About Counterbores
Counterboring—Enlarge the top of an existing hole to create a cylindrical-shaped opening with a flat bottom that acts as a seat for the head of a screw or wood plug.
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About Drill Bits
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Drill Bit Decimal Size Equivalents
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Short-Length Cobalt Steel Drill Bits
Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits. Made of cobalt steel, which has better heat and wear resistance than high-speed steel, they can run up to 25% faster and have a longer tool life.
Titanium-nitride (TiN) coated drill bits last longer and can drill at higher speeds than uncoated drill bits.
Drill bits with a split point keep centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | Each | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Wire Gauge | |||||||||
Titanium-Nitride (TiN) Coated Cobalt Steel | |||||||||
| 41 ga. | 0.096" | 1 13/16" | 0.38" | Round | 0.096" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 00000 |
| 40 ga. | 0.098" | 1 13/16" | 0.39" | Round | 0.098" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
| 39 ga. | 0.0995" | 1 13/16" | 0.39" | Round | 0.0995" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
| 38 ga. | 0.1015" | 1 13/16" | 0.4" | Round | 0.1015" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
| 37 ga. | 0.104" | 1 13/16" | 0.41" | Round | 0.104" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
| 36 ga. | 0.1065" | 1 13/16" | 0.42" | Round | 0.1065" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
Metric Size Drill-Point Counterbores
The same tool lets you drill and counterbore holes with enough clearance for socket head screws.
For technical drawings and 3-D models, click on a part number.
Dia. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Screw Size, mm  | Body, mm | Shank | Drill Tip, mm | Overall Lg. | Maximum Hole Drilling Depth, mm | Number of Flutes | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
| 8 | 13.49 | 7/16" | 8.73 | 1 13/16" | 11.11 | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
Chip-Clearing Tap and Drill Bit Sets for Through-Holes
Also known as gun taps, the taps in these sets have spiral-point flutes that 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. Taps have a square shank for compatibility with tap wrenches and tap holders for drill presses and milling machines. With a plug chamfer, they have 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping. All taps and drill bits are made of high-speed steel for use on most metal and plastic.
For technical drawings and 3-D models, click on a part number.
| No. of Pieces | Chamfer Type | Tap Sizes Included | Thread Type | No. of Flutes | Pitch Dia. Limit | Drill Bit Sizes Included | Drill Bit Material | Container Type | Each | |
Gold Oxide High-Speed Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 18 | Plug | M2.5 × 0.45 mm M3 × 0.5 mm M3.5 × 0.6 mm M4 × 0.7 mm M5 × 0.8 mm M6 × 1.00 mm M8 × 1.25 mm M10 × 1.5 mm M12 × 1.75 mm | Metric | 2, 3 | D3, D4, D5, D6 | 2.05 mm 2.5 mm 2.9 mm 3.3 mm 4.2 mm 5 mm 6.7 mm 8.5 mm 10.2 mm | Gold Oxide High-Speed Steel | Metal Case | 00000000 | 0000000 |