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Taps for Helical Inserts
Plug Chamfer
Bottoming Chamfer
Add threads to holes in preparation for installing helical inserts. These taps are made of uncoated high-speed steel and are for use on most metal and plastic. The square shank is compatible with tap wrenches and tap holders for drill presses and milling machines.
Plug-chamfer taps are a versatile choice for most tapping applications. With 3-5 chamfered cutting threads, they require moderate torque and are often used for start-to-finish tapping of through holes and closed-end holes.When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.
Bottoming-chamfer taps cut into the workpiece with just 1-2 chamfered threads. This short chamfer lets them thread holes closer to the bottom than other taps, but they require more torque to start threads.
Inch
Drill Bit | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Insert Thread Size | Thread Lg. | Overall Lg. | Max. Tapping Dp. | Size | Decimal Size Equivalent | No. of Flutes | For Insert Thread Type | Pitch Dia. Limit | Each | |
Plug Chamfer | ||||||||||
Uncoated High-Speed Steel | ||||||||||
| 1-64 | 1/2" | 1 13/16" | 1/2" | 46 ga. | 0.081" | 3 | UNC | H1 | 000000000 | 000000 |
| 2-56 | 9/16" | 1 7/8" | 9/16" | 41 ga. | 0.096" | 3 | UNC | H1 | 000000000 | 00000 |
| 3-48 | 5/8" | 1 15/16" | 5/8" | 7/64" | 0.1094" | 3 | UNC | H1 | 000000000 | 00000 |
| 3-56 | 5/8" | 1 15/16" | 5/8" | 36 ga. | 0.1065" | 3 | UNF | H1 | 000000000 | 00000 |
| 4-40 | 11/16" | 2" | 11/16" | 31 ga. | 0.12" | 3 | UNC | H1 | 000000000 | 00000 |
| 4-48 | 11/16" | 2" | 11/16" | 31 ga. | 0.12" | 3 | UNF | H1 | 000000000 | 00000 |
| 5-40 | 3/4" | 2 1/8" | 3/4" | 29 ga. | 0.136" | 3 | UNC | H1 | 000000000 | 00000 |
| 6-32 | 7/8" | 2 3/8" | 7/8" | 25 ga. | 0.1495" | 3 | UNC | H2 | 000000000 | 00000 |
| 6-40 | 3/4" | 2 1/8" | 3/4" | 25 ga. | 0.1495" | 3 | UNF | H1 | 000000000 | 00000 |
| 8-32 | 15/16" | 2 3/8" | 15/16" | 16 ga. | 0.177" | 3 | UNC | H2 | 000000000 | 00000 |
| 8-36 | 15/16" | 2 3/8" | 15/16" | 16 ga. | 0.177" | 3 | UNF | H1 | 000000000 | 00000 |
| 10-24 | 1" | 2 1/2" | 1" | 5 ga. | 0.2055" | 3 | UNC | H2 | 000000000 | 00000 |
| 10-32 | 1" | 2 1/2" | 1" | 13/64" | 0.2031" | 3 | UNF | H2 | 000000000 | 00000 |
| 12-24 | 1 1/8" | 2 23/32" | 1 1/8" | 1 ga. | 0.228" | 3 | UNC | H2 | 000000000 | 00000 |
| 1/4"-20 | 1 1/8" | 2 23/32" | 1 1/8" | H | 0.266" | 3 | UNC | H2 | 000000000 | 00000 |
| 1/4"-28 | 1 1/8" | 2 23/32" | 1 1/8" | 6.7 mm | 0.2637" | 3 | UNF | H2 | 000000000 | 00000 |
| 5/16"-18 | 1 1/4" | 2 15/16" | 1 1/4" | Q | 0.332" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/16"-24 | 1 1/4" | 2 15/16" | 1 1/4" | 21/64" | 0.3281" | 4 | UNF | H2 | 000000000 | 00000 |
| 3/8"-16 | 1 21/32" | 3 3/8" | 1 21/32" | X | 0.397" | 4 | UNC | H3 | 000000000 | 00000 |
| 3/8"-24 | 1 7/16" | 3 5/32" | 1 7/16" | 25/64" | 0.3906" | 4 | UNF | H2 | 000000000 | 00000 |
| 7/16"-14 | 1 21/32" | 3 19/32" | 1 21/32" | 29/64" | 0.4531" | 4 | UNC | H3 | 000000000 | 00000 |
| 7/16"-20 | 1 21/32" | 3 3/8" | 1 21/32" | 29/64" | 0.4531" | 4 | UNF | H3 | 000000000 | 00000 |
| 1/2"-13 | 1 13/16" | 3 13/16" | 1 13/16" | 17/32" | 0.5313" | 4 | UNC | H3 | 000000000 | 00000 |
| 1/2"-20 | 1 21/32" | 3 19/32" | 1 21/32" | 33/64" | 0.5156" | 4 | UNF | H3 | 000000000 | 00000 |
| 9/16"-12 | 1 13/16" | 4 1/32" | 1 13/16" | 19/32" | 0.5938" | 4 | UNC | H3 | 000000000 | 00000 |
| 9/16"-18 | 1 13/16" | 3 13/16" | 1 13/16" | 37/64" | 0.5781" | 4 | UNF | H3 | 000000000 | 00000 |
| 5/8"-11 | 2" | 4 1/4" | 2" | 21/32" | 0.6563" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/8"-18 | 1 13/16" | 4 1/32" | 1 13/16" | 41/64" | 0.6406" | 4 | UNF | H3 | 000000000 | 00000 |
| 3/4"-10 | 2 7/32" | 4 11/16" | 2 7/32" | 25/32" | 0.7813" | 4 | UNC | H3 | 000000000 | 00000 |
| 3/4"-16 | 2" | 4 15/32" | 2" | 49/64" | 0.7656" | 4 | UNF | H3 | 000000000 | 00000 |
| 7/8"-9 | 2 1/2" | 5 1/16" | 2 1/2" | 29/32" | 0.9063" | 4 | UNC | H3 | 000000000 | 00000 |
| 7/8"-14 | 2 1/2" | 5 1/8" | 2 1/2" | 57/64" | 0.8906" | 4 | UNF | H3 | 000000000 | 000000 |
| 1"-8 | 2 9/16" | 5 3/4" | 2 9/16" | 1 1/32" | 1.0313" | 4 | UNC | H4 | 000000000 | 000000 |
| 1"-12 | 2 9/16" | 5 7/16" | 2 9/16" | 1 1/32" | 1.0313" | 4 | UNF | H4 | 000000000 | 000000 |
| 1"-14 | 2 9/16" | 5 7/16" | 2 9/16" | 1 1/32" | 1.0313" | 4 | UNF | H4 | 000000000 | 000000 |
| 1 1/8"-7 | 3" | 6 1/16" | 3" | 1 11/64" | 1.1719" | 4 | UNC | H4 | 000000000 | 000000 |
| 1 1/8"-12 | 2 9/16" | 5 3/4" | 2 9/16" | 1 5/32" | 1.1563" | 6 | UNF | H4 | 000000000 | 000000 |
| 1 1/4"-7 | 3" | 6 3/8" | 3" | 1 19/64" | 1.2969" | 4 | UNC | H4 | 000000000 | 000000 |
| 1 1/4"-8 | 3" | 6" | 3" | 1 1/4" | 1.25" | 4 | UN8 | H5 | 000000000 | 000000 |
| 1 1/4"-12 | 3" | 6 1/16" | 3" | 1 9/32" | 1.2813" | 6 | UNF | H4 | 000000000 | 000000 |
| 1 1/2"-6 | 3 3/16" | 7" | 3 3/16" | 1 35/64" | 1.5469" | 6 | UNC | H6 | 000000000 | 000000 |
| 1 1/2"-8 | 2" | 5" | 2" | 1 1/2" | 1.5" | 6 | UN8 | H5 | 000000000 | 000000 |
| 1 1/2"-12 | 3 3/16" | 6 11/16" | 3 3/16" | 1 17/32" | 1.5313" | 6 | UNF | H4 | 000000000 | 000000 |
| 1 3/4"-8 | 2" | 5" | 2" | 1 3/4" | 1.75" | 6 | UN8 | H5 | 000000000 | 000000 |
Bottoming Chamfer | ||||||||||
Uncoated High-Speed Steel | ||||||||||
| 2-56 | 9/16" | 1 7/8" | 9/16" | 41 ga. | 0.096" | 3 | UNC | H1 | 000000000 | 00000 |
| 3-48 | 5/8" | 1 15/16" | 5/8" | 7/64" | 0.1094" | 3 | UNC | H1 | 000000000 | 00000 |
| 3-56 | 5/8" | 1 15/16" | 5/8" | 36 ga. | 0.1065" | 3 | UNF | H1 | 000000000 | 00000 |
| 4-40 | 11/16" | 2" | 11/16" | 31 ga. | 0.12" | 3 | UNC | H1 | 000000000 | 00000 |
| 4-48 | 11/16" | 2" | 11/16" | 31 ga. | 0.12" | 3 | UNF | H1 | 000000000 | 00000 |
| 5-40 | 3/4" | 2 1/8" | 3/4" | 29 ga. | 0.136" | 3 | UNC | H1 | 000000000 | 00000 |
| 6-32 | 7/8" | 2 3/8" | 7/8" | 25 ga. | 0.1495" | 3 | UNC | H2 | 000000000 | 00000 |
| 6-40 | 3/4" | 2 1/8" | 3/4" | 25 ga. | 0.1495" | 3 | UNF | H1 | 000000000 | 00000 |
| 8-32 | 15/16" | 2 3/8" | 15/16" | 16 ga. | 0.177" | 3 | UNC | H2 | 000000000 | 00000 |
| 8-36 | 15/16" | 2 3/8" | 15/16" | 16 ga. | 0.177" | 3 | UNF | H1 | 000000000 | 00000 |
| 10-24 | 1" | 2 1/2" | 1" | 5 ga. | 0.2055" | 3 | UNC | H2 | 000000000 | 00000 |
| 10-32 | 1" | 2 1/2" | 1" | 13/64" | 0.2031" | 3 | UNF | H2 | 000000000 | 00000 |
| 12-24 | 1 1/8" | 2 23/32" | 1 1/8" | 1 ga. | 0.228" | 3 | UNC | H2 | 000000000 | 00000 |
| 1/4"-20 | 1 1/8" | 2 23/32" | 1 1/8" | H | 0.266" | 3 | UNC | H2 | 000000000 | 00000 |
| 1/4"-28 | 1 1/8" | 2 23/32" | 1 1/8" | 6.7 mm | 0.2637" | 3 | UNF | H2 | 000000000 | 00000 |
| 5/16"-18 | 1 1/4" | 2 15/16" | 1 1/4" | Q | 0.332" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/16"-24 | 1 1/4" | 2 15/16" | 1 1/4" | 21/64" | 0.3281" | 4 | UNF | H2 | 000000000 | 00000 |
| 3/8"-16 | 1 21/32" | 3 3/8" | 1 21/32" | X | 0.397" | 4 | UNC | H3 | 000000000 | 00000 |
| 3/8"-24 | 1 7/16" | 3 5/32" | 1 7/16" | 25/64" | 0.3906" | 4 | UNF | H2 | 000000000 | 00000 |
| 7/16"-14 | 1 21/32" | 3 19/32" | 1 21/32" | 29/64" | 0.4531" | 4 | UNC | H3 | 000000000 | 00000 |
| 7/16"-20 | 1 21/32" | 3 3/8" | 1 21/32" | 29/64" | 0.4531" | 4 | UNF | H3 | 000000000 | 00000 |
| 1/2"-13 | 1 13/16" | 3 13/16" | 1 13/16" | 17/32" | 0.5313" | 4 | UNC | H3 | 000000000 | 00000 |
| 1/2"-20 | 1 21/32" | 3 19/32" | 1 21/32" | 33/64" | 0.5156" | 4 | UNF | H3 | 000000000 | 00000 |
| 9/16"-12 | 1 13/16" | 4 1/32" | 1 13/16" | 19/32" | 0.5938" | 4 | UNC | H3 | 000000000 | 00000 |
| 9/16"-18 | 1 13/16" | 3 13/16" | 1 13/16" | 37/64" | 0.5781" | 4 | UNF | H3 | 000000000 | 00000 |
| 5/8"-11 | 2" | 4 1/4" | 2" | 21/32" | 0.6563" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/8"-18 | 1 13/16" | 4 1/32" | 1 13/16" | 41/64" | 0.6406" | 4 | UNF | H3 | 000000000 | 00000 |
| 3/4"-10 | 2 7/32" | 4 11/16" | 2 7/32" | 25/32" | 0.7813" | 4 | UNC | H3 | 000000000 | 00000 |
| 3/4"-16 | 2" | 4 15/32" | 2" | 49/64" | 0.7656" | 4 | UNF | H3 | 000000000 | 00000 |
| 7/8"-9 | 2 1/2" | 5 1/16" | 2 1/2" | 29/32" | 0.9063" | 4 | UNC | H3 | 000000000 | 000000 |
| 7/8"-14 | 2 1/2" | 5 1/8" | 2 1/2" | 57/64" | 0.8906" | 4 | UNF | H3 | 000000000 | 000000 |
| 1"-8 | 2 9/16" | 5 3/4" | 2 9/16" | 1 1/32" | 1.0313" | 4 | UNC | H4 | 000000000 | 000000 |
| 1"-12 | 2 9/16" | 5 7/16" | 2 9/16" | 1 1/32" | 1.0313" | 4 | UNF | H4 | 000000000 | 000000 |
| 1"-14 | 2 9/16" | 5 7/16" | 2 9/16" | 1 1/32" | 1.0313" | 4 | UNF | H4 | 000000000 | 000000 |
| 1 1/8"-7 | 3" | 6 1/16" | 3" | 1 11/64" | 1.1719" | 4 | UNC | H4 | 000000000 | 000000 |
| 1 1/8"-12 | 2 9/16" | 5 3/4" | 2 9/16" | 1 5/32" | 1.1563" | 4 | UNF | H4 | 000000000 | 000000 |
| 1 1/4"-7 | 3" | 6 3/8" | 3" | 1 19/64" | 1.2969" | 4 | UNC | H4 | 000000000 | 000000 |
| 1 1/4"-8 | 3" | 6" | 3" | 1 1/4" | 1.25" | 4 | UN8 | H5 | 000000000 | 000000 |
| 1 1/4"-12 | 3" | 6 1/16" | 3" | 1 9/32" | 1.2813" | 4 | UNF | H4 | 000000000 | 000000 |
| 1 3/8"-6 | 3 3/16" | 6 11/16" | 3 3/16" | 1 27/64" | 1.4219" | 6 | UNC | H6 | 000000000 | 000000 |
| 1 3/8"-12 | 3" | 6 3/8" | 3" | 1 25/64" | 1.3906" | 6 | UNF | H4 | 000000000 | 000000 |
| 1 1/2"-6 | 3 3/16" | 7" | 3 3/16" | 1 35/64" | 1.5469" | 6 | UNC | H6 | 000000000 | 000000 |
| 1 1/2"-8 | 2" | 5" | 2" | 1 1/2" | 1.5" | 6 | UN8 | H5 | 000000000 | 000000 |
| 1 1/2"-12 | 3 3/16" | 6 11/16" | 3 3/16" | 1 17/32" | 1.5313" | 6 | UNF | H4 | 000000000 | 000000 |
| 1 3/4"-8 | 2" | 5" | 2" | 1 3/4" | 1.75" | 6 | UN8 | H5 | 000000000 | 000000 |
Left-Hand Inch
Drill Bit | Plug Chamfer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Insert Thread Size | Thread Lg. | Overall Lg. | Max. Tapping Dp. | Size | Decimal Size Equivalent | No. of Flutes | For Insert Thread Type | Pitch Dia. Limit | Each | |
Uncoated High-Speed Steel | ||||||||||
| 1/4"-20 | 1 1/4" | 3" | 1 1/4" | H | 0.266" | 4 | UNC | H2 | 000000000 | 000000 |
| 1/4"-28 | 1 1/4" | 3" | 1 1/4" | 6.7 mm | 0.2637" | 4 | UNF | H2 | 000000000 | 00000 |
| 5/16"-18 | 1 1/2" | 3 3/8" | 1 1/2" | Q | 0.332" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/16"-24 | 1 1/2" | 3 3/8" | 1 1/2" | 21/64" | 0.3281" | 4 | UNF | H4 | 000000000 | 00000 |
| 3/8"-16 | 1 1/2" | 3 1/4" | 1 1/2" | X | 0.397" | 4 | UNC | H3 | 000000000 | 00000 |
| 3/8"-24 | 1 1/2" | 3 1/4" | 1 1/2" | 25/64" | 0.3906" | 4 | UNF | H3 | 000000000 | 00000 |
| 1/2"-13 | 1 13/16" | 3 13/16" | 1 13/16" | 17/32" | 0.5313" | 4 | UNC | H3 | 000000000 | 00000 |
| 1/2"-20 | 1 5/8" | 3 9/16" | 1 5/8" | 33/64" | 0.5156" | 4 | UNF | H5 | 000000000 | 00000 |
| 5/8"-11 | 1 13/16" | 4 1/4" | 1 13/16" | 21/32" | 0.6563" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/8"-18 | 1 13/16" | 4" | 1 13/16" | 41/64" | 0.6406" | 4 | UNF | H3 | 000000000 | 00000 |
| 3/4"-10 | 2 1/4" | 4 11/16" | 2 1/4" | 25/32" | 0.7813" | 4 | UNC | H5 | 000000000 | 00000 |
Metric
For Insert | Drill Bit | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Thread Pitch, mm | Thread Lg. | Overall Lg. | Max. Tapping Dp. | Size | Decimal Size Equivalent | No. of Flutes | Pitch Dia. Limit | Each | |
Plug Chamfer | ||||||||||
Uncoated High-Speed Steel | ||||||||||
| M2 | 0.4 | 1/2" | 1 13/16" | 1/2" | 2.1 mm | 0.0827" | 3 | H5 | 000000000 | 0000000 |
| M2.2 | 0.45 | 9/16" | 1 7/8" | 9/16" | 2.35 mm | 0.0925" | 3 | H2 | 000000000 | 00000 |
| M2.5 | 0.45 | 5/8" | 1 15/16" | 5/8" | 37 ga. | 0.104" | 3 | H2 | 000000000 | 00000 |
| M3 | 0.5 | 11/16" | 2" | 11/16" | 3.2 mm | 0.1259" | 3 | H2 | 000000000 | 00000 |
| M3.5 | 0.6 | 3/4" | 2 1/8" | 3/4" | 3.7 mm | 0.1456" | 3 | H2 | 000000000 | 00000 |
| M4 | 0.7 | 7/8" | 2 3/8" | 7/8" | 19 ga. | 0.166" | 3 | H3 | 000000000 | 00000 |
| M5 | 0.8 | 1" | 2 1/2" | 1" | 5.3 mm | 0.2086" | 3 | H3 | 000000000 | 00000 |
| M6 | 1 | 1 1/8" | 2 23/32" | 1 1/8" | 6.3 mm | 0.248" | 4 | H3 | 000000000 | 00000 |
| M7 | 1 | 1 1/4" | 2 15/16" | 1 1/4" | 7.3 mm | 0.2874" | 4 | H3 | 000000000 | 00000 |
| M8 | 1 | 1 1/4" | 2 15/16" | 1 1/4" | 8.3 mm | 0.3267" | 4 | H3 | 000000000 | 00000 |
| M8 | 1.25 | 1 1/4" | 2 15/16" | 1 1/4" | 8.4 mm | 0.3307" | 4 | H3 | 000000000 | 00000 |
| M10 | 1 | 1 7/16" | 3 3/16" | 1 7/16" | 13/32" | 0.4063" | 4 | H3 | 000000000 | 00000 |
| M10 | 1.25 | 1 21/32" | 3 3/8" | 1 21/32" | 13/32" | 0.4063" | 4 | H3 | 000000000 | 00000 |
| M10 | 1.5 | 1 21/32" | 3 3/8" | 1 21/32" | 10.5 mm | 0.4134" | 4 | H4 | 000000000 | 00000 |
| M12 | 1.25 | 1 21/32" | 3 19/32" | 1 21/32" | 31/64" | 0.4844" | 4 | H4 | 000000000 | 00000 |
| M12 | 1.5 | 1 21/32" | 3 19/32" | 1 21/32" | 12.5 mm | 0.4921" | 4 | H4 | 000000000 | 00000 |
| M12 | 1.75 | 1 21/32" | 3 19/32" | 1 21/32" | 12.5 mm | 0.4921" | 4 | H4 | 000000000 | 00000 |
| M14 | 1.5 | 1 13/16" | 3 13/16" | 1 13/16" | 37/64" | 0.5781" | 4 | H4 | 000000000 | 00000 |
| M14 | 2 | 1 13/16" | 4 1/32" | 1 13/16" | 14.5 mm | 0.5709" | 4 | H5 | 000000000 | 00000 |
| M16 | 2 | 2" | 4 1/4" | 2" | 16.5 mm | 0.6496" | 4 | H5 | 000000000 | 00000 |
| M18 | 2.5 | 2 7/32" | 4 11/16" | 2 7/32" | 47/64" | 0.7344" | 4 | H5 | 000000000 | 000000 |
| M20 | 2.5 | 2 7/32" | 4 29/32" | 2 7/32" | 13/16" | 0.8125" | 4 | H5 | 000000000 | 000000 |
| M24 | 3 | 1 1/2" | 4" | 1 1/2" | 31/32" | 0.9688" | 4 | D8 | 000000000 | 000000 |
| M30 | 3.5 | 1 1/2" | 4" | 1 1/2" | 1 7/32" | 1.2188" | 4 | D9 | 000000000 | 000000 |
| M36 | 4 | 1 1/2" | 4" | 1 1/2" | 1 15/32" | 1.4688" | 6 | D9 | 000000000 | 000000 |
Bottoming Chamfer | ||||||||||
Uncoated High-Speed Steel | ||||||||||
| M2 | 0.4 | 1/2" | 1 13/16" | 1/2" | 2.1 mm | 0.0827" | 3 | H5 | 000000000 | 000000 |
| M2.2 | 0.45 | 9/16" | 1 7/8" | 9/16" | 2.3 mm | 0.0906" | 3 | H5 | 000000000 | 00000 |
| M2.5 | 0.45 | 5/8" | 1 15/16" | 5/8" | 37 ga. | 0.104" | 3 | H2 | 000000000 | 00000 |
| M3 | 0.5 | 11/16" | 2" | 11/16" | 3.2 mm | 0.1259" | 3 | H2 | 000000000 | 00000 |
| M3.5 | 0.6 | 3/4" | 2 1/8" | 3/4" | 3.7 mm | 0.1456" | 3 | H5 | 000000000 | 000000 |
| M4 | 0.7 | 7/8" | 2 3/8" | 7/8" | 19 ga. | 0.166" | 3 | H3 | 000000000 | 00000 |
| M5 | 0.8 | 1" | 2 1/2" | 1" | 5.3 mm | 0.2086" | 3 | H3 | 000000000 | 00000 |
| M6 | 1 | 1 1/8" | 2 23/32" | 1 1/8" | 6.3 mm | 0.248" | 4 | H3 | 000000000 | 00000 |
| M7 | 1 | 1 1/4" | 2 15/16" | 1 1/4" | 7.3 mm | 0.2874" | 4 | H3 | 000000000 | 00000 |
| M8 | 1 | 1 1/4" | 2 15/16" | 1 1/4" | 8.3 mm | 0.3267" | 4 | H3 | 000000000 | 00000 |
| M8 | 1.25 | 1 1/4" | 2 15/16" | 1 1/4" | 8.4 mm | 0.3307" | 4 | H3 | 000000000 | 00000 |
| M10 | 1 | 1 7/16" | 3 3/16" | 1 7/16" | 13/32" | 0.4063" | 4 | H3 | 000000000 | 00000 |
| M10 | 1.25 | 1 21/32" | 3 3/8" | 1 21/32" | 13/32" | 0.4063" | 4 | H3 | 000000000 | 000000 |
| M10 | 1.5 | 1 21/32" | 3 3/8" | 1 21/32" | 10.5 mm | 0.4134" | 4 | H4 | 000000000 | 00000 |
| M12 | 1.25 | 1 21/32" | 3 19/32" | 1 21/32" | 31/64" | 0.4844" | 4 | H4 | 000000000 | 00000 |
| M12 | 1.5 | 1 21/32" | 3 19/32" | 1 21/32" | 12.5 mm | 0.4921" | 4 | H4 | 000000000 | 00000 |
| M12 | 1.75 | 1 21/32" | 3 19/32" | 1 21/32" | 12.5 mm | 0.4921" | 4 | H4 | 000000000 | 00000 |
| M14 | 1.5 | 1 13/16" | 3 13/16" | 1 13/16" | 37/64" | 0.5781" | 4 | H4 | 000000000 | 000000 |
| M14 | 2 | 1 13/16" | 4 1/32" | 1 13/16" | 14.5 mm | 0.5709" | 4 | H5 | 000000000 | 000000 |
| M16 | 2 | 2" | 4 1/4" | 2" | 16.5 mm | 0.6496" | 4 | H5 | 000000000 | 00000 |
| M18 | 2.5 | 2 7/32" | 4 11/16" | 2 7/32" | 47/64" | 0.7344" | 4 | H5 | 000000000 | 000000 |
| M20 | 2.5 | 2 7/32" | 4 29/32" | 2 7/32" | 13/16" | 0.8125" | 4 | H5 | 000000000 | 000000 |
| M24 | 3 | 1 1/2" | 4" | 1 1/2" | 31/32" | 0.9688" | 4 | D8 | 000000000 | 000000 |
| M30 | 3.5 | 1 1/2" | 4" | 1 1/2" | 1 7/32" | 1.2188" | 4 | D9 | 000000000 | 000000 |
| M36 | 4 | 2" | 5" | 2" | 1 15/32" | 1.4688" | 6 | D9 | 000000000 | 000000 |
Pipe Threads
For Insert | Drill Bit | Plug Chamfer | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Threads per Inch | Thread Lg. | Overall Lg. | Max. Tapping Dp. | Size | Decimal Size Equivalent | No. of Flutes | For Insert Thread Type | Each | |
Uncoated High-Speed Steel | ||||||||||
| 1/2 | 14 | 2 1/4" | 5" | 2 1/4" | 27/32" | 0.8738" | 4 | BSPP | 000000000 | 000000 |
| 1/2 | 14 | 1 3/8" | 3 1/4" | 1 3/8" | 13/16" | 0.8125" | 4 | NPT | 000000000 | 000000 |
| 3/8 | 18 | 1 3/8" | 3 1/8" | 1 3/8" | 21/32" | 0.6563" | 4 | NPT | 000000000 | 00000 |
| 3/8 | 19 | 1 7/8" | 4" | 1 7/8" | 43/64'' | 0.6719" | 4 | BSPP | 000000000 | 00000 |
| 1/4 | 18 | 1 1/16" | 2 9/16" | 1 1/16" | 33/64" | 0.5156" | 4 | NPT | 000000000 | 00000 |
| 1/4 | 19 | 1.685" | 3 1/2" | 1.685" | 17/32" | 0.5313" | 4 | BSPP | 000000000 | 00000 |
| 1/8 | 27 | 1 1/16" | 2 7/16" | 1 1/16" | W | 0.386" | 4 | NPT | 000000000 | 00000 |
| 1/8 | 28 | 1 1/2" | 3 1/8" | 1 1/2" | 25/64" | 0.3906" | 4 | BSPP | 000000000 | 00000 |
Helical Inserts with Installation Tools
Shown with Five Inserts and Drill Bit
Shown with Five Inserts
Inserts come with a through-hole tap and installation tool. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw.
Inch
| Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||
|---|---|---|---|---|---|---|---|
1/2"-20 | 3/4" | 33/64" | 33/64" | 5 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 9/16"-12 | 0.844" | 19/32" | 19/32" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 9/16"-18 | 0.844" | 37/64" | 37/64" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/8"-11 | 0.938" | 21/32" | 21/32" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/8"-18 | 0.938" | 41/64" | 41/64" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/4"-10 | 1 1/8" | 25/32" | 25/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/4"-16 | 1 1/8" | 49/64" | 49/64" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 7/8"-9 | 1.312" | 29/32" | 29/32" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 7/8"-14 | 1.312" | 57/64" | 57/64" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1"-8 | 1 1/2" | 1 1/32" | 1 1/32" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1"-12 | 1 1/2" | 1 1/64" | 1 1/64" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1"-14 | 1 1/2" | 1 1/64" | 1 1/64" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1 1/8"-7 | 1.688" | 1 5/32" | 1 5/32" | 5 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1 1/8"-12 | 1.688" | 1 5/32" | 1 5/32" | 5 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1 1/4"-7 | 1 7/8" | 1 9/32" | 1 9/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1 1/4"-12 | 1 7/8" | 1 9/32" | 1 9/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1 1/2"-6 | 2 1/4" | 1 17/32" | 1 17/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1 1/2"-12 | 2 1/4" | 1 17/32" | 1 17/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
18-8 Stainless Steel—Left-Hand Threaded | |||||||
| 1/4"-20 | 3/8" | 17/64" | 17/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 1/4"-28 | 3/8" | 17/64" | 17/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 5/16"-18 | 0.469" | 21/64" | 21/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 5/16"-24 | 0.469" | 21/64" | 21/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 3/8"-16 | 0.562" | 25/64" | 25/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 3/8"-24 | 0.562" | 25/64" | 25/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 17/32" | 17/32" | 4 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1/2"-20 | 3/4" | 33/64" | 33/64" | 4 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/8"-11 | 0.938" | 21/32" | 21/32" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/8"-18 | 0.938" | 41/64" | 41/64" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/4"-10 | 1 1/8" | 25/32" | 25/32" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
Metric
| Thread Size | Thread Pitch, mm | Thread Spacing | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| M2.5 | 0.45 | Coarse | 3.8 | No. 38 | 0.1015" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
Pipe Thread
| Pipe Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | 0.273" | 3/8" | 3/8" | 12 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
| 1/4 | 0.394" | 33/64" | 33/64" | 12 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/8 | 0.407" | 21/32" | 21/32" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1/2 | 0.534" | 13/16" | 13/16" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |