Click for larger image and other views Image is representative of the product family. Select individual products in the table below for more specific images and product specifications

How can we improve our images or Product Specifications?

Alvord Polk 155-H High-Speed Steel Taper Pin Reamer, Left Hand Helical Flute, Round Shank, Uncoated (Bright)

Be the first to review this item

Product Specifications
Cutting Direction
Right Hand
Finish Types
Uncoated (Bright)
Shank Type
Material Type
High Speed Steel
Brand Name
Alvord Polk
Flute Type
Left Hand Fast Helix

This item is no longer available

These items ship for FREE with 2-Day Shipping on orders over $50. (Details)

Want it delivered on Fri, May 8? Order in-stock items in the next 23 hrs 11 mins and choose One-Day Shipping at checkout.

  • Share
Currently showing 1-16 of 16
Measurement system Size name ASIN

The Amazon Standard Item Number (ASIN) uniquely identifies
the item in the (and Amazon) catalog.


If an item is currently out of stock, but has an estimated lead time, you can place an order now and we will ship it as soon as it is available.
You can also order more than we currently have in stock.
Read more about back orders in our help section.

All All      
Currently showing 1-16 of 16
Taper Pin 0 B002PHNG66 yes $26.87 Buy Options
Taper Pin 1 B002PHNG6G yes $26.87 Buy Options
Taper Pin 10 B002PHNG9I yes $127.24 Buy Options
Taper Pin 2 B002PHNG6Q yes $26.87 Buy Options
Taper Pin 3 B002PHNG7A yes $29.29 Buy Options
Taper Pin 4 B002PHNG7K yes $29.29 Buy Options
Taper Pin 5 B002PHNG7U yes $33.78 Buy Options
Taper Pin 6 B002PHNG84 yes $37.41 Buy Options
Taper Pin 7 B002PHNG8E yes $46.78 Buy Options
Taper Pin 8 B002PHNG8O yes $52.04 Buy Options
Taper Pin 9 B002PHNG98 yes $99.68 Buy Options
Taper Pin 2/0 B002PHNG5M yes $40.10 Buy Options
Taper Pin 3/0 B002PHNG5C yes $29.29 Buy Options
Taper Pin 4/0 B002PHNG52 yes $29.29 Buy Options
Taper Pin 5/0 B002PHNG4S yes $29.29 Buy Options
Taper Pin 6/0 B002PHNG48 yes $10.42 Buy Options

Key Features

  • Helical reamers are intended for use in a CNC machine, drill press, or similar, since a lot of torque is needed to effectively drive the tool
  • Taper pin reamers are intended to ream holes for taper pins, which are a standardized fastener
  • Left-hand helical reamers are good for use in through holes (holes that extend all the way through a workpiece) in difficult or long-chipping materials, as they push chips ahead of the tool and into the hole
  • Helical reamers are recommended for reaming holes with interruptions, as they prevent damage to the workpiece edge and tool, when used in a machine with rigid toolholding
  • Uncoated (bright) tools have no finish or coating. They are a good choice for general purpose applications

Product Description

The Alvord Polk 155-H left-hand helical flute taper pin reamer is a round shank tool made of high-speed steel with no finish or coating, and is most commonly chosen for reaming holes in difficult or long-chipping materials that are intended to receive taper pins. Taper pins are standardized tapered fasteners with one end having a slightly larger diameter than the other end, in order to easily enter a reamed hole and hold itself through friction.

Left-hand helical reamers are useful for interrupted cuts and in through holes. Helical reamers prevent whole flute contact with the leading edge in an interrupted cut, as in a keyway. This prevents damage to the interruption and reamer flute. Left-hand helical style tools also push chips ahead of the tip of the tool, instead of pulling chips out of a hole. Left-hand helical reamers are also useful for reaming through holes, since pushing chips into the hole can cause clogging, which may damage the tool. Helical reamers have a more aggressive rake angle than spiral reamers. This means that while they are both used for similar purposes, helical reamers are intended to be used by a drill press or CNC machine, unlike a spiral reamer, which can be used either by hand or in a machine. Helical reamers cannot easily be used by hand, since the action of the high rake angle means that more force is needed to drive the tool, when used in manually-fed machines they will sometimes push the reamer back up out of the hole.. The round shank (minus a square section on the end) shows the user clearly that this tool is not meant to be used with a tap wrench, i.e. driven by hand. High-speed steel is a general purpose steel for cutting tools and is compatible with many metalworking materials. It is often lower in price than other cutting tool materials.

For reamers in the 155-H series with taper pin size 7/0 to 9 there are three flutes, and for size 10 there are four flutes. Tolerances for machining this reamer series are +.0030 / +.0060 inches.

Reamers are used to finish existing holes. When holes are created using common applications like drilling or punching they often have minute imperfections. Their roundness may be flawed, or their diameter may be slightly smaller than required. Reamers are made to exacting tolerances, so they can correct such errors and create precisely round holes of exacting dimensions. Reaming is often used before tapping screw threads.

Alvord Polk manufactures a broad family of cutting tools, brushes, and tooling components, following ISO 9001 standards for quality and environmental impact of their products. Their offices and manufacturing facilities have been located in the United States since 1881.

How can we improve our Product Description?

Customer Reviews

There are no customer reviews yet.

Be the first to review this item

Go to the HomePage

Order by Phone
M-F 8am-10pm ET, Sat-Sun 8am-5pm ET 800-220-4242

My Account| Returns| Help

Website Feedback| Contact Us| Sell on AmazonSupply| Become an Affiliate

Privacy Notice| Conditions of Use

Follow Us 

© 2015, Inc. and its affiliates.