Square Head Pipe Plugs

A pipe plug is a type of fitting used to close the end of a pipe or to block the flow of fluid within a pipe system. It typically consists of a cylindrical body with external threads that match the internal threads of the pipe. The plug is threaded into the pipe to create a seal, preventing the flow of liquid or gas through the pipe. Some pipe plugs may also have a square or hexagonal head to facilitate tightening with a wrench or can have a broached hexagonal socket when the plug needs to sit flush.

Square Head Plug Dimensions


Nominal Pipe Size	Minimum Length, A	Minimum Square Height, B	Minimum Width Flats, C
¹/₈	0.38	0.25	0.28
¹/₄	0.44	0.25	0.38
³/₈	0.50	0.31	0.44
¹/₂	0.56	0.38	0.56
³/₄	0.62	0.44	0.62
1	0.75	0.50	0.81
1 ¹/₄	0.81	0.56	0.94
1 ¹/₂	0.81	0.62	1.12
2	0.88	0.69	1.31
2 ¹/₂	1.06	0.75	1.50
3	1.12	0.81	1.69
4	1.25	1.00	2.50

Round Head Plug Dimensions


Nominal Pipe Size	Minimum Length, A	Nominal Head Diameter, E	Minimum Length, D
¹/₈	0.38	0.41	1.38
¹/₄	0.44	0.53	1.62
³/₈	0.50	0.69	1.62
¹/₂	0.56	0.84	1.75
³/₄	0.62	1.06	1.75
1	0.75	1.31	2.00
1 ¹/₄	0.81	1.69	2.00
1 ¹/₂	0.81	1.91	2.00
2	0.88	2.38	2.50
2 ¹/₂	1.06	2.88	2.75
3	1.12	3.50	2.75
4	1.25	4.50	3.00

Hex Plugs and Bushing Dimensions


Nominal Pipe Size	Minimum Length, A	Nominal Width Flats, F	Minimum Hex Height, C
Nominal Pipe Size	Minimum Length, A	Nominal Width Flats, F	Bushing, G	Plug, H
¹/₈	0.38	0.44	—	0.25
¹/₄	0.44	0.62	0.12	0.25
³/₈	0.50	0.69	0.16	0.31
¹/₂	0.56	0.88	0.19	0.31
³/₄	0.62	1.06	0.22	0.38
1	0.75	1.38	0.25	0.38
1 ¹/₄	0.81	1.75	0.28	0.56
1 ¹/₂	0.81	2.00	0.31	0.62
2	0.88	2.50	0.34	0.69
2 ¹/₂	1.06	3.00	0.38	0.75
3	1.12	3.50	0.41	0.81
4	1.25	4.62	0.50	1.00

Pipe Plugs Specifications

STANDARD (ASME/ANSI)
- ASME B16.11-2011
METRIC (IFI)

Product Overview

Get our product definition, description for pipe plugs along applications & industries which employ them.

What are Pipe Plugs

A pipe plug is a device used to seal the end of a pipe in order to prevent the flow of liquids, gases, or other substances through that section of the piping system.

What are the Common Uses

Isolation for Maintenance: Pipe plugs can isolate a section of a pipe so that maintenance or repairs can be conducted without shutting down the entire system.

Pressure Testing: Inflatable or mechanical plugs are used in hydrostatic or pneumatic testing to check the integrity of a pipeline by sealing off sections and applying pressure.

Temporary Sealing: During construction or pipeline modifications, plugs temporarily block off unused or incomplete pipe sections to prevent debris or fluid ingress.

Permanent Sealing: In some cases, pipe plugs are used for permanent closure of abandoned pipes.

Common Threaded Pipe Plugs

Hex Head Plugs

Hex Socket Plugs

Square Head Plugs