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AYTWJSKD90HSS Counterbore Drill 90° SKDSold0pcsThe WJ HSS Countersink 90° SKD cuts a conical recess so a flat-head (countersunk) screw finishes flush with the surface. End angle separates it from the 180° SKD: 90° is conical and matches countersunk and taper heads, while 180° is flat-bottomed for socket head cap and other flat-seated screws - the two are not interchangeable. The body diameter bands differ slightly too: 90° reaches 25mm, 180° reaches 20mm. If you only need to deburr a hole mouth, the NCSD spotting drill carries a chamfering use and suits that step better. Substrate HSS, uncoated, rated to HRC30. Sizes cover screw sizes M3~M12, body diameter 6.4~25mm, flute length 35~68mm, overall length 65~115mm and shank 6.4~12.5mm, in 7 variants. Made in Taiwan. How do you check the angle is right? Look at the screw head cone - standard metric countersunk screws use a 90° included angle, matching this tool. Do you drill first? Yes - open the through hole with an ordinary drill, then form the cone with this tool. Can it cut stainless? Not recommended; listed materials are carbon and alloy steel plus aluminium and copper. Typical applications: countersinks for flat-head screws, assembly faces that must finish flush, and recessing screws in sheet-metal and panel parts. The same family also includes the 180° counterbore SKD180 (body diameter 6.5~20mm, overall length 65~115mm), which cuts a flat-bottomed seat for socket head cap and other flat-seated screws; choose the 90° SKD90 (body diameter 6.4~25mm) for countersunk screws. If the hole mouth only needs deburring or chamfering, skip the counterbore tool and switch to the NCSD spotting drill (diameter 3~25mm).

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HSS Counterbore Drill 90° SKD

The WJ HSS Countersink 90° SKD cuts a conical recess so a flat-head (countersunk) screw finishes flush with the surface.

Specifications (7 items)

Part No.	Standard	Dia.	Major dia.	Flute length	Overall length	Shank dia.
AYTWJSKD90-M3	M3	3.4	6.4	35	65	6.4
AYTWJSKD90-M4	M4	4.5	8.4	42	75	8.4
AYTWJSKD90-M5	M5	5.5	10.4	50	85	10.4
AYTWJSKD90-M6	M6	6.6	12.5	53	90	12.5
AYTWJSKD90-M8	M8	9	16.5	53	100	12
AYTWJSKD90-M10	M10	11	21	63	110	12
AYTWJSKD90-M12	M12	13	25	68	115	12

Specification Range

Diameter	3.4~13mm
Large diameter	6.4~25mm
Flute length	35~68mm
Overall length	65~115mm
Shank diameter	6.4~12.5mm

Product Description

The WJ HSS Countersink 90° SKD cuts a conical recess so a flat-head (countersunk) screw finishes flush with the surface. End angle separates it from the 180° SKD: 90° is conical and matches countersunk and taper heads, while 180° is flat-bottomed for socket head cap and other flat-seated screws - the two are not interchangeable. The body diameter bands differ slightly too: 90° reaches 25mm, 180° reaches 20mm. If you only need to deburr a hole mouth, the NCSD spotting drill carries a chamfering use and suits that step better. Substrate HSS, uncoated, rated to HRC30. Sizes cover screw sizes M3~M12, body diameter 6.4~25mm, flute length 35~68mm, overall length 65~115mm and shank 6.4~12.5mm, in 7 variants. Made in Taiwan. How do you check the angle is right? Look at the screw head cone - standard metric countersunk screws use a 90° included angle, matching this tool. Do you drill first? Yes - open the through hole with an ordinary drill, then form the cone with this tool. Can it cut stainless? Not recommended; listed materials are carbon and alloy steel plus aluminium and copper. Typical applications: countersinks for flat-head screws, assembly faces that must finish flush, and recessing screws in sheet-metal and panel parts. The same family also includes the 180° counterbore SKD180 (body diameter 6.5~20mm, overall length 65~115mm), which cuts a flat-bottomed seat for socket head cap and other flat-seated screws; choose the 90° SKD90 (body diameter 6.4~25mm) for countersunk screws. If the hole mouth only needs deburring or chamfering, skip the counterbore tool and switch to the NCSD spotting drill (diameter 3~25mm).

Workpiece Materials & Hardness

Steel (P)
Non-ferrous metals (N)

Max. workpiece hardness HRC30

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