Flange Jam Nuts | McMaster-Carr

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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	95150A101	00000


		1-72	5/32"	1/8"	7/32"	1/4"	Fully Threaded	—	1	95150A102	0000
		2-56	3/16"	1/8"	1/4"	1/4"	Fully Threaded	—	1	95150A110	0000
		3-48	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	95150A103	0000
		4-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	95150A120	0000
		4-40	1/4"	1/8"	5/16"	5/16"	Partially Threaded	7/32"	1	95150A121	0000
		5-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	95150A104	0000
		6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	95150A130	0000
		8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	95150A140	0000
		8-32	3/8"	5/32"	7/16"	3/8"	Partially Threaded	1/4"	1	95150A123	0000
		10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A150	0000


		10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A160	0000
		12-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A105	0000
		1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	95150A170	0000
		1/4"-20	15/32"	7/32"	9/16"	1/2"	Partially Threaded	5/16"	1	95150A124	0000
		1/4"-28	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	95150A106	0000
		5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	95150A180	0000
		5/16"-24	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	95150A107	0000
		3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	95150A190	0000
		3/8"-24	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	95150A108	0000
		7/16"-14	11/16"	5/16"	1"	17/32"	Fully Threaded	—	1	95150A109	0000


		7/16"-20	11/16"	5/16"	1"	17/32"	Fully Threaded	—	1	95150A112	0000
		1/2"-13	3/4"	3/8"	1"	5/8"	Fully Threaded	—	1	95150A113	0000
		M1.6 × 0.35 mm	4 mm	4 mm	6 mm	6 mm	Fully Threaded	—	1	96445A260	0000
		M1.6 × 0.35 mm	4 mm	4 mm	8 mm	6 mm	Fully Threaded	—	1	96445A270	0000
		M2 × 0.4 mm	4 mm	2 mm	6 mm	4 mm	Fully Threaded	—	1	96445A101	0000
		M2 × 0.4 mm	4 mm	4 mm	8 mm	6 mm	Fully Threaded	—	1	96445A280	0000
		M2.5 × 0.45 mm	4 mm	5 mm	12 mm	7 mm	Fully Threaded	—	1	96445A290	0000
		M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	—	1	96445A320	0000
		M2.5 × 0.45 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	96445A102	0000
		M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	96445A330	0000


		M3 × 0.5 mm	6 mm	5 mm	16 mm	8 mm	Fully Threaded	—	1	96445A310	0000
		M3.5 × 0.6 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	96445A340	0000
		M4 × 0.7 mm	8 mm	6 mm	12 mm	10 mm	Fully Threaded	—	1	96445A111	0000
		M4 × 0.7 mm	8 mm	6 mm	20 mm	10 mm	Fully Threaded	—	1	96445A112	00000
		M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	96445A350	0000
		M5 × 0.8 mm	10 mm	7.5 mm	16 mm	12 mm	Fully Threaded	—	1	96445A113	0000
		M5 × 0.8 mm	10 mm	7.5 mm	24 mm	12 mm	Fully Threaded	—	1	96445A114	00000
		M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	96445A360	0000
		M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	96445A370	0000
		M6 × 1 mm	12 mm	10 mm	20 mm	15 mm	Fully Threaded	—	1	96445A115	00000


		M6 × 1 mm	12 mm	10 mm	24 mm	15 mm	Fully Threaded	—	1	96445A116	00000
		M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	—	1	96445A380	0000
		M8 × 1.25 mm	16 mm	12 mm	24 mm	18 mm	Fully Threaded	—	1	96445A117	00000
		M8 × 1.25 mm	16 mm	12 mm	31.8 mm	18 mm	Fully Threaded	—	1	96445A118	00000
		M10 × 1.5 mm	20 mm	15 mm	26 mm	23 mm	Fully Threaded	—	1	96445A119	00000
		M10 × 1.5 mm	20 mm	15 mm	31.8 mm	23 mm	Fully Threaded	—	1	96445A121	00000
		M12 × 1.75 mm	24 mm	20 mm	31.8 mm	30 mm	Fully Threaded	—	1	96445A122	00000


		Black-Oxide 18-8 Stainless Steel



		2-56	3/16"	1/8"	1/4"	1/4"	Fully Threaded	—	1	95150A147	0000


		4-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	95150A148	0000
		6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	95150A149	0000
		8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	95150A151	0000
		10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A152	0000
		10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A153	0000
		1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	95150A154	0000
		5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	95150A155	0000
		3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	95150A156	0000
		M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	—	1	96445A110	0000
		M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	96445A130	0000


		M3.5 × 0.6 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	96445A150	0000
		M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	96445A170	0000
		M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	96445A190	0000
		M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	96445A220	0000
		M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	—	1	96445A240	00000


		Passivated 18-8 Stainless Steel



				6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	95150A139	0000


				8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	95150A141	0000
				10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A142	0000
				10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	95150A143	0000
				1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	95150A144	0000
				1/4"-28	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	95150A131	0000
				5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	95150A145	0000
				3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	95150A146	0000
				3/8"-24	5/8"	1/4"	3/4"	15/32"	Fully Threaded	—	1	95150A133	0000
				7/16"-14	11/16"	5/16"	1"	17/32"	Fully Threaded	—	1	95150A134	0000
				1/2"-13	3/4"	3/8"	1"	5/8"	Fully Threaded	—	1	95150A136	0000


				M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	—	1	96445A120	0000
				M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	—	1	96445A140	0000
				M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	—	1	96445A180	0000
				M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	96445A210	0000
				M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	—	1	96445A230	0000
				M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	—	1	96445A250	00000


				Highly Corrosion-Resistant 316 Stainless Steel



						4-40	1/4"	1/8"	5/16"	1/4"	Fully Threaded	—	1	99937A101	00000


						6-32	11/32"	5/32"	3/8"	9/32"	Fully Threaded	—	1	99937A102	00000
						8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	—	1	99937A103	00000
						10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	99937A104	00000
						10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	—	1	99937A105	00000
						1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	—	1	99937A106	00000
5/16"-18						17/32"	7/32"	5/8"	13/32"	Fully Threaded	—	1	99937A107	00000
3/8"-16	5/8"					1/4"	3/4"	15/32"	Fully Threaded	—	1	99937A108	00000
1/2"-13	13/16"					1/4"	1"	1/2"	Fully Threaded	—	1	99937A109	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	92741A101	00000


		1-72	3/16"	1/8"	1/4"	1/4"	Fully Threaded	1	92741A201	0000
		2-56	3/16"	1/8"	1/4"	1/4"	Fully Threaded	1	92741A102	0000
		3-48	1/4"	1/8"	5/16"	1/4"	Fully Threaded	1	92741A202	0000
		4-40	5/16"	9/64"	3/8"	1/4"	Fully Threaded	25	92741A100	00000
		5-40	11/32"	5/32"	3/8"	9/32"	Fully Threaded	1	92741A203	0000
		6-32	5/16"	9/64"	3/8"	1/4"	Fully Threaded	25	92741A110	00000
		8-32	3/8"	3/16"	7/16"	5/16"	Fully Threaded	25	92741A120	00000
		10-24	7/16"	13/64"	1/2"	21/64"	Fully Threaded	10	92741A130	0000
		10-32	7/16"	13/64"	1/2"	21/64"	Fully Threaded	10	92741A140	0000
		12-24	1/2"	13/64"	9/16"	11/32"	Fully Threaded	10	92741A150	00000


		1/4"-20	9/16"	7/32"	5/8"	3/8"	Fully Threaded	10	92741A160	00000
		1/4"-28	15/32"	7/32"	9/16"	3/8"	Fully Threaded	1	92741A204	0000
		5/16"-18	39/64"	15/64"	11/16"	13/32"	Fully Threaded	10	92741A170	00000
		3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	1	92741A205	0000


		Zinc-Plated Brass



				8-32	3/8"	5/32"	7/16"	9/32"	Fully Threaded	1	92741A209	00000


				10-24	13/32"	3/16"	1/2"	11/32"	Fully Threaded	1	92741A210	00000
				10-32	13/32"	3/16"	1/2"	11/32"	Fully Threaded	1	92741A211	00000
				1/4"-20	15/32"	7/32"	9/16"	3/8"	Fully Threaded	1	92741A212	00000
				5/16"-18	17/32"	7/32"	5/8"	13/32"	Fully Threaded	1	92741A213	00000
				3/8"-16	5/8"	1/4"	3/4"	15/32"	Fully Threaded	1	92741A214	00000
				M2.5 × 0.45 mm	5 mm	3 mm	6 mm	6 mm	Fully Threaded	1	96115A410	0000
				M3 × 0.5 mm	6 mm	3 mm	8 mm	6 mm	Fully Threaded	1	96115A420	0000
				M3.5 × 0.6 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	1	96115A480	0000
				M4 × 0.7 mm	9 mm	4 mm	10 mm	7 mm	Fully Threaded	1	96115A440	0000
				M5 × 0.8 mm	11 mm	5 mm	13 mm	9 mm	Fully Threaded	1	96115A450	0000


				M6 × 1 mm	12 mm	5 mm	13 mm	9 mm	Fully Threaded	1	96115A460	0000
				M8 × 1.25 mm	16 mm	6 mm	19 mm	12 mm	Fully Threaded	1	96115A470	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	94365A340	00000


		6-32	11/32"	5/32"	3/8"	9/32"	1	94365A350	0000
		8-32	3/8"	5/32"	7/16"	9/32"	1	94365A360	0000
		10-32	13/32"	3/16"	1/2"	11/32"	1	94365A380	0000
		1/4"-20	15/32"	7/32"	9/16"	3/8"	1	94365A390	0000
		5/16"-18	17/32"	7/32"	5/8"	13/32"	1	94365A400	0000