Grade G Nuts | McMaster-Carr

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Fastener Strength Grade/Class

ASME Grade G

System of Measurement

Thread Size

Nut Type

Finish

Zinc Yellow-Chromate Plated

Locking Type

Distorted Thread

Nylon Insert

Material

Steel

Fastener Strength Rating

Flange Diameter

Performance

Width

Height

Thread Direction

Thread Spacing

Hex Nut Profile

DFARS Specialty Metals

Thread Type

Flange Thickness

REACH

Thread Fit

Unified Standard Class 2B

Export Control Classification Number (ECCN)

Drive Style

RoHS

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Color

Black

Insert Maximum Temperature

250° F

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49 Products

Distorted-Thread Flange Nuts

The strongest hold of all the flange nuts we offer, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out due to high vibration, but they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch, so they are not reusable. Nuts have a flange that distributes pressure evenly across the mounting surface without the need for a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. Also known as collar nuts.

High-Strength Steel

Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, and motors. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Black Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that withstands occasional exposure to moisture.

				Flange
	Thread Size	Wd.	Ht.	Dia.	Thk.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		1/4"-20	7/16"	19/64"	9/16"	0.04"	ASME Grade G	50	90949A212	000000


		1/4"-28	7/16"	19/64"	9/16"	0.04"	ASME Grade G	50	90949A213	00000
		5/16"-18	1/2"	23/64"	11/16"	0.05"	ASME Grade G	25	90949A214	00000
		5/16"-24	1/2"	23/64"	11/16"	0.05"	ASME Grade G	25	90949A215	00000
		3/8"-16	9/16"	27/64"	13/16"	0.06"	ASME Grade G	25	90949A216	00000
		3/8"-24	9/16"	27/64"	13/16"	0.06"	ASME Grade G	25	90949A217	00000
		1/2"-13	3/4"	9/16"	1 1/16"	0.08"	ASME Grade G	10	90949A218	00000
		1/2"-20	3/4"	9/16"	1 1/16"	0.08"	ASME Grade G	10	90949A219	00000
		5/8"-11	15/16"	11/16"	1 21/64"	0.1"	ASME Grade G	10	90949A221	00000
		5/8"-18	15/16"	11/16"	1 21/64"	0.1"	ASME Grade G	10	90949A222	00000
		3/4"-10	1 1/8"	13/16"	1 37/64"	0.11"	ASME Grade G	5	90949A223	00000


		Black-Oxide Steel



				1/4"-20	7/16"	19/64"	9/16"	0.04"	ASME Grade G	50	90949A224	00000


				1/4"-28	7/16"	19/64"	9/16"	0.04"	ASME Grade G	50	90949A225	00000
				5/16"-18	1/2"	23/64"	11/16"	0.05"	ASME Grade G	25	90949A226	00000
				5/16"-24	1/2"	23/64"	11/16"	0.05"	ASME Grade G	25	90949A227	00000
				3/8"-16	9/16"	27/64"	13/16"	0.06"	ASME Grade G	25	90949A228	00000
				3/8"-24	9/16"	27/64"	13/16"	0.06"	ASME Grade G	25	90949A229	00000
				1/2"-13	3/4"	9/16"	1 1/16"	0.08"	ASME Grade G	10	90949A231	00000
				1/2"-20	3/4"	9/16"	1 1/16"	0.08"	ASME Grade G	10	90949A232	00000
				5/8"-11	15/16"	11/16"	1 21/64"	0.1"	ASME Grade G	10	90949A233	00000
				5/8"-18	15/16"	11/16"	1 21/64"	0.1"	ASME Grade G	10	90949A234	00000
				3/4"-10	1 1/8"	13/16"	1 37/64"	0.11"	ASME Grade G	5	90949A235	00000


				Black Phosphate-Coated Steel



						1/4"-20	7/16"	19/64"	9/16"	0.04"	ASME Grade G	100	90949A016	0000


						1/4"-28	7/16"	19/64"	9/16"	0.04"	ASME Grade G	100	90949A018	0000
						5/16"-18	1/2"	23/64"	11/16"	0.05"	ASME Grade G	100	90949A025	00000
						5/16"-24	1/2"	23/64"	11/16"	0.05"	ASME Grade G	100	90949A029	00000
						3/8"-16	9/16"	27/64"	13/16"	0.06"	ASME Grade G	50	90949A031	00000
						3/8"-24	9/16"	27/64"	13/16"	0.06"	ASME Grade G	25	90949A211	00000
						1/2"-13	3/4"	9/16"	1 1/16"	0.08"	ASME Grade G	25	90949A033	00000
						1/2"-20	3/4"	9/16"	1 1/16"	0.08"	ASME Grade G	25	90949A037	00000
						5/8"-11	15/16"	11/16"	1 21/64"	0.1"	ASME Grade G	10	90949A110	00000
						5/8"-18	15/16"	11/16"	1 21/64"	0.1"	ASME Grade G	10	90949A112	0000
						3/4"-10	1 1/8"	53/64"	1 37/64"	0.11"	ASME Grade G	10	90949A115	00000


						3/4"-16	1 1/8"	53/64"	1 37/64"	0.11"	ASME Grade G	10	90949A119	00000
						7/8"-9	1 5/16"	51/64"	1 3/4"	0.12"	ASME Grade G	5	90949A124	00000
						7/8"-14	1 5/16"	51/64"	1 3/4"	0.12"	ASME Grade G	5	90949A127	00000
						1"-8	1 1/2"	57/64"	2 1/16"	0.13"	ASME Grade G	5	90949A133	00000
						1"-14	1 1/2"	57/64"	2 1/16"	0.13"	ASME Grade G	5	90949A135	00000

Nylon-Insert Flange Nuts

A nylon insert grips the screw for a stronger hold than a serrated flange, without damaging threads or marring the surface of your material. However, the insert may become brittle if exposed to high temperatures. These nuts have a flange that distributes pressure evenly across the mounting surface, so you don't need a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can reuse them a handful of times, but their holding power will decrease with each use. Also known as collar nuts.

High-Strength Steel

Image of Product. Front orientation. Flange Nuts. Nylon-Insert Flange Nuts.

				Flange
	Thread Size	Wd.	Ht.	Dia.	Thk.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



		1/4"-20	7/16"	19/64"	0.56"	0.04"	ASME Grade G	250	100	92018A210	00000


		5/16"-18	1/2"	11/32"	0.68"	0.05"	ASME Grade G	250	50	92018A320	0000
		3/8"-16	9/16"	13/32"	0.81"	0.06"	ASME Grade G	250	50	92018A430	00000
		1/2"-13	3/4"	35/64"	1.07"	0.08"	ASME Grade G	250	25	92018A540	00000
		5/8"-11	15/16"	43/64"	1.33"	0.1"	ASME Grade G	250	10	92018A650	00000


		Black-Oxide Steel



				1/4"-20	7/16"	19/64"	0.56"	0.04"	ASME Grade G	250	100	92018A112	00000


				5/16"-18	1/2"	23/64"	0.68"	0.05"	ASME Grade G	250	100	92018A114	00000
				3/8"-16	9/16"	27/64"	0.81"	0.06"	ASME Grade G	250	50	92018A111	00000
				1/2"-13	3/4"	35/64"	1.07"	0.08"	ASME Grade G	250	50	92018A113	00000
				5/8"-11	15/16"	11/16"	1.33"	0.1"	ASME Grade G	250	25	92018A115	00000
				3/4"-10	1 1/8"	13/16"	1.585"	0.11"	ASME Grade G	250	10	92018A116	00000