metric Tap & Drill Chart for 75% Thread Depth To the best of my knowledge the following information is accurate. As an Amazon Associate we earn from qualifying purchases. That’s because there are so many variables to consider; from your screw size, its thread pitch, the substrate you’re drilling into and even whether you require a close fit or free fit connection. Two classes of sizes are list in these columns. The second number is the UNF (Unified National Fine) pitch. Sometimes the best way to understand something completely is by an example. You research and determine an SAE  “12-28” bolt will do the job of securing your pieces together. Of course, you’ll find yourself working with metric bolts often enough. In our drill tap chart, we designate two different sizes based on how strong the substrate is (material you’re tapping). If you want to learn on these differences, this video explains the above in much greater detail: This NPT (American National Standard Pipe Threading) chart is very easy to read. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. Simply put, if you tap a hole you’re cutting threads evenly into it. Not to worry though, these are also standard based on the number of threads. M5 M10. Speaking of easy, we even look at a helpful trick, which uses a quick work-around calculation to find tap drill sizes you need. BROWNELLS. Drill Size Decimal eQUiValent tap Size 80 .0135 1 79 .0145 64 .0156 78 .0160 77 .0180 76 .0200 75 .0210 74 .0225 73 .0240 72 .0250 71 .0260 70 .0280 69 .0292 Also known as Heli-Coil inserts, the inserts have coils that expand once installed to securely anchor the insert. M16 X 1.50 14.50mm .5906 15.25mm .6004 M18 X 2.50 15.50mm .6102 39/64 .6094 M18 X 1.50 16.50mm .6496 17.25mm .6791 TAP/DRILL SIZES Drill sizes given are the ‘closest’ drill size. The second column will list the size of the tap drill you need to use. Then, added a professional type "T"-handled tap wrench, and a complete cross reference chart showing the proper tap-hole drill and clearance drill size for each tap included. View Range. Standard sizes are broken up into two different classes: a small diameter set and a larger diameter set. For sizes less than 1/4″, fractional measurements are not used. [mm] [mm] [inch] 6H mod.) 0-80 3/64 .0469 54 .0550 1-64 53 .0595 51 .0670 1-72 53 .0595 51 .0670 2-56 50 .0700 5/64 .0781 2-64 50 .0700 47 .0785 3-48 47 .0785 43 .0890 8.40 Q. The third and final column tell you what size drill bit to use to cut a hole to tap into. Size: 1 1/4" x 5/8". This is just the thread count, or threads per inch (TPI) that the screw you’re using is designed for. Thread Size: M16-1.50. 12 size bolt on the far left column. So for example, take a screw size of M12 with a thread count (pitch) of 1.5. The goal is to make this an easy reference for you, whether you’re a casual DIY’er, hobbyist, student or experienced machinist working in a shop using top of the line Starrett tools. Or, you may want it to fit less snug and have a little clearance. With all this, you need a quick and handy reference that takes all these specs into account and lays it all out in a single organized table. This is pretty self explanatory, and again you’ll see the differentiation on the pipe tap drill chart. Thread Limit is a standard notation system indicating a level of tolerance for the thread outside the basic thread size of the tap. There’s an old shortcut you can use to quickly find metric tap drill sizes – with the help of a little grade school math. Soft materials include copper, aluminum and all types of plastic. Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial M1.5 x 0.35 1.5 0.35 1.15 ... M16 x 1.5 16 1.5 14.5 37/64 15.00 19/32 Tapered vs straight pipe tapping. Basically, the more threads, the bigger the minor diameter number. Each fastener size in the Standard specification has two possible threads-per-inch values for screw sizes #1-to-#10. Major Diameter. They simply follow the formula of 1 divided by the number of threads per millimeter. The chart below is for NPT pipes. Select a store to see pricing & availability SAE Or Metric: Metric. 8.80 9.50. Specifically, the first number is called the UNC (Unified National Coarse) pitch. For example, a 7/16″ screw size can have a 14, 20, or 28 threads per inch as listed in the appropriate column on the chart. Drill Size. Metal set containing taps ranging from M3-M12 with a first, second and third cut tap in each size. With a drill bit point to drive into the workpiece, these tools can drill and tap holes in a single step. Standard pipe threads vs dry fit, and 2. What follows is some practical instruction on how to use a chart for tap drill sizes, including a useful guide for each section of the matrix. It’s just like selecting drill bit sizes for regular drilling, except that tap drill sizes are assigned to match industry standard sized holes for tapping. You’ll see that for heavy duty materials like steel, the correct tap drill size is “10” (or a 0.194 inch diameter tap). All have a prong for ease of installation. Consider the material you’re securing your attached piece to. It gets a little complicated though, so our tap drill chart simplifies it for us, thankfully. Drill Size (mm) Closest American Drill Drill Size (mm) Closest American Drill. Thread limits have been established to provide a choice in the selection of the tap size best suited to produce the class of thread desired. of the internal thread (Tol. More about these later – and a tap chart is still going to be helpful! Compare. In recent years, manufacturers have developed combination drill-tap bits for use in power drills. Size Equiv. Pipes are the other common application for tapping. Drill and tap holes in a range of diameters. “0” of course is the smallest with “12” being the size just before you get to 1/4″. Let’s review each in more detail so you can use the chart efficiently. The last segment of the tap drill chart are the columns on the right third of our table. Of course screw-type fasteners are not the only hardware you can tap for. Each value listed here corresponds correctly to the tap drill sizes on to the left, which of course match to the size of your bolt or screw and thread type. wood working, woodworking, finish work, finish woodworking, fuller, wl fuller, w.l. The best quality drill bits guaranteed. For the sake of our tap drill chart, we’ll see this range go from 1/4″ up to 1″ to correlate over to our tap drill sizing. To Tap For This Size . They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. The first column is the size of the screw or bolt you’re using. TAP – DRILL RECOMMENDATIONS Tap Size Cutting Taps Forming Taps and Drill Decimal Drill Decimal Pitch Size Equiv. 3/8 15.50. Instead, a numbering system has been created and ranges from 0-12. Most of us are all to familiar with Standard sizes since North American uses these primarily from furniture to machines and other equipment. Just keep in mind that metric drills don’t use a “thread per millimeter” for the thread pitch. Drill Size (mm) Closest American Drill ... M16 M17. It’s easy once you’re familiar with reading the chart from left to right. [mm] D 1STI min. Clearance Drill. MINOR thread dia. If you take your screw size (in mm) and subtract it’s pitch value, you get your answer. Every tap is tapered for the first few threads to help create an easier start to the cutting process. The main physical differences between NPT and NPTF are the flatness of the peaks and valleys of the threads. For the sake of our NPT tap drill chart, you simply need to know the distinction between an NPT fitting and NPTF. 29pc Metal Hand Tap Set Prices from £47.50 £39.58. You do not have to drill and tap any item in this kit. Finally, determine if a tight fit or one with a more “open” clearance is adequate. M20 7.40. TAP DRILL SIZE CALCULATORS UNC/UNF CUT TAPS - Special Percentage of Thread Requirements Drill Size = Basic Major Diameter - 0.01299 x desired % of thread* threads per inch M/MF CUT TAPS - Special Percentage of Thread Requirements Drill Size (mm) = Basic Major Diameter - pitch x desired % of thread* 76.98 For example, a 5/16 drill size equates to 0.313 inches for soft metal drilling. Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) AR-15/M16 Barrel Extension Torque Tool AR-15/M16 BARREL EXTENSION TORQUE TOOLS. ... Century Drill & Tool Metric Tap Part #: 96327 Line: CDT. Finish: Anodized in three custom colors. With metric threads tapping drill size is easy to work out because it is the bolt diameter minus the thread pitch so, for example, a standard pitch M16 bolt has a pitch of 2.0mm so the tapping drill size is 16 – 2 = 14mm. Plus, a 1 oz. Nearest . It’s easy, check the chart by finding the No. sample of Do-Drill™ (the world's best drill/tapping oil) in a dropper-top bottle, and a tough, compact bench box. You’ll also want to know the bolt’s corresponding Major Diameter. When you buy a tap or die, it will be marked with three distinct numbers: 1. its diameter, 2. its threads per inch (pitch) and 3. the type of threads it cuts. Let’s say you need to repair something on your car, or maybe you’re building a machine or structure. Here’s an example: To learn more about pitches beyond what’s included in the drill and tap chart, you can download a PDF covering bolt/screw pitches. Assortments include various sizes of helical inserts and a tap, a drill bit, and an installation tool for each thread size. HomeRepairGeek.com All rights reserved. For sizes greater than 1/4″, fractional sizing based on the actual diameter of the screw is used. Drill Size Decimal eQUiValeNT Tap Size 19 39 32 .5938 64 5 .6094 41 8 .6250 64 21 .6406 43 32 .6562 3/4 - 10 64 11 .6719 45 16 .6875 3/4 - 16 64 23 .7031 47 32 .7188 64 3 .7344 For example, reading across you’ll find that a 1/8 NPT tap will require an “R” size tap drill. Screw Size. Recommended tap drill size P [mm] D STI min. L 7.70. M12 M14. Standard pipes (shortened to NPT) is the American National Standard Pipe Threading (ANSI) distinction. of the internal thread (Tol. Knowing the size is only the first part of the puzzle. In our tap drill chart for Standard sizes, the smaller pitch number on top is the coarser thread type with the other one (or two) being finer. Decimal : Inches. Century Drill & Tool Metric Tap Part #: 97306 Line: CDT. The American National Standard “Dry Seal” Pipe Threading (NPTF) is self-sealing. NOMINAL SIZE NPT NPTF NPSC NPSM NPSF NPSI BSPT BSPP The next set of columns in the tap drill chart simply correspond with the size of your screw listed on the left side of the chart (and just covered above). These specialist drill bits are used for drilling centre holes at two different angles, 60 degrees and 90 degrees. Bear in mind, this does not take into account coarse or fine thread counts for any given size, but it does give you an approximate size. The last segment of the tap drill chart are the columns on the right third of our table. Depending on the project and job of the fastener you may need it to screw tightly into its shaft. Imperial Grades IBF/IN2 (PSI) Metric Classes MPA (N/MM2) L9 -- 180,000 PSI -- HIGH TENSILE: CLASS 12.9 -- 1,200 MPA -- HIGH TENSILE: SAE GRADE 8 -- 150,000 PSI -- HIGH TENSILE Keep reading! All edges have been rounded and de-burred for the shooters safety. The table below gives tapping drill sizes for threads corresponding to the thread pitches given in the table on page 3. Bolt or Screw Material: The GG&G Benelli Tactical Bolt Release Pad is manufactured from 6061 T6 aircraft grade aluminum. The limits are identified by a letter "H" for inch or a "D" for metric, followed by a number. View Product. And the bottom number in the stack is UNSF for “Super Fine”. £50.65 * Barrel Tools. You can read it the same way as the SAE chart. 溜v§oÖb"ûú—öpĆ gÿèéÀ5R,žÝÁÛwýb.4ê?üãŒSÎY¤Ø ¾9‹ª¤¤bòˆÙ(—€ëÜw`°‹®ŽÙÊúKà‚ð6JS92G»ð!,æ‘~å’SÞ$œÁ´ZJu/58ŒŒçCà¯b€Í’ð6üËXOøÊ!+ã«ÀìÃíbþš\ç!+kÑ׸Gۜg47׃w‡3Ì zžq:/{â§ç sï½ò¹û%þÄ>GæZò¿3cåθRƒ£ã,Ž\D@‡Ë‹(8bbAû‚@SM À5q>Uâp_ÎðNÌǢ˙a÷ñ`ýŸCkä„ðaòaŒˆü|x[GrbáDdšr­ÿ3Ȩ“pÂÆF>. Find the drill bit size that matches up in the row the same way you just found the tap drill value. In the chart, you simply find the number that relates to your fastener. One for closer or tight fits and one for looser fits. For sizes #12 and larger, there are three thread count sizes. This is merely the distance between the two outer ridges of the threading, and is included in the tap drill chart for easy reference. These different pitch values simply relate to how coarse or fine each threading is. There are two things to note when tooling pipes: 1. This is the clearance drill size conversion, or the more plainly, the size drill bit you need to cut your initial hole before carrying out the rest of your tooling. © Copyrights All Rights Reserved Thor International Pte Ltd, 2019 [mm] D 1STI max. 6H mod.) This may seem to complicate things but again, a good tap drill chart will list all the possible thread counts to help you match the appropriate tap drill size. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. You’ll also want to know the Pitch of your screw. A tap drill cuts the female threads and is placed down into a pre-drilled hole and turned with a special wrench. This info tells you what size tap to use for each fastener size. DRILL SIZE SELECTOR STI 5 STI-M ISO Metric coarse thread DIN 8140-2 for wire thread inserts Nominal Size MAJOR thread dia. Icon. When finding a tap drill size for your fastener in a tap drill chart you need a little more information about your fastener. Otherwise, let’s run through an overview of the chart so you can use it without confusion. From here, simply slide over and find the corresponding tap drill size in the row that lines up. Metric tap drill size calculator Reference: ISO 68-1:1998(E) - ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads Let’s look at one briefly. This is really helpful if your toolbox or workshop doesn’t have a lot of the metric sizes available. We divide these up into soft and hard materials. Connect them directly to drills, power screwdrivers, and other tools that accept a 1/4" hex shank. When using a tap drill conversion chart, make sure you know what size fastener you’re using. Joining pipes together with threaded connections requires similar knowledge when it comes to creating pipe threads. TAP DRILL SIZES - INCH & METRIC with DRILL SIZE FORMULAS ENGINEERING DATA. For example, a 5/16 drill size equates to 0.313 inches for soft metal drilling. A 3/8 NPT tap will use a 37/64 size and so on. Warranty: Lifetime. An NPT thread requires a sealing agent such as lubricant or tape in order not to leak any fluid it conveys. M18 M19. M16 x 2.0mmHSS Hand Taps (Singles & Sets) Prices ... second and third cut tap in each size. Pipe tapping can either be tapered or straight. Because it can be complex however, a helpful chart is only of any assistance if you can understand it and read it quickly. M9 M7. 25/64 16.75. Fraction. You’ll see one column for each. Harder substances are found in industrial use and typically refer to stainless steel, steel, iron and titanium. Getting Your Pre-Dilled Hole to the Right Size. The drill size chart below contains all commonly used centre drill bit sizes. It’s almost impossible to know what size tap drill to use for your screw or bolts without a good tap drill chart at hand. The good news is that each screw size has just one major diameter. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.. Available in four custom colors. The chart will list two values for tap drill sizes; the standard drill size and it’s decimal equivalent in inches. 10+ In stock, delivery from Brownells USA within 7-10 days 10+ In stock, delivery from Brownells USA within 7-10 days. You can buy taps (and dies for cutting outer or male threads), in kits that come with the required wrench. You need to bolt together two difference pieces made of hard metal like steel. Tap Drill. So what the chart shows you here is the proper tap drill size that you can use to match the bolt or screw you’re cutting threads for. The chart will list two values for tap drill sizes; the standard drill size and it’s decimal equivalent in inches. TIP:Check out our full chart below to find all tap drill size equivalents for SAE and metric. “12mm – 1.5mm = 10.5mm”. In a nutshell, a good tap drill chart like the one below or a printable PDF version will have three main columns or sections.