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Dormer A345 High-Speed Steel Extra-Long Length Drill Bit, Black Oxide Finish, Morse Taper Shank, Spiral Flute, 118 Degree Point Angle

(1 customer review)

Product Specifications
Cutting Direction
Finish Types
Black Oxide
Material Type
High-Speed Steel
Drill Point
Brand Name
Flute Type
Manufacturer Series #
Shank Type
Style Name
Extra-Long Length

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Currently showing 1-20 of 59 Next 20 »
3/8 " Inch Morse Taper 185 mm 285 mm 1 418307 B003JY60IK yes $17.85 Buy Options
13/32" Inch Morse Taper 185 mm 285 mm 1 418116 B003JY5ZUY yes $83.94 Buy Options
7/16" Inch Morse Taper 195 mm 300 mm 1 418369 B003JY60PS yes $76.43 Buy Options
29/64" Inch Morse Taper 205 mm 310 mm 1 418284 B003JY60GM yes $95.21 Buy Options
1/2 " Inch Morse Taper 205 mm 310 mm 1 418055 B003JY5ZO0 yes $83.85 Buy Options
17/32" Inch Morse Taper 220 mm 325 mm 1 418161 B003JY5ZZO yes $45.33 Buy Options
9/16" Inch Morse Taper 220 mm 340 mm 1 418413 B003JY60VC yes $26.65 Buy Options
37/64" Inch Morse Taper 220 mm 340 mm 1 418321 B003JY60M6 yes $197.99 Buy Options
39/64" Inch Morse Taper 230 mm 355 mm 1 418338 B003JY60N0 yes $59.29 Buy Options
5/8" Inch Morse Taper 230 mm 355 mm 1 418352 B003JY60OY yes $106.26 Buy Options
41/64" Inch Morse Taper 230 mm 355 mm 1 418345 B003JY60O4 yes $60.33 Buy Options
21/32" Inch Morse Taper 230 mm 355 mm 1 418215 B003JY605S yes $208.03 Buy Options
11/16" Inch Morse Taper 245 mm 370 mm 1 418086 B003JY5ZRC yes $157.19 Buy Options
3/4" Inch Morse Taper 260 mm 385 mm 1 418291 B003JY60HG yes $48.17 Buy Options
7/8" Inch Morse Taper 270 mm 405 mm 1 418376 B003JY60QW yes $77.89 Buy Options
1" Inch Morse Taper 290 mm 440 mm 1 418031 B003JY5ZMW yes $230.54 Buy Options
1-1/4" Inch Morse Taper 320 mm 480 mm 1 418048 B003JY5ZNG yes $324.62 Buy Options
8mm Metric Morse Taper 165 mm 265 mm 1 418383 B003JY60RQ yes $62.39 Buy Options
8.50mm Metric Morse Taper 165 mm 265 mm 1 418390 B003JY60SU yes $93.73 Buy Options
9mm Metric Morse Taper 175 mm 275 mm 1 418406 B003JY60TO yes $82.08 Buy Options

Key Features

  • Extra-length, for deeper holes
  • Morse taper shank, for a secure and accurate tool-holding system
  • 118-degree, web-thinned, conventional point angles, for reduced drilling pressure
  • Black oxide finish, for improving lubricity, resisting corrosion, and resistances to chipping or flaking
  • High-speed steel (HSS), for use on a wide variety of materials

Product Description

The Dormer A345 extra-length, black oxide-coated, general-purpose Morse taper shank drill bit drills holes into a wide variety of metals and synthetic materials. It can drill to a depth up to ten times the diameter of the drill size. The shank diameter is the same as the drill size.

The A345 series has a type N flute form, with a regular helix (21 to 34 degrees) angle, and performs best when drilling into magnetic soft steel or structural steel (case carburizing steel). Black oxide helps to prevent buildup and welding of material on the drill’s cutting edge when working with iron and steel. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. Right-hand twist brings chips up and away from the cutting edge. The extra length allows for more freedom in being able to drill a wider variety of circumstances.

The principle of a Morse taper is that of the cone in the cone. The trunnion (the male portion – drill shank) and the bore (the female portion – the tool- holder) are both uniformly tapered. This system allows for torque to be transferred directly to the drill through the friction between the taper shank and the tool holder. The tang at the end of the taper is used for ejecting the drill bit from the spindle, with the aid of a drift pin.

Drilling, or hole making, is the most common metalworking operation in the world and twist drill bits are the most common type of drill bit. They can be used in hand-operated drills, standalone drill presses, or a lathe. They are made to DIN 340 industry standards, which ensure that drill bits around the world conform to the same specifications.

Together, the Precision Twist and Dormer brands represent a strong tool brand for high-productivity carbide and high-speed steel drill and tap products. Precision was founded in 1952 in Crystal Lake, IL. Dormer Tools, founded in 1913 in Sheffield, England, is known for innovative metalworking products.

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