Round Tube Connectors | McMaster-Carr

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52,097 Products

Building and Machinery Hardware

Slip-On Framing Connectors

Tighten onto slip-on framing rails to build guards, railings, and racks

246 products

Slip-On Framing Rail Ends

Mount slip-on framing structures to floors, walls, and ceilings

78 products

Slip-On Framing Rail Supports

Brace long runs of slip-on framing rails, either along walls or through them

33 products

Clamp-On Framing and Fittings

Two-piece fittings let you modify assembly stations, conveyors, and racks without dismantling them

205 products

Flush-Fit Framing and Fittings

Create smooth stair and platform railings by sliding fittings into rails and tightening the screws

10 products

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

42 products

Fluid Handling

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

17,283 products

Pipe and Pipe Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

23,457 products

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

7,604 products

Pipe Joiners

Connect heavy and difficult-to-position gasketed pipe without powered equipment

1 product

Hose Crimpers

Crimp ferrules onto hose to secure fittings

43 products

Tube Crimpers

Create a leak-tight seal between tubing and fittings without heat or solder

25 products

Tube Repair Clamps

Mend small holes, cracks, and full-circle breaks in tubing without dismantling your system

18 products

Manifolds

Distribute air or fluid to multiple places from a single source; also called headers

637 products

Air Chucks

Connect air hose to Schrader valves, which are common on tires and hydraulic systems

28 products

Junction Blocks

Organize and separate multiple lines in a pipe system; air and fluid flow through the threaded holes

88 products

Strainers

Install next to valves and pumps to catch debris in your line

9 products

Fastening and Joining

Tube-Connecting Nuts

Push inside tubes to join them with a threaded stud instead of welding

21 products

Gravity Pins

Slip through holes in telescoping tubing and wrap around to secure

1 product

Spring Button Clips

Join pieces of telescoping tubing using spring force

40 products

Lubricating

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

41 products

Material Handling

Scaffold Clamps

Construct scaffolding and secure supports, such as railings

2 products

Scaffold Locking Pins

Fasten base plates, guardrail posts, and other components to scaffold frames

4 products

Measuring and Inspecting

Hose Coupling Size-Identification Kits

Match your hose coupling to one of the plugs to determine its size without measuring

1 product

Power Transmission

Shaft Collar Adapters

Sized specifically to adapt standard shaft collars to pipe, creating a tight fit

12 products

Facility and Grounds Maintenance

Faucet Spout Thread Adapters

Connect the female end of your garden hose to a faucet spout

4 products

Safety Equipment

Respirator Temperature Controllers

Adjust the temperature of the air flowing into your respirator

2 products

Sealing

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

1,399 products