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Precision Twist QC91G High Speed Steel Long Length Drill Bit, TiN Coated, Round Shank, Parabolic Flute, 135 Degree Point Angle

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Product Specifications
Cutting Direction
Right-Hand
Finish Types
TiN
Shank Type
Round
Material Type
High-Speed Steel
Drill Point
Conventional
UNSPSC Code
20121600
Cutting Angle
135  Degrees
Brand Name
Precision Twist
Flute Type
Parabolic

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Currently showing 1-20 of 44 Next 20 »
#2 QC91G Wire Gauge 3-3/4" 6-1/8" 12 50902 B00271FYSS yes $219.60 Buy Options
#4 QC91G Wire Gauge 3-5/8" 6" 12 50904 B002E8OMYQ yes $200.21 Buy Options
#7 QC91G Wire Gauge 3-5/8" 6" 12 50907 B00271FYUQ yes $200.21 Buy Options
#8 QC91G Wire Gauge 3-5/8" 6" 12 50908 B002E8TITK yes $200.21 Buy Options
#9 QC91G Wire Gauge 3-5/8" 6" 12 50909 B00271BZJK yes $200.21 Buy Options
#10 QC91G Wire Gauge 3-5/8" 6" 12 50910 B002E8TIUO yes $200.09 Buy Options
#11 QC91G Wire Gauge 3-5/8" 6" 12 50911 B0025Q8XGA yes $200.09 Buy Options
#15 QC91G Wire Gauge 3-3/8" 5-3/4" 12 50915 B002E8VJ4M yes $50.01 Buy Options
#17 QC91G Wire Gauge 3-3/8" 5-3/4" 12 50917 B002E8VJ6K yes $181.93 Buy Options
#19 QC91G Wire Gauge 3-3/8" 5-3/4" 12 50919 B00271I3HM yes $169.73 Buy Options
#20 QC91G Wire Gauge 3-3/8" 5-3/4" 12 50920 B0026H8VOC yes $169.83 Buy Options
#21 QC91G Wire Gauge 3-3/8" 5-3/4" 12 50921 B00208ZXH0 yes $169.73 Buy Options
#22 QC91G Wire Gauge 3-3/8" 5-3/4" 12 50922 B002E8TJ1C yes $46.74 Buy Options
#27 QC91G Wire Gauge 3" 5-3/8" 12 50927 B002E8ONAO yes $147.54 Buy Options
#28 QC91G Wire Gauge 3" 5-3/8" 12 50928 B0026H5RIA yes $147.54 Buy Options
#30 QC91G Wire Gauge 3" 5-3/8" 12 50930 B00271DXTU yes $147.54 Buy Options
#31 QC91G Wire Gauge 2-3/4" 5-1/8" 12 50931 B0026HEGMI yes $125.18 Buy Options
#32 QC91G Wire Gauge 2-3/4" 5-1/8" 12 50932 B002E8XMB0 yes $127.71 Buy Options
#33 QC91G Wire Gauge 2-3/4" 5-1/8" 12 50933 B0026H8VRY yes $127.71 Buy Options
#34 QC91G Wire Gauge 2-3/4" 5-1/8" 12 50934 B002E8VJE2 yes $127.72 Buy Options

Key Features

  • Parabolic flute design offers enhanced chip removal, coolant flow to the drill point, and heat dissipation
  • Long length drill bits, also called taper length, have longer flutes and overall lengths than jobber drill bits
  • 135-degree radius split-point is self-centering, reduces walking, good for hard material, and reduces pressure on cutting edges
  • Titanium nitride (TiN) is a coating to extend cutting tool life and permit faster cutting speeds than with uncoated tools
  • High-speed steel (HSS), for use on a wide variety of materials

Product Description

The Precision Twist QC91G taper-length drill bit is a parabolic flute design, 135-degree radius, split-point, round shank drill bit made of HSS with a TiN finish, which is a hard, gold-colored ceramic coating that has low friction, permitting faster cutting speeds than uncoated materials. It is suitable for drilling to a depth up to six times the diameter of the drill. Good for portable or machine drilling. The shank diameter is the same as the drill size. It was designed for drilling holes into a wide variety of metals and synthetic materials with best performance in steel, cast iron, copper, and aluminum magnesium.

The QC91G series has a wide land parabolic flute design that enhances chip (also called swarf) formation and evacuation. Coolant has a better flow to the drill point for heat dissipation, and can operate at higher speeds and feeds for increased productivity. It is recommended to use a constant heavy feed rate while drilling. This design has a reinforced web which provides increased drill strength and rigidity, and straighter, closer tolerance holes.

Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits are commonly used to drill holes with hand-operated drills, standalone drill presses, or lathes. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. These drill bits have a right-hand twist that brings chips up and away from the cutting edge. They are made to ANSI (fractional) industry standards, which helps ensure that drill bits around the world conform to the same specifications.

Precision manufactures machine tools under the following brands: Precision Twist, Precision Dormer, and Union Butterfield. They have locations around the world, and provide tools adhering to ANSI, NAS, and DIN standards.

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