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AYTWCDCBTAHSS Counterbore Drill JIS DCBTASold0pcsHSS Counterbore Drill JIS DCBTA, a JIS-spec counterbore drill forming the pilot hole and counterbore together - no second setup. Body diameter 6.5~29mm, pilot diameter 3.4~20mm, overall length 60~130mm, available in 14 sizes. Works on carbon steel, alloy steel plus aluminum, copper and other non-ferrous metals up to HRC30. Japanese brand, consistent quality. Typical applications: JIS-size counterbores for socket head cap screws (the catalog lists it for drilling socket head screw holes); the pilot hole and the counterbore are drilled in one pass, with no need to pre-drill and then switch to a counterbore cutter. In the same EIKO family: DCB (screws M3~M12 and W1/4"~W1/2") and the JIS countersink drill DCBSTA; DCBTA follows JIS sizes, so for the same metric screw its counterbore diameter is larger than DCB (e.g. M6: body diameter 11mm, DCB 10.4mm), and it extends to M14~M18. Which size for an M10 screw? Choose M10: pilot diameter 11mm, body diameter 17.5mm. Is there anything above M12? Yes, DCBTA goes up to M18, while DCB stops at M12.
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Cutting ToolsDrillForm Drill
HSS Counterbore Drill JIS DCBTA
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Counterbore

HSS Counterbore Drill JIS DCBTA

HSS Counterbore Drill JIS DCBTA, a JIS-spec counterbore drill forming the pilot hole and counterbore together - no second setup. Body diameter 6.5~29mm, pilot diameter 3.4~20mm, overall length 60~130mm, available in 14 sizes.

Specifications (14 items)

Part No.StandardDia.Major dia.Flute lengthUsable lengthOverall lengthShank dia.Flutes
AYTWCDCBTAM3_9M33.46.59136062
AYTWCDCBTAM4_10M44.5810186662
AYTWCDCBTAM5_11M55.59.511227682
AYTWCDCBTAM6_12M66.61112258082
AYTWCDCBTAW1/4"_12W1/4"6.91112258082
AYTWCDCBTAW5/16"_14W5/16"8.91414288582
AYTWCDCBTAM8_14M8914142885122
AYTWCDCBTAW3/8"_17W3/8"10.51517309082
AYTWCDCBTAM10_17M101117.5173095122
AYTWCDCBTAM12_22M1214202232102122
AYTWCDCBTAW1/2"_22W1/2"14.7202232102122
AYTWCDCBTAM14_27M1416232735110122
AYTWCDCBTAM16_32M1618263240120122
AYTWCDCBTAM18_37M1820293745130122

Specification Range

Diameter3.4~20mm
Large diameter6.5~29mm
Flute length9~37mm
Effective length13~45mm
Overall length60~130mm
Shank diameter6~12mm

Product Description

HSS Counterbore Drill JIS DCBTA, a JIS-spec counterbore drill forming the pilot hole and counterbore together - no second setup. Body diameter 6.5~29mm, pilot diameter 3.4~20mm, overall length 60~130mm, available in 14 sizes. Works on carbon steel, alloy steel plus aluminum, copper and other non-ferrous metals up to HRC30. Japanese brand, consistent quality. Typical applications: JIS-size counterbores for socket head cap screws (the catalog lists it for drilling socket head screw holes); the pilot hole and the counterbore are drilled in one pass, with no need to pre-drill and then switch to a counterbore cutter. In the same EIKO family: DCB (screws M3~M12 and W1/4"~W1/2") and the JIS countersink drill DCBSTA; DCBTA follows JIS sizes, so for the same metric screw its counterbore diameter is larger than DCB (e.g. M6: body diameter 11mm, DCB 10.4mm), and it extends to M14~M18. Which size for an M10 screw? Choose M10: pilot diameter 11mm, body diameter 17.5mm. Is there anything above M12? Yes, DCBTA goes up to M18, while DCB stops at M12.

Workpiece Materials & Hardness

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

Max. workpiece hardness HRC30

Tags

  • Counterbore

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