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AYTWCDCBHSS Counterbore Drill DCBSold0pcsHSS Counterbore Drill DCB, a step drill that drills the pilot hole and counterbore in one pass, seating cap screws perfectly flush - the standard counterbore drill. Thread sizes M3~M12 and W1/4"~W1/2" (body diameter 5.9~20mm), pilot diameter 3.5~13.5mm, overall length 48~92mm, available in 11 sizes. Works on carbon steel, alloy steel plus aluminum, copper and other non-ferrous metals up to HRC30. Japanese brand, consistent quality. Typical applications: 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: DCBTA (JIS sizes, with a larger counterbore diameter for the same metric screw, extending to M18) and the countersink drill DCBS (for flat-head screws); DCB covers screws M3~M12 and W1/4"~W1/2". If the hole is already drilled and only the counterbore is needed, choose the CB counterbore cutter. Which size for an M8 screw? Choose M8: pilot diameter 8.5mm, body diameter 13.4mm. Is there anything above M12? DCB stops at M12; for M14~M18 see DCBTA.
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HSS Counterbore Drill DCB
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Counterbore

HSS Counterbore Drill DCB

HSS Counterbore Drill DCB, a step drill that drills the pilot hole and counterbore in one pass, seating cap screws perfectly flush - the standard counterbore drill.

Specifications (11 items)

Part No.StandardDia.Major dia.Flute lengthUsable lengthOverall lengthShank dia.Flutes
AYTWCDCBM3_7M33.55.97104862
AYTWCDCBM4_9M44.57.49155562
AYTWCDCBM5_12M55.58.912206462
AYTWCDCBM6_13M66.510.413257082
AYTWCDCBW1/4"_13W1/4"6.851113256982
AYTWCDCBM8_16M88.513.4163078102
AYTWCDCBW5/16"_17W5/16"8.5514173081102
AYTWCDCBW3/8"_18W3/8"10.115183587122
AYTWCDCBM10_20M1010.616.8203587122
AYTWCDCBM12_23M1212.718.8233590122
AYTWCDCBW1/2"_23W1/2"13.520233592122

Specification Range

Diameter3.5~13.5mm
Large diameter5.9~20mm
Flute length7~23mm
Effective length10~35mm
Overall length48~92mm
Shank diameter6~12mm

Product Description

HSS Counterbore Drill DCB, a step drill that drills the pilot hole and counterbore in one pass, seating cap screws perfectly flush - the standard counterbore drill. Thread sizes M3~M12 and W1/4"~W1/2" (body diameter 5.9~20mm), pilot diameter 3.5~13.5mm, overall length 48~92mm, available in 11 sizes. Works on carbon steel, alloy steel plus aluminum, copper and other non-ferrous metals up to HRC30. Japanese brand, consistent quality. Typical applications: 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: DCBTA (JIS sizes, with a larger counterbore diameter for the same metric screw, extending to M18) and the countersink drill DCBS (for flat-head screws); DCB covers screws M3~M12 and W1/4"~W1/2". If the hole is already drilled and only the counterbore is needed, choose the CB counterbore cutter. Which size for an M8 screw? Choose M8: pilot diameter 8.5mm, body diameter 13.4mm. Is there anything above M12? DCB stops at M12; for M14~M18 see DCBTA.

Workpiece Materials & Hardness

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

Max. workpiece hardness HRC30

Tags

  • Counterbore

Related Resources

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