McMaster-Carr

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

	Inside Height Inside Height

	For Surface Type For Surface Type

Unthreaded

Threaded

	Flexibility Flexibility

Flexible

Rigid

	Height Height

	Maximum Temperature Maximum Temperature

	Head Diameter Head Diameter

	Head Width Head Width

	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
20

	For Outside Width For Outside Width

	For Connection Type For Connection Type

	For Inside Width For Inside Width

0.34"-0.43"

0.37"-0.4"

0.46"-0.55"

0.584"-0.68"

0.59"-0.68"

0.6"-0.67"

0.62"

0.709"-0.805"

0.71"-0.8"

0.72"-0.84"

0.73"-0.83"

0.76"

0.83"

0.83"-0.93"

0.84"-0.93"

0.84"-0.95"

0.85"-0.92"

0.96"-1.05"

1.02"-1.1"

1.02"-1.13"

1.08"

1.08"-1.18"

1.1"-1.17"

1.11"-1.2"

1.12"

1.17"

1.21"-1.3"

1.23"-1.33"

1.24"-1.33"

1.26"

1.29"-1.34"

1.29"-1.37"

1.33"

1.33"-1.43"

1.35"-1.42"

1.37"

1.42"-1.5"

1.49"-1.58"

1.59"-1.68"

1.73"

1.73"-1.83"

1.74"-1.83"

1.76"

1.83"

1.84"-1.93"

1.85"-1.92"

1.87"

1.99"-2.08"

2.09"-2.23"

2.24"-2.33"

2.37"-2.45"

2.42"-2.58"

2.49"-2.64"

2 1/2"

2.59"-2.68"

2.6"-2.67"

2.76"-2.84"

3.15"-3.26"

3.33"-3.43"

3.44"-3.62"

3 1/2"

3.52"-3.76"

3.78"-3.86"

4.34"-4.51"

4.48"-4.73"

4 1/2"

5.48"-5.73"

5 1/2"

	For Panel Thickness For Panel Thickness

0.016"-0.062"

0.016"-0.063"

0.016"-0.125"

0.016"-0.25"

0.02"-0.07"

0.02"-0.18"

0.03"-0.08"

0.03"-0.11"

0.031"-0.072"

0.031"-0.094"

0.031"-0.109"

0.031"-0.14"

0.031"-0.171"

0.05"-0.1"

0.05"-0.11"

0.059"-0.08"

0.06"-0.08"

0.06"-0.11"

0.062"-0.093"

1/16"

0.063"-0.25"

0.07"-0.13"

0.109"-0.125"

0.109"-0.172"

0.125"-0.156"

0.5-1 mm

0.5-1.5 mm

0.8-1.6 mm

0.8-2 mm

0.8-2.5 mm

0.8-3.5 mm

0.8-4 mm

	Trade Size Trade Size

0000
000
00
0
1
2
3
4
5
5 1/2
6
6 1/2
7
7 1/2
8
8 1/2
9
9 1/2
10
10 1/2
11
11 1/2
12
13
13 1/2
14
15
16
17
18
19
20
21
22
23
24
25
26
28
30
32
34
36
38
40
42
44
46
A
B
C
D

	Hardness Hardness

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1,890 Products

Masking Covers

Tapered Plugs

Often used as laboratory stoppers, these rubber plugs have good impact and abrasion resistance. They’re tapered to fit a range of hole diameters.

Hollow Tapered Plugs

The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes of varying diameters.

Hollow Tapered Plug Assortments

Keep hollow tapered plugs of various sizes on hand to solve whatever problems arise. The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes of varying diameters.

Corks

Lightweight and moisture resistant, these plugs are laboratory-grade 100% natural cork. They’re tapered to fit a range of hole diameters.

Expandable Tapered Plugs

Place a plug into an opening and tighten the wing nut—the sides expand to create a seal in holes of varying diameters.

Pull-Ring Tapered Plugs

Pull the two built-in rings to quickly remove these plugs. All are tapered to fit a range of hole diameters.

Miniature Tapered Plugs

Sized to fit small openings, these tiny plugs fit snugly but can be removed easily using the flange. Their tapered design fits a range of hole diameters.

Tamper-Evident Tapered Plugs

Often used on gas cylinders, these plugs cinch and lock tightly around valve heads to block the ports—they must be cut off making it clear if the cylinder has been tampered with. The plugs are tapered to fit a range of hole diameters.

High-Temperature Tapered Plugs

Good for electroplating, paint baking, and powder-coating applications, these plugs withstand temperatures up to 570° F. All are tapered to fit a range of hole diameters.

Expandable High-Temperature
Tapered Plugs

Place a plug into an opening and tighten the wing nut—the sides expand to create a seal in holes of varying diameters. Good for paint baking and powder-coating applications, these plugs withstand temperatures up to 450° F.

Hollow High-Temperature
Tapered Plugs

The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes of varying diameters. Good for electroplating, paint baking, and powder-coating applications, they withstand temperatures up to 450° F.

Miniature High-Temperature
Tapered Plugs

Sized to fit small openings, these tiny plugs fit snugly but can be removed easily using the flange. They withstand temperatures up to 470° F, which makes them good for electroplating, paint baking, and powder-coating applications. All are tapered to fit a range of hole diameters.

Chemical-Resistant Tapered Plugs

These plugs have excellent chemical resistance for masking parts during chemical finishing applications such as plating and anodizing. Their tapered design fits a range of hole diameters.

Food-Grade Tapered Plugs

Made of FDA listed materials, these plugs are suitable for food contact. They're tapered to fit a range of hole diameters.

Chemical-Resistant
Pull-Through Round Plugs

These plugs have excellent chemical resistance for masking parts during chemical finishing applications such as plating and anodizing. Use the smaller end of the plug to pull the larger end into a through hole to form a tight seal.

High-Temperature
Pull-Through Round Plugs

Good for electroplating, paint baking, and powder-coating applications, these plugs withstand temperatures up to 600° F. To form a tight seal, use the smaller end of the plug to pull the larger end into a through hole.

Flanged Pull-Through Round Plugs

Designed with a flange, these plugs protect countersunk holes during anodizing, electroplating, paint baking, and powder-coating applications. All withstand temperatures up to 600° F. Use the smaller end of the plug to pull the larger end into a through hole to form a tight seal.

Miniature Pull-Through Round Plugs

Also known as mouse tails, these tiny plugs fit hole IDs as small as 0.025". They're commonly used for masking parts during finishing applications. Use the end of the plug to pull it into a through hole to form a tight seal.

Threaded Round Plugs
for Straight-Thread Pipe

Seal tube and hose fittings to keep their straight threads protected from contaminants during fabrication and storage.

Threaded Round Plugs for NPT Pipe

Protect internally threaded NPT connections from contaminants during fabrication and storage.

High-Temperature Round
Plugs for NPT Pipe

These plugs withstand temperatures up to 600° F to protect internally threaded NPT connections from contaminants during electropainting, paint baking, and powder coating applications.

Threaded Round Plugs
for 37° Flared Tube

Designed to fit into 37° flared connections such as those found on JIC and SAE fittings, these plugs protect internally threaded connections from contaminants during fabrication and storage.

Threaded Round Plugs for BSPT Pipe

Safeguard internally threaded BSPT connections from contaminants during fabrication and storage.

Snap-In Round Plugs

Flexible ridges or straps hold these plugs in place and allow them to fit a range of hole diameters.

Round Plugs

The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes.

Sealing Plugs

With a compressible flanged top, these plugs are designed to seal the ends of copper tubing often used in water supply lines, refrigerant lines, and HVAC compressors. All are sized to fit standard copper tube dimensions.

Conductive Round Plugs

With a surface resistivity of less than 10⁵ ohms, these plugs not only dissipate electrical charges, but can be used as an electrical shield.

Antistatic Round Plugs

Keep equipment safe from electrical currents with these plugs that have a surface resistivity of less than 10¹² ohms.

Pull-Tab Round Plugs

A time-saving alternative to threaded plugs, these plugs press in place and have an ergonomic pull tab for quick and easy removal. Use them to temporarily protect holes in objects from contaminants during storage, painting, and light fabrication.

Snap-In Square Plugs

Flexible ridges or straps hold these plugs in place.

Push-In Square Plugs

Push these plugs into an opening and friction holds them in place.

Domed Square Plugs

Often used on metal furniture, these plugs provide a finished look on posts and tubes. Snap them into place and their flexible ridges will provide a secure grip.

Metal Square Plugs

More durable than plastic plugs, these provide the most protection from abrasion and impact. Use them to eliminate sharp edges and create a finished look on metal fence and machine-guard posts. Drive them in place with a hammer for a secure fit.

Snap-In Rectangular Plugs

Flexible ridges securely hold these plugs in place and allow them to fit a range of hole sizes.

Push-In Rectangular Plugs

Push these plugs into an opening and friction holds them in place.

Plastic Snap-In Panel Plugs

Tapered prongs or a snap-in ring securely hold these plugs in place.

Metal Snap-In Panel Plugs

Made of steel, these are our most durable plugs for panels. Tapered prongs snap into the hole to securely hold them in place.

Vented Snap-In Panel Plugs

Vents in the top allow air circulation and permit heat and fumes to escape. These plugs have tapered prongs that snap into the hole to securely hold them in place.

Locking Panel Plugs

The wings on these plugs expand against the sides of a hole to lock them in place.

Clear Locking Panel Plugs

These plugs are see-through to provide visibility and light transmission. They have wings that expand against the sides of the hole to lock them in place.

Vented Locking Panel Plugs

Vents in the top allow air circulation and permit heat and fumes to escape. All of these plugs have wings that expand against the sides of the hole to lock them in place.

Push-In Panel Plugs

Push these plugs into place for a finished appearance on both sides of a panel.

Sealing Panel Plugs

The wings on these plugs expand against the sides of a hole to form a liquid-tight seal. Pierce the plugs with round wire, cable, or tubing and they function as a grommet to create insulated holes.

Expansion Plugs for Castings

Also known as freeze plugs, these are commonly used to permanently seal the shallow holes left in a component during the casting process.

Hydraulic Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components.

Ethernet Port Plugs

Shield unused RJ45 type ports on computers and other electronic equipment from debris and moisture.

Fixture Plate Chip Plugs

Keep chips and shavings from clogging or damaging unused holes on fixture plates in milling machines.

Round Caps

Slide these flexible vinyl caps on and they conform for a snug fit.

Metal Round Caps

More durable than plastic caps, these provide the most protection from abrasion and impact.

Heavy Duty Round Caps

Made of rigid plastic, these caps are more wear resistant than vinyl caps but not as flexible.

Domed Round Caps

The large domed head extends beyond the diameter of your pipe, rod, or tubing for added protection.

Hanging Round Caps

Slide these caps over a tool handle or other round object and use the eye to hang it.

Tethered Round Caps

The tethered design allows frequent access to the ends of pipe, tubing, and other round objects without ever misplacing the cap.

Sure-Grip Round Caps

A long, textured pull tab provides a sure grip for quick removal even when wearing gloves.

Roll-Resistant Round Caps

Commonly used on shipping tubes, these caps have a square head to prevent round objects from rolling during shipping and storage.

High-Temperature Round Caps

Good for electroplating, paint baking, and powder-coating applications, these caps withstand temperatures up to 440° F or 570° F.

Chemical-Resistant Round Caps

These caps have excellent chemical resistance for masking parts during chemical finishing applications such as plating and anodizing.

Food-Grade Round Caps

Made of FDA listed materials, these caps are suitable for food contact.

Conductive Round Caps

With a surface resistivity of less than 10⁵ ohms, these caps not only dissipate electrical charges, but can be used as an electrical shield.

Antistatic Round Caps

Keep equipment safe from electrical currents with these caps that have a surface resistivity of less than 10¹² ohms.

Tapered Caps

These flexible plastic caps are tapered to fit a variety of unthreaded and threaded objects.

High-Temperature Tapered Caps

Made of silicone, these caps withstand temperatures of 450° F for electroplating, paint-baking, and powder-coating applications. All of these flexible caps are tapered to fit a variety of unthreaded and threaded objects.

Tapered Cap Assortments

Keep tapered caps of various sizes on hand to solve whatever problems arise. These flexible plastic caps are tapered to fit a variety of unthreaded and threaded objects.

Square Caps

Slide these flexible vinyl caps on and they conform for a snug fit.

Heavy Duty Square Caps

Made of rigid plastic, these caps are more wear resistant than vinyl caps but not as flexible.

Rectangular Caps

Slide these flexible vinyl caps onto rectangular objects and they conform for a snug fit.

Angle Caps

Place these flexible vinyl caps over the ends of your angle iron and they conform for a snug fit.

Heavy Duty Angle Caps

Made of rigid plastic, these caps provide more wear resistance to the ends of angle iron than vinyl caps but are not as flexible.

Corner Caps

Guard the corners of fragile materials such as glass and mirrors.

Threaded Caps

Protect externally threaded components from contaminants during fabrication and storage.

High-Visibility Pull-Tab Caps

A vibrant yellow color makes these caps stand out. They are made of flexible rubber that conforms for a snug fit. Pull the tab for easy removal.

Flexible Pull-Tab Caps

Slide these flexible vinyl caps on and they conform for a snug fit. Pull the tab for easy removal.

Rigid Pull-Tab Caps

Made of rigid plastic, these caps are more wear resistant than vinyl and rubber caps but not as flexible. Pull the tab for easy removal.

Tear-Tab Caps

Push these caps onto pipe and fittings, then tear their tab to break the seal for easy removal.

Propane Tank Tear-Tab Caps

Designed for propane tanks such as those on forklifts and grills, these caps protect tank valves during storage and transit. Push the caps onto the valves, then tear their tab to break the seal for easy removal.

Squeeze Top Caps

Squeeze the dome top to remove these caps. They're commonly used as thread protectors.

Stretchable Sealing Caps

Unroll these caps onto the tips of cartridges, spouts, and bottles for an airtight seal.

Stretchable Elastic Caps

Similar to a shower cap, these caps have an elastic band that allows them to stretch and cover a variety of shapes in a range of sizes.

Heat-Shrink Round Caps

Permanently seal pipe, tubing, conduit, and even crimped electrical connections. Slide these flexible caps on and use a heat gun to tightly shrink them to the shape of whatever they are covering. Their outer surface shrinks while the inner wall flows into voids to create a sealed connection.

Threaded Standoff Caps

Give open-ended standoffs a finished look and protect them from dirt and debris.

Hex Nut Caps

Sized to fit hex nuts, these caps snap on for a tight hold and provide protection from corrosion.

Screw Caps

Conceal and protect the tops of socket head or button head screws.

Snap-On Fastener Caps

To conceal and protect the entire screw head, insert your screw through the hole in the base and snap on the top.

Hinged Fastener Caps

A one-piece hinged design allows frequent access to screw heads without misplacing the top. To conceal and protect the entire screw head, insert your screw through the hole in the base and flip the hinged top over.

Adhesive-Back Flange Caps

Stick these caps on the raised surfaces of flanges or other flat surfaces for extra protection during transport and storage.

Stretchable Flange Caps

Stretch these caps over flared edges such as flanged tubing and valve handles.

Flange Caps

Snap these caps into flange bolt holes to safeguard pipe flanges during shipping, storing, and finishing applications. They all have a thick center pad to protect the flange opening and pipe threads from damage.

Stacking Caps and Targets

Weld these caps and targets to the ends of posts to create stackable shelving and racking systems.

Bearing Caps

Cover bearings with a two- or four-bolt flange to protect personnel from injury and keep contaminants out.

Rebar Caps

Keep personnel safe from protruding rebar and pipe. Made of rigid plastic, these durable safety caps are bright orange or yellow for excellent visibility.

Capacitor Caps

Also known as capacitor boots, these caps protect capacitors and wire connections from damage to extend their service life. They also insulate wire terminal connections to help reduce accidental shocks.

USB Caps

Shield USB connectors from damage, contaminants, and moisture when they are not being used.

DIN Rail Caps

Guard the edges of DIN rail from damage and create a finished look.

Terms and Conditions and Privacy Policy

Masking Covers

Tapered Plugs

Hollow Tapered Plugs

Hollow Tapered Plug Assortments

Corks

Expandable Tapered Plugs

Pull-Ring Tapered Plugs

Miniature Tapered Plugs

Tamper-Evident Tapered Plugs

High-Temperature Tapered Plugs

Expandable High-TemperatureTapered Plugs

Hollow High-TemperatureTapered Plugs

Miniature High-TemperatureTapered Plugs

Chemical-Resistant Tapered Plugs

Food-Grade Tapered Plugs

Chemical-ResistantPull-Through Round Plugs

High-TemperaturePull-Through Round Plugs

Flanged Pull-Through Round Plugs

Miniature Pull-Through Round Plugs

Threaded Round Plugsfor Straight-Thread Pipe

Threaded Round Plugs for NPT Pipe

High-Temperature RoundPlugs for NPT Pipe

Threaded Round Plugsfor 37° Flared Tube

Threaded Round Plugs for BSPT Pipe

Snap-In Round Plugs

Round Plugs

Sealing Plugs

Conductive Round Plugs

Antistatic Round Plugs

Pull-Tab Round Plugs

Snap-In Square Plugs

Push-In Square Plugs

Domed Square Plugs

Metal Square Plugs

Snap-In Rectangular Plugs

Push-In Rectangular Plugs

Plastic Snap-In Panel Plugs

Metal Snap-In Panel Plugs

Vented Snap-In Panel Plugs

Locking Panel Plugs

Clear Locking Panel Plugs

Vented Locking Panel Plugs

Push-In Panel Plugs

Sealing Panel Plugs

Expansion Plugs for Castings

Hydraulic Sealing Plugs

Ethernet Port Plugs

Fixture Plate Chip Plugs

Round Caps

Metal Round Caps

Heavy Duty Round Caps

Domed Round Caps

Hanging Round Caps

Tethered Round Caps

Sure-Grip Round Caps

Roll-Resistant Round Caps

High-Temperature Round Caps

Chemical-Resistant Round Caps

Food-Grade Round Caps

Conductive Round Caps

Antistatic Round Caps

Tapered Caps

High-Temperature Tapered Caps

Tapered Cap Assortments

Square Caps

Heavy Duty Square Caps

Rectangular Caps

Angle Caps

Heavy Duty Angle Caps

Corner Caps

Threaded Caps

High-Visibility Pull-Tab Caps

Flexible Pull-Tab Caps

Rigid Pull-Tab Caps

Tear-Tab Caps

Propane Tank Tear-Tab Caps

Squeeze Top Caps

Stretchable Sealing Caps

Stretchable Elastic Caps

Heat-Shrink Round Caps

Expandable High-Temperature
Tapered Plugs

Hollow High-Temperature
Tapered Plugs

Miniature High-Temperature
Tapered Plugs

Chemical-Resistant
Pull-Through Round Plugs

High-Temperature
Pull-Through Round Plugs

Threaded Round Plugs
for Straight-Thread Pipe

High-Temperature Round
Plugs for NPT Pipe

Threaded Round Plugs
for 37° Flared Tube