Bridge Reamers

Product Category

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Reamer Type

Bridge and construction reamers describe two similar types of reamers. Both are tapered to allow the reamer to enter overlapping and misaligned holes where extremely precise tolerances are not necessary, but construction reamers are generally shorter and have a stop collar for safety and depth control, while bridge reamers tend to be longer and have a tapered shank.

Chucking reamers, also known as machine reamers, have a 45-degree bevel lead and cut only on that lead, and a round shank that cannot be used with a wrench, i.e. driven by hand. Chucking reamers are the most commonly used type of reamer. They are used in drill presses, turret lathes, screw machines, and other machine tools. "CNC length chucking reamers" have a shorter overall length than "chucking reamers," and are intended to be used at higher speeds with less vibration than a longer tool.

Hand reamers have a long taper lead to compensate for the difficulty of manually starting a hole. Unlike chucking reamers, hand reamers cut on the bevel lead and the taper lead. An adjustable wrench or straight-handle tap wrench is the best tool to use with these reamers.

Taper pin reamers are designed to ream tapered holes designed to fit standard taper pins. They are used with both hand and machine tools.

Taper pipe reamers are intended for reaming holes that meet the standard for pipes and holes that will be tapped with American National Standard Taper Pipe (NPT).

Cutting Tools
- Reamers
  - Bridge & Construction Reamers
    - Bridge Reamers

Material Type

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High Speed Steel (HSS)

Steel

Finish

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Uncoated (Bright)

Shank Type

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Morse Taper

Tool Flute Type

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Tool Flute Type
Flute
Type

Conventional spiral flutes can be used for drilling holes in a wide range of materials. Drill bits with conventional spiral flutes are used in a clockwise direction, which may also be called right-hand or right-handed. The helix angle ranges from 28 to 32 degrees.

Fast spiral flutes have a higher helix angle than conventional spiral flutes, providing more efficient chip removal when drilling deep holes and when drilling materials that produce stringy chips, such as softer ferrous and non-ferrous materials. Drill bits with fast spiral flutes are used in a clockwise direction. The helix angle ranges from 35 to 45 degrees.

Half round flutes have a straight cutting edge with no turns or twist in the flutes. The single flute results by removing half the body of the drill bit along its central axis, creating a half round appearance when viewed from the tip. Half round flutes are typically used in horizontal applications such as drilling on a lathe, because gravity will aid in pulling the chips out of the hole as it is being drilled. Drill bits with half round flutes are used in a clockwise direction. The helix angle is zero degrees.

Left-hand fast spiral flutes have helical twists in the opposite direction and a higher helix angle than conventional spiral flutes, providing more efficient chip removal when drilling deep holes and when drilling materials that produce stringy chips, such as softer ferrous and non-ferrous materials. Drill bits with left-hand fast spiral flutes are used in a counterclockwise direction. The helix angle ranges from 35 to 45 degrees.

Left-hand spiral flutes have helical twists in the opposite direction than conventional spiral flutes and can be used for drilling holes in a wide range of materials. Drill bits with left-hand spiral flutes are used in a counterclockwise direction. Left-handed spirals are commonly used with a reversible drill to assist with removal of broken fasteners. They can also be used in multiple spindle gear-driven drilling heads or screw machines. The helix angle ranges from 28 to 32 degrees.

Parabolic spiral flutes have larger flutes than a fast spiral, providing increased space for efficient chip removal when drilling deep holes in a wide range of materials. Drill bits with parabolic spiral flutes are used in a clockwise direction. The helix angle ranges from 35 to 45 degrees.

Slow spiral flutes have a lower helix angle than conventional spiral flutes. Slow spiral flutes provide efficient chip removal with high feed rates for shallow holes and in short-chipping materials such as brass, bronze, and cast iron. Drill bits with slow spiral flutes are used in a clockwise direction. The helix angle ranges from 10 to 20 degrees.

Straight flutes have straight cutting edges with no twists in the flutes, providing efficient chip removal in materials that produce short chips such as in brass, other non-ferrous materials, and cast iron. Straight flutes, commonly used for horizontal drilling applications, prevent the drill bit from drawing or pulling itself into the material while drilling. Drill bits with straight flutes are used in a clockwise direction. The helix angle is zero degrees.

Conventional Spiral

Fast Spiral

Half Round

Left Hand Fast Spiral
Left Hand Spiral

Parabolic Spiral

Slow Spiral
Straight

International Shipping

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Alvord Polk

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Alvord Polk 625-0 High-Speed Steel Bridge Reamer, Straight Flute, Morse Taper Shank, Uncoated (Bright)