A tap cuts threads inside a drilled hole; a die cuts threads on the outside of a round rod. To use either tool successfully, match it to the intended thread specification, keep it aligned as it starts, and follow the tool maker’s guidance for lubrication and cutting.
What taps and dies do
- Tap: cuts or restores internal threads in a hole.
- Die: cuts or restores external threads on a round rod.
A hand tap-and-die set is useful for making threaded connections or repairing existing threads. The tool must match the thread you need; choosing one by appearance alone is not enough.
Choose the thread and matching sizes
Identify the required thread standard and size first. For a tapped hole, use the set’s tap-drill chart or a chart for that exact thread specification to select the drill size. Do not guess: a hole that is too large can leave an incorrectly sized internal thread that may fail when tightened or put into service, as explained by Park Tool’s basic thread concepts guide.
As a rough metric guide, Accu describes subtracting the pitch from the thread’s major diameter. Its example for M6 × 1.0 gives a 5.0 mm drill. Treat that as an approximation, not a substitute for the chart and specification required for your work: Accu’s thread-cutting guide.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →#1 Best Overall
- ALL-IN-ONE TAP & DIE SET: This 80-piece internal and external threading tool kit includes both coarse and fine taps and dies in the 34 most needed standard and metric sizes, from #4 (14/125") to 1/2 inch and from M3 to M12
- USER-FRIENDLY DESIGN: This tap and die set is engineered to tight tolerances to meet professional needs; the tap ends are 1/5 to 2/5 inch long for easy use with the provided standard and metric wrenches
- PREMIUM DURABILITY: This threading tool set for homeowners, craftsmen, and mechanics is made of high-carbon chromium bearing steel; provides even greater strength, durability, and longevity so you can tackle any job with confidence
- ADDITIONAL TOOLS: In addition to the 68 taps and dies, this tool set includes protective gloves, both long and T-handle wrenches, 1/8" flathead screwdrivers, and thread pitch gauges to find and carve the exact threading you need through wood, copper, aluminum, iron, steel, and more!
- BLOW-MOLDED CASES: Separate sturdy storage cases store and organize the SAE and metric taps and dies, providing easy organization and portability wherever you need them
For a die, choose the size that matches the intended thread on the rod. Before buying or using a set, check its thread system and size coverage, whether you need internal or external threading, and whether it includes the appropriate tap wrench or die holder and a drill chart. For a blind hole or specialized thread form, verify the correct tap type and thread standard rather than assuming a basic set is suitable.
Cut an internal thread with a tap
- Confirm the thread and drill size. Match the tap to the required thread and use the corresponding tap-drill chart to prepare the hole.
- Secure the workpiece. Hold it firmly so it cannot shift while you cut.
- Fit the tap in a tap holder and align it squarely. The first turns establish the thread’s axis, so take care to start straight.
- Cut in short cycles. Turn the tap two to three full turns, then reverse it one-half to three-quarters of a turn to break the chip. Repeat this cycle as needed to make the thread.
- Use cutting fluid as directed. Follow the tool manufacturer’s recommendation for the material and tool.
This hand-tapping sequence is described in IRWIN’s guide to using a tap and die set, updated October 3, 2022.
Rank #2
- ▲ PREMIUM MATERIAL AND DURABILITY - Industrial grade GCr15 bearing steel construction ensures durability and tool longevity to withstand professional uses
- ▲ EXCELLENT CUTTING PERFORMANCE - All cutting teeth are precisely CNC machined and accurately heat treated to Rockwell hardness 60 HRC for best threading performance
- ▲ VERSATILITY AND TAPERED TEETH DESIGN - Perfect to create new threads or repair damaged threads on most metals like carbon steel, cast iron, aluminum, brass, copper and stainless steel; Taps (for internal threads) and Dies (for external threads) feature with tapered teeth that start threading more easily
- ▲ MOST POPULAR SIZES - Set includes (20) Metric taps and dies: M3x0.5, M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.25, M9x1.25, M10x1.0, M10x1.5, M12x1.75; (20) SAE Fractional taps and dies for coarse thread (UNC): 4-40 NC, 6-32 NC, 8-32 NC, 10-24 NC, 12-24 NC, 1/4-20 NC, 5/16-18 NC, 3/8-16 NC, 7/16-14 NC, 1/2-13 NC; (12) SAE Fractional taps and dies for fine thread (UNF): 10-32 NF, 1/4-28 NF, 5/16-24 NF, 3/8-24 NF, 7/16-20 NF, 1/2-20 NF; (2) NPT tap and die: 1/8-27 NPT
- ▲ COMPREHENSIVE ACCESSORIES - Comes with (1) Adjustable Tap Handle; (1) T-type Small Tap Handle; (1) Adjustable Die Handle; (2) Thread Pitch Gauges; (1) Slotted Screwdriver; (1) Storage and Carry Case
Cut an external thread with a die
- Match the die to the intended thread. Check the thread specification and the rod before starting.
- Fit the die in a die holder. Use the holder to control the tool rather than turning it by hand.
- Start the die square to the rod. Keep it aligned as the first turns establish the thread.
- Use cutting fluid as recommended by the manufacturer.
A die is not a fix for every rod that is incorrectly sized or damaged. Assess the workpiece and confirm that it is appropriate for the thread you intend to cut.
Quick Recap
Rank #4
- CONTAINS -- 17 metric M3-M12 taps and 17 SAE taps, 17 metric M3-M12 dies and 17 SAE dies, 2 die wrenches, 2 tap wrenches, 2 T-handle tap wrenches, 2 screwdrivers, 1 SAE thread gauge and 1 metric thread gauge
- RETHREADING SET -- Professional standard and metric tap die rethread tool kit for cutting or updating of internal and external threads on fasteners or fastener holes. The taps can also be used to remove broken screws
- EFFICIENT AND PRECISE -- All cutting teeth are precisely CNC machined and accurately heat treated to reach hardness 60 HRC for best threading performance
- LONG-LASTING MATERIAL -- Constructed from industrial grade hardened GCr15 bearing steel for maximum strength and longevity. Suitable for cutting steel, copper, aluminum, cast iron, and other materials
- ALL-IN-ONE SET -- Comes with thread gauge, tap handle, die handle, small tap chuck, and a carrying case for your convenience. Easy to assemble and operate
Rank #3
- MAKE THE JOB MORE EFFORTLESS - compared with normal wrench, REVERSIBLE RATCHETING T HANDLES have the advantages of one-way rotation and efficient transmission, allowing users to easily control rotation direction and speed while generating greater force with less effort. toolant ratcheting wrench with 5° swing arc and has a reversing lever to eliminate hand-over-hand turning, twist lock guide system reduces the 'walk back' of the die guide and keeps the dies centered while cutting;
- SAVING CUSTOMERS' TIME in selecting the correct drill bits - toolant sae metric tap and die set is equipped with drill bits of corresponding sizes for different taps, it reduces customers' learning time, no need to repeatedly check the corresponding table,which avoids production issues due to missing or mismatched drill bits, further improving production efficiency and reducing costs;
- DECENT PORTABLE TOOL BOX - comprehensive storage container with drawers that allows you to organize accessories of different sizes in their designated compartments, making it easy to retrieve sae metric tap and die set and convenient to carry around;
- AFTER SALE WARRANTY - as a responsible company deeply committed to the tools category,we will always stand by our sae metric tap and die set, accessories are guaranteed for 180 DAYS and main tool body is guaranteed for ONE YEAR. if you experience any quality issues or accidental damage within the warranty period, please contact us for replacement parts;
- NOTES - sae metric tap and die set for general purpose use, equal to ISO3/2B tolerance grade, suitable for 6H grade nut;
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →
