Counterbores, Counterbore Drill Bit Sets | RS
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    Counterbores

    If you're looking for counterbores, you've come to the right place. RS stocks many counterbores drill bit sets for your toolbox or workshop. Counterbores are short cylindrical cutters used to enlarge a hole made by another tool, thus forming a counterbore. Counterbores can often be identified by a blunt point or lip, which is the diameter of the hole it's intended to form.

    What Is A Counterbore?

    A counterbore is a small hole, usually circular or square, that is drilled into a workpiece. The purpose of a counterbore drill is to allow for the insertion of another fastener into the hole, such as a screw or bolt. Counterbores are used frequently in woodworking and machining applications but can also be used in other industries.

    Most commonly, counterbores are used to create a flat surface on top of a hole, which is then filled with some type of fastener. A common application would be to install a bolt head in an existing threaded hole. The diameter of the counterbore will determine how deep it goes into the material being drilled out.

    Counterboring is also used when installing threaded inserts into materials such as ceramic or plastic. In this case, the insert itself has threads that connect with other threads within the material being drilled out. These inserts are made from metal and allow screws or bolts to be installed without drilling holes though this may not always be necessary.

    How To Counterbore A Hole

    When you're trying to counterbore a hole in metal, you'll need to know how much material will be removed when you make the cut. If your part has a lot of material inside it, it's better to leave some behind than to remove too much at once. You can check your workpiece by holding it up against a straight edge and looking at where it meets the edge - if there's not enough space between the two pieces for them to fit together, then you'll want to leave more material in place.

    Once you've determined how much material needs to be removed from your part before counterboring, assemble your equipment and start drilling as normal. However, use an offset tool or countersink instead of an ordinary drill bit when boring through metal. These tools are designed specifically for boring into metal without damaging the surface underneath.

    Features of a Counterbore

    A counterbore is typically made from a single piece of steel and has three basic features:

    • Able to be used with conventional power tools: Counterbores are available in different sizes and can be used with hand-held drills or more powerful power tools such as lathes and milling machines.
    • No protruding fixings: The countersinking part of this bit extends below the surface, meaning there are no protruding fixings or screws visible when installed into place, making them ideal for applications where appearance is important such as furniture or kitchen fittings.
    • Increase the aesthetic appeal of the finished product: Counterbores can be used to create holes in countertops with perfectly round edges. This helps to make them look more attractive.

    23 Products showing for Counterbores

    RS PRO
    Counterbore
    6.6mm
    M6
    -
    11mm
    18mm
    Plain
    1
    8 mm
    80 mm
    HSS
    RS PRO
    Counterbore Set
    -
    M3 to M10
    -
    -
    -
    -
    6
    -
    -
    HSS
    RS PRO
    Counterbore
    11mm
    M10
    -
    18mm
    22mm
    Plain
    1
    12.5 mm
    100 mm
    HSS
    RS PRO
    Counterbore
    13mm
    M12
    13.5mm
    20mm
    25.5mm
    Screwed
    1
    12 mm
    108 mm
    HSS
    RS PRO
    Counterbore
    9mm
    M8
    -
    15mm
    22mm
    Straight
    1
    12.5 mm
    100 mm
    HSS
    RS PRO
    Counterbore
    3.4mm
    M3
    -
    6mm
    14mm
    Plain
    1
    5 mm
    71 mm
    HSS
    RS PRO
    Counterbore Set
    -
    M3 to M10
    -
    -
    -
    -
    12
    -
    -
    HSS
    RS PRO
    Counterbore
    5.3mm
    M5
    6.5mm
    10mm
    12.5mm
    Screwed
    1
    6 mm
    70 mm
    HSS
    RS PRO
    Counterbore
    5.5mm
    M5
    -
    10mm
    18mm
    Plain
    1
    8 mm
    80 mm
    HSS
    RS PRO
    Counterbore
    6.4mm
    M6
    8mm
    11mm
    12.5mm
    Screwed
    1
    6 mm
    76 mm
    HSS
    RS PRO
    Counterbore
    4.5mm
    M4
    -
    8mm
    14mm
    Plain
    1
    5 mm
    71 mm
    HSS
    RS PRO
    Counterbore
    4.3mm
    M4
    5.5mm
    8mm
    12.5mm
    Screwed
    1
    6 mm
    65 mm
    HSS
    RS PRO
    Counterbore
    14mm
    M12
    -
    20mm
    22mm
    Plain
    1
    12.5 mm
    100 mm
    HSS
    RS PRO
    Counterbore
    8.4mm
    M8
    9.5mm
    15mm
    19mm
    Screwed
    1
    10 mm
    87.3 mm
    Steel
    RS PRO
    Counterbore
    10.5mm
    M10
    11mm
    18mm
    19mm
    Screwed
    1
    10 mm
    89 mm
    HSS
    EXACT
    Counterbore Set
    -
    M3 to M10
    -
    -
    -
    -
    6
    -
    -
    HSS
    EXACT
    Counterbore
    9mm
    M8
    -
    15mm
    -
    Plain
    1
    12.5 mm
    100 mm
    HSS
    EXACT
    Counterbore
    4.5mm
    M4
    -
    8mm
    -
    Plain
    1
    5 mm
    71 mm
    HSS
    EXACT
    Counterbore
    6.6mm
    M6
    -
    11mm
    -
    Plain
    1
    8 mm
    80 mm
    HSS
    Tivoly
    Counterbore
    6 → 18mm
    -
    -
    -
    -
    -
    6
    -
    -
    -
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