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Harvey Tool Multi-Form Thread Mills — NPT Threads
Harvey Tool Multi-Form Thread Mills — NPT Threads
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Solid-carbide multi-form thread milling cutters for NPT threads.
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Technical Specifications
Tool configurations
| Article ID | Configuration | Thread Size | Cutter Diameter D1 | Length of Cut L2 | Flutes | Shank Diameter D2 | Overall Length L1 | Included Angle (°) | Coating | Profile | Coating / flute offering | Manufacturer material recommendations | Dimensional tolerances |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 70204 | 70204 · 0.2450" · 3FL · UN | 1/16, 1/8-27 | 0.2450" | 0.4370" (7/16) | 3 | 0.2500" (1/4) | 2.5000" (2-1/2) | 60 | UN | Multi-Form | UNCOATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70204-C3 | 70204-C3 · 0.2450" · 3FL · C3 | 1/16, 1/8-27 | 0.2450" | 0.4370" (7/16) | 3 | 0.2500" (1/4) | 2.5000" (2-1/2) | 60 | C3 | Multi-Form | AlTiN COATED | Non-Ferrous Metal, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70204-C8 | 70204-C8 · 0.2450" · 3FL · C8 | 1/16, 1/8-27 | 0.2450" | 0.4370" (7/16) | 3 | 0.2500" (1/4) | 2.5000" (2-1/2) | 60 | C8 | Multi-Form | TiB2COATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70214 | 70214 · 0.3050" · 4FL · UN | 1/4, 3/8-18 | 0.3050" | 0.6250" (5/8) | 4 | 0.3125" (5/16) | 3.0000" (3) | 60 | UN | Multi-Form | UNCOATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70214-C3 | 70214-C3 · 0.3050" · 4FL · C3 | 1/4, 3/8-18 | 0.3050" | 0.6250" (5/8) | 4 | 0.3125" (5/16) | 3.0000" (3) | 60 | C3 | Multi-Form | AlTiN COATED | Non-Ferrous Metal, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70214-C8 | 70214-C8 · 0.3050" · 4FL · C8 | 1/4, 3/8-18 | 0.3050" | 0.6250" (5/8) | 4 | 0.3125" (5/16) | 3.0000" (3) | 60 | C8 | Multi-Form | TiB2COATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 790414 | 790414 · 0.3630" · 4FL · UN | 1/4, 3/8-18 | 0.3630" | 0.6800" | 4 | 0.3750" (3/8) | 3.5000" (3-1/2) | 60 | UN | Multi-Form | UNCOATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 790414-C3 | 790414-C3 · 0.3630" · 4FL · C3 | 1/4, 3/8-18 | 0.3630" | 0.6800" | 4 | 0.3750" (3/8) | 3.5000" (3-1/2) | 60 | C3 | Multi-Form | AlTiN COATED | Non-Ferrous Metal, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70226 | 70226 · 0.4950" · 4FL · UN | 1/2, 3/4-14 | 0.4950" | 0.8750" (7/8) | 4 | 0.5000" (1/2) | 3.5000" (3-1/2) | 60 | UN | Multi-Form | UNCOATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70226-C3 | 70226-C3 · 0.4950" · 4FL · C3 | 1/2, 3/4-14 | 0.4950" | 0.8750" (7/8) | 4 | 0.5000" (1/2) | 3.5000" (3-1/2) | 60 | C3 | Multi-Form | AlTiN COATED | Non-Ferrous Metal, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70232 | 70232 · 0.6200" · 4FL · UN | 1, 2-11.5 | 0.6200" | 1.1250" (1-1/8) | 4 | 0.6250" (5/8) | 4.0000" (4) | 60 | UN | Multi-Form | UNCOATED | Aluminum, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Wood, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
| 70232-C3 | 70232-C3 · 0.6200" · 4FL · C3 | 1, 2-11.5 | 0.6200" | 1.1250" (1-1/8) | 4 | 0.6250" (5/8) | 4.0000" (4) | 60 | C3 | Multi-Form | AlTiN COATED | Non-Ferrous Metal, Cast Iron, Steel, Stainless Steel, Exotic Metal, Titanium, Composites | CUTTER DIA.* · D1+.0005"-.0005" |
Technical documents
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| Description | Solid-carbide multi-form thread milling cutters for NPT threads. |
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Technical guidance & FAQs
Applications and materials
Choosing a configuration
Compatibility and use
Technical documents
What does NPT mean here?
National Pipe Taper. This family is designed for its tapered 60° thread form.
Can it cut internal and external NPT threads?
Harvey lists both, including right- and left-hand threading within the selected tool’s limits.
Which cutter diameter is listed?
Harvey labels it major cutter diameter. Use that dimension and the tool drawing when checking bore access and programming.
