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AYTWJSKD180HSS Counterbore Drill 180° SKDSold0pcsThe WJ HSS Counterbore 180° SKD machines flat-bottomed counterbores; the 180° refers to an almost completely flat end face, producing a flat seat for socket head cap screws and similar flat-seated fasteners. Angle is what separates it within the category: the SKD90 cuts a conical countersink for flat-head (countersunk) screws, and because the two suit entirely different screw heads they are not interchangeable. If you only need to deburr or chamfer a hole mouth, the NCSD spotting drill in this catalogue carries a chamfering use and suits that step better. Substrate HSS, uncoated, rated to HRC30. Sizes cover screw sizes M3~M12 plus imperial 1/4"~1/2", body diameter 6.5~20mm, flute length 35~68mm, overall length 65~115mm and shank 6.5~12mm, in 11 variants. Made in Taiwan. How do you choose between 180° and 90°? By the screw head: socket head cap and flat-seated bolts take the 180° flat bottom, countersunk heads take the 90°. Do you drill first? Yes - a counterbore is a second operation, opening up a hole that an ordinary drill has already made. Can it cut stainless? Not recommended; listed materials are carbon and alloy steel plus aluminium and copper. Typical applications: counterbore seats for socket head cap screws, flat-bottomed recesses in machine parts, and recessing screws in moulds and jigs.
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Cutting ToolsDrillForm Drill
HSS Counterbore Drill 180° SKD
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Counterbore

HSS Counterbore Drill 180° SKD

The WJ HSS Counterbore 180° SKD machines flat-bottomed counterbores; the 180° refers to an almost completely flat end face, producing a flat seat for socket head cap screws and similar flat-seated fasteners.

Specifications (11 items)

Part No.StandardDia.Major dia.Flute lengthOverall lengthShank dia.
AYTWJSKD180-M3M33.46.535656.5
AYTWJSKD180-M4M44.5842758
AYTWJSKD180-M5M55.59.550859.5
AYTWJSKD180-M6M66.611539011
AYTWJSKD180-1_41/46.911539011
AYTWJSKD180-5_165/168.9145310012
AYTWJSKD180-M8M89145310012
AYTWJSKD180-3_83/810.5156311012
AYTWJSKD180-M10M101117.56311012
AYTWJSKD180-M12M1214206811512
AYTWJSKD180-1_21/214.7206811512

Specification Range

Diameter3.4~14.7mm
Large diameter6.5~20mm
Flute length35~68mm
Overall length65~115mm
Shank diameter6.5~12mm

Product Description

The WJ HSS Counterbore 180° SKD machines flat-bottomed counterbores; the 180° refers to an almost completely flat end face, producing a flat seat for socket head cap screws and similar flat-seated fasteners. Angle is what separates it within the category: the SKD90 cuts a conical countersink for flat-head (countersunk) screws, and because the two suit entirely different screw heads they are not interchangeable. If you only need to deburr or chamfer a hole mouth, the NCSD spotting drill in this catalogue carries a chamfering use and suits that step better. Substrate HSS, uncoated, rated to HRC30. Sizes cover screw sizes M3~M12 plus imperial 1/4"~1/2", body diameter 6.5~20mm, flute length 35~68mm, overall length 65~115mm and shank 6.5~12mm, in 11 variants. Made in Taiwan. How do you choose between 180° and 90°? By the screw head: socket head cap and flat-seated bolts take the 180° flat bottom, countersunk heads take the 90°. Do you drill first? Yes - a counterbore is a second operation, opening up a hole that an ordinary drill has already made. Can it cut stainless? Not recommended; listed materials are carbon and alloy steel plus aluminium and copper. Typical applications: counterbore seats for socket head cap screws, flat-bottomed recesses in machine parts, and recessing screws in moulds and jigs.

Workpiece Materials & Hardness

  • Steel (P)
  • Non-ferrous metals (N)

Max. workpiece hardness HRC30

Tags

  • Counterbore

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