Flange Jam Nuts | McMaster-Carr

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Unified Standard Class 2B

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124 Products

Thumb Nut Grip Type

Knurled Head

Get a good grip, even with oily fingers

118 products

Hex Head

Twist on by hand, then crank with a wrench for an extra-tight fit

6 products

Performance

High Torque

Fasten with a tool to apply extra torque and achieve an extra-tight fit

6 products

Flanged Knurled-Head Thumb Nuts

The slip-resistant head is easy to grip, while the flange distributes pressure evenly across the mounting surface without the need for a separate washer. These nuts are often used to secure screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts.

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

Passivated 18-8 Stainless Steel—With an added layer of protection, these nuts stand up to strong acids and other harsh chemicals.

Highly-Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant thumb nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

		Collar
	Thread Size	Dia.	Ht.	Head Dia.	Ht.	Threading	Thread Dp.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		0-80	5/32"	1/8"	7/32"	1/4"	Fully Threaded	—	1	000000000	00000


		1-72	5/32"	1/8"	7/32"	1/4"	Fully Threaded	—	1	000000000	0000
		2-56	3/16"	1/8"	1/4"	1/4"	Fully Threaded	—	1	000000000	0000
		3-48	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	000000000	0000
		4-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	000000000	0000
		4-40	1/4"	1/8"	5/16"	5/16"	Partially Threaded	7/32"	1	000000000	0000
		5-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	000000000	0000
		6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	000000000	0000
		8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	000000000	0000
		8-32	3/8"	5/32"	7/16"	3/8"	Partially Threaded	1/4"	1	000000000	0000
		10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000


		10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000
		12-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000
		1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	000000000	0000
		1/4"-20	15/32"	7/32"	9/16"	1/2"	Partially Threaded	5/16"	1	000000000	0000
		1/4"-28	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	000000000	0000
		5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	000000000	0000
		5/16"-24	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	000000000	0000
		3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	000000000	0000
		3/8"-24	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	000000000	0000
		7/16"-14	11/16"	5/16"	1"	17/32"	Fully Threaded	—	1	000000000	0000


		7/16"-20	11/16"	5/16"	1"	17/32"	Fully Threaded	—	1	000000000	0000
		1/2"-13	3/4"	3/8"	1"	5/8"	Fully Threaded	—	1	000000000	0000
		M1.6 × 0.35 mm	4 mm	4 mm	6 mm	6 mm	Fully Threaded	—	1	000000000	0000
		M1.6 × 0.35 mm	4 mm	4 mm	8 mm	6 mm	Fully Threaded	—	1	000000000	0000
		M2 × 0.4 mm	4 mm	2 mm	6 mm	4 mm	Fully Threaded	—	1	000000000	0000
		M2 × 0.4 mm	4 mm	4 mm	8 mm	6 mm	Fully Threaded	—	1	000000000	0000
		M2.5 × 0.45 mm	4 mm	5 mm	12 mm	7 mm	Fully Threaded	—	1	000000000	0000
		M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	—	1	000000000	0000
		M2.5 × 0.45 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	000000000	0000
		M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	000000000	0000


		M3 × 0.5 mm	6 mm	5 mm	16 mm	8 mm	Fully Threaded	—	1	000000000	0000
		M3.5 × 0.6 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	000000000	0000
		M4 × 0.7 mm	8 mm	6 mm	12 mm	10 mm	Fully Threaded	—	1	000000000	0000
		M4 × 0.7 mm	8 mm	6 mm	20 mm	10 mm	Fully Threaded	—	1	000000000	00000
		M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	000000000	0000
		M5 × 0.8 mm	10 mm	7.5 mm	16 mm	12 mm	Fully Threaded	—	1	000000000	0000
		M5 × 0.8 mm	10 mm	7.5 mm	24 mm	12 mm	Fully Threaded	—	1	000000000	00000
		M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	000000000	0000
		M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	000000000	0000
		M6 × 1 mm	12 mm	10 mm	20 mm	15 mm	Fully Threaded	—	1	000000000	00000


		M6 × 1 mm	12 mm	10 mm	24 mm	15 mm	Fully Threaded	—	1	000000000	00000
		M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	—	1	000000000	0000
		M8 × 1.25 mm	16 mm	12 mm	24 mm	18 mm	Fully Threaded	—	1	000000000	00000
		M8 × 1.25 mm	16 mm	12 mm	31.8 mm	18 mm	Fully Threaded	—	1	000000000	00000
		M10 × 1.5 mm	20 mm	15 mm	26 mm	23 mm	Fully Threaded	—	1	000000000	00000
		M10 × 1.5 mm	20 mm	15 mm	31.8 mm	23 mm	Fully Threaded	—	1	000000000	00000
		M12 × 1.75 mm	24 mm	20 mm	31.8 mm	30 mm	Fully Threaded	—	1	000000000	00000


		Black-Oxide 18-8 Stainless Steel



		2-56	3/16"	1/8"	1/4"	1/4"	Fully Threaded	—	1	000000000	0000


		4-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	000000000	0000
		6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	000000000	0000
		8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	000000000	0000
		10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000
		10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000
		1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	000000000	0000
		5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	000000000	0000
		3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	000000000	0000
		M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	—	1	000000000	0000
		M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	000000000	0000


		M3.5 × 0.6 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	000000000	0000
		M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	000000000	0000
		M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	000000000	0000
		M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	000000000	0000
		M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	—	1	000000000	00000


		Passivated 18-8 Stainless Steel



				6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	000000000	0000


				8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	000000000	0000
				10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000
				10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	0000
				1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	000000000	0000
				1/4"-28	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	000000000	0000
				5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	000000000	0000
				3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	000000000	0000
				3/8"-24	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	000000000	0000
				7/16"-14	11/16"	5/16"	1"	17/32"	Fully Threaded	—	1	000000000	0000
				1/2"-13	3/4"	3/8"	1"	5/8"	Fully Threaded	—	1	000000000	0000


				M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	—	1	000000000	0000
				M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	000000000	0000
				M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	000000000	0000
				M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	000000000	0000
				M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	000000000	0000
				M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	—	1	000000000	00000


				Highly-Corrosion-Resistant 316 Stainless Steel



						4-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	000000000	00000


						6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	000000000	00000
						8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	000000000	00000
						10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	00000
						10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	000000000	00000
						1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	000000000	00000
5/16"-18						17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	000000000	00000
3/8"-16	5/8"					1/4"	3/4"	15/32"	Fully Threaded	—	1	000000000	00000
1/2"-13	13/16"					1/4"	1"	1/2"	Fully Threaded	—	1	000000000	00000

Brass

Brass—With a warm, polished look, these nuts are often chosen for their appearance. Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments. It is also softer than other metals, so it's easier to thread together.

Zinc-Plated Brass—The zinc plating offers better corrosion resistance than plain brass to stand up to solvents and mild chemicals.

		Collar
	Thread Size	Dia.	Ht.	Head Dia.	Ht.	Threading	Pkg. Qty.		Pkg.
Brass



		0-80	5/32"	1/8"	7/32"	1/4"	Fully Threaded	1	000000000	00000


		1-72	3/16"	1/8"	1/4"	1/4"	Fully Threaded	1	000000000	0000
		2-56	3/16"	1/8"	1/4"	1/4"	Fully Threaded	1	000000000	0000
		3-48	1/4"	1/8"	5/16"	1/4"	Fully Threaded	1	000000000	0000
		4-40	5/16"	9/64"	3/8"	1/4"	Fully Threaded	25	000000000	00000
		5-40	11/32"	5/32"	3/8"	9/32"	Fully Threaded	1	000000000	0000
		6-32	5/16"	9/64"	3/8"	1/4"	Fully Threaded	25	000000000	00000
		8-32	3/8"	3/16"	7/16"	5/16"	Fully Threaded	25	000000000	00000
		10-24	7/16"	13/64"	1/2"	21/64"	Fully Threaded	10	000000000	0000
		10-32	7/16"	13/64"	1/2"	21/64"	Fully Threaded	10	000000000	0000
		12-24	1/2"	13/64"	9/16"	11/32"	Fully Threaded	10	000000000	00000


		1/4"-20	9/16"	7/32"	5/8"	3/8"	Fully Threaded	10	000000000	00000
		1/4"-28	15/32"	7/32"	9/16"	3/8"	Fully Threaded	1	000000000	0000
		5/16"-18	39/64"	15/64"	11/16"	13/32"	Fully Threaded	10	000000000	00000
		3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	1	000000000	0000


		Zinc-Plated Brass



				8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	1	000000000	00000


				10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	1	000000000	00000
				10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	1	000000000	00000
				1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	1	000000000	00000
				5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	1	000000000	00000
				3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	1	000000000	00000
				M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	1	000000000	0000
				M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	1	000000000	0000
				M3.5 × 0.6 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	1	000000000	0000
				M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	1	000000000	0000
				M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	1	000000000	0000


				M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	1	000000000	0000
				M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	1	000000000	0000

Hex-Head Thumb Nuts

Apply extra torque to these nuts to prevent accidental loosening. Twist them on by hand, then crank with a wrench for a tight fit. The flange distributes pressure evenly across the mounting surface without the need for a separate washer. These nuts are often used to secure screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts.

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Collar
	Thread Size	Dia.	Ht.	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		4-40	1/4"	1/8"	5/16"	1/4"	1	000000000	00000


		6-32	11/32"	5/32"	3/8"	9/32"	1	000000000	0000
		8-32	3/8"	5/32"	7/16"	9/32"	1	000000000	0000
		10-32	13/32"	3/16"	1/2"	11/32"	1	000000000	0000
		1/4"-20	15/32"	7/32"	9/16"	3/8"	1	000000000	0000
		5/16"-18	17/32"	7/32"	5/8"	13/32"	1	000000000	0000