Welding Caps | McMaster-Carr

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314 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Standard-Wall Butt-Weld Steel
Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

With thicker, stronger walls than our standard-wall butt-weld pipe fittings, these fittings stand up to your high strength applications.

High-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slide the pipe into the socket and weld.

Extreme-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Also known as Pressure Class 6000 fittings, these heavy duty forged fittings are the strongest steel fittings we offer.

Standard-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Thin-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Also known as Schedule 10 fittings, these are thin, lightweight, and corrosion resistant.

High-Pressure Socket-Connect
Stainless Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slip the pipe into the socket and weld.

Thick-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Extreme-Pressure Socket-Connect
Stainless Steel Unthreaded Pipe Fittings

The strongest socket-connect fittings we offer, these heavy duty forged fittings are also known as Pressure Class 6000.

Standard-Wall Butt-Weld Aluminum
Unthreaded Pipe Fittings

Also known as Schedule 40 fittings, these have thicker walls than our thin-wall aluminum unthreaded pipe fittings.

High-Purity PVDF Pipe Fittings
for Corrosive Chemicals

Made of PVDF that’s finished to a 12 Ra smoothness, these fittings handle some of the harshest chemicals without leaching contaminants into your line. Comparable to Kynar, they handle most organic solvents that would dissolve CPVC, and chlorine or nitric acid that would weaken polypropylene.

High-Purity Polypropylene Pipe
Fittings for Corrosive Chemicals

The inside of these fittings won’t leach contaminants into your line or accumulate particles—they’re polished to an ultra-smooth 12 Ra finish, which also makes them easy to clean. Made of polypropylene, they resist organic solvents, acids, and alkalis better than CPVC fittings.

Butt-Weld Fittings for Stainless Steel Tubing

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Personal Protective Equipment

Shop Caps

Keep sun and sweat out of your eyes with these breathable, washable caps.

Shop Beanies

These beanies are designed for a snug fit and provide good breathability.

Welding Face Masks

These face masks are double-layered to protect your head from radiant heat, flames, and welding sparks.

Hand-Held Welding Face Shields

Hold these lightweight face shields up to your face for quick inspection of welding activity.

Welding Face Shields

For full-face protection while welding, select one of these shields.

Auto-Darkening Welding Helmets

The lens on these helmets automatically switches from light to dark the instant you start welding.

Welding Helmets

Providing greater safety while welding than face shields, these helmets have an outer filter lens cover for protection from scratches and weld spatter.

Heat-Reflective Filter Lenses for
Welding Helmets and Goggles

The gold coating on these lenses reflects high temperatures.

Auto-Darkening Filter Lenses for
Welding Helmets and Goggles

These lenses automatically switch from light to dark the instant you start welding.

Filter Lenses for Welding Helmets and Goggles

Replace the filter lens on your welding helmet or goggles; available in shade numbers 4 through 12.

Magnifiers for Welding Helmets and Goggles

Attach these magnifiers to welding lenses to enhance details.

Filter Lens Covers for Welding Helmets and Goggles

Protect filter lenses from scratches and weld spatter with these clear covers.

Low-Profile Respirators

Designed to fit easily under welding helmets. Replace the filter when breathing through these respirators becomes difficult.

Powered Air-Purifying Respirators

These mobile respirators filter contaminants to deliver breathable air without the need for an air line connection. The pump sits on your back to allow unrestricted movement, so these respirators are often used in welding, painting, and pharmaceutical applications.