DIN 7631 Pipe Plugs | McMaster-Carr

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41 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Compact Extreme-Pressure Steel Threaded Pipe Fittings

These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings. BSPP and metric male threads have either a gasket, or a gasket and washer, to prevent leaks.

For technical drawings and 3-D models, click on a part number.

Plugs with Hex Drive

BSPP and Metric
Male Threads
with Gasket

For Use With:
NPTF and UN/UNF (SAE Straight): Air, Hydraulic Fluid, Water
Metric, BSPP and BSPT: Air, Hydraulic Fluid, Oil, Water
Specifications Met: See table

Metric Male
Thread Size	Drive Size	Max. Pressure	Material	Specifications Met		Each
M10 × 1 mm	5 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	00000
M12 × 1.5 mm	6 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	0000
M14 × 1.5 mm	6 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	0000
M16 × 1.5 mm	6 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	0000
M18 × 1.5 mm	8 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	0000
M20 × 1.5 mm	10 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	00000
M22 × 1.5 mm	10 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	0000
M24 × 1.5 mm	10 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	00000
M26 × 1.5 mm	12 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	00000
M27 × 2 mm	12 mm	5,600 psi @ 72° F	Galvanized Steel	DIN 7631, ISO 9974	00000000	00000

Plugs with External Hex Drive

BSPP and Metric
Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

Metric Male
Thread Size	Plug Construction	Max. Pressure	Material	For Use With	Specifications Met		Each
M10 × 1 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	00000
M12 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	0000
M14 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	0000
M16 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	0000
M18 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	0000
M20 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	00000
M22 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	00000
M24 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	00000
M26 × 1.5 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	00000
M30 × 2 mm	Solid	5,600 psi @ 72° F	Galvanized Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	00000

Replacement Washers

Temperature Range: -20° to 230° F

For Metric Male
For Thread Size	Gasket Material	Thickness		Each
M10	Buna-N Rubber	2mm	00000000	00000
M12	Buna-N Rubber	1.5mm	00000000	0000
M14	Buna-N Rubber	1.5mm	00000000	0000
M16	Buna-N Rubber	1.5mm	00000000	0000
M18	Buna-N Rubber	1.5mm	00000000	0000
M20	Buna-N Rubber	1.5mm	00000000	0000
M22	Buna-N Rubber	2mm	00000000	0000
M24	Buna-N Rubber	2mm	00000000	0000
M26	Buna-N Rubber	2.5mm	00000000	0000
M27	Buna-N Rubber	2mm	00000000	0000
M30	Buna-N Rubber	2mm	00000000	0000

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks.

For technical drawings and 3-D models, click on a part number.

Plugs with Hex Drive

Metric and BSPP Male Threads with Gasket

For Use With:
NPTF: Hydraulic Fluid, Oil, Steam, Water
BSPP and Metric: Hydraulic Fluid, Oil, Water
Specifications Met:
NPTF: ASTM A479
Metric: DIN 7631, ISO 9974
BSPP: ISO 1179, ISO 8434-6

			316 Stainless Steel
Thread Size	Drive Size	Max. Pressure		Each
Metric Male
M10 × 1 mm	5 mm	5,800 psi @ 72° F	00000000	000000
M12 × 1.5 mm	6 mm	5,800 psi @ 72° F	00000000	00000
M14 × 1.5 mm	6 mm	5,800 psi @ 72° F	00000000	00000
M16 × 1.5 mm	8 mm	5,800 psi @ 72° F	00000000	00000
M18 × 1.5 mm	8 mm	5,800 psi @ 72° F	00000000	00000
M20 × 1.5 mm	10 mm	5,800 psi @ 72° F	00000000	00000
M22 × 1.5 mm	10 mm	5,800 psi @ 72° F	00000000	00000
M26 × 1.5 mm	12 mm	5,800 psi @ 72° F	00000000	00000
M27 × 2 mm	12 mm	5,800 psi @ 72° F	00000000	00000
M33 × 2 mm	17 mm	5,800 psi @ 72° F	00000000	00000