McMaster-Carr

	Black
	Red
	White
	Orange
	Blue
	Off-White
	Clear
	Pink
	Dark Gray
	Brown
	Green
	Semi-Clear
	Yellow
	Gray
	Beige
	Light Gray
	Dark Blue
	Dark Brown
	Dark Green
	Dark Red
	Light Brown
	Olive
	Purple
	Silver
	Tan

	Type Type


Plug	Cap

Adapter	Connector

Flange

	Profile Profile


Straight	Tapered

	Head Diameter Head Diameter

	Shape Shape

	For OD For OD

0.053" to 0.12"

1/16" to 1/8"

0.079" to 0.15"

0.111" to 0.177"

1/8" to 3/16"

3/16" to 1/4"

3/16" to 1/2"

0.205" to 0.273"

0.235" to 0.302"

1/4" to 5/16"

1/4" to 1/2"

0.298" to 0.365"

5/16" to 3/8"

0.327" to 0.394"

0.356" to 0.422"

3/8" to 7/16"

3/8" to 7/8"

3/8" to 1"

0.385" to 0.451"

0.409" to 0.485"

0.468" to 0.545"

0.487" to 0.568"

1/2" to 9/16"

0.518" to 0.605"

0.613" to 0.693"

5/8" to 11/16"

21/32" to 1 3/8"

0.663" to 0.761"

0.687" to 0.785"

0.74" to 0.849"

3/4" to 13/16"

0.753" to 0.868"

7/8" to 15/16"

7/8" to 1 3/8"

7/8" to 2 1/4"

0.893"

0.901" to 1.027"

0.933" to 1.083"

1" to 1 1/16"

1 1/32" to 2 5/32"

1.085" to 1.358"

1.169" to 1.437"

1.173" to 1.298"

1.249" to 1.402"

1 1/4" to 1 5/16"

1.282" to 1.445"

1 7/16" to 2 15/16"

1.498" to 1.62"

1 1/2" to 1 9/16"

1 1/2" to 5"

1 1/2" to 8"

1.568" to 1.688"

1.688" to 1.818"

1.718" to 1.888"

1 3/4"

1 3/4" to 1 13/16"

1.781" to 1.938"

1.837" to 2.013"

1.841"

1 7/8"

1 29/32"

1.953" to 2.085"

2" to 2 1/16"

2.063" to 2.377"

2.074" to 2 1/4"

2.235" to 2.401"

2 1/4"

2 1/4" to 2 5/16"

2 1/4" to 11"

2.313"

2.333" to 2.54"

2 3/8"

2.395" to 2.688"

2 1/2"

2 1/2" to 2 9/16"

2.579" to 2.728"

2.656" to 2.926"

2.685" to 2.947"

2 3/4"

2 3/4" to 2 13/16"

2.787" to 2.918"

2.792"

2 7/8"

2 7/8" to 16"

2.912" to 3.175"

3" to 3 1/16"

3.02" to 3.3"

3.2" to 3.492"

3 1/4"

3 1/4" to 3 5/16"

3.41" to 3.54"

3.411"

3.48" to 3.66"

3 1/2"

3 1/2" to 3 9/16"

3 5/8"

3 5/8" to 3 13/16"

3 5/8" to 17"

3.71" to 3.84"

3.86" to 4"

3.94" to 4.07"

4" to 4 1/16"

4 1/8"

4.29" to 4.54"

4.37" to 4.62"

4 3/8" to 24"

4.412"

4 1/2"

4.92" to 5.1"

5.21" to 5.37"

5.49" to 5.67"

5 1/2"

5 9/16"

5.92" to 6.1"

6 3/16"

6.33" to 6.49"

6.53" to 6.63"

8.67" to 8.73"

4 to 5 mm

5 to 6 mm

6 to 7 mm

8 mm

8 to 9 mm

9 to 10 mm

10 mm

10 to 11 mm

11 to 12 mm

12 mm

12 to 13 mm

13 to 15 mm

14 mm

14 to 16 mm

15 to 17 mm

16 mm

16 to 18 mm

17 to 19 mm

18 to 20 mm

20 to 22 mm

24 to 26 mm

	For Outside Width For Outside Width

	Height Height

	Cap Type Cap Type


Push On	Screw On

Stretchable	Shrink Fit

Snap On	Adhesive Back

	Connection Style Connection Style

	Inside Height Inside Height

	For Surface Type For Surface Type

Unthreaded

Threaded

	For Use With For Use With

	Pipe Size 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
4
5
6
8
10
12

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3,777 Products

Caps and Plugs

Plugs

Caps

Pipe, Tubing, Hose, and Fittings

Tubing and Tube Fittings

Pipe and Pipe Fittings

Connect pipe to pipe in low- to high-pressure applications. Pipe and fittings are measured by pipe size, which is an industry designation, not an actual measured size like hose, tubing, and duct. Pipe is typically rigid.

Hose and Hose Fittings

Other Tube Plugs

Tube Plugs for Heat Exchangers

Plug leaky internal tubes in heat exchangers with these two-piece ring and pin sets.

Expansion Plugs

Often used when testing systems for leaks, these plugs expand against the inside of pipes to create a pressure-resistant seal.

Pressure-Relief Valves
for Air and Inert Gas

A bubble-tight seal prevents leakage to securely contain air and inert gas under normal pressure conditions.

Breather Vents

Protect against excess vacuum and pressure in cylinders, gear boxes, enclosures, manifolds, and tanks.

Grease and Oil Fittings

Inject lubricant into motors, bearings, engine blocks, and all kinds of machinery.

Grease-Filled Tubing

Donâ€™t wait for grease to travel through a new service lineâ€”install this grease-filled tubing between the pump and a lubrication point to begin lubricating immediately.