Chimney Nuts | McMaster-Carr

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Clip-On Nut Type

Panel Thickness

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Distance from Center of Hole to Edge

Screw Size

Clip-On Nut Shape

Finish

Corrosion-Resistant Coated

Thread Type

Thread Pitch

For Use With

RoHS

DFARS Specialty Metals

Exempt

Thread Fit

Metric Class 6H

Unified Standard Class 2B

Export Control Classification Number (ECCN)

EAR99

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Compliant

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Strong-Grip Clip-On Barrel Nuts Included

1/4"-20 with 0.531" from Hole Center to Edge (11 Pieces)

1/4"-20 with 0.531" from Hole Center to Edge (50 Pieces)

1/4"-20 with 0.781" from Hole Center to Edge (10 Pieces)

1/4"-20 with 0.781" from Hole Center to Edge (50 Pieces)

3/8"-16 with 0.75" from Hole Center to Edge (25 Pieces)

3/8"-16 with 0.75" from Hole Center to Edge (8 Pieces)

3/8"-16 with 1.125" from Hole Center to Edge (25 Pieces)

3/8"-16 with 1.125" from Hole Center to Edge (3 Pieces)

5/16"-18 with 0.562" from Hole Center to Edge (50 Pieces)

5/16"-18 with 0.562" from Hole Center to Edge (8 Pieces)

5/16"-18 with 0.843" from Hole Center to Edge (25 Pieces)

5/16"-18 with 0.843" from Hole Center to Edge (7 Pieces)

8-32 with 0.406" from Hole Center to Edge (4 Pieces)

10-24 with 0.468" from Hole Center to Edge (50 Pieces)

10-24 with 0.468" from Hole Center to Edge (7 Pieces)

Container Features

Compartmented

Lid Chart

Clip-On Hex Nuts Included

1/4"-20 with 0.5" from Hole Center to Edge (50 Pieces)

5/16"-18 with 0.563" from Hole Center to Edge (50 Pieces)

Low-Profile Clip-On Nuts for Tapping Screws Included

1/4" with 0.469" from Hole Center to Edge (12 Pieces)

1/4" with 0.5" from Hole Center to Edge (12 Pieces)

5/16" with 0.5" from Hole Center to Edge (12 Pieces)

Container Type

Metal Box

Plastic Box

Low-Profile Strong-Grip Clip-On Nuts for Tapping Screws Included

1/4" with 0.375" from Hole Center to Edge (15 Pieces)

1/4" with 0.375" from Hole Center to Edge (25 Pieces)

No. 6 with 0.375" from Hole Center to Edge (20 Pieces)

No. 6 with 0.375" from Hole Center to Edge (50 Pieces)

No. 8 with 0.375" from Hole Center to Edge (125 Pieces)

No. 8 with 0.375" from Hole Center to Edge (20 Pieces)

No. 8 with 0.625" from Hole Center to Edge (100 Pieces)

No. 10 with 0.344" from Hole Center to Edge (15 Pieces)

No. 10 with 0.344" from Hole Center to Edge (25 Pieces)

No. 10 with 0.563" from Hole Center to Edge (50 Pieces)

Number of Pieces

63 Products

Strong-Grip Clip-On Barrel Nuts

These clip-on nuts have a barrel with multiple threads for secure thread engagement. Also known as U-nuts, they squeeze both sides of thin panels for a tighter grip than J-nuts.

Zinc-Plated Steel—Zinc-plated steel nuts are corrosion resistant in wet environments.

Black Phosphate-Coated Steel—Black phosphate-coated steel nuts are mildly corrosion resistant in dry environments.

Corrosion-Resistant-Coated Steel—Corrosion-resistant-coated steel nuts hold up the best in wet and outdoor environments. The coating has been tested to extreme standards, including 720 hours of salt spray resistance.

	For Panel Thk.	Distance from Ctr. of Hole to Edge (A)	For Use With	Clip-On Nut Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M4 × 0.7 mm	0.6 mm to 3.8 mm	9.5 mm	Machine Screws	With Barrel	15	000000000	000000


	M4.2 × 1.4 mm	0.5 mm to 2 mm	10 mm	Tapping Screws	With Barrel	15	000000000	00000
	M4.2 × 1.4 mm	0.7 mm to 3.8 mm	9.5 mm	Tapping Screws	With Barrel	10	000000000	00000
	M4.2 × 1.4 mm	0.7 mm to 3.8 mm	15 mm	Tapping Screws	With Barrel	5	000000000	0000
	M5 × 0.8 mm	0.5 mm to 1.5 mm	11.5 mm	Machine Screws	With Barrel	10	000000000	00000
	M6 × 1 mm	0.5 mm to 2.3 mm	14.5 mm	Machine Screws	With Barrel	10	000000000	00000
	M6 × 1 mm	2 mm to 5 mm	14.5 mm	Machine Screws	With Barrel	5	000000000	00000
	M6 × 1 mm	3.4 mm to 6.3 mm	14.5 mm	Machine Screws	With Barrel	10	000000000	00000
	M8 × 1.25 mm	0.8 mm to 4 mm	14.5 mm	Machine Screws	With Barrel	5	000000000	0000
	M8 × 1.25 mm	0.8 mm to 4 mm	21 mm	Machine Screws	With Barrel	5	000000000	0000
	M8 × 1.25 mm	1.5 mm to 5.5 mm	14.5 mm	Machine Screws	With Barrel	20	000000000	00000


	M10 × 1.5 mm	1.5 mm to 5.5 mm	28 mm	Machine Screws	With Barrel	5	000000000	00000


	Black Phosphate-Coated Steel



			8-32	0.025" to 0.15"	0.378"	Machine Screws	With Barrel	25	000000000	00000


			8-32	0.079" to 0.118"	0.375"	Machine Screws	With Barrel	25	000000000	0000
			10-24	0.025" to 0.125"	0.468"	Machine Screws	With Barrel	25	000000000	00000
			10-24	0.14" to 0.16"	0.48"	Machine Screws	With Barrel	25	000000000	0000
			1/4"-20	0.025" to 0.15"	0.531"	Machine Screws	With Barrel	25	000000000	0000
			1/4"-20	0.025" to 0.15"	0.781"	Machine Screws	With Barrel	25	000000000	0000
			5/16"-18	0.025" to 0.15"	0.562"	Machine Screws	With Barrel	25	000000000	00000
			5/16"-18	0.025" to 0.15"	0.843"	Machine Screws	With Barrel	25	000000000	00000
			3/8"-16	0.05" to 0.2"	0.75"	Machine Screws	With Barrel	10	000000000	00000
			3/8"-16	0.05" to 0.2"	1.125"	Machine Screws	With Barrel	10	000000000	00000
			M4 × 0.7 mm	0.8 mm to 4 mm	13.5 mm	Machine Screws	With Barrel	25	000000000	00000


			M5 × 0.8 mm	0.6 mm to 3.8 mm	11 mm	Machine Screws	With Barrel	25	000000000	00000
			M5 × 0.8 mm	0.8 mm to 4 mm	15.8 mm	Machine Screws	With Barrel	25	000000000	00000
			M6 × 1 mm	0.8 mm to 4 mm	12 mm	Machine Screws	With Barrel	25	000000000	00000
			M6 × 1 mm	0.8 mm to 4 mm	13.5 mm	Machine Screws	With Barrel	25	000000000	00000
			M6 × 1 mm	0.8 mm to 4 mm	19.5 mm	Machine Screws	With Barrel	25	000000000	00000
			M6 × 1 mm	3.4 mm to 6.3 mm	13.5 mm	Machine Screws	With Barrel	10	000000000	0000
			M6 × 1 mm	4.3 mm to 5.6 mm	21 mm	Machine Screws	With Barrel	5	000000000	00000
			M6.3 × 1 mm	0.8 mm to 4 mm	13.5 mm	Machine Screws	With Barrel	25	000000000	00000
			M8 × 1.25 mm	0.8 mm to 4 mm	14.5 mm	Machine Screws	With Barrel	25	000000000	00000
			M8 × 1.25 mm	0.8 mm to 4.5 mm	20 mm	Machine Screws	With Barrel	25	000000000	00000


			M8 × 1.25 mm	1.7 mm to 5.5 mm	28.5 mm	Machine Screws	With Barrel	5	000000000	00000
			M8 × 1.25 mm	4 mm to 7 mm	21 mm	Machine Screws	With Barrel	10	000000000	00000
			M10 × 1.5 mm	1 mm to 6 mm	19 mm	Machine Screws	With Barrel	10	000000000	00000


			Corrosion-Resistant-Coated Steel



					M6 × 1 mm	0.5 mm to 4 mm	13 mm	Machine Screws	With Barrel	10	000000000	0000

Strong-Grip Clip-On Nuts for Tapping Screws

For a stronger grip than J-nuts, these nuts—also known as U-nuts—firmly squeeze thin panels from both sides. Use them as a fastening point for tapping screws. They’re mildly corrosion resistant in dry environments thanks to a black phosphate coating.

	For Panel Thk.	Distance from Ctr. of Hole to Edge (A)	For Use With	Clip-On Nut Type	Pkg. Qty.		Pkg.
Black Phosphate-Coated Steel



	No. 4	0.036" to 0.047"	0.2"	Tapping Screws	Low Profile	50	000000000	000000


	No. 6	0.025" to 0.04"	0.218"	Tapping Screws	Low Profile	25	000000000	0000
	No. 6	0.025" to 0.125"	0.375"	Tapping Screws	Low Profile	50	000000000	0000
	No. 8	0.025" to 0.04"	0.234"	Tapping Screws	Low Profile	25	000000000	00000
	No. 8	0.025" to 0.04"	0.328"	Tapping Screws	Low Profile	25	000000000	00000
	No. 8	0.025" to 0.04"	0.515"	Tapping Screws	Low Profile	25	000000000	0000
	No. 8	0.025" to 0.125"	0.375"	Tapping Screws	Low Profile	25	000000000	0000
	No. 8	0.025" to 0.15"	0.625"	Tapping Screws	Low Profile	50	000000000	0000
	No. 8	0.045" to 0.062"	0.234"	Tapping Screws	Low Profile	25	000000000	0000
	No. 8	0.045" to 0.062"	0.515"	Tapping Screws	Low Profile	25	000000000	00000
	No. 8	0.05" to 0.08"	0.296"	Tapping Screws	Low Profile	25	000000000	00000


	No. 8	0.11" to 0.187"	0.312"	Tapping Screws	Low Profile	25	000000000	0000
	No. 10	0.025" to 0.04"	0.25"	Tapping Screws	Low Profile	25	000000000	00000
	No. 10	0.025" to 0.125"	0.344"	Tapping Screws	Low Profile	25	000000000	0000
	No. 10	0.025" to 0.15"	0.563"	Tapping Screws	Low Profile	50	000000000	00000
	No. 10	0.045" to 0.062"	0.359"	Tapping Screws	Low Profile	25	000000000	00000
	No. 10	0.045" to 0.062"	0.562"	Tapping Screws	Low Profile	25	000000000	00000
	No. 10	0.102" to 0.125"	0.406"	Tapping Screws	Low Profile	25	000000000	0000
	1/4"	0.025" to 0.125"	0.375"	Tapping Screws	Low Profile	25	000000000	00000

Strong-Grip Clip-On Nuts

Clip-On Hex

Nut

Clip-On

Square Nut

Also known as U-nuts, these nuts squeeze both sides of thin panels for a tighter grip than J-nuts. The hex- or square-shaped barrel gives your wrench a spot to grip, so you can keep these nuts in place as you tighten a machine screw. For secure fastening, multiple threads in the barrel engage with your screw.

Zinc-Plated Steel—Zinc-plated steel nuts are corrosion resistant in wet environments.

Black Phosphate-Coated Steel—Black phosphate-coated steel nuts are mildly corrosion resistant in dry environments.

	For Panel Thk.	Distance from Ctr. of Hole to Edge (A)	For Use With	Clip-On Nut Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	5/16"-18	0.096" to 0.141"	0.5"	Machine Screws	With Square Nut	5	000000000	00000


	Black Phosphate-Coated Steel



			1/4"-20	0.05" to 0.07"	0.375"	Machine Screws	With Hex Nut	10	000000000	0000


			5/16"-18	0.096" to 0.141"	0.5"	Machine Screws	With Square Nut	5	000000000	0000

Clip-On Nut Assortments


48 Pieces	70 Pieces	125 Pieces	965 Pieces

Keep a variety of clip-on nuts on hand to create fastening points for screws. Simply slide these nuts onto the edges of thin panels.

Strong-grip nuts squeeze both sides of the panel for a tight grip. They’re also known as U-nuts.

Low-Profile Clip-On Nut—Low-profile nuts are for low-clearance applications.

Clip-On Barrel Nut—Barrel nuts have multiple threads for secure thread engagement.

	Includes	For Panel Thk.	Container Type	Clip-On Nut Type		Each
Black Phosphate-Coated Steel



	48	12 Low-Profile Strong-Grip Clip-On Nuts (1/4"-20) 36 Low-Profile Clip-On Nuts For Tapping Screws (1/4" to 5/16")	0.028" to 0.125"	Plastic Box	Low Profile	000000000	000000


	70	70 Low-Profile Strong-Grip Clip-On Nuts For Tapping Screws (No. 6 to 1/4")	0.025" to 0.125"	Plastic Box	Low Profile	000000000	00000
	125	125 Strong-Grip Clip-On Barrel Nuts (8-32 to 3/8"-16, M4 to M10)	0.025" to 0.248"	Plastic Box	With Barrel	000000000	000000
	965	100 Clip-On Hex Nuts (1/4"-20 to 5/16"-18) 475 Strong-Grip Clip-On Barrel Nuts (10-24 to 3/8"-16, M6 to M10) 15 Strong-Grip Clip-On Barrel Nuts For Tapping Screws (No. 10) 375 Low-Profile Strong-Grip Clip-On Nuts For Tapping Screws (No. 6 to 1/4")	0.025" to 0.236"	Metal Box	Low Profile, With Barrel, With Hex Nut	000000000	000000