Hex Socket Pipe Plugs

Hex socket pipe plugs are critical components designed to seal and protect piping systems from contamination, pressure loss, and environmental damage. Featuring an internal hex drive, these plugs ensure easy installation and removal, even in tight spaces. At Nickel Systems, we specialize in hex socket pipe plugs crafted from exotic alloys like Hastelloy®, Inconel®, and Monel®, offering superior resistance to corrosion, extreme temperatures, and harsh chemicals. These high-performance materials make them ideal for demanding industries such as chemical processing, aerospace, and marine applications.

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Specifications

Get our specifications and technical data for our hex socket pipe plugs.

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 (ISO & DIN)

Three Blue Hexagons Are Lined Up On A White Background

Product Overview

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

What are Hex Socket Pipe Plugs

Hex socket pipe plugs are threaded fittings used to seal the ends of pipes or fittings. They feature a hexagonal-shaped socket (recess) that allows them to be tightened or removed using a hex key (Allen wrench).

Check out our parts diagram:

Advantages to Hex Socket Pipe Plugs

Hex socket pipe plugs offer several advantages when compared with hex head pipe plugs & square head pipe plugs.

Flush or Low-Profile Fit: Hex socket plugs sit flush or slightly recessed within the fitting or pipe.
Better for Confined or Hard-To-Reach Areas: Because of the flush or slightly recessed location, they can be fit into tight spaces where a protruding head cannot fit.
Cleaner Appearance: The flush or recessed plugs offer a sleeker, more professional look.
Improved Protection against Damage: Since a hex socket pipe plug does not have an external head, it is less susceptible to impacts, corrosion, or accidental knocks.

Applications of Hex Socket Pipe Plugs

Chemical Processing Plants

Hex socket pipe plugs seal ports in chemical reactors, piping systems, and pressure vessels handling aggressive chemicals like acids, chlorides, or solvents
Exotic alloys employed include Hastelloy® C-276, Monel® 400, & Titanium Grade 2.
Industries include chemical manufacturing, petrochemical, and pharmaceuticals.

Subsea & Offshore Platforms

Hex socket pipe plugs are used in subsea control systems, pressure manifolds, and valves, where equipment is exposed to saltwater, high pressures, and extreme temperatures.
Exotic alloys include Inconel® 625, and 2507 Super Duplex Steel.
Industries include oil & gas and energy exploration.

Fuel, Hydraulic, and Pneumatic Systems in Aerospace

Hex socket pipe plugs seals access ports in aircraft hydraulic systems, fuel delivery systems, and engine manifolds that experience high temperatures and extreme pressures.
Exotic alloys include Inconel® 718 and Titanium Grade 5.
Industries include aerospace, defense, & Space exploration.

Marine & Shipbuilding

Hex socket pipe plugs are used in ballast systems, seawater cooling lines, and hull piping, where constant exposure to seawater causes sever corrosion.
Exotic alloys used are Monel® 400 & 2507 Super Duplex Stainless Steel.
Industries include marine engineering, shipbuilding & naval defense.

Power Generation

Hex socket pipe plugs seal cooling systems, steam lines, and high-pressure conduits in nuclear reactors or high-efficiency power plants.
Exotic alloys include Inconel® 600, Inconel® 625, & Hastelloy® X.
Industries include nuclear power, thermal power plants, and renewable energy.

Food & Beverage

Hex socket pipe plug in sanitary piping systems where plugs need to withstand cleaning agents, steam sterilization, and acidic / alkaline fluids without contamination.
Exotic alloys used include AL-6XN & Titanium Grade 2.
Industries include food processing, beverage production and pharmaceutical manufacturing.

Sample Products

Check out our sample products for our hex head pipe plugs.

Hex Head Pipe Plug 1/2″ Diameter 2507 Super Duplex Material

Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.