Tap and Drill Gauges | McMaster-Carr

	Material Material

Steel

Plastic

Stainless Steel

	System of Measurement System of Measurement

Inch

Metric

	Media Type Media Type

Chart

Ruler

	For System of Measurement For System of Measurement

	For Use With For Use With

	Thread Size Thread Size

	Length Length

2 1/4"

	For Screw Size For Screw Size

	For Drill Bit Size For Drill Bit Size

	For Thread Type For Thread Type

UNC

UNF

Metric

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Height Height

	Thickness Thickness

	Width Width

	For Diameter For Diameter

	Numeric Increments Numeric Increments

8/64"

1 cm

	Graduation Location Graduation Location

Front

Back

	For Threads per Inch For Threads per Inch

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	For Pipe Fitting Size For Pipe Fitting Size

	For Pipe Size For Pipe Size

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	For Pipe Material For Pipe Material

12 Products

Drill Bit Size Identifiers

Inch

Letter

Metric

Wire Gauge

Measure drill bit sizes with these identifiers.

Drill/tap identifier includes a tap size conversion chart.

For System of Measurement	For Use With	For Drill Bit Size	Wd.	Ht.	Thick.	Material	Color	Mounting Hole Dia.		Each
Inch	Drills	1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2"	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	0000000	000000
Letter	Drills	A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	0000000	00000
Metric	Drills	1.5 mm, 2.0 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3.0 mm, 3.25 mm, 3.5 mm, 3.75 mm, 4.0 mm, 4.25 mm, 4.5 mm, 4.75 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, 10.0 mm, 10.5 mm, 11.0 mm, 11.5 mm, 12.0 mm, 12.5 mm, 5.25 mm	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	0000000	00000
Wire Gauge	Drills	80 ga, 79 ga, 78 ga, 77 ga, 76 ga, 75 ga, 74 ga, 73 ga, 72 ga, 71 ga, 70 ga, 69 ga, 68 ga, 67 ga, 66 ga, 65 ga, 64 ga, 63 ga, 62 ga, 61 ga	1"	3"	5/64"	Steel	Silver	1/8"	0000000	00000
Wire Gauge	Drills/Taps	60 ga, 59 ga, 58 ga, 57 ga, 56 ga, 55 ga, 54 ga, 53 ga, 52 ga, 51 ga, 50 ga, 49 ga, 48 ga, 47 ga, 46 ga, 45 ga, 44 ga, 43 ga, 42 ga, 41 ga, 40 ga, 39 ga, 38 ga, 37 ga, 36 ga, 35 ga, 34 ga, 33 ga, 32 ga, 31 ga, 30 ga, 29 ga, 28 ga, 27 ga, 26 ga, 25 ga, 24 ga, 23 ga, 22 ga, 21 ga, 20 ga, 19 ga, 18 ga, 17 ga, 16 ga, 15 ga, 14 ga, 13 ga, 12 ga, 11 ga, 10 ga, 9 ga, 8 ga, 7 ga, 6 ga, 5 ga, 4 ga, 3 ga, 2 ga, 1 ga	2 1/2"	6 1/2"	5/64"	Steel	Silver	1/8"	0000000	00000

Screw Size Identifiers

Inch

Find thread size, screw size, thread pitch, diameter, or drill bit size.

Inch
For Use With	For Thread Type	For Thread Location	For Thread Size	For Screw Size	For Dia.	For Drill Bit Size	Wd.	Ht.	Thick.		Each
Steel
Screws, Bolts, Threaded Rods, Pins, Rivets, Drill Bits	UNC/UNF	External	1-64, 1-72, 2-56, 2-64, 3-48, 3-56, 4-36, 4-40, 4-48, 5-40, 5-44, 6-32, 6-36, 6-40, 8-32, 8-36, 8-40, 10-24, 10-32, 12-24, 12-28, 12-32, 1/4"-20, 1/4"-28, 1/4"-32, 5/16"-18, 5/16"-24, 5/16"-32	No. 1, No. 2, No. 3, No. 4, No. 5, 1/8", No. 6, 5/32", No. 8, 3/16", No. 10, No. 12, 7/32", 1/4", 9/32", 5/16"	0.073", 0.086", 3/32", 0.112", 1/8", 0.138", 5/32", 0.164", 3/16", 7/32", 1/4", 9/32", 5/16"	7/32", 1/4", 9/32", 5/16", 53 ga, 51 ga, 50 ga, 48 ga, 47 ga, 45 ga, 43 ga, 42 ga, 39 ga, 38 ga, 37 ga, 36 ga, 35 ga, 33 ga, 30 ga, 29 ga, 28 ga, 25 ga, 23 ga, 21 ga, 19 ga, 16 ga, 14 ga, 13 ga, 10 ga, 8 ga, 3 ga, F, I	3"	5 1/8"	5/64"	000000000	000000
Metric
Steel
Screws, Bolts, Threaded Rods	Metric	External	M8 × 0.75 mm, M8 × 1 mm, M8 × 1.25 mm, M9 × 0.75 mm, M9 × 1 mm, M9 × 1.25 mm, M10 × 0.75 mm, M10 × 1 mm, M10 × 1.25 mm, M10 × 1.5 mm, M11 × 0.75 mm, M11 × 1 mm, M11 × 1.5 mm, M12 × 1 mm, M12 × 1.25 mm, M12 × 1.5 mm, M12 × 1.75 mm, M14 × 1.25 mm, M14 × 1.5 mm, M14 × 2 mm	M8, M9, M10, M11, M12, M14	__	__	5 1/8"	5 3/8"	1/8"	000000000	00000
Screws, Bolts, Threaded Rods, Drill Bits	Metric	External	M2 × 0.25 mm, M2 × 0.4 mm, M2.2 × 0.25 mm, M2.2 × 0.45 mm, M2.5 × 0.35 mm, M2.5 × 0.45 mm, M3 × 0.35 mm, M3 × 0.5 mm, M3.5 × 0.35 mm, M3.5 × 0.6 mm, M4 × 0.5 mm, M4 × 0.7 mm, M4.5 × 0.5 mm, M4.5 × 0.75 mm, M5 × 0.5 mm, M5 × 0.8 mm, M5.5 × 0.5 mm, M6 × 0.75 mm, M6 × 1 mm, M7 × 0.75 mm, M7 × 1 mm	M2, M2.2, M2.5, M3, M3.5, M4, M4.5, M5, M5.5, M6, M7	__	7/32", 52 ga, 50 ga, 48 ga, 46 ga, 45 ga, 43 ga, 39 ga, 37 ga, 32 ga, 31 ga, 30 ga, 28 ga, 25 ga, 22 ga, 21 ga, 18 ga, 16 ga, 10 ga, 8 ga, 4 ga, B, D, J	3"	5 3/8"	3/32"	000000000	00000

Threads per Inch and Center Identifiers

Identify threads per inch on external threads and find the center of your workpiece to line up thread-cutting tools. This identifier has a corrosion-resistant satin-chrome finish that reduces glare.

Inch
For Use With	For Thread Type	For Thread Location	For Threads per Inch	Lg.	Wd.	Thick.		Each
Satin-Chrome Steel
Screws, Bolts, Threaded Rods	UNC/UNF	External	14, 20, 24, 32	2 1/4"	3/4"	3/64"	0000000	000000

All-in-One Identifiers

Find tube, pipe, fastener, wire, and drill bit sizes with one tool.

Plastic
For Use With (Number of Sizes)	Wd.	Ht.	Material		Each
Tube (9), Tube Fittings (6), Pipe (9), Pipe Fittings (6), Screws and Bolts (20), Threaded Rods, Nuts (14), Nails (11), Wire (30), Drill Bits (21)	8 11/16"	4 1/4"	Plastic	00000000	00000
Tube (11), Tube Fittings (10), Pipe (16), Pipe Fittings (10), Screws and Bolts (20), Threaded Rods, Nuts (20), Nails (16), Wire (51), Drill Bits (50)	10 1/2"	3 1/2"	Plastic	00000000	0000

Tap and Drill Reference Rulers

One side of this ruler lists tap and drill sizes. The other side has a decimal equivalent table and a 6" rule.

		Graduation
Lg.	Wd.	Marks	Color	Location	Numeric Increments	Material	Features		Each
7"	1 1/4"	64ths	Black	Front	8/64"	Stainless Steel	Tap and Drill Sizes for UNF, UNC, Metric ISO, and American Standard Pipe Thread Sizes Decimal Equivalent Table for 1/64" to 63/64" Hanging Hole	0000000	00000