Drill Bit Decimal Size Equivalents
More
About Drill Bits
More
About Tool Steel
More
Drill Bits
![](/prerenderstable/mvPRE/contents/gfx/imagecache/290/2901a124-@halfx_636772183304266254.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/305/30565a312-@halfx_636656210015108587.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/poi/pointstyle-2standard1616184295-p9@halfx_637517631954712677.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/poi/pointstyle-1split-1616184295-p9@halfx_637517631108605069.png?ver=imagenotfound)
These jobbers'-length bits have the rigidity and length required for most applications.
Black-oxide and black-and-gold-oxide drill bits produce less friction 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 | Specifications Met | For Use On | Each | |
Metric | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
8.7 mm | 0.3425" | 125mm | 63.6mm | Round | 8.7mm | Standard | DIN 338 | Steel, Iron, Stainless Steel | 00000000 | 000000 |
Black-and-Gold Oxide High-Speed Steel | ||||||||||
8.7 mm | 0.3425" | 121mm | 86.1mm | Round | 8.7mm | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 000000000 | 0000 |
Short-Length Drill Bits
![](/prerenderstable/mvPRE/contents/gfx/imagecache/289/2896a25-@halfx_636656250280446470.png?ver=imagenotfound)
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.
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 | ||||||||||
8.7 mm | 0.3425" | 84mm | 40mm | Round | 8.7mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 000000000 | 00000 |
Cobalt Steel Drill Bits
![](/prerenderstable/mvPRE/contents/gfx/imagecache/306/3069a25-@halfx_636656247095575657.png?ver=imagenotfound)
These jobbers'-length bits have the rigidity and length required for most applications. 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.
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 | ||||||||||
Uncoated Cobalt Steel | ||||||||||
8.7 mm | 0.3425" | 121mm | 60.7mm | Round | 8.7mm | Split | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 000000000 | 000000 |
Chip-Clearing Cobalt Steel Drill Bits
![](/prerenderstable/mvPRE/contents/gfx/imagecache/299/29925a924-@halfx_636656239009726213.png?ver=imagenotfound)
The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow. With better heat and wear resistance than high-speed steel, these cobalt steel bits can run up to 25% faster and have a longer tool life. 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.
Shank | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Metric—Parabolic Spiral Flute | ||||||||||
Uncoated Cobalt Steel | ||||||||||
8.7 mm | 0.3425" | 125mm | 81mm | Round | 8.7mm | Split | DIN 338 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 000000 |
Hardened Undersized High-Speed M2 Tool Steel Rods
![](/prerenderstable/mvPRE/contents/gfx/imagecache/888/8888k101p1-j01-digital@halfx_637066561461397870.png?ver=imagenotfound)
- Yield Strength: Not Rated
- Hardness: Rockwell C60 (Very Hard)
These rods, also known as drill blanks, have an undersized diameter for machining your own jobbers'-length drill bits. They're hardened for increased abrasion and impact resistance. M2 tool steel offers a nice balance of wear resistance and machinability. It has a high molybdenum content, which allows it to maintain sharp cutting edges even at elevated temperatures.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Dia. | Dia. Tolerance | Drill Bit Size | Lg. | Mechanical Finish | Straightness Tolerance | Each | |
8.7mm | -0.0050mm to 0.0000mm | 8.7 mm | 4 3/4" | Precision Ground | 0.012" per ft. | 00000000 | 00000 |