M3 Press-Fit Nuts | McMaster-Carr

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38 Products

Press-Fit Nuts for Sheet Metal

Add permanent threads to thin panels in seconds. The knurls on these clinch-style nuts deform and grip sheet metal to create a permanent hold. Push them into a drilled or punched hole with an arbor press around your workpiece to install—no messy welding required.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

High-Temperature High-Strength A286 Stainless Steel—Our strongest press-fit nuts are hard enough to install in stainless steel panels. They also withstand temperatures up to 1150° F and resist corrosion from chemicals such as bleach and chlorine.

Lightweight Aluminum—At one-third the weight of steel, use these nuts in robotics, aerospace parts, and other applications with strict weight limits. They resist rust about as well as stainless steel but aren't as strong, so they're best for installation in aluminum panels.

Press-Fit Nuts												Installation Tool
				Head, mm
Thread Size	Drill Bit Size	For Min. Panel Thk., mm	For Maximum Panel Hardness	OD	Wd.	Ht.	PEM® Part No.	Head Shape	Pkg. Qty.		Pkg.		Each







			Zinc-Plated Steel

			M3 x 0.5 mm	4.2 mm	0.8	Brinell 150, Rockwell B80	6.35	—	1.5	S-M3-0ZI	Round	25	000000000	00000	000000000	0000000


			M3 x 0.5 mm	4.2 mm	1	Brinell 150, Rockwell B80	6.35	—	1.5	S-M3-1ZI	Round	25	000000000	0000	000000000	000000
			M3 x 0.5 mm	4.2 mm	1.4	Brinell 150, Rockwell B80	6.35	—	1.5	S-M3-2ZI	Round	25	000000000	0000	000000000	000000
			M3 x 0.5 mm	4.2 mm	2.29	Brinell 150, Rockwell B80	6.35	—	1.5	—	Round	25	000000000	0000	———	0
			M3 x 0.5 mm	4.5 mm	1	Not Rated	—	5.5	2.1	—	Hex	25	000000000	00000	000000000	000000
			M3 x 0.5 mm	4.5 mm	1.4	Brinell 150, Rockwell B80	—	5.5	2	—	Hex	25	000000000	0000	———	0
			M3 x 0.5 mm	4.5 mm	2	Not Rated	—	5.5	1.2	—	Hex	10	000000000	0000	000000000	000000




					18-8 Stainless Steel

					M3 x 0.5 mm	11/64"	0.99	Brinell 125, Rockwell B70	4.88	—	1.9	FEOX-M3	Round	10	000000000	0000	———	0


					M3 x 0.5 mm	11/64"	1.5	Brinell 125, Rockwell B70	4.88	—	1.9	FEX-M3	Round	10	000000000	0000	———	0
					M3 x 0.5 mm	4.2 mm	0.64	Brinell 125, Rockwell B70	5.6	—	1.4	SMPS-M3	Round	25	000000000	0000	———	0
					M3 x 0.5 mm	4.2 mm	0.8	Brinell 125, Rockwell B70	6.35	—	1.5	CLS-M3-0	Round	25	000000000	0000	000000000	000000
					M3 x 0.5 mm	4.2 mm	1	Brinell 125, Rockwell B70	6.35	—	1.5	CLS-M3-1	Round	25	000000000	0000	000000000	000000
					M3 x 0.5 mm	4.2 mm	1.4	Brinell 125, Rockwell B70	6.35	—	1.5	CLS-M3-2	Round	25	000000000	0000	000000000	000000
					M3 x 0.5 mm	4.2 mm	2.29	Brinell 150, Rockwell B80	6.35	—	1.5	—	Round	25	000000000	0000	———	0
					M3 x 0.5 mm	4.5 mm	1	Not Rated	—	5.5	2.1	—	Hex	10	000000000	0000	———	0




							High-Temperature High-Strength A286 Stainless Steel

							M3 x 0.5 mm	4.2 mm	0.64	Brinell 192, Rockwell B90	5.6	—	1.4	SMPP-M3	Round	10	000000000	0000	———	0


							M3 x 0.5 mm	4.2 mm	0.8	Brinell 192, Rockwell B90	6.35	—	1.5	SP-M3-0	Round	10	000000000	0000	———	0
							M3 x 0.5 mm	4.2 mm	1	Brinell 192, Rockwell B90	6.35	—	1.5	SP-M3-1	Round	10	000000000	0000	———	0
							M3 x 0.5 mm	4.2 mm	1.4	Brinell 192, Rockwell B90	6.35	—	1.5	SP-M3-2	Round	10	000000000	0000	———	0




									Lightweight Aluminum

									M3 x 0.5 mm	3/16"	1	Brinell 80, Rockwell B50	6.35	—	2	CLA-M3-1	Round	25	000000000	0000	000000000	000000


									M3 x 0.5 mm	3/16"	1.4	Brinell 80, Rockwell B50	6.35	—	2	CLA-M3-2	Round	25	000000000	0000	000000000	000000

Press-Fit Nut Installation Tools

Use these tools to install press-fit nuts by hand. They include one hand tool, seven hole punches and dies, five fastener anvils, one flat punch, one punch adapter bushing, and one edge-depth guide.

For Thread Size	Max. Force, lbf	Wt., lb.		Each
M2, M2.5, M3, M3.5, M4, M5	2,500	2.75	000000000	0000000

Press-Fit Nuts for Soft Metals and Plastic

The ridged knurls on these broach-style nuts cut into soft metal and plastic without deforming them. They add permanent threads to everything from soft brass panels to brittle circuit boards.

Tin-Plated Steel—The plating resists corrosion from mild chemicals and salt water.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

Press-Fit Nuts										Installation Tool
				Head, mm
Thread Size	Drill Bit Size, mm	For Min. Panel Thk., mm	For Maximum Panel Hardness	OD	Ht.	PEM® Part No.	Pkg. Qty.		Pkg.		Each







			Tin-Plated Steel

			M3 x 0.5 mm	4.2	1.53	Brinell 107, Rockwell B60	5.56	1.5	KF2-M3-ET	25	000000000	00000	000000000	0000000




					18-8 Stainless Steel

					M3 x 0.5 mm	19 Ga.	1.53	Brinell 125, Rockwell B70	5.56	1.5	KFS2-M3	20	000000000	0000	000000000	000000

Flush-Profile Press-Fit Nuts for Sheet Metal

These nuts sit flush in panels for a smooth surface, so they fit in cramped enclosures. You can also install them onto parts before forming them, since the head bends along with the metal. The hex-shaped head locks into holes when installed, so the nuts won't twist as you fasten screws.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

High-Strength 400 Series Stainless Steel—Hard enough to install in stainless steel panels. These nuts are stronger than 18-8 stainless steel, but not as corrosion resistant, so they're best for environments with only occasional moisture.

				Head, mm
Thread Size	Drill Bit Size, mm	For Min. Panel Thk., mm	For Maximum Panel Hardness	Wd.	Ht.	Ht., mm	PEM® Part No.	Head Shape	Pkg. Qty.		Pkg.







			18-8 Stainless Steel

			M3 x 0.5 mm	4.4	1.53	Brinell 125, Rockwell B70	4.8	0.5	1.53	F-M3-1	Hex	25	000000000	000000


			M3 x 0.5 mm	4.4	2.32	Brinell 125, Rockwell B70	4.8	0.6	2.3	F-M3-2	Hex	25	000000000	00000




					High-Strength 400 Series Stainless Steel

					M3 x 0.5 mm	4.4	1.53	Brinell 180, Rockwell B85	4.8	0.5	1.53	F-M3-1	Hex	10	000000000	0000


					M3 x 0.5 mm	4.4	2.32	Brinell 180, Rockwell B85	4.8	0.6	2.3	F4-M3-2	Hex	10	000000000	0000

Press-Fit Locknuts for Sheet Metal

The nylon insert inside these nuts grips screws so they won't back out or loosen. Use them to keep thin parts fastened on engines and other vibrating machinery.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	For Maximum Panel Hardness	Head Ht., mm	Flange Dia., mm	PEM® Part No.	Pkg. Qty.		Pkg.
Nylon-Insert Locking







	Zinc-Plated Steel

	M3 x 0.5 mm	6	1.5	Brinell 125, Rockwell B70	3	7	PL-M3-ZI	10	000000000	00000

Closed-End Press-Fit Nuts for Sheet Metal

Fasten sheet metal without scratching or damaging nearby parts. The closed barrel on these nuts covers screws entirely once inserted and shields them from leaks and debris. Use them in electronics with sensitive components and CNC machines exposed to liquids and dust.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

				Head, mm
Thread Size	Drill Bit Size, mm	For Min. Panel Thk., mm	For Maximum Panel Hardness	OD	Ht.	Lg., mm	PEM® Part No.	Pkg. Qty.		Pkg.







			Zinc-Plated Steel

			M3 x 0.5 mm	4.2	1	Brinell 150, Rockwell B80	6.35	1.1	8.5	B-M3-1ZI	5	000000000	00000


			M3 x 0.5 mm	4.2	1.4	Brinell 150, Rockwell B80	6.35	1.1	8.5	B-M3-2ZI	5	000000000	0000




					18-8 Stainless Steel

					M3 x 0.5 mm	4.2	1	Brinell 125, Rockwell B70	6.35	1.1	8.5	BS-M3-1	5	000000000	0000


					M3 x 0.5 mm	4.2	1.4	Brinell 125, Rockwell B70	6.35	1.1	8.5	BS-M3-2	5	000000000	0000

Self-Aligning Press-Fit Nuts for Sheet Metal

Fasten together parts with off-center holes. The threaded hole within these nuts shifts up to .01" in any direction, so screws pass through every time.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

				Head, mm
Thread Size	Drill Bit Size, mm	For Min. Panel Thk., mm	For Maximum Panel Hardness	OD	Ht.	PEM® Part No.	Pkg. Qty.		Pkg.







			Zinc-Plated Steel

			M3 x 0.5 mm	7.4	1.38	Brinell 125, Rockwell B70	9.14	3.31	AS-M3-2	5	000000000	00000




					18-8 Stainless Steel

					M3 x 0.5 mm	7.4	0.97	Brinell 125, Rockwell B70	9.14	3.31	AC-M3-1	5	000000000	0000


					M3 x 0.5 mm	7.4	1.38	Brinell 125, Rockwell B70	9.14	3.31	AC-M3-2	1	000000000	0000

Self-Aligning Press-Fit Locknuts for Sheet Metal

Fasten together unaligned parts and keep screws in place. The threaded hole within these press-fit nuts shifts up to .01" in any direction, so you can fasten together thin panels with off-center holes. The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

					Head, mm		Barrel, mm
	Thread Size	Drill Bit Size, mm	For Min. Panel Thk., mm	For Maximum Panel Hardness	OD	Ht.	Dia.	Ht.	PEM® Part No.	Pkg. Qty.		Pkg.
Distorted-Thread Locking







				18-8 Stainless Steel

				M3 x 0.5 mm	7.4	0.97	Brinell 125, Rockwell B70	9.14	0.97	4.2	4.8	LAC-M3-1MD	5	000000000	000000


				M3 x 0.5 mm	7.4	1.38	Brinell 125, Rockwell B70	9.14	1.38	3.6	4.8	LAC-M3-2MD	5	000000000	00000