18 Types of Thread Taps: A Guide to Choosing the Right One?

Tapping a thread seems simple until you break a tap, create a rough thread, or get inconsistent fits. With so many tap types and standards to choose from, selecting the right one for your workpiece can be overwhelming.

There are 18 main types of thread taps, each with unique design features and applications. The right tap ensures precise thread formation, reduces breakage risk, and improves productivity, especially when matched to material and thread requirements.

When you understand thread taps—their structures, materials, coatings, and typical uses—choosing the right one becomes a science, not a guessing game. I’ve learned the hard way that a mismatched tap leads to frustrating breakages and wasted material. Let’s break down every tap type so you can make confident, cost-effective choices.

What Is a Thread Tap and What Are Its Main Components?

Thread taps are essential for creating internal threads[^1], allowing fasteners to be securely inserted into pre-drilled holes.

A thread tap is a precision-cutting tool with features—body, shank, flutes, threads, and point—targeted for producing female threads in a wide range of materials, from mild steel to titanium.

Main Components of a Thread Tap

Part	Função
Body	Central, threaded section which cuts the thread
Shank	Gripped by the tap wrench or machine tool
Flautas	Grooves that clear chips and aid cooling during cutting
Threads	The actual cutting or forming profiles on the tap
Point	Tapered end to help guide entry into the hole

Knowing each part helps you select taps with the best chip evacuation, cutting aggressiveness, and fit for machine or hand use.

What Are the 18 Types of Thread Taps and Their Applications?

Selecting the correct tap directly impacts threading quality, tool life, and process speed.

From basic hand taps to spiral flutes, from gas taps to advanced carbide models—each tap type serves a special function. Some work best in blind holes, others excel with tough alloys or production runs.

The 18 Types Explained

#	Tap Type	Key Features & Typical Use
1	Hand Tap	Straight flutes, general use by hand or low-speed machines
2	Taper Tap	Long chamfer, easy starting, ideal for new threads
3	Plug Tap	Medium chamfer, most common, general-purpose, finishes most threads
4	Bottoming Tap	Short chamfer, cuts full thread to hole bottom, for finishing
5	Master Tap	Multi-flute, highly accurate, for rigid materials and precise threads
6	Gas Tap	Short chamfer for pipe/gas fit threads; specialized thread forms
7	Machine Screw Tap	Engineered for CNC/machine tapping, may be coated/special material
8	Extension Tap	Long shank for hard-to-reach/deep holes
9	Bend Shank Tap	Bent body for restricted access, moderate strength
10	Stay Bolt Tap	Extra long, for industrial applications (like boiler plates)
11	Spiral Point Tap	"Gun tap"—pushes chips forward, perfect for through holes
12	Spiral Fluted Tap	Spiral flutes pull chips out, best for blind holes/materials with long chips
13	Thread-Forming Tap	Forms (not cuts) threads, no chips—best for ductile materials
14	Pulley Tap	Extended length for tapping pulley hubs and recesses
15	Pipe Tap	Tappered for NPT/BSP threads on pipes and fittings
16	Combined Drill & Tap	Drills and taps in one pass, saves time on through/thin materials
17	Solid Carbide Tap	Ultra-hard, for tough or abrasive materials, CNC only
18	Interrupted Thread Tap	Gaps in teeth for chip flow and lower torque in tough or deep holes

It’s essential to match tap style to material: spiral point and spiral flute work differently (push vs. pull chips), forming taps need ductile metals, and carbide taps require rigid setups.

Pro Table — Hand Tap Set Example

Tap Part	Taper Tap	Plug Tap	Bottoming Tap
Chamfer Length	7–10	4–6	1–2
Starting Use	Best	Good	Not for Starts
Thread Finish	Partial	Most	Full-depth
Inscrição	Begin	General	Blind Hole

How Do You Drill and Tap a Hole Correctly?

If you want to avoid broken taps and rough threads, process control matters.

Drill with the right size, chamfer the edge, select a fitting tap, lubricate well, and align the tool. For machine tapping, use a tap guide and proper parameters; for manual, go slow and back out regularly.

Step-by-Step Tapping

1. Select proper tap and corresponding drill size (check a tap drill chart[^2]).
2. Drill hole—go deep enough for the full thread and chamfer the entrance.
3. Secure workpiece and apply cutting fluid[^3].
4. Start tapping using a guide; for hand taps, turn forward, then back a quarter turn to break chips.
5. For machine tapping (drill press/CNC), use the recommended speed and tool extension.
6. Back out tap, clean threads, and check fit.

Pro Tip: For blind holes, use a spiral flute tap; for through-holes, use a spiral point or gun tap.

What Are the Most Common Thread Tap Problems and How Do You Solve Them?

Tapping is a delicate process. When something goes wrong, the result is wasted time and damaged parts. Let’s address the six most common issues:

Typical problems include tap breakage, chipping, excessive wear, wrong pitch diameter, poor surface roughness, and thread misfit. Prevention depends on material prep, tap choice, lubrication, chip control, correct alignment, and careful speed control.

Troubleshooting Chart

Problem	Causes	Solutions
Tap breaks	Hole too small, chip jam, too fast, misaligned	Correct hole size, better tap, slow speed, alignment
Teeth chip/break	Oversized rake angle, high hardness, worn tap	Adjust angles, reduce hardness, timely replacement
Wears out fast	High speed, wrong parameter, bad fluid, burns	Slower speed, right fluid, sharpen, treat parts
Thread pitch too large	Wrong tap grade, poor coaxiality, fast speed	Use tolerance tap, lower speed, check alignment
Thread pitch too small	Wrong accuracy level, old tap, poor lubricant	Suit tap to tolerance, replace, improve lubrication
Too rough surface	Low hardness, poor finish, fast speed, dull tap	Increase hardness, slow down, better fluid, replace

Always plan in advance: check your work material, hole style (through or blind), and confirm tap/tool condition before starting.

How Do You Select the Best Tap for Your Project?

Tap selection is part science, part experience. Get it wrong and you risk product defects or constant tool changes.

Consider the workpiece material, thread type, depth, production volume, machine or hand method, and tap tolerance (fit). For tricky or tough jobs, use high-performance taps or those with special coatings.

Key Selection Criteria

Factor	Choice Example
Material	Steel (HSS, HSS-E); Aluminum (spiral flute, thread-forming)
Hole Type	Through (gun/spiral point); Blind (spiral flute); Pipe (tapered tap)
Thread Fit	General (2B/6H); Precision (3B, PM, Carbide)
Volume	High (master, machine, coated); Low (carbon, hand tap)
Tapping Style	Machine (rigid, carbide); Hand (straight flute set)

Selecting a tap with a TiN, TiAlN, or TiCN coating often pays off for stainless steel or high-volume jobs. Always check tap and thread markings before use.

What Materials Are Thread Taps Made From and Why Does It Matter?

Tap life depends on material quality. Cheap taps wear or break faster, costing you more in the long run.

HSS and cobalt—best for most steels; carbide—essential for hard, abrasive, or tough alloys. Powder metallurgy and coatings (TiN, TiAlN) boost performance for difficult materials and high-speed CNC work.

Material	Best For	Notes
HSS	Mild steel, brass, general use	Versatile, affordable
HSS-E (Cobalt)[^4]	Hard steels, stainless, cast iron	Tougher, higher cutting temperature
Carboneto	Hardened or abrasive alloys, CNC	Brittle, expensive, long life
PM-HSS	High-performance in tough/demanding cases	Wear resistant, high-speed jobs
Aço carbono	Wood, plastics, non-ferrous	Low cost, not for metals
Coated (TiN etc)	Stainless, high-production, alloy steels	Reduce wear/friction, prolong life

What Do the Markings on a Thread Tap Mean?

Tap markings provide all the critical data needed for proper selection and application.

Typical tap markings include size/pitch, material, chamfer style, tolerance, and special features. Don’t use a tap without knowing exactly what’s marked on it.

Marcação	Significado
M6 × 1.0, ¼"-20 UNC	Size, metric or imperial, thread pitch/type
HSS, HSS-E, Carbide	Material
T/P/B or 1st/2nd/3rd	Chamfer style: Taper, Plug, Bottoming
6H, 2B, 3B	Tolerance/fit (metric/imperial)
LH, FORM, PIPE, NPT	Left hand, forming tap, pipe/standard

How to Avoid Tap Breakage and Tapping Problems?

Broken taps are frustrating and expensive. Luckily, prevention is always possible.

To avoid breakage, match tap and hole size, use quality lubricants, keep correct alignment, operate at safe cutting speeds, clear chips often, and replace taps when worn.

• Check tap type for material and hole style, drill hole to correct size.
• Align workpiece and tap to stop side force or cross-threading[^5].
• Use fluid for cooling (especially on hard metals).
• Go slow—especially when nearly at full depth, and reverse to break chips.
• Regularly inspect tap wear, replace when cutting performance drops.
  

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