Drill America DEWCBR Series Qualtech High-Speed Steel Counterbore - 4 Morse Taper Shank, 7/16" Pilot, 8-1/8" Length, 1-7/8" Size (Single Unit) - Perfect for Metalworking, Woodworking & Precision Drilling Applications
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SKU:22060570
Product Description
Drill America Qualtech DEWCBR series taper shank counterbore. Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1/8-inches or less), the operation is usually known as spot-facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. This counterbore is made of two-piece construction, having an integral shank and counterbore-cutter, and a pilot that is interchangeable, which provides flexibility in the use of the tool. High-speed steel tool is good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Morse taper shank allows the tool to be inserted directly into the machine's spindle to facilitate high-torque applications such as large cut diameters.
Product Features
High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
Morse taper shank allows the tool to be inserted directly into the machine's spindle to facilitate high-torque applications such as large cut diameters
Counterboring is the enlargement of a portion of a hole that has previously been formed
The counterbor is a two-piece construction, having an integral shank and counterbore-cutter, and a pilot that is interchangeable, which provides flexibility in the use of the tool
1-7/8-inches size
Customer Reviews
I bought several sizes of these but will just leave one review for this size option. They are the typical import tooling, nothing fantastic but serviceable - these do work fairly well. Best if you can slow down the RPM of course so if you're using in a drill press the slowest speed on most presses will be too fast - use cutting oil and mind your feed and technique in that case. I ran this one for 13 holes in 6061 and it was no worse for wear other than clinging metal (normal). With a lucky fit, I later used it as a full bore reamer for some short stainless (304 I think) shaft collars and it did surprisingly well there other than surface finish but did take a toll on the cutting edges, which I was able to touch up well enough. I used one of the other sizes in nylon and it was only ok there...not quite sharp enough for a high quality cut in that material (may do better in delrin, not sure how it would like polycarbonate...probably frustrating in soft plastics). So...good value, worth the purchase for hobby or occasional use in common and/or softer materials. Have to use these correctly, don't treat them like they're drill bits.
