21 ga Drill Bits | McMaster-Carr

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System of Measurement

Drill Bit Size

0.35 mm to 2.5 mm (Increments of 0.05 mm)

1", 1 1/32", 1 1/16", 1 1/8", 1 5/32", 1 3/16", 1 1/4", 1 5/16", 1 3/8", 1 7/16", 1 1/2"

1.0 mm to 10.0 mm (Increments of 0.5 mm)

1.0 mm to 13.0 mm (Increments of 0.5 mm)

1.0 mm to 5.9 mm (Increments of 0.1 mm)

1.0 mm to 6.9 mm (Increments of 0.1 mm)

1.0 mm to 7.0 mm (Increments of 0.5 mm)

1/16" to 1/2" (Increments of 1/64")

1/16" to 1/2" (increments of 1/32")

1/16" to 1/4" (Increments of 1/64")

1/16" to 3/8" (Increments of 1/64")

1/2" to 1" (Increments of 1/64")

1/64" to 1/4" (increments of 1/64")

2.6 mm to 10.0 mm (Increments of 0.1 mm)

6.0 mm to 10.0 mm (Increments of 0.1 mm)

9/16" to 1" (increments of 1/16")

33/64" to 63/64" (Increments of 1/64")

For Use On

Length Class

Decimal Size Equivalent

0.159"

Finish

Black Oxide

Carbide Tipped

Titanium Aluminum Nitride (TiAlN) Coated

Titanium Nitride (TiN) Coated

Drill Bit Point Type

Shank Size

Thread Size

Material

Shank Type

Point Angle

Number of Flutes

Overall Length

Flute Direction

Flute Type

Sold As

Maximum Drilling Depth

Number of Pieces

For Drill Bit Size Decimal Equivalent

Bit Style

Specifications Met

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Not Compliant

DFARS Specialty Metals

REACH

52 Products

Fabricating and Machining

Drill Bits

Create holes in metal, wood, plastic, concrete, and more

41 products

Drill Bit Guides

Drill precise holes without building a fixture

1 product

Drill Taps

Drill and thread holes with the same bit

4 products

Drill Stops

Limit how far bits can drill to create identical hole depths every time

1 product

Drill Bit Extensions

Expand the reach of drill bits to get into deep and hard-to-reach spots

2 products

Tap and Drill Bit Sets

Drill holes and cut internal threads in a variety of sizes

1 product

Containers, Storage, and Furniture

Tap and Drill Bit Stands

Organize taps and drill bits by size

1 product

Raw Materials

Steel

Strong, machinable, and weldable—all with material certificates for traceability

1 product