Extra-Wide Thin Nuts | McMaster-Carr

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Thin Heavy

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Nut Type

Material

Width

Fastener Strength Grade/Class

Finish

Corrosion-Resistant Coated

Thread Direction

Locking Type

Thread Type

Performance

Specifications Met

Thread Fit

Unified Standard Class 2B

Unified Standard Class 3B

Fastener Strength Rating

RoHS

Compliant with Exemptions

Thread Spacing

Drive Style

DFARS Specialty Metals

REACH

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

Yes

Export Control Classification Number (ECCN)

EAR99

Insert Maximum Temperature

Color

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109 Products

Thin-Heavy-Profile Nylon-Insert Locknuts

About half the height of standard-profile locknuts and 10% wider, these fit in spaces with low clearance and handle heavier loads by distributing them over a larger area. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

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

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F		Each
Black-Phosphate-Coated Steel



	1 1/4"-12	2"	1 7/64"	ASTM Grade C	250	93126A110	00000


	1 1/2"-12	2 3/8"	1 5/16"	ASTM Grade C	250	93126A120	00000
	1 3/4"-12	2 3/4"	1 15/32"	ASTM Grade C	250	93126A130	00000
	2"-12	3 1/8"	1 43/64"	ASTM Grade C	250	93126A140	00000
	2 1/4"-12	3 1/2"	1 15/16"	ASTM Grade C	250	93126A150	00000
	2 1/2"-12	4"	2 3/16"	ASTM Grade C	250	93126A160	00000
	2 3/4"-12	4"	2 3/16"	ASTM Grade C	250	93126A170	00000
	3"-12	4 1/2"	2 41/64"	ASTM Grade C	250	93126A210	000000


	Steel



			1 1/8"-12	1 7/8"	1"	ASTM Grade C	250	93126A180	00000


			1 3/8"-12	2 13/64"	1 3/16"	ASTM Grade C	250	93126A190	00000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

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

Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	1/2"	9/32"	250	100	90652A029	000000


	5/16"-18	9/16"	5/16"	250	100	90652A030	00000
	3/8"-16	11/16"	13/32"	250	50	90652A040	00000
	1/2"-13	7/8"	17/32"	250	25	90652A050	00000
	5/8"-11	1 1/16"	39/64"	250	10	90652A055	00000
	3/4"-10	1 1/4"	45/64"	250	10	90652A060	00000
	1"-8	1 5/8"	57/64"	250	1	90652A065	0000
	1 1/4"-7	2"	1 7/64"	250	1	90652A070	00000


	Black-Corrosion-Resistant-Coated Steel



			1/4"-20	1/2"	9/32"	250	5	90652A810	0000


			5/16"-18	9/16"	5/16"	250	5	90652A820	0000
			3/8"-16	11/16"	13/32"	250	1	90652A830	0000
			1/2"-13	7/8"	17/32"	250	1	90652A840	0000

Corrosion-Resistant Stainless Steel

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

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

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	1/2"	9/32"	250	25	90098A110	000000


	5/16"-18	9/16"	5/16"	250	20	90098A115	00000
	3/8"-16	11/16"	13/32"	250	10	90098A120	00000
	1/2"-13	7/8"	17/32"	250	1	90098A130	0000
	5/8"-11	1 1/16"	5/8"	250	1	90098A035	0000
	3/4"-10	1 1/4"	45/64"	250	1	90098A036	00000
	1"-8	1 5/8"	59/64"	250	1	90098A135	00000


	316 Stainless Steel



			3/8"-16	11/16"	13/32"	250	1	94530A113	0000


			1/2"-13	7/8"	17/32"	250	1	94530A115	0000
			5/8"-11	1 1/16"	39/64"	250	1	94530A117	0000
			3/4"-10	1 1/4"	45/64"	250	1	94530A119	00000

Thin-Heavy-Profile Hex Nuts

About half the height of standard-profile hex nuts and 10% wider, these fit in spaces with low clearance and handle heavier loads by distributing them over a larger area. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Extreme-Strength Steel

These nuts are about 20% stronger than high-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

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

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1/4"-20	1/2"	11/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	91879A029	000000


	5/16"-18	9/16"	13/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	91879A030	00000
	3/8"-16	11/16"	15/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	91879A031	00000
	1/2"-13	7/8"	19/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	91879A032	00000
	5/8"-11	1 1/16"	23/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	91879A033	00000
	3/4"-10	1 1/4"	27/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	91879A034	00000


	Steel



			1/4"-20	1/2"	11/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A130	0000


			3/8"-16	11/16"	15/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	95010A140	00000
			7/16"-14	3/4"	17/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A145	0000
			1/2"-13	7/8"	19/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	5	95010A150	00000
			5/8"-11	1 1/16"	23/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A160	0000
			3/4"-10	1 1/4"	27/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A165	0000
			7/8"-9	1 7/16"	31/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A170	0000
			1"-8	1 5/8"	35/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A175	0000
			1 1/8"-7	1 13/16"	39/64"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A180	0000
			1 1/4"-7	2"	23/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A190	0000
			1 3/8"-6	2 3/16"	25/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A320	0000


			1 1/2"-6	2 3/8"	27/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A210	0000
			1 3/4"-5	2 3/4"	31/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A220	00000
			2"-4 1/2	3 1/8"	1 3/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A240	00000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

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

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Black-Oxide Steel



	1/4"-20	1/2"	11/64"	—	25	91015A029	00000


	5/16"-18	9/16"	13/64"	—	25	91015A030	0000
	3/8"-16	11/16"	15/64"	—	25	91015A031	00000
	7/16"-14	3/4"	17/64"	—	25	91015A032	00000
	1/2"-13	7/8"	19/64"	—	10	91015A033	0000
	5/8"-11	1 1/16"	23/64"	—	10	91015A035	0000
	3/4"-10	1 1/4"	27/64"	—	5	91015A036	0000
	7/8"-9	1 7/16"	31/64"	—	5	91015A037	00000
	1"-8	1 5/8"	35/64"	—	1	91015A038	0000


	Steel



			1/4"-20	1/2"	11/64"	SAE Grade 2	100	90502A029	0000


			5/16"-18	9/16"	13/64"	SAE Grade 2	100	90502A030	0000
			3/8"-16	11/16"	15/64"	SAE Grade 2	100	90502A031	00000
			1/2"-13	7/8"	19/64"	SAE Grade 2	50	90502A033	00000
			5/8"-11	1 1/16"	23/64"	SAE Grade 2	25	90502A410	00000
			3/4"-10	1 1/4"	27/64"	SAE Grade 2	25	90502A415	00000
			7/8"-9	1 7/16"	31/64"	SAE Grade 2	10	90502A420	00000
			1"-8	1 5/8"	35/64"	SAE Grade 2	10	90502A425	00000
			1 1/8"-7	1 13/16"	39/64"	SAE Grade 2	5	90502A430	00000
			1 1/4"-7	2"	23/32"	SAE Grade 2	5	90502A435	00000
			1 1/2"-6	2 3/8"	27/32"	SAE Grade 2	1	90502A440	0000


			1 3/4"-5	2 3/4"	31/32"	SAE Grade 2	1	90502A044	0000
			2"-4 1/2	3 1/8"	1 3/32"	SAE Grade 2	1	90502A046	00000
			2 1/2"-4	3 7/8"	1 29/64"	SAE Grade 2	1	90502A049	00000

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.

	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	1/2"	11/64"	25	91851A620	00000


	5/16"-18	9/16"	13/64"	20	91851A030	0000
	3/8"-16	11/16"	15/64"	10	91851A630	0000
	1/2"-13	7/8"	19/64"	10	91851A640	00000
	5/8"-11	1 1/16"	23/64"	5	91851A645	00000
	3/4"-10	1 1/4"	27/64"	1	91851A650	0000
	7/8"-9	1 7/16"	31/64"	1	91851A037	0000
	1"-8	1 5/8"	35/64"	1	91851A038	0000
	1 1/8"-7	1 13/16"	39/64"	1	91851A655	0000
	1 1/4"-7	2"	23/32"	1	91851A660	0000
	1 1/2"-6	2 3/8"	27/32"	1	91851A665	00000


	1 3/4"-5	2 3/4"	31/32"	1	91851A670	00000

Brass

Brass—Conductive and nonmagnetic, brass nuts are commonly used to secure electrical equipment, such as circuit board assemblies and mounting brackets, inside enclosures. They're also softer than most metals, so they won't damage other fastening components.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Brass



	1/4"-20	1/2"	11/64"	25	92683A029	00000


	5/16"-18	9/16"	13/64"	25	92683A840	00000
	3/8"-16	11/16"	15/64"	25	92683A845	00000
	7/16"-14	3/4"	17/64"	10	92683A847	0000
	1/2"-13	7/8"	19/64"	10	92683A855	00000
	5/8"-11	1 1/16"	23/64"	5	92683A860	00000
	3/4"-10	1 1/4"	27/64"	1	92683A865	0000
	7/8"-9	1 7/16"	31/64"	1	92683A869	0000
	1"-8	1 5/8"	35/64"	1	92683A872	0000
	1 1/8"-7	1 13/16"	39/64"	1	92683A879	0000
	1 1/4"-7	2"	23/32"	1	92683A882	00000


	1 1/2"-6	2 3/8"	27/32"	1	92683A885	00000

Thin-Heavy-Profile Flex-Top Locknuts for Heavy Vibration

About two-thirds the height of standard flex-top nuts and 10% wider, these fit in spaces with low clearance and handle heavier loads by distributing them over a larger area. Because of the thin profile, you can also use them as jam nuts by threading them against a hex nut to hold it in place. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Cadmium-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-20	1/2"	7/32"	25	94828A410	000000


	5/16"-18	9/16"	17/64"	10	94828A420	00000
	3/8"-16	5/8"	9/32"	10	94828A425	00000
	7/16"-14	3/4"	21/64"	1	94828A430	0000
	1/2"-13	13/16"	21/64"	5	94828A435	00000
	5/8"-11	1"	13/32"	1	94828A440	0000
	3/4"-10	1 1/8"	27/64"	1	94828A036	00000
	7/8"-9	1 5/16"	31/64"	1	94828A037	00000
	1"-8	1 1/2"	37/64"	1	94828A038	00000