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AT Combined Drill & Countersinks

AT combined drill countersinks—often called drill countersink bits or combination drill & countersink tools—are designed to streamline hole preparation by drilling a pilot hole and creating a chamfer/countersink in one operation (application dependent). They’re commonly used in fabrication and maintenance work to help reduce tool changes and produce cleaner, more consistent hole edges for fasteners, rivets, and general deburring.

Alfa Tools CDH50451 ASA # 1 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDH50451 ASA # 1 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDH50451
MPN: CDH50451

Save $2.82
Alfa Tools CDH50452 ASA # 2 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDH50452 ASA # 2 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDH50452
MPN: CDH50452

Save $2.82
Alfa Tools CDH50453 ASA # 3 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDH50453 ASA # 3 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDH50453
MPN: CDH50453

Save $2.82
Alfa Tools CDH50454 ASA # 4 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDH50454 ASA # 4 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDH50454
MPN: CDH50454

Save $2.82
Alfa Tools CDH50455 ASA # 5 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

Alfa Tools CDH50455 ASA # 5 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

SKU: AT-CDH50455
MPN: CDH50455

Save $6.37
Alfa Tools CDH50456 ASA # 6 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

Alfa Tools CDH50456 ASA # 6 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

SKU: AT-CDH50456
MPN: CDH50456

Save $9.69
Alfa Tools CDH50457 ASA # 7 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

Alfa Tools CDH50457 ASA # 7 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

SKU: AT-CDH50457
MPN: CDH50457

Save $16.67
Alfa Tools CDH50458 ASA # 8 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

Alfa Tools CDH50458 ASA # 8 HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

SKU: AT-CDH50458
MPN: CDH50458

Save $17.79
Alfa Tools CDHK50448 #000 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50448 #000 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50448
MPN: CDHK50448

Save $11.71
Alfa Tools CDHK50449 #00 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50449 #00 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50449
MPN: CDHK50449

Save $11.71
Alfa Tools CDHK50450 #0 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50450 #0 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50450
MPN: CDHK50450

Save $11.71
Alfa Tools CDHK50451 #1 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50451 #1 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50451
MPN: CDHK50451

Save $8.18
Alfa Tools CDHK50452 #2 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50452 #2 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50452
MPN: CDHK50452

Save $8.51
Alfa Tools CDHK50453 #3 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50453 #3 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50453
MPN: CDHK50453

Save $8.90
Alfa Tools CDHK50454 #4 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDHK50454 #4 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDHK50454
MPN: CDHK50454

Save $9.14
Alfa Tools CDHK50455 #5 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

Alfa Tools CDHK50455 #5 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

SKU: AT-CDHK50455
MPN: CDHK50455

Save $14.49
Alfa Tools CDHK50456 #6 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

Alfa Tools CDHK50456 #6 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 6

SKU: AT-CDHK50456
MPN: CDHK50456

Save $21.78
Alfa Tools CDHK50457 #7 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

Alfa Tools CDHK50457 #7 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

SKU: AT-CDHK50457
MPN: CDHK50457

Save $33.12
Alfa Tools CDHK50458 #8 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

Alfa Tools CDHK50458 #8 HSS USA COMBINED DRILL & COUNTERSINK - Std Qty Pack 3

SKU: AT-CDHK50458
MPN: CDHK50458

Save $45.46
Alfa Tools Drilling & Metal Cutting Tools cdhk50465

Alfa Tools CDHK50465 5PC HSS COMBINED DRILL & COUNTERSINK SET USA

SKU: AT-CDHK50465
MPN: CDHK50465

Save $74.34
Alfa Tools CDK50471 ASA# 1X3 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDK50471 ASA# 1X3 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDK50471
MPN: CDK50471

Save $19.95
Alfa Tools CDK50472 ASA# 1X4 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDK50472 ASA# 1X4 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDK50472
MPN: CDK50472

Save $20.83
Alfa Tools CDK50473 ASA# 2X4 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDK50473 ASA# 2X4 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDK50473
MPN: CDK50473

Save $22.79
Alfa Tools CDK50474 ASA# 2X5 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

Alfa Tools CDK50474 ASA# 2X5 ALFA USA HSS COMBINED DRILL & COUNTERSINK - Std Qty Pack 12

SKU: AT-CDK50474
MPN: CDK50474

Save $29.22