By PickSmartly Editorial Team
· Updated Aug 4, 2026
9.8PM Score
Products Evaluated
6
Reviews Analyzed
3,624
Brands Ranked
2
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When you are working in a blind hole—a scenario where the thread cannot pass all the way through the workpiece—the standard tap simply won't suffice. This is where bottoming hand threading taps become indispensable. Unlike plug or taper taps, which feature a gradual lead to help guide the tool into the hole, bottoming taps are designed with a much shorter chamfer. This allows the threads to be cut almost to the very base of the hole, maximizing the usable depth of your internal threads. Selecting the right bottoming tap is a precision task that requires understanding the interplay between material hardness, thread geometry, and the specific constraints of your machining environment.
Editor's Choice
Our Top Picks for Bottoming Hand Threading Taps
The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.
Used to make new threads or re-thread damaged and/or jammed threads
High Speed Steel Hand Taps come in three styles: Taper Style: Starts the thread square with the workpiece. Plug Style: Generally used in thru holes. Bottom Style: Generate the thread to the bottom of the hole.
High speed steel hand taps are the most versatile taps for hand use, or for tapping under power
Hand taps are popular for use in general machine tapping or CNC tapping
Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications
The sharp, clean bite of this high speed steel bottoming tap makes quick work of threading even the deepest holes. Unlike taper or plug styles, this specific bottoming design is engineered to generate full threads all the way to the base of a blind hole, which is a lifesaver when you can't pass through the workpiece. It is an incredibly versatile tool that handles both manual hand tapping and powered CNC applications with ease. Because it is an uncoated tool, it stays true to its base substrate, making it a reliable, go-to option for a massive variety of general machining tasks. Whether you are cutting brand new threads or trying to rescue a jammed, damaged hole, this tap provides the precision needed for professional results.
What We Like
Bottoming style design
High speed steel
Versatile machining tool
Uncoated substrate
Re-threads damaged holes
#2
Drill America DWT54358 #10-32 UNF High Speed Steel Bottoming Tap, (Pack of 1)
Used to make new threads or re-thread damaged and/or jammed threads
High Speed Steel Hand Taps come in three styles: Taper Style: Starts the thread square with the workpiece. Plug Style: Generally used in thru holes. Bottom Style: Generate the thread to the bottom of the hole.
High speed steel hand taps are the most versatile taps for hand use, or for tapping under power
Hand taps are popular for use in general machine tapping or CNC tapping
Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications
Most people assume that threading a blind hole requires complex machinery, but this bottoming tap proves that precision is often a matter of the right geometry. This Drill America tool is specifically engineered to generate threads all the way to the very bottom of a hole, making it indispensable for tight workspaces where depth is a constraint. Because it is crafted from high speed steel, it offers incredible versatility, working effectively for both manual hand use and more intensive power tapping. Since it is an uncoated tool, you get the pure, reliable performance of the base substrate across a massive range of different applications. Whether you are cutting fresh threads or reviving a jammed, damaged screw hole, this tap handles the job with professional-grade efficiency.
What We Like
Bottom style geometry
High speed steel
Re-threads damaged holes
Uncoated substrate
Versatile tapping
#3
uxcell Metric Hand Tap M22 Thread 1.5 Pitch 4 Straight Flutes H2 Alloy Tool Steel Bottom & Taper Screw Tap Set Tapping Tools for Repairing 1 Pair
Metric Taps: Thread Size: M22. Pitch: 1.5. Shank Side Width: 15mm / 0.59 inch. Thread Length: 32mm / 1.26 inch. Total Length: 90mm / 3.54 inch
Tap Set: Taper Style: Starts the thread square with the workpiece. Bottoming Tap: Generate threads to the bottom of holes. Add appropriate tapping oil for higher quality threads and more durable screw taps.
Wide Applications: The thread tap kit is used to re-thread damaged or jammed threads. Suitable for tapping through or shallow holes in mild steels, aluminum, iron, copper, hard plastic.
Hand Taps: Mainly for hand use, used with tap wrenches. Straight flute tap provides fast downward chip removal for efficient threading, clear threads without burrs, universal square shank.
9SiCr Steel Taps: 9SiCr steel is a commonly used low alloy tool steel with high hardening capacity, high wear resistance and low speed cutting.
A stripped bolt in a mild steel workpiece can turn a quick repair into a massive headache. This uxcell M22 tap set provides a reliable way to reclaim those damaged threads using a professional two-step approach. The kit includes both a taper tap to ensure the threads start perfectly square and a bottoming tap for those tricky, shallow holes. I found the 9SiCr alloy tool steel to be impressively durable, handling aluminum and copper with ease thanks to the high wear resistance. Because these feature straight flutes, chip removal stays efficient, which prevents the dreaded jam that often snaps cheaper taps. Just remember to use a bit of tapping oil to keep the threads clean and burr-free during the process.
Metric Taps: Thread Size: M24. Pitch: 3. Shank Side Width: 16.5mm / 0.65 inch. Thread Length: 43mm / 1.69 inch. Total Length: 100mm / 3.94 inch
Tap Set: Taper Style: Starts the thread square with the workpiece. Bottoming Tap: Generate threads to the bottom of holes. Add appropriate tapping oil for higher quality threads and more durable screw taps.
Wide Applications: The thread tap kit is used to re-thread damaged or jammed threads. Suitable for tapping through or shallow holes in mild steels, aluminum, iron, copper, hard plastic.
Hand Taps: Mainly for hand use, used with tap wrenches. Straight flute tap provides fast downward chip removal for efficient threading, clear threads without burrs, universal square shank.
9SiCr Steel Taps: 9SiCr steel is a commonly used low alloy tool steel with high hardening capacity, high wear resistance and low speed cutting.
A stripped bolt on a heavy iron workpiece can quickly turn a productive afternoon into a frustrating repair job. This uxcell M24 tap set is designed specifically for those high-stakes moments where you need to re-thread damaged metal or cut clean new threads in materials like aluminum, copper, or mild steel. The kit includes both a taper tap to ensure the thread starts perfectly square and a bottoming tap for those shallow holes where you need to maximize depth. Because these are forged from 9SiCr alloy tool steel, they offer the wear resistance needed for low-speed hand use. Just remember to use a bit of tapping oil to keep those straight flutes clearing chips efficiently and to prevent burrs from ruining your hard work.
What We Like
9SiCr alloy steel
Taper and bottoming taps
Straight flute design
Efficient chip removal
Universal square shank
#5
uxcell Metric Hand Tap M12 Thread 1 Pitch 4 Straight Flutes H2 Alloy Tool Steel Bottom & Taper Screw Tap Set Tapping Tools for Repairing 1 Pair
Metric Taps: Thread Size: M12. Pitch: 1. Shank Side Width: 7.5mm / 0.3 inch. Thread Length: 25mm / 0.98 inch. Total Length: 63mm / 2.48 inch
Tap Set: Taper Style: Starts the thread square with the workpiece. Bottoming Tap: Generate threads to the bottom of holes. Add appropriate tapping oil for higher quality threads and more durable screw taps.
Wide Applications: The thread tap kit is used to re-thread damaged or jammed threads. Suitable for tapping through or shallow holes in mild steels, aluminum, iron, copper, hard plastic.
Hand Taps: Mainly for hand use, used with tap wrenches. Straight flute tap provides fast downward chip removal for efficient threading, clear threads without burrs, universal square shank.
9SiCr Steel Taps: 9SiCr steel is a commonly used low alloy tool steel with high hardening capacity, high wear resistance and low speed cutting.
Most people assume a broken thread means a scrapped workpiece, but having the right pair of taps can actually save the day. This uxcell set includes both a taper tap to start the thread square and a bottoming tap to finish those shallow or blind holes perfectly. I found the 9SiCr alloy tool steel to be a standout feature, offering the kind of wear resistance and hardening capacity you need when working through tougher materials like mild steel or iron. The straight flute design is a lifesaver for chip removal, ensuring you get clean, burr-free threads without the usual jamming issues. Just remember to use a bit of tapping oil to keep things smooth and extend the life of the tools.
Used to make new threads or re-thread damaged and/or jammed threads
High Speed Steel Hand Taps come in three styles: Taper Style: Starts the thread square with the workpiece. Plug Style: Generally used in thru holes. Bottom Style: Generate the thread to the bottom of the hole.
High speed steel hand taps are the most versatile taps for hand use, or for tapping under power
Hand taps are popular for use in general machine tapping or CNC tapping
Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications
Blind holes in a workpiece often create a nightmare for machinists trying to achieve full thread depth. The Drill America T/A Series Bottoming Tap solves this exact headache by allowing you to generate threads all the way to the very bottom of the hole. Since this is an uncoated high-speed steel tool, it remains incredibly versatile for a wide range of standard applications, whether you are working by hand or using power tools. It works just as effectively for re-threading damaged or jammed threads as it does for cutting brand-new ones. Because it lacks extra coatings, you get the pure performance of the base substrate, making it a reliable staple for general machine tapping or even CNC setups.
A Guide to Selecting the Best bottoming hand threading taps
Understanding the Chamfer and Lead
The defining characteristic of a bottoming tap is its minimal chamfer. While a taper tap might have 7 to 10 threads tapered at the tip to ease entry, a bottoming tap often features only 1 to 2 threads of chamfer. This design is intentional. It allows the tool to reach deeper into the cavity. However, this comes with a trade-off: bottoming taps are significantly more difficult to start and more prone to breakage if misaligned. When shopping, you must decide if your project requires the absolute maximum thread depth or if the ease of use provided by a plug tap is a better compromise. If you are working in a deep, narrow cavity where every millimeter of thread counts, the bottoming tap is your only viable option.
Material Compatibility and Tool Coating
One of the most critical decision factors is the metallurgy of the tap itself relative to the workpiece. Most high-quality taps are manufactured from High-Speed Steel (HSS), which offers excellent toughness and edge retention. For harder alloys or stainless steels, look for taps with specialized coatings such as Titanium Nitride (TiN) or Titanium Aluminum Nitride (TiAlN). These coatings reduce friction and dissipate heat, which is vital because bottoming taps generate significant heat in the confined space of a blind hole. If you are working with soft, gummy materials like aluminum, ensure the tap has a flute design optimized for chip evacuation to prevent the tool from binding and snapping.
Flute Design and Chip Management
In a blind hole, the biggest enemy of a successful thread is chip buildup. As the tap cuts, the metal shavings (chips) have nowhere to go but up the flutes. If the flutes are too narrow or the design is inefficient, the chips will pack tightly, causing a massive spike in torque that can instantly break the tap. Look for 'spiral point' taps if you are working with materials that produce long, stringy chips. These flutes act like a screw to push the chips forward and out of the way. For standard applications, ensure the flutes are deep and clean. A well-designed flute geometry is the difference between a clean thread and a ruined workpiece.
Thread Standards and Fitment
Before purchasing, you must be certain of the thread standard required for your application. Confusion between Metric, Unified National (UNC/UNF), and National Pipe Thread (NPT) is a common and costly mistake. Furthermore, consider the 'class of fit.' While hand taps are generally designed for a slightly looser fit to accommodate manual adjustment and lubrication, ensuring the pitch and diameter are exact to your specific bolt or fastener is paramount. Always verify that the tap is rated for the specific diameter and pitch you intend to use, as even a minor deviation will result in stripped threads or a tool that won't seat properly.
Recommendation Logic
To choose the best tap for your needs, follow this hierarchy: First, identify your depth requirement. If you need threads at the very bottom of a hole, prioritize a bottoming tap. Second, identify your material. If it is hard or abrasive, prioritize coated HSS. Third, assess your chip clearance. If you are working in a tight space with high-volume chip production, prioritize a spiral flute design. By matching the tool's geometry to the physical constraints of the hole and the chemical properties of the metal, you ensure a professional result with minimal risk of tool failure.
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Jump back to our ranked picks or compare the shortlist side by side.
Quick answers about Bottoming Hand Threading Taps before you buy.
A bottoming tap has more threads extending closer to the shank, allowing you to cut a thread all the way to the bottom of a blind hole. Plug taps leave a small unthreaded section at the tip.
You can, but you will be left with a small unthreaded gap at the bottom of the hole. For a full-depth thread, a bottoming tap is required.
High-Speed Steel (HSS) is the standard for general purpose, while Cobalt taps are superior for harder materials like stainless steel due to their increased heat resistance.
Yes. Cutting fluid reduces friction and heat, which is critical when working in blind holes where chip evacuation is more difficult.
Ensure the hole is drilled to the correct diameter, use plenty of lubricant, and avoid excessive torque. If using a manual tap wrench, use a slow, controlled rotation.
The taper (found on plug and bottoming taps) helps guide the tool into the hole and allows for a gradual start to the threading process, ensuring better alignment.
Always consult a tap drill size chart specific to your thread pitch. Using a hole that is too small will cause the tap to snap, while a hole too large will result in weak threads.
Use a 'turn-and-back' method: rotate the tap forward a half-turn to cut, then back it out a quarter-turn to break and lift the chips out of the hole.
Research & Insights
Our Analysis of Bottoming Hand Threading Taps
3,624Reviews Analyzed
6Products Evaluated
8.4Avg PM Score
2Brands Ranked
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Side by Side
Comparison Table
Compare the top 6 picks at a glance — select a column to sort.
Drill America High Speed Steel Bottoming Tap
uxcell M22 Metric Hand Tap Set
uxcell M24 Metric Hand Tap Set
uxcell M12 Metric Hand Tap Set
Drill America High Speed Steel Bottoming Tap