M2.5 Threaded Rods | McMaster-Carr

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	Hex Length Hex Length

	Gender Gender

Female

	Thread Length Thread Length

	Nut Type Nut Type


Hex	Coupling

	Width Width

4mm

4.5 mm

	Hex Size Hex Size

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63 Products

About Threaded Studs and Rods

About Nuts, Materials, and Finishes

These threaded rods are about half the strength of medium-strength steel threaded rods for light duty hanging, mounting, and fastening.

Zinc-plated steel threaded rods are corrosion resistant in wet environments.

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

Zinc-Plated Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M2.5
50 mm	0.45	50,000	Rockwell B49	DIN 976	1	000000000	00000
300 mm	0.45	50,000	Rockwell B49	DIN 976	1	000000000	00000
1 m	0.45	50,000	Rockwell B49	DIN 976	1	000000000	00000

Metric 18-8 Stainless Steel Threaded Rods

These 18-8 stainless steel threaded rods have good chemical resistance and may be mildly magnetic.

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

18-8 Stainless Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M2.5
12 mm	0.45	70,000	Not Rated	DIN 976	10	000000000	000000
16 mm	0.45	70,000	Not Rated	DIN 976	10	000000000	00000
20 mm	0.45	70,000	Not Rated	DIN 976	10	000000000	00000
25 mm	0.45	70,000	Not Rated	DIN 976	10	000000000	00000
300 mm	0.45	70,000	Not Rated	DIN 976	1	000000000	0000
500 mm	0.45	70,000	Not Rated	DIN 976	1	000000000	0000
1 m	0.45	70,000	Not Rated	DIN 976	1	000000000	00000
2 m	0.45	70,000	Not Rated	DIN 976	1	000000000	00000

Metric Super-Corrosion-Resistant 316 Stainless Steel Threaded Rods

These 316 stainless steel threaded rods are more corrosion resistant than 18-8 and 410 stainless steel threaded rods and have excellent resistance to chemicals and salt water. They may be mildly magnetic. All meet DIN 976 specifications for dimensional standards.

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

316 Stainless Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M2.5
12 mm	0.45	70,000	Not Rated	DIN 976	5	000000000	00000
25 mm	0.45	70,000	Not Rated	DIN 976	5	000000000	0000
300 mm	0.45	70,000	Not Rated	DIN 976	1	000000000	0000
500 mm	0.45	70,000	Not Rated	DIN 976	1	000000000	0000
1 m	0.45	70,000	Not Rated	DIN 976	1	000000000	00000

Metric Brass Threaded Rods

These brass threaded rods are corrosion resistant in wet environments, electrically conductive, and nonmagnetic.

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

Brass
Lg., m	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met		Each
M2.5
1	0.45	50,000	Rockwell B55	DIN 976	000000000	000000

Steel Press-Fit Studs

These steel studs are zinc plated to resist corrosion in wet environments. Press them into a drilled or punched hole with an arbor press or similar pressure tool. Also known as self-clinching studs, ribs under the head hold the stud firmly in place. Length listed is overall length.

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

Metric Zinc-Plated Steel
Lg., mm	Thread Pitch, mm	PEM® Part Number	Thread Lg., mm	Drill Bit Size	For Min. Material Thick., mm	For Min. Lg. Between Hole Center and Sheet Edge, mm	For Hole Dia., mm	Hole Size Tolerance, mm	Base Dia., mm	Tensile Strength	Hardness	Pkg. Qty.		Pkg.
M2.5
6	0.45	FH-M2.5-6	4	No. 40	1.000	5.5	2.5	0.000 to 0.08	4.5	Not Rated	Not Rated	50	000000000	000000
10	0.45	FH-M2.5-10	8	No. 40	1.000	5.5	2.5	0.000 to 0.08	4.5	Not Rated	Not Rated	50	000000000	00000
15	0.45	FH-M2.5-15	13	No. 40	1.000	5.5	2.5	0.000 to 0.08	4.5	Not Rated	Not Rated	50	000000000	00000
18	0.45	FH-M2.5-18	16	No. 40	1.000	5.5	2.5	0.000 to 0.08	4.5	Not Rated	Not Rated	25	000000000	00000

Stainless Steel Press-Fit Studs

18-8 stainless steel studs have good chemical resistance and may be mildly magnetic. Press them into a drilled or punched hole with an arbor press or similar pressure tool. Also known as self-clinching studs, ribs under the head hold the stud firmly in place. Length listed is overall length.

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

Metric 18-8 Stainless Steel
Lg., mm	Thread Pitch, mm	PEM® Part Number	Thread Lg., mm	Drill Bit Size, mm	For Min. Material Thick., mm	For Min. Lg. Between Hole Center and Sheet Edge, mm	For Hole Dia., mm	Hole Size Tolerance, mm	Base Dia., mm	Tensile Strength	Hardness	Pkg. Qty.		Pkg.
M2.5
6	0.45	FHS-M2.5-6	4	2.5	1.000	5	2.5	0.000 to 0.08	3.7	Not Rated	Not Rated	25	000000000	000000
8	0.45	FHS-M2.5-8	6	2.5	1.000	5	2.5	0.000 to 0.08	3.7	Not Rated	Not Rated	25	000000000	00000
10	0.45	FHS-M2.5-10	8	2.5	1.000	5	2.5	0.000 to 0.08	3.7	Not Rated	Not Rated	25	000000000	00000
12	0.45	FHS-M2.5-12	10	2.5	1.000	5	2.5	0.000 to 0.08	3.7	Not Rated	Not Rated	25	000000000	00000
15	0.45	FHS-M2.5-15	13	2.5	1.000	5	2.5	0.000 to 0.08	3.7	Not Rated	Not Rated	25	000000000	00000

Metric Low-Strength Steel Coupling Nuts

Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.

Zinc-plated steel coupling nuts resist corrosion in wet environments.

Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.

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

Thread					Each
Size	Pitch, mm	Lg., mm	Wd., mm		1-9	10-Up
Zinc-Plated Steel
M2.5	0.45	6	4.5	000000000	00000	00000
Black-Oxide Steel
M2.5	0.45	6	4.5	000000000	000	000

Metric 18-8 Stainless Steel Coupling Nuts

Stainless Steel

Black-Oxide Stainless Steel

Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.

Coupling nuts with a black-oxide finish have a dark surface color.

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

Thread					Each
Size	Pitch, mm	Lg., mm	Wd., mm		1-9	10-Up
18-8 Stainless Steel
M2.5	0.45	6	4	000000000	00000	00000
Black-Oxide 18-8 Stainless Steel
M2.5	0.45	6	4	000000000	0000	0000

Plastic Coupling Nuts

These nylon 6/6 coupling nuts are chemical resistant, nonconductive, and lightweight. Also known as extension nuts, use them to connect and extend threaded rods.

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

				Temperature Range, °F				Each
Thread Size	Lg.	Wd.	Threading	Min.	Max.	Color		1-9	10-Up
Nylon 6/6 Plastic
M2.5	6mm	4.5mm	Fully Threaded	-40°	250°	Off-White	0000000	00000	00000

Steel Extra-Long Coupling Nuts

Also known as sleeve nuts, these are at least twice the length of standard coupling nuts to provide more room to connect and extend long lengths of threaded rods.

Zinc-plated steel nuts resist corrosion in wet environments.

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

Metric

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Threading		1-9	10-Up
Zinc-Plated Steel
M2.5	0.45	12	4.5	Fully Threaded	000000000	00000	00000

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench. Small adapters can also be used as standoffs, positioning and separating circuit boards and other components in assemblies.

Choose black-oxide steel adapters to match the aesthetics of your system or for their mild corrosion resistance. The finish won't chip or rub off. They resist rust in indoor and dry environments, but avoid using them in corrosive environments.

Zinc-plated steel adapters are a good option in dry environments. The zinc plating prevents the steel from corroding until the plating wears away.

18-8 stainless steel adapters resist corrosion caused by water. They're good for wet and damp environments but will corrode when exposed to salt water and other chloride solutions.

At about a third of the weight of steel adapters, aluminum adapters are the lightest we offer. They resist corrosion in wet environments.

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

Thread Size			Thread Lg.		Thread Fit		Hex						Each
(A)	(B)	Pitch (B), mm	(A)	(B), mm	(A)	(B)	Size	Lg.	Specifications Met	Tensile Strength, psi	Hardness		1-9	10-Up
Black-Oxide Steel
2-56	M2.5	0.45	0.187"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A108	78,000	Rockwell B85	000000000	00000	00000
4-40	M2.5	0.45	1/4"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A108	78,000	Rockwell B85	000000000	0000	0000
6-32	M2.5	0.45	3/8"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A108	78,000	Rockwell B85	000000000	0000	0000
8-32	M2.5	0.45	0.437"	4.8	Class 2B	Class 6H	1/4"	1 1/2"	ASTM A108	78,000	Rockwell B85	000000000	0000	0000
Zinc-Plated Steel
2-56	M2.5	0.45	0.187"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A108, ASTM B633	78,000	Rockwell B85	000000000	0000	0000
4-40	M2.5	0.45	1/4"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A108, ASTM B633	78,000	Rockwell B85	000000000	0000	0000
6-32	M2.5	0.45	3/8"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A108, ASTM B633	78,000	Rockwell B85	000000000	0000	0000
8-32	M2.5	0.45	0.437"	4.8	Class 2B	Class 6H	1/4"	1 1/2"	ASTM A108, ASTM B633	78,000	Rockwell B85	000000000	0000	0000
18-8 Stainless Steel
2-56	M2.5	0.45	0.187"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A582	85,000	Rockwell B80	000000000	00000	0000
4-40	M2.5	0.45	1/4"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A582	85,000	Rockwell B80	000000000	00000	0000
6-32	M2.5	0.45	3/8"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM A582	85,000	Rockwell B80	000000000	00000	0000
8-32	M2.5	0.45	0.437"	4.8	Class 2B	Class 6H	1/4"	1 1/2"	ASTM A582	85,000	Rockwell B80	000000000	00000	0000
Aluminum
2-56	M2.5	0.45	0.187"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM B211	45,000	Rockwell B56	000000000	0000	0000
4-40	M2.5	0.45	1/4"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM B211	45,000	Rockwell B56	000000000	0000	0000
6-32	M2.5	0.45	3/8"	4.8	Class 2B	Class 6H	3/16"	1"	ASTM B211	45,000	Rockwell B56	000000000	0000	0000
8-32	M2.5	0.45	0.437"	4.8	Class 2B	Class 6H	1/4"	1 1/2"	ASTM B211	45,000	Rockwell B56	000000000	0000	0000

Metric-to-Metric Female Hex Thread Adapters

Increase or decrease metric thread size from one male-threaded part to another. Commonly used to connect two differently sized threaded rods, they have a hex-shaped body, so you can tighten them with a standard wrench. You can also use these adapters to change thread pitch or convert a male-threaded connection to a female-threaded connection. Small adapters can work as threaded standoffs, positioning and separating circuit boards and other components in assemblies.

Zinc-plated steel adapters are a good option in dry environments. The zinc plating prevents the steel from corroding until the plating wears away.

At about a third of the weight of steel adapters, aluminum adapters are the lightest we offer. They resist corrosion in wet environments.

18-8 stainless steel adapters resist corrosion caused by water. They're good for wet and damp environments but will corrode when exposed to salt water and other chloride solutions.

316 stainless steel adapters have the best corrosion resistance. They stand up to wet environments, just like 18-8 stainless steel adapters, but unlike 18-8 stainless steel adapters, they resist corrosion caused by salt water and harsh chemicals.

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

Thread Size				Thread Lg.		Thread Fit		Hex					Each
(A)	Pitch (A), mm	(B)	Pitch (B), mm	(A), mm	(B), mm	(A)	(B)	Size, mm	Lg., mm	Specifications Met	Hardness		1-9	10-Up
Black-Oxide Steel
M2.5	0.45	M3	0.5	4.8	6.4	Class 6H	Class 6H	4.5	25	ASTM A108	Rockwell B85	000000000	00000	00000
M3.5	0.6	M2.5	0.45	9.5	4.8	Class 6H	Class 6H	6	37	ASTM A108	Rockwell B85	000000000	0000	0000
M4	0.7	M2.5	0.45	11.1	4.8	Class 6H	Class 6H	6	37	ASTM A108	Rockwell B85	000000000	0000	0000
Zinc-Plated Steel
M2.5	0.45	M3	0.5	4.8	6.4	Class 6H	Class 6H	4.5	25	ASTM A108, ASTM B633	Rockwell B85	000000000	0000	0000
M3.5	0.6	M2.5	0.45	9.5	4.8	Class 6H	Class 6H	6	37	ASTM A108, ASTM B633	Rockwell B85	000000000	0000	0000
M4	0.7	M2.5	0.45	11.1	4.8	Class 6H	Class 6H	6	37	ASTM A108, ASTM B633	Rockwell B85	000000000	0000	0000
Aluminum
M2.5	0.45	M3	0.5	4.8	6.4	Class 6H	Class 6H	4.5	25	ASTM B211	Rockwell B56	000000000	0000	0000
M3.5	0.6	M2.5	0.45	9.5	4.8	Class 6H	Class 6H	6	37	ASTM B211	Rockwell B56	000000000	0000	0000
M4	0.7	M2.5	0.45	11.1	4.8	Class 6H	Class 6H	6	37	ASTM B211	Rockwell B56	000000000	0000	0000
18-8 Stainless Steel
M2.5	0.45	M3	0.5	4.8	6.4	Class 6H	Class 6H	4.5	25	ASTM A582	Rockwell B80	000000000	00000	0000
M3	0.35	M2.5	0.45	3	3	Class 6H	Class 6H	8	15	ASTM A582	Rockwell B80	000000000	0000	0000
M3.5	0.6	M2.5	0.45	9.5	4.8	Class 6H	Class 6H	6	37	ASTM A582	Rockwell B80	000000000	00000	0000
M4	0.7	M2.5	0.45	11.1	4.8	Class 6H	Class 6H	6	37	ASTM A582	Rockwell B80	000000000	00000	0000
316 Stainless Steel
M3	0.35	M2.5	0.45	3	3	Class 6H	Class 6H	8	15	ASTM A276	Rockwell B83	000000000	0000	0000
M3	0.5	M2.5	0.45	3	3	Class 6H	Class 6H	8	15	ASTM A276	Rockwell B83	000000000	0000	0000

About Threaded Studs and Rods

About Nuts, Materials, and Finishes

Metric Low-Strength Steel Threaded Rods

Metric 18-8 Stainless Steel Threaded Rods

Metric Super-Corrosion-Resistant 316 Stainless Steel Threaded Rods

Metric Brass Threaded Rods

Steel Press-Fit Studs

Stainless Steel Press-Fit Studs

Metric Low-Strength Steel Coupling Nuts

Metric 18-8 Stainless Steel Coupling Nuts

Plastic Coupling Nuts

Steel Extra-Long Coupling Nuts

Inch-to-Metric Female Hex Thread Adapters

Metric-to-Metric Female Hex Thread Adapters