Pipe Size Identifiers | McMaster-Carr

	For Use With For Use With

Bolts

Drill Bits

Hose

	For System of Measurement For System of Measurement

Pipe Size

Inch

Metric

	For Thread Type For Thread Type

	For Pipe Size For Pipe Size

1/16
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
5/16
5/8
7/8
1 1/8
1 3/8

	Material Material

	For Thread Location For Thread Location

External

Internal

	Width Width

	Length Length

30"

60"

120"

	For Gender For Gender

Female

Male

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

DFARS Specialty Metals
COTS-Exempt

	For Pipe Fitting Size For Pipe Fitting Size

	Thread Type Thread Type

BSPT

NPT

	For Drill Bit Size For Drill Bit Size

	For Screw Size For Screw Size

	For Tube Fitting Material For Tube Fitting Material

Copper

Plastic

	Graduation Marks Graduation Marks

	Color Color

	Blue		Gray
	Silver		White

	For Pipe Material For Pipe Material

	Thickness Thickness

	Height Height

	For Tube OD For Tube OD

	For Nut Size For Nut Size

	Number of Pieces Number of Pieces

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Pipe Thread and Thread Pitch Identifiers

In addition to checking NPT and BSPT pipe sizes, use the two included gauges for measuring thread pitch.

For Thread Type	For Pipe Size	For Gender	Wd.	Ht.	Thick.	Thread Size Identifier Material	Thread Pitch Identifier Material	Color		Each
BSPT, NPT	1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2	Female, Male	9"	4 1/4"	1/4"	Plastic	Steel	Blue	000000	00000

Pipe Thread Identifiers

Check external NPT thread size and taper.

Aluminum
For Thread Type	For Thread Location	For Pipe Size	Wd.	Ht.	Thick.	Color		Each
NPT	External	1/16, 1/8, 1/4, 3/8, 1/2	2"	3"	1/4"	Blue	000000	000000

Pipe, Tubing, and Hose Size Identifiers

For Pipe, Tubing, And Hose

For Pipe, Pipe Fittings, And Hose

Determine pipe size and inner and outer diameter.

Pipe, pipe fittings, and hose identifier is stainless steel for corrosion resistance.

Plastic
For Use With	For Pipe Size	For Pipe Fitting Size	For Tube OD	For Hose ID	Includes	Wd.	Ht.	Thick.	Color		Each
Pipe, Tubing, Hose	1/8, 1/4, 3/8, 1/2, 3/4	__	1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 1"	1/4", 3/8", 1/2", 3/4", 1"	Compression Fitting Chart	9"	3 3/4"	7/64"	Blue	0000000	00000
Stainless Steel
Pipe, Pipe Fittings, Hose	1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2	1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2	__	1/8", 1/4", 5/16", 3/8", 5/8", 3/4", 7/8", 1", 1 1/8", 1 1/4"	__	3 3/4"	4 1/2"	1/32"	Silver	00000000	00000

Pipe Size Rulers

Measure outer diameter and mark lines around pipe. A pipe size conversion chart is printed on these rulers. They’re fiber-reinforced rubber for grease, oil, gasoline, and salt water resistance.

For Pipe OD
Inch	Metric	Lg.	Wd.	Thick.	Measuring Lg.	Front Graduation Marks (Numeric Increments)	Color	Graduation Color	Max. Temp.		Each
Rubber
1"-6"	2 mm-60 cm	30"	2 5/8"	3/64"	28"	2 mm (1 cm), 16ths (1")	Gray	White	360° F	0000000	000000
2"-16"	2 mm-78 cm	60"	3 7/8"	3/64"	36"	2 mm (1 cm), 16ths (1")	Gray	White	360° F	0000000	00000
6"-30"	2 mm-77 cm	120"	5 1/4"	3/64"	36"	2 mm (1 cm), 16ths (1")	Gray	White	360° F	0000000	00000

Pipe Size Tape Measures

Wrap these pocket-size tape measures around pipe and fittings to determine size. The blade locks in place and retracts with the push of a button.

Plastic
For Galvanized Steel, Iron, and PVC Pipe Size	For Copper and CPVC Pipe Size	Wd.	Thick.	Color	Graduation Color		Each
1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2, 2 1/2, 3, 3 1/2, 4, 5, 6, 8, 10, 12, 14, 16, 18	3/16, 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1 1/8, 1 1/4, 1 3/8, 1 1/2, 2, 2 1/2, 3, 3 1/2, 4, 5, 6, 8, 10, 12	5/16"	1/64"	White	Red	0000000	000000

Thread Identifier Sets

Set includes calipers and gauges to identify external and internal threads.

			Container
For Use With	For Thread Type	For Thread Location	Type	Material	Includes		Each
Inch, Metric, Pipe Size
Steel
Screws, Bolts, Threaded Rods, Nuts, Pipe	NPT, UNC, UNF, BSPT, BSPP, Metric	External/Internal	Folding Case	Plastic	Caliper, Instruction Book, Two Steel Angle Gauges, Two Steel Gauges	000000	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

Pipe Size Measuring Kits

Kits contain pipe fittings in a variety of sizes so you can determine the size of a pipe or fitting without measuring.

NPT Thread
No. of Pieces	Includes	Material		Each
6	One 90° male × female elbow in each pipe size: 1/8, 1/4, 3/8, 1/2, 3/4, 1	304 Stainless Steel	000000	000000
9	One 90° male × female elbow in each pipe size: 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2	304 Stainless Steel	000000	00000
BSPT Thread
6	One 90° male × female elbow in each pipe size: 1/8, 1/4, 3/8, 1/2, 3/4, 1	304 Stainless Steel	000000	00000
9	One 90° male × female elbow in each pipe size: 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2	304 Stainless Steel	000000	00000