AMC 2026 catalogue

Machining

Drill Bits

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MACHINING

Torus Heavy-Duty Parabolic Flute Jobber Drills

▪135° split point reduces drill walking ▪Parabolic flute design to produce close tolerances

Size (in.) Decimal Equivalent Length (in.) Flute Length (in.) Item No. 1⁄16 0.0625 1 7⁄8 7⁄8 GNF1872-18430 5⁄64 0.0781 2 1 GNF1872-18431 3⁄32 0.0938 2 1⁄4 1 1⁄4 GNF1872-18432 7⁄64 0.1094 2 5⁄8 1 1⁄2 GNF1872-18433 1⁄8 0.125 2 3⁄4 1 5⁄8 GNF1872-18434 9⁄64 0.1406 2 7⁄8 1 3⁄4 GNF1872-18435 5⁄32 0.1563 3 1⁄8 2 GNF1872-18436 11⁄64 0.1719 3 1⁄4 2 1⁄8 GNF1872-18437 3⁄16 0.1875 3 1⁄2 2.9375 GNF1872-18438 13⁄64 0.2031 3 5⁄8 2 7⁄16 GNF1872-18439 7⁄32 0.2188 3 3⁄4 2 1⁄2 GNF1872-18440 15⁄64 0.2344 3 7⁄8 2 5⁄8 GNF1872-18441 1⁄4 0.25 4 2 3⁄4 GNF1872-18442 17⁄64 0.2656 4 1⁄8 2 7⁄8 GNF1872-18443 9⁄32 0.2813 4 1⁄4 2 15⁄16 GNF1872-18444

Size (in.) Decimal Equivalent Length (in.) Flute Length (in.) Item No. 19⁄64 0.2969 4 3⁄8 3 1⁄16 GNF1872-18445 5⁄16 0.3125 4 1⁄2 3 3⁄16 GNF1872-18446 21⁄64 0.3281 4 5⁄8 3 5⁄16 GNF1872-18447 11⁄32 0.3438 4 3⁄4 3 7⁄16 GNF1872-18459 23⁄64 0.3594 4 7⁄8 3 1⁄2 GNF1872-18449 3⁄8 0.375 5 3 5⁄8 GNF1872-18450 25⁄64 0.3906 5 1⁄8 3 3⁄4 GNF1872-18451 13⁄32 0.4063 5 1⁄4 3 7⁄8 GNF1872-18452 27⁄64 0.4219 5 3⁄8 3 15⁄16 GNF1872-18453 7⁄16 0.4375 5 1⁄2 4 1⁄16 GNF1872-18454 29⁄64 0.4531 5 5⁄8 4 3⁄16 GNF1872-18455 15⁄32 0.4688 5 3⁄4 4 5⁄16 GNF1872-18456 31⁄64 0.4844 5 7⁄8 4 3⁄8 GNF1872-18457 1⁄2 0.5 6 4 1⁄2 GNF1872-18458

CLE-LINE

Maintenance Grade Parabolic Jobber Length HSS Drill Bits, 135°

▪Notched point

Drill Bit Size Decimal Equivalent Flute Length Overall Length Item No. Black/Gold

1⁄16 in 0.0625 7⁄8 in 1 7⁄8 in GNF1872-18430 5⁄64 in 0.0781 1 in 2 in GNF1872-18431 3⁄32 in 0.0938 1 1⁄4 in 2 1⁄4 in GNF1872-18432 7⁄64 in 0.1094 1 1⁄2 in 2 5⁄8 in GNF1872-18433 1⁄8 in 0.125 1 5⁄8 in 2 3⁄4 in GNF1872-18434 9⁄64 in 0.1406 1 3⁄4 in 2 7⁄8 in GNF1872-18435 5⁄32 in 0.1563 2 in 3 1⁄8 in GNF1872-18436 11⁄64 in 0.1719 2 1⁄8 in 3 1⁄4 in GNF1872-18437 3⁄16 in 0.1875 2 5⁄16 in 3 1⁄2 in GNF1872-18438 13⁄64 in 0.2031 2 7⁄16 in 3 5⁄8 in GNF1872-18439 7⁄32 in 0.2188 2 1⁄2 in 3 3⁄4 in GNF1872-18440 15⁄64 in 0.2344 2 5⁄8 in 3 7⁄8 in GNF1872-18441 1⁄4 in 0.25 2 3⁄4 in 4 in GNF1872-18442 17⁄64 in 0.2656 2 7⁄8 in 4 1⁄8 in GNF1872-18443

Drill Bit Size Decimal Equivalent Flute Length Overall Length Item No. 9⁄32 in 0.2813 2 15⁄16 in 4 1⁄4 in GNF1872-18444 19⁄64 in 0.2969 3 1⁄16 in 4 3⁄8 in GNF1872-18445 5⁄16 in 0.3125 3 3⁄16 in 4 1⁄2 in GNF1872-18446 21⁄64 in 0.3281 3 5⁄16 in 4 5⁄8 in GNF1872-18447 23⁄64 in 0.3594 3 1⁄2 in 4 7⁄8 in GNF1872-18449 3⁄8 in 0.375 3 5⁄8 in 5 in GNF1872-18450 25⁄64 in 0.3906 3 3⁄4 in 5 1⁄8 in GNF1872-18451 13⁄32 in 0.4063 3 7⁄8 in 5 1⁄4 in GNF1872-18452 27⁄64 in 0.4219 3 15⁄16 in 5 3⁄8 in GNF1872-18453 7⁄16 in 0.4375 4 1⁄16 in 5 1⁄2 in GNF1872-18454 29⁄64 in 0.4531 4 3⁄16 in 5 5⁄8 in GNF1872-18455 15⁄32 in 0.4688 4 5⁄16 in 5 3⁄4 in GNF1872-18456 31⁄64 in 0.4844 4 3⁄8 in 5 7⁄8 in GNF1872-18457 1⁄2 in 0.5 4 1⁄2 in 6 in GNF1872-18458

CLE-LINE

Production Grade Jobbers Length Cobalt Drill Bits, 135°

▪Aircraft maintenance drills ▪Split point ▪List #3780 Drill Bit Size Decimal Equivalent Flute Length Overall Length Item No. Black Oxide

1⁄16 in 0.0625 5⁄8 in 1 7⁄8 in GNF3780-15889 5⁄64 in 0.0781 11⁄16 in 2 in GNF3780-15895 3⁄32 in 0.0938 3⁄4 in 2 1⁄4 in GNF3780-15902 7⁄64 in 0.1094 13⁄16 in 2 5⁄8 in GNF3780-15909 1⁄8 in 0.125 7⁄8 in 2 3⁄4 in GNF3780-15915 9⁄64 in 0.1406 15⁄16 in 2 7⁄8 in GNF3780-15919 5⁄32 in 0.1563 1 in 3 1⁄8 in GNF3780-15925 11⁄64 in 0.1719 1 1⁄16 in 3 1⁄4 in GNF3780-15931 3⁄16 in 0.1875 1 1⁄8 in 3 1⁄2 in GNF3780-15937 13⁄64 in 0.2031 1 3⁄16 in 3 5⁄8 in GNF3780-15944 7⁄32 in 0.2188 1 1⁄4 in 3 3⁄4 in GNF3780-15949 15⁄64 in 0.2344 1 5⁄16 in 3 7⁄8 in GNF3780-15953 1⁄4 in 0.25 1 3⁄8 in 4 in GNF3780-15957 17⁄64 in 0.2656 1 7⁄16 in 4 1⁄8 in GNF3780-15960

Drill Bit Size Decimal Equivalent Flute Length Overall Length Item No. 9⁄32 in 0.2813 1 1⁄2 in 4 1⁄4 in GNF3780-15965 19⁄64 in 0.2969 1 9⁄16 in 4 3⁄8 in GNF3780-15968 5⁄16 in 0.3125 1 9⁄16 in 4 1⁄2 in GNF3780-15970 21⁄64 in 0.3281 1 11⁄16 in 4 5⁄8 in GNF3780-15973 11⁄32 in 0.3438 1 11⁄16 in 4 3⁄4 in GNF3780-15976 23⁄64 in 0.3594 1 3⁄4 in 4 7⁄8 in GNF3780-15979 3⁄8 in 0.375 1 13⁄16 in 5 in GNF3780-15981 25⁄64 in 0.3906 1 7⁄8 in 5 1⁄8 in GNF3780-15984 13⁄32 in 0.4063 1 15⁄16 in 5 1⁄4 in GNF3780-15987 27⁄64 in 0.4219 2 in 5 3⁄8 in GNF3780-15989 7⁄16 in 0.4375 2 1⁄16 in 5 1⁄2 in GNF3780-15990 29⁄64 in 0.4531 2 1⁄8 in 5 5⁄8 in GNF3780-15991 15⁄32 in 0.4688 2 1⁄8 in 5 3⁄4 in GNF3780-15992 31⁄64 in 0.4844 2 3⁄16 in 5 7⁄8 in GNF3780-15993 1⁄2 in 0.5 2 1⁄4 in 6 in GNF3780-15994

CLEVELAND

Short flute length and extra-heavy web for rigid aircraft maintenance applications and a fast 40° helix for chip removal.

Production Grade Jobbers Length Cobalt Drill Bits, 135°

▪Split point List #550 meet/exceed National Aerospace Standards 907, Type J. List #550ASP bits meet/exceed National Aerospace Standards 907, Type B and have a thinner web for hand/portable drilling.

GNF550-46611

Drill Bit Size

Decimal Equivalent

Flute Length

Overall Length

List Number 550 550ASP Item

No.

Item

No. Straw/Bronze

11⁄64 in 0.1719 2 1⁄8 in 3 1⁄4 in GNF550-46611 GNF550ASP47711 13⁄64 in 0.2031 2 7⁄16 in 3 5⁄8 in GNF550-46613 GNF550ASP47713 15⁄64 in 0.2344 2 5⁄8 in 3 7⁄8 in GNF550-46615 GNF550ASP47715 1⁄4 in 0.25 2 3⁄4 in 4 in GNF550-46616 GNF550ASP47716

CHICAGO-LATROBE

▪List #1872 Combination of parabolic flute form and point design produces tighter hole tolerances, increased chip-breaking action, and improved coolant flow for deep-hole drilling.

Wide flute spacing results in tighter, more manageable chips and reduced chip packing.

▪Black and gold finish adds lubricity ▪High speed steel construction

▪Increased penetration

Drill Bit Size

Decimal Equivalent

Flute Length

Overall Length

List Number 550 550ASP Item

No.

Item

No. 17⁄64 in 0.2656 2 7⁄8 in 4 1⁄8 in GNF550-46617 GNF550ASP47717 19⁄64 in 0.2969 3 1⁄16 in 4 3⁄8 in GNF550-46619 GNF550ASP47719 21⁄64 in 0.3281 3 5⁄16 in 4 5⁄8 in GNF550-46621 GNF550ASP47721 11⁄32 in 0.3438 3 7⁄16 in 4 3⁄4 in GNF550-46622 GNF550ASP47722 23⁄64 in 0.3594 3 1⁄2 in 4 7⁄8 in GNF550-46623 GNF550ASP47723 25⁄64 in 0.3906 3 3⁄4 in 5 1⁄8 in GNF550-46625 GNF550ASP47725 13⁄32 in 0.4063 3 7⁄8 in 5 1⁄4 in GNF550-46626 GNF550ASP47726 27⁄64 in 0.4219 3 15⁄16 in 5 3⁄8 in GNF550-46627 GNF550ASP47727 29⁄64 in 0.4531 4 3⁄16 in 5 5⁄8 in GNF550-46629 GNF550ASP47729 15⁄32 in 0.4688 4 5⁄16 in 5 3⁄4 in GNF550-46630 GNF550ASP47730 31⁄64 in 0.4844 4 3⁄8 in 5 7⁄8 in GNF550-46631 GNF550ASP47731