Iron Pipe Fitting Plugs | McMaster-Carr

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300 Series Stainless Steel

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268 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Low-Pressure Iron and Steel
Threaded Pipe Fittings with Sealant

To prevent leaks in low-pressure lines, the male threads on these fittings have an acrylic sealant already applied for extra protection.

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Fittings

Suitable for use in fire-protection applications, these pipe fittings are made of cast iron, so they are brittle and can be quickly opened with the strike of a sledge hammer.

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

Medium-Pressure Iron and
Steel Threaded Pipe Fittings

For use in noncorrosive environments, these fittings have better strength than our low-pressure iron and steel pipe fittings.

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.

FM-Approved Low-Pressure Cast
Iron Unthreaded Pipe Flanges

FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer.

Low-Pressure Steel Unthreaded Pipe Flanges

Bolt two flanges of the same size together with a gasket to create an access point in a pipe line.

Grooved-End Iron Pipe Fittings

The grooved ends on these iron fittings connect to pipe with a clamp to easily install piping systems.

Low-Pressure Clamp-On Connectors
for Drain, Waste, and Vent

To make installing and maintaining systems easy, these connectors come with clamps that form a strong seal on pipe and fittings once tightened.

Hose Fittings

Twist-Claw Hose Couplings for Air and Water

Couplings have an identical claw-style head that connects to another twist-claw hose coupling with a quarter twist.

Cam-and-Groove Hose
Couplings for Abrasive Material

Made of ductile iron, these couplings are tough enough to handle sand, cement, and other abrasive solids and slurries. Use their cam-and-groove fittings to quickly connect and disconnect medium- to large-diameter hose lines.

Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Low-Pressure Iron and SteelThreaded Pipe Fittings with Sealant

FM-Approved Low-PressureCast Iron Threaded Pipe Fittings

Low-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

Medium-Pressure Iron andSteel Threaded Pipe Fittings

Medium-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

FM-Approved Low-Pressure CastIron Unthreaded Pipe Flanges

Low-Pressure Steel Unthreaded Pipe Flanges

Grooved-End Iron Pipe Fittings

Low-Pressure Clamp-On Connectorsfor Drain, Waste, and Vent

Hose Fittings

Twist-Claw Hose Couplings for Air and Water

Cam-and-Groove HoseCouplings for Abrasive Material

Low-Pressure Iron and Steel
Threaded Pipe Fittings with Sealant

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Fittings

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Medium-Pressure Iron and
Steel Threaded Pipe Fittings

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

FM-Approved Low-Pressure Cast
Iron Unthreaded Pipe Flanges

Low-Pressure Clamp-On Connectors
for Drain, Waste, and Vent

Cam-and-Groove Hose
Couplings for Abrasive Material