Square Pipe Flanges | McMaster-Carr

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Flange Shape

Material

Number of Mounting Holes

Slip-On Framing Component

Add-On Through-Hole Connector

Rail End

Through-Hole Rail Support

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Pipe Size

Flange Width

Press-Fit Framing Component

Rail OD

Shape

Rail Height

Rail Width

Mounting Hole Diameter

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Flanged Connection Surface

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O-Ring Groove

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Fitting Type

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Standard

Export Control Classification Number (ECCN)

REACH

DFARS Specialty Metals

Exempt

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Compliant with Exemptions

Flange Length

Specifications Met

190 Products

Building and Machinery Hardware

Press-Fit Framing Rail Ends

Bolt rails to floors, walls, and ceilings to secure your press-fit structure

1 product

Press-Fit Framing Rails

Set up temporary partitions, guards, and displays using only a hammer

3 products

Slip-On Framing Rail Ends

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

36 products

Slip-On Framing Rail Supports

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

31 products

Slip-On Framing Connectors

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

1 product

Clamp-On Framing Rail Supports

Run clamp-on framing rails in parallel to support long lengths without additional components

21 products

Clamp-On Framing Rail Ends

Connect to clamp-on framing rails to mount your structure to floors, walls, and ceilings

6 products

Flush-Fit Framing Rail Ends

Secure flush-fit framing structures to floors, walls, and ceilings

2 products

Fluid Handling

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

62 products

Sealing

Hydraulic Tank Pipe Suction Flanges

Seal pipes passing through top plates of hydraulic tanks

5 products