M24 Adapters | McMaster-Carr

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15 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.

How to Install Key-Locking Inserts

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 steel, which has fair 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.

Straight Adapters, Male

BSPP, Metric, and UN/UNF
(SAE) Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

BSPP Male × Metric Male
Pipe Size (A)	Dash Size (A)	Thread Size (B)	Max. Pressure	For Use With	Specifications Met		Each
3/4	12	M24 × 1.5 mm	3,500 psi @ 72° F	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 1179, ISO 6149, ISO 8434-6, ISO 9974	00000000	000000

Replacement Washers

Temperature Range: -20° to 230° F

For BSPP Male
For Pipe Size	For Thread Size	Gasket Material	Thickness		Each
3/4	__	Buna-N Rubber	2.5mm	00000000	00000
For Metric Male
__	M24	Buna-N Rubber	2mm	00000000	0000

Black-Phosphate Steel Easy-to-Install Thread-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Also known as E-Z Lok, these inserts use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. Installation requires a drill bit and a standard tap. Then set the insert with a bolt and two nuts, or use an installation bit.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

To drive slotted inserts, you can use a slotted screwdriver instead of using an installation bit or a bolt and two nuts.

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

Metric

Installation Bit

Inserts
			For Tap									Installation Bits
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Drive Style	Pkg. Qty.		Pkg.		Each
Black-Phosphate Steel with Thick Wall
M24	3	Coarse	M36	4	30mm	33 mm	33mm	Slotted	1	000000000	00000	000000000	000000

18-8 Stainless Steel Key-Locking Inserts

Made of stainless steel, these inserts have good corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

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

Metric

Inserts
			For Tap							Each		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		1-9	10-Up		Each
18-8 Stainless Steel with Thick Wall
M24	3	Coarse	M33	2	33mm	31 mm	31mm	4	000000000	000000	000000	000000000	000000

Black-Phosphate Steel Key-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole with stripped threads.

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

Metric

Inserts
			For Tap							Each		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		1-9	10-Up		Each
Black-Phosphate Steel with Thick Wall
M24	3	Coarse	M33	2	33mm	31 mm	31mm	4	000000000	000000	000000	000000000	000000
M24	2	Fine	M33	2	33mm	31 mm	31mm	4	000000000	00000	00000	000000000	00000

Key-Locking Inserts with Installation Tool

Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. These inserts are used to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.

18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.

Black-phosphate steel inserts are mildly corrosion resistant.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

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

Metric

			For Tap
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys	No. of Inserts Included		Each
18-8 Stainless Steel with Thick Wall
M24	3	Coarse	M33	2	33mm	31 mm	31mm	4	2	000000000	0000000
M24	2	Fine	M33	2	33mm	31 mm	31mm	4	2	000000000	000000
Black-Phosphate Steel with Thick Wall
M24	3	Coarse	M33	2	33mm	31 mm	31mm	4	2	000000000	000000
M24	2	Fine	M33	2	33mm	31 mm	31mm	4	2	000000000	000000

Screw-Locking Key-Locking Inserts

Cadmium-Plated Steel

Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating. This creates a mechanical lock, which is stronger than the chemical lock from adhesive on thread-locking inserts. Because they’re made of a solid piece of metal, these inserts are also stronger than helical inserts, which are made of coiled wire. They're often used in molds, tools and dies, and suspension systems in vehicles to create completely new threads, add strong threads in soft metal, or replace existing threads that are damaged or need to be resized.

A dry-film lubricant makes it easy to install them and screw fasteners in. To install, use a tap to create the threads in your material and an installation tool to drive the keys into the material. All are made to tight tolerances with strictly controlled materials. Many inch sizes also meet military or aerospace standards for dimensions and material.

These inserts resist corrosion in wet environments. Cadmium-plated steel inserts are stronger than stainless steel inserts.

Inserts with thick walls are most commonly used; they’re stronger than thin-wall inserts and are used in larger holes.

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

Metric

Inserts
			For Tap								Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		Each		Each
Cadmium-Plated Steel with Thick Wall
M24	3	Coarse	M33	2	33	31 mm	31 mm	4	000000000	0000000	000000000	000000