Drill Bit Decimal Size Equivalents
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About Drill Bits
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Short-Length Drill Bits
Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'- and maintenance-length drill bits.
Black-oxide drill bits produce less friction than uncoated drill bits.
Titanium-nitride (TiN) coated drill bits last longer and can drill at higher speeds than uncoated and black-oxide 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 | Specifications Met | For Use On | Each | |
Metric | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
4.0 mm | 0.1575" | 55mm | 13.9mm | Round | 4mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 00000000 | 00000 |
4.1 mm | 0.1614" | 55mm | 10.2mm | Round | 4.1mm | Standard | DIN 1897 | Steel, Iron, Stainless Steel | 00000000 | 0000 |
4.2 mm | 0.1654" | 55mm | 13.5mm | Round | 4.2mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 00000000 | 0000 |
Titanium-Nitride (TiN) Coated High-Speed Steel | ||||||||||
4.1 mm | 0.1614" | 55mm | 10.2mm | Round | 4.1mm | Standard | DIN 1897 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 0000000 | 0000 |
Smooth-Finish Carbide Drill Bits
Three cutting edges instead of the typical two enable these bits to drill holes with a smoother finish than other bits. Made of solid carbide for the highest accuracy and longest tool life, they are harder, stronger, and more wear resistant than high-speed steel, cobalt steel, and carbide-tipped bits. They retain a sharp, hard edge at high temperatures for the best performance on hard and abrasive material. These bits require rigid toolholding to prevent breakage and should not be used in hand-held drilling. All are jobbers’ length so they have the rigidity and length required for most applications. A split point keeps the bit centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Shank Size | Point Style | For Use On | Each | |
Metric | |||||||||
Uncoated Carbide | |||||||||
4.0 mm | 0.1575" | 55mm | 21.9mm | Round | 4mm | Split | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 000000 | 000000 |
4.2 mm | 0.1654" | 55mm | 21.9mm | Round | 4.2mm | Split | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |