Oversize Chip-Clearing Taps for Through Holes
Create oversized threads while keeping chips clear. These taps are sized for use in holes where the threads will shrink due to heat treatment or plating. Also known as gun taps, they have spiral-point flutes to push chips ahead of the tap and out of through holes. Because they don't need to be reversed to prevent buildup, they produce threads more efficiently than standard taps and are suitable for production work.
They're made of high-speed steel and are for use on most metal and plastic. With a square shank, they're compatible with tap wrenches and tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.
For technical drawings and 3-D models, click on a part number.
Thread | Drill Bit | Plug Chamfer | |||||||
|---|---|---|---|---|---|---|---|---|---|
Size | Lg. | Overall Lg. | Size | Decimal Size Equivalent | No. of Flutes | Thread Type | Pitch Dia. Limit | Each | |
Uncoated High-Speed Steel | |||||||||
| 4-40 | 9/16" | 1 7/8" | 43 ga. | 0.089" | 2 | UNC | H11 | 0000000 | 000000 |
| 6-32 | 11/16" | 2" | 36 ga. | 0.1065" | 2 | UNC | H11 | 0000000 | 00000 |
| 8-32 | 3/4" | 2 1/8" | 29 ga. | 0.136" | 2 | UNC | H11 | 0000000 | 00000 |
| 10-24 | 7/8" | 2 3/8" | 25 ga. | 0.1495" | 2 | UNC | H11 | 0000000 | 00000 |
| 10-32 | 7/8" | 2 3/8" | 21 ga. | 0.159" | 2 | UNF | H11 | 0000000 | 00000 |
| 1/4"-20 | 1" | 2 1/2" | 7 ga. | 0.201" | 2 | UNC | H11 | 0000000 | 00000 |
| 1/4"-28 | 1" | 2 1/2" | 3 ga. | 0.213" | 2 | UNF | H11 | 0000000 | 00000 |
| 5/16"-18 | 1 1/8" | 2 23/32" | F | 0.257" | 3 | UNC | H11 | 0000000 | 00000 |
| 5/16"-24 | 1 1/8" | 2 23/32" | I | 0.272" | 3 | UNF | H11 | 0000000 | 00000 |
| 3/8"-16 | 1 1/4" | 2 15/16" | 5/16" | 0.3125" | 3 | UNC | H11 | 0000000 | 00000 |
| 3/8"-24 | 1 1/4" | 2 15/16" | Q | 0.332" | 3 | UNF | H11 | 0000000 | 00000 |
| 1/2"-13 | 1 21/32" | 3 3/8" | 27/64" | 0.4219" | 3 | UNC | H11 | 0000000 | 00000 |
| 1/2"-20 | 1 21/32" | 3 3/8" | 29/64" | 0.4531" | 3 | UNF | H11 | 0000000 | 00000 |
| 5/8"-11 | 1 13/16" | 3 13/16" | 17/32" | 0.5313" | 3 | UNC | H11 | 0000000 | 00000 |
| 3/4"-10 | 2" | 4 1/4" | 21/32" | 0.6563" | 3 | UNC | H11 | 0000000 | 00000 |
Thread | Drill Bit | Plug Chamfer | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Lg. | Overall Lg. | Size | Decimal Size Equivalent | No. of Flutes | Thread Type | Pitch Dia. Limit | Each | |
Uncoated High-Speed Steel | ||||||||||
| M3 | 0.5 | 11/16" | 1 15/16" | 2.5 mm | 0.0984" | 2 | Metric | H11 | 00000000 | 000000 |
| M3.5 | 0.6 | 11/16" | 2" | 2.9 mm | 0.1142" | 2 | Metric | H11 | 00000000 | 00000 |
| M4 | 0.7 | 3/4" | 2 1/8" | 3.3 mm | 0.1299" | 2 | Metric | H11 | 00000000 | 00000 |
| M5 | 0.8 | 7/8" | 2 3/8" | 4.2 mm | 0.1653" | 2 | Metric | H11 | 00000000 | 00000 |
| M6 | 1 | 1" | 2 1/2" | 5 mm | 0.1968" | 2 | Metric | H11 | 00000000 | 00000 |
| M8 | 1.25 | 1 1/8" | 2 23/32" | 6.75 mm | 0.2657" | 2 | Metric | H11 | 00000000 | 00000 |
| M10 | 1.5 | 1 1/4" | 2 15/16" | 8.5 mm | 0.3346" | 3 | Metric | H11 | 00000000 | 00000 |
| M12 | 1.75 | 1 21/32" | 3 3/8" | 10.25 mm | 0.4035" | 3 | Metric | H11 | 00000000 | 00000 |
Oversize General Purpose Taps
Sized to cut oversized threads, these tools are often used to tap holes where the threads will shrink due to heat treatment or plating. They're made of high-speed steel and are for use on most metal and plastic. With a square shank, they're compatible with tap wrenches and tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.
For technical drawings and 3-D models, click on a part number.
Thread | Drill Bit | Plug Chamfer | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Lg. | Overall Lg. | Size | Decimal Size Equivalent | No. of Flutes | Thread Type | Pitch Dia. Limit | Each | |
Uncoated High-Speed Steel | |||||||||
| 6-32 | 11/16" | 2" | 36 ga. | 0.1065" | 3 | UNC | H11 | 0000000 | 00000 |
| 8-32 | 3/4" | 2 1/8" | 29 ga. | 0.136" | 3 | UNC | H11 | 0000000 | 0000 |
| 10-24 | 7/8" | 2 3/8" | 25 ga. | 0.1495" | 3 | UNC | H11 | 0000000 | 0000 |
| 10-32 | 7/8" | 2 3/8" | 21 ga. | 0.159" | 3 | UNF | H11 | 0000000 | 0000 |
| 1/4"-20 | 1" | 2 1/2" | 7 ga. | 0.201" | 4 | UNC | H11 | 0000000 | 00000 |
| 1/4"-28 | 1" | 2 1/2" | 3 ga. | 0.213" | 4 | UNF | H11 | 0000000 | 00000 |
| 5/16"-18 | 1 1/8" | 2 23/32" | F | 0.257" | 4 | UNC | H11 | 0000000 | 00000 |
| 5/16"-24 | 1 1/8" | 2 23/32" | I | 0.272" | 4 | UNF | H11 | 0000000 | 00000 |
| 3/8"-16 | 1 1/4" | 2 15/16" | 5/16" | 0.3125" | 4 | UNC | H11 | 0000000 | 00000 |
| 3/8"-24 | 1 1/4" | 2 15/16" | Q | 0.332" | 4 | UNF | H11 | 0000000 | 00000 |
| 7/16"-14 | 1 7/16" | 3 5/32" | U | 0.368" | 4 | UNC | H11 | 0000000 | 00000 |
| 7/16"-20 | 1 7/16" | 3 5/32" | 25/64" | 0.3906" | 4 | UNF | H11 | 0000000 | 00000 |
| 1/2"-13 | 1 21/32" | 3 3/8" | 27/64" | 0.4219" | 4 | UNC | H11 | 0000000 | 00000 |
| 1/2"-20 | 1 21/32" | 3 3/8" | 29/64" | 0.4531" | 4 | UNF | H11 | 0000000 | 00000 |
| 5/8"-11 | 1 13/16" | 3 13/16" | 17/32" | 0.5313" | 4 | UNC | H11 | 0000000 | 00000 |
Thread | Drill Bit | Plug Chamfer | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Lg. | Overall Lg. | Size | Decimal Size Equivalent | No. of Flutes | Thread Type | Pitch Dia. Limit | Each | |
Uncoated High-Speed Steel | ||||||||||
| M3 | 0.5 | 5/8" | 1 15/16" | 2.5 mm | 0.098" | 3 | Metric | H11 | 00000000 | 000000 |
| M3.5 | 0.6 | 11/16" | 2" | 2.9 mm | 0.114" | 3 | Metric | H11 | 00000000 | 00000 |
| M4 | 0.7 | 3/4" | 2 1/8" | 3.3 mm | 0.13" | 4 | Metric | H11 | 00000000 | 00000 |
| M5 | 0.8 | 7/8" | 2 3/8" | 4.2 mm | 0.165" | 4 | Metric | H11 | 00000000 | 00000 |
| M6 | 1 | 1" | 2 1/2" | 5.0 mm | 0.197" | 4 | Metric | H11 | 00000000 | 00000 |
| M8 | 1.25 | 1 1/8" | 2 23/32" | 6.75 mm | 0.266" | 4 | Metric | H11 | 00000000 | 00000 |
| M10 | 1.5 | 1 1/4" | 2 15/16" | 8.5 mm | 0.335" | 4 | Metric | H11 | 00000000 | 00000 |
| M12 | 1.75 | 1 21/32" | 3 3/8" | 10.25 mm | 0.404" | 4 | Metric | H11 | 00000000 | 00000 |