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Types of Taps
Types of taps are essential cutting tools used to create internal threads in machining operations. These tools are categorized by cutting method (such as cutting taps for material removal or forming taps for deformation), flute design (including spiral flute for blind holes and spiral point for through holes), and thread type (metric, UN, or pipe threads). Specialized variants like interrupted thread taps reduce friction in tough materials, while combination taps integrate drilling and threading. Selecting the right tap—based on material, thread standard, and application—ensures precision and efficiency in industries ranging from automotive to aerospace.
Types of Taps |
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Classification Basis |
Tap Type |
Structural Features |
Applications |
Thread Standards |
Material/Coatings |
| By Cutting Method | Cutting Tap | Forms threads by removing material with cutting edges | Through/blind holes (requires chip flutes) | ISO/ANSI/UN | HSS, Cobalt Steel, Coated Carbide |
| Forming Tap | Creates threads through material deformation (no cutting edges) | Ductile materials (Al/Cu/low-carbon steel) | Metric/UNC | PM-HSS, TiN Coating | |
| By Flute Design | Straight Flute Tap | Simple linear flutes for chip evacuation | Short-chip materials (cast iron/brass) | BSW, NPT | HSS |
| Spiral Flute Tap | Helical flutes for upward chip removal | Blind holes (steel/stainless steel) | DIN, JIS | Cobalt Steel, TiAlN Coating | |
| Spiral Point Tap | Spiral cutting edges for downward chip ejection | High-efficiency through-hole threading | ISO Metric | Carbide | |
| By Thread Type | Metric Tap | 60° thread angle (ISO standard) | Metric threads (M3-M100) | ISO 68-1 | Various materials |
| UN/UNC Tap | 60° thread angle (Coarse UNC/Fine UNF) | American fasteners | ANSI B1.1 | HSS, Coatings | |
| Pipe Tap | 55° thread angle with taper (NPT/NPTF) | Hydraulic/pneumatic sealing | ASME B1.20.1 | Corrosion-resistant steel | |
| Special Purpose | Interrupted Thread Tap | Alternating teeth reduce friction | Gummy materials (titanium/stainless) | Custom | Carbide + Diamond Coating |
| Combination Tap | Integrated drill & thread forming | Sheet metal/automated production | Custom | Solid Carbide | |
| Trapezoidal Tap | 30掳 thread angle for power transmission | CNC lead screws | DIN 103 | Tool Steel | |
| By Accuracy Class | Class 1 | Loose tolerance for quick threading | Low-requirement fasteners | National standards | Economy HSS |
| Class 2 | Standard tolerance (most common) | General mechanical fastening | ISO/ANSI | Coated HSS | |
| Class 3 | Tight tolerance for precision fit | Aerospace/precision instruments | MIL-SPEC | Ultra-fine Grain Carbide | |
Key Notes:
Forming taps offer longer tool life than cutting taps but require material ductility >10%.
Spiral flute taps require prompt chip removal in blind holes to avoid clogging.
Coating selection:
- TiN (Titanium Nitride): General purpose.
- TiCN (Titanium Carbonitride): Higher hardness.
- TiAlN (Titanium Aluminum Nitride): Heat-resistant (for stainless/heat-resistant alloys).
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