M4 Bore Sealing Plugs | McMaster-Carr

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2,000 psi to 2,999 psi

4,500 psi or greater

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6.5 mm

8.5 mm

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10 Products

Installation Tools for Pull-Through Bore Sealing Plugs

Expand the sleeve on pull-through bore sealing plugs to permanently seal a flow path in a manifold or other channel. These tools work with the pull of a trigger, making them a good choice for high-volume assemblies. While most plugs get hammered into place, which risks damage to your equipment, these installation tools simply reach into holes to expand the plug.

					Air Connection			Body
For Thread Size	Stroke Lg.	Operating Pressure, psi	Pulling Force, lbf	Wt., lb.	Pipe Size	Thread Type	Gender	Wd.	Dia.	Head Lg.	Overall Ht.		Each



	4-40, 6-32, 8-32, 10-24, 10-32, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, M2, M3, M4, M5, M6, M8, M10	0.04" to 0.28"	75 to 100	5,000	4	1/4	NPT	Female	1"	4 5/16"	10 1/4"	10 1/2"	6388N11	000000000

Mandrel and Nosepiece Sets

Select the mandrel and nosepiece set that matches the thread size of the plug you're installing.

For Thread Size	Max. Thread Lg.	Includes		Each
4-40	45/64"	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N11	0000000
6-32	49/64"	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N12	000000
M2 × 0.4 mm	6 mm	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N16	000000
M3 × 0.5 mm	11.8 mm	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N26	000000
M4 × 0.7 mm	14.8 mm	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N14	000000
M5 × 0.8 mm	15.6 mm	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N27	000000
M6 × 1 mm	27.4 mm	Mandrel, Anvil, Hex Driver, Lock Nut, Sleeve	6408N15	000000

Pull-Through Bore Sealing Plugs

Permanently plug unused holes–even deep or angled ones—in manifolds and other hydraulic or pneumatic components. The required installation tool reaches inside holes to expand these plugs with the pull of a trigger, making them a good choice for high-volume assembly. The tool lets you install them without risking damage to your equipment, unlike most plugs that have to be hammered in place. These plugs resist vibration better than threaded plugs and don’t require thread sealant.

They consist of a serrated sleeve with an internally threaded pin inside it. To install, you’ll need the installation tool fitted with a mandrel and nosepiece set (both sold separately). Thread your plug onto the mandrel, then position the plug within your hole. Press the tool’s trigger to pull the plug’s pin through the sleeve, expanding it. The outer serrations will bite into the hole to seal it shut. After expanding, the tool will automatically reverse its spin to pull away from the pin.

Aluminum Sleeve—Aluminum-sleeved plugs weigh less than steel-sleeved plugs, and they’re better at resisting corrosion from air and water. However, they won’t handle pressures as high as steel-sleeved plugs. They’re ideal for plugging aluminum manifolds.

Black-Oxide Steel Sleeve—Steel-sleeved plugs handle pressures more than twice as high as aluminum-sleeved plugs. This makes them a better choice for hydraulic components.

	Installed Ht., mm	Max. Pressure, psi	Max. Temp., ° F	Thread Size	Pkg. Qty.		Pkg.
Aluminum Sleeve



	8	6.5	2,000	300	M4 × 0.7 mm	5	6272N13	000000


	Black-Oxide Steel Sleeve



			8	8.5	4,500	300	M4 × 0.7 mm	5	6272N18	00000

Accessories for Bore Sealing Plugs

Bore Sealing Plug Installation Tools

					Air Connection			Body
For Thread Size	Stroke Lg.	Operating Pressure, psi	Pulling Force, lbf	Wt., lb.	Pipe Size	Thread Type	Gender	Dia.	Wd.	Head Lg.	Overall Ht.		Each



	4-40, 6-32, M2, M3, M4, M5, M6	0.04" to 0.28"	75 to 100	5,000	4	1/4	NPT	Female	4 5/16"	1"	10 1/4"	10 1/2"	6388N11	000000000