Countersinks

Countersinks are cutting tools used to form angled seats in holes, add light chamfers, remove burrs, prepare center holes, and enlarge existing holes. They are common in machining, metalworking, maintenance, shop, and production work where smooth finished edges or compatible countersunk fastener seating is needed.

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Helpful Buying Guide

How to Choose Countersinks

Start with the countersink angle required by the hole, fastener, or machining operation. Then compare tool geometry, cutting diameter or size range, construction, and the type of finishing or hole-preparation work you need to complete.

Visual Guide

Popular examples in this category

82° Zero-Flute Countersink and Deburring Tool #182° Zero-Flute Countersink and Deburring Tool #1WBB1339726High-Speed Steel 6-Flute 3/8-Inch 90-Degree CountersinkHigh-Speed Steel 6-Flute 3/8-Inch 90-Degree CountersinkWBB164637782-Degree Zero-Flute HSS Countersink and Deburring Tool, No. 282-Degree Zero-Flute HSS Countersink and Deburring Tool, No. 2WBB1339755High-Speed Steel 6-Flute Countersink, 1/2 in. Diameter, 90 DegreeHigh-Speed Steel 6-Flute Countersink, 1/2 in. Diameter, 90 DegreeWBB1646362
Use Cases

Match the tool to the finishing task

Choose zero-flute tools for countersinking and light chamfers with smooth, burr-free finished edges. Select single-flute tools for general-purpose chamfering, deburring, and countersinking. Six-flute countersinks are designed to create smooth countersunk seats and support heavy cuts.

How to Choose

Confirm angle, size, and cutting design

Compare the required 60°, 82°, or 90° profile first. Then choose the listed diameter, numbered size, or 1/4 in. to 3/4 in. range that fits the application. Consider flute count and staggered cutting angles when chatter reduction or cutting-load distribution matters.

Applications

Support machining and maintenance work

The represented tools support countersinking holes, preparing holes for compatible fastener seating, creating light chamfers, deburring prepared edges, countersinking center holes, and enlarging existing holes. Listed applications include machine, hand-tool, shop, production, and maintenance work.

Additional Info

Compare construction and setup compatibility

High-speed steel is represented across zero-flute, single-flute, three-flute, and six-flute designs. A cobalt three-flute center reamer countersink set is also represented for demanding metalworking applications. Review the stated angle and diameter before selecting a tool for the setup.

60°Available cutting profile

Represented in a single-flute HSS countersink for chamfering, deburring, and countersinking.

82°Available cutting profile

Represented in zero-flute, six-flute, and three-flute center reamer countersink options.

90°Available cutting profile

Represented in six-flute countersinks and a three-flute center reamer countersink set.

1/4–3/4 in.Listed center reamer range

Available in three-flute center reamer countersink set options.

Comparison Guide

Compare Countersink Types

Use this overview to compare the represented product types by their stated cutting geometry and intended work.

Tool typeKey represented featuresTypical listed use
Zero-flute countersink and deburring tool82° profile; HSS construction; numbered sizesCountersinking holes, light chamfers, and burr-free edge finishing
Six-flute countersink82° or 90° profile; staggered cutting angles; positive shearing actionSmooth countersunk seats, heavy cuts, and chatter-reduction-focused operations
Three-flute center reamer countersink82° or 90° profile; HSS or cobalt; 1/4 in. to 3/4 in. rangeCountersinking center holes and enlarging existing holes
Planning Guide

Plan the right fit before choosing

Start With the Required Profile

Choose the countersink angle for the job

The available countersinks include 60°, 82°, and 90° cutting profiles. The angle is a primary selection point because it defines the countersunk or chamfered profile produced by the tool.

  • Use 60° for listed general-purpose chamfering and countersinking work.
  • Use 82° tools for compatible countersinking, light chamfering, deburring, and center-hole preparation.
  • Use 90° tools for compatible countersunk seat and center-hole countersinking applications.
Compare Tool Geometry

Select flutes based on the operation

Tool designs in this category range from zero-flute and single-flute tools to three-flute center reamers and six-flute countersinks. Each design supports a different type of finishing or hole-preparation work.

  • Zero-flute designs help create smooth, burr-free finished edges.
  • A single-flute design supports smooth surface finishing in chamfering and countersinking.
  • Three-flute center reamers support countersinking center holes and enlarging existing holes.
  • Six-flute designs distribute cutting load across multiple cutting edges; staggered cutting angles help reduce chatter-related harmonics.
Check Size and Construction

Fit the tool to the machining setup

Compare the listed tool size or diameter with the hole-preparation requirement. Available examples include numbered zero-flute tools, 3/8 in., 1/2 in., 3/4 in., and 1 in. diameters, plus center reamer countersink sets covering 1/4 in. to 3/4 in.

  • High-speed steel construction is represented for machining and metalworking tasks.
  • Cobalt construction is available in a three-flute center reamer countersink set for demanding metalworking applications.
  • For six-flute tools, positive shearing action supports heavy cuts and smooth countersunk seats.
FAQ

Common questions before buying

What countersink angles are represented?

The represented products include 60°, 82°, and 90° cutting profiles.

What is a zero-flute countersink used for?

Zero-flute tools are used for countersinking holes, creating light chamfers, and helping produce smooth, burr-free finished edges.

Why choose a six-flute countersink?

Six-flute designs distribute cutting load across multiple cutting edges. The represented tools also use staggered cutting angles to help reduce chatter-related harmonics and positive shearing action to support heavy cuts and smooth seats.

What are center reamer countersinks used for?

The represented three-flute center reamer countersinks are used to countersink center holes or enlarge existing holes.

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