M16 Standoffs | McMaster-Carr

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Coupling Nut Profile

56 Products

Coupling Nuts

Also known as extension nuts, these are commonly used to connect lengths of threaded rod and join threaded parts.

Low-Strength Steel

Rated Grade 2 or lower, these are about half as strong as medium-strength steel coupling nuts. Use them with threaded rods that have a comparable 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-Oxide Steel—A dark, matte coating creates a finished look. Nuts offer minimal corrosion resistance, so they're best for dry environments.

							Each
	Thread Size	Lg., mm	Wd., mm	Threading	Specs. Met		1-9	10-49	50-Up
Zinc-Plated Steel



		M16 × 2 mm	48	24	Fully Threaded	DIN 6334	93355A380	00000	00000	00000


		Black-Oxide Steel



				M16 × 2 mm	40	27	Fully Threaded	—	93020A786	0000	0000	0000

Medium-Strength Steel

These Grade 5 or Class 8 nuts are about twice as strong as low-strength steel coupling nuts. Use them with threaded rods that have a comparable 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-Oxide Steel—A dark, matte coating creates a finished look. Nuts offer minimal corrosion resistance, so they're best for dry environments.

								Each
	Thread Size	Lg., mm	Wd., mm	Fastener Strength Grade/Class	Threading	Specs. Met		1-9	10-49	50-Up
Zinc-Plated Steel



		M16 × 2 mm	48	24	Class 8	Fully Threaded	DIN 6334	90009A225	00000	00000	00000


		Black-Oxide Steel



				M16 × 2 mm	48	24	Class 8	Fully Threaded	ASME B18.2.2, DIN 6334	90082A118	00000	00000	00000

High-Strength Steel

Rated Grade 8 or Class 10, these are about 25% stronger than medium-strength steel coupling nuts. Use them with threaded rods that have a comparable 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.

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

								Each
	Thread Size	Lg., mm	Wd., mm	Fastener Strength Grade/Class	Threading	Specs. Met		1-9	10-49	50-Up
Zinc-Plated Steel



		M16 × 2 mm	48	24	Class 10	Fully Threaded	DIN 6334	90331A556	000000	000000	000000


		Steel



				M16 × 2 mm	48	24	Class 10	Fully Threaded	DIN 6334	97778A140	0000	0000	0000

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.

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

								Each
	Thread Size	Lg., mm	Wd., mm	Threading	Min. Thread Lg., mm	Specs. Met		1-9	10-49	50-Up
18-8 Stainless Steel



		M16 × 2 mm	48	24	Fully Threaded	—	DIN 6334	93590A112	000000	000000	00000


		M16 × 2 mm	96	24	Partially Threaded	16	—	90268A462	000000	000000	00000


		Highly Corrosion-Resistant 316 Stainless Steel



				M16 × 2 mm	48	24	Fully Threaded	—	DIN 6334	90111A336	00000	00000	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.

						Each
	Thread Size	Lg., mm	Wd., mm	Threading		1-9	10-49	50-Up
Brass



		M16 × 2 mm	48	24	Fully Threaded	90465A421	000000	000000	000000

Round Coupling Nuts

Less bulky than hex coupling nuts, these have a smooth, round body that fits in tight spots. Their finished appearance makes them a common choice for decorative applications. Tighten by hand, or use soft-jaw pliers to avoid marring the outside surface. Also known as extension nuts, they are commonly used to connect lengths of threaded rod and join threaded parts.

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.

							Each
	Thread Size	Lg., mm	OD, mm	Threading	Specs. Met		1-9	10-Up
18-8 Stainless Steel



		M16 × 2 mm	30	22	Fully Threaded	ASTM A582	90202A118	000000	000000


		M16 × 2 mm	40	22	Fully Threaded	—	90202A445	0000	0000
		M16 × 2 mm	50	22	Fully Threaded	ASTM A582	90202A119	00000	00000

Metric-to-Metric Female Hex Thread Adapters

Increase or decrease metric thread size from one male-threaded part to another. Commonly used to connect two differently sized threaded rods, these adapters have a hex-shaped body, so you can tighten them with a standard wrench. You can also use them to change thread pitch or convert a male-threaded connection to a female-threaded connection. Small adapters can work as threaded standoffs, positioning and separating circuit boards and other components in assemblies.

Aluminum—Aluminum adapters are about one third of the weight of steel adapters. They resist corrosion in wet environments.

18-8 Stainless Steel—18-8 stainless steel adapters resist corrosion in wet environments. However, they will corrode when exposed to salt water and other chloride solutions.

316 Stainless Steel—316 stainless steel adapters withstand wet environments and resist corrosion caused by salt water and harsh chemicals.

ASTM A276, ASTM A582, and ASTM B211—Adapters that meet ASTM specifications are made from or plated with materials that adhere to specific standards for chemical and physical properties, such as hardness.

			Thread Lg., mm		Thread Fit		Hex, mm								Each
	Thread Size (A)	Thread Size (B)	(A)	(B)	(A)	(B)	Size	Length	Specs. Met	Tensile Strength, psi	Hardness	Certificate Form	Certificate Type		1-9	10-Up
Aluminum



		M12 x 1.75 mm	M16 x 2 mm	12	16	Metric Class 6H	Metric Class 6H	21	54	ASTM B211	45,000	Rockwell B56	—	—	92910A125	000000	000000


		18-8 Stainless Steel



				M12 x 1.75 mm	M16 x 2 mm	12	16	Metric Class 6H	Metric Class 6H	21	54	ASTM A582	85,000	Rockwell B80	—	—	98434A145	00000	00000


				316 Stainless Steel



						M12 x 1.75 mm	M16 x 2 mm	12	16	Metric Class 6H	Metric Class 6H	21	54	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	92909A134	00000	00000

High-Profile Hex Nuts

Slightly taller than standard-profile hex nuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach.

Medium-Strength Steel

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. 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.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M16 × 2 mm	24	16	Class 8	10	90725A735	000000

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench. Small adapters can also be used as standoffs, positioning and separating circuit boards and other components in assemblies.

Aluminum—At about a third of the weight of steel adapters, aluminum adapters are the lightest we offer. They resist corrosion in wet environments.

18-8 Stainless Steel—18-8 stainless steel adapters resist corrosion caused by water. They're good for wet and damp environments but will corrode when exposed to salt water and other chloride solutions.

316 Stainless Steel—316 stainless steel adapters have the best corrosion resistance. They stand up to wet environments, just like 18-8 stainless steel adapters, but unlike 18-8 stainless steel adapters, they resist corrosion caused by salt water and harsh chemicals.

			Thread Lg.		Thread Fit		Hex, mm								Each
	Thread Size (A)	Thread Size (B)	(A)	(B), mm	(A)	(B)	Size	Length	Specs. Met	Tensile Strength, psi	Hardness	Certificate Form	Certificate Type		1-9	10-Up
Aluminum



		1/2"-13	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM B211	45,000	Rockwell B56	Digital	Material Certificate with Traceable Lot Number	91079A175	000000	000000


		1/2"-20	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM B211	45,000	Rockwell B56	Digital	Material Certificate with Traceable Lot Number	91079A185	00000	00000
		1/2"-28	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM B211	45,000	Rockwell B56	—	—	91079A193	00000	00000


		18-8 Stainless Steel



				1/2"-13	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A582	85,000	Rockwell B80	—	—	98434A138	00000	00000


				1/2"-20	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A582	85,000	Rockwell B80	—	—	98434A842	00000	00000
				1/2"-28	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A582	85,000	Rockwell B80	Digital	Material Certificate with Traceable Lot Number	98434A853	00000	00000


				316 Stainless Steel



						1/2"-13	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A276	75,000	Rockwell B83	—	—	91076A205	00000	00000


						1/2"-20	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	91076A216	00000	00000
						1/2"-28	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	91076A226	00000	00000

Square Weld Nuts

With four symmetrical projections, these nuts create the strongest hold in our offering. Unlike rectangular weld nuts, each projection is equidistant from the threads, so welds wrap evenly for extra strength and twist resistance. Projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. All nuts have a collar pilot that guides them into the hole, holds them in place while welding, and protects the threads from weld spatter.

Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.

	Wd., mm	Ht., mm	For Hole Dia., mm	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M16 × 2 mm	24	13	18.8	DIN 928	5	93975A122	000000

Load-Rated Reinforced Threaded-Stud Bumpers

Style 1

Tested to support the load of your application. These bumpers support a wide range of equipment—from a 50 lb. saw to a 5,000 lb. air compressor. They also help reduce vibration and protect whatever they’re mounted to. All have a metal base plate for added strength and a longer service life than all-rubber bumpers. No separate fasteners are needed—just twist them into a threaded hole.

Natural Rubber with Steel Stud and Base Plate

Style 1

These bumpers absorb impact well enough for most applications. However, they're not for use outdoors and break down when exposed to oil and harsh chemicals.

Hardness Rating—The harder the bumper, the better it withstands impact and abrasion over time. The softer the bumper, the more cushioning it provides for objects made of glass, soft metal, and other fragile materials. Bumpers with a medium rating offer a balance of impact resistance and cushioning.

	Thread
	Size	Lg., mm	OD, mm	Ht., mm	Max. Load, lb.	Deflection @ Cap.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Style 1



		M16 × 2 mm	41	100	40	2,720	0.39"	Durometer 50A	Medium	Black	-10 to 150	No	No	93115K991	000000


		M16 × 2 mm	41	100	60	2,910	0.59"	Durometer 50A	Medium	Black	-10 to 150	No	No	93115K993	00000
		M16 × 2 mm	41	125	75	5,340	0.7"	Durometer 70A	Hard	Black	-40 to 170	No	No	3810N177	00000

Reinforced Threaded-Stud Bumpers with Steel Core

Style 1

Our most durable and impact-resistant bumpers. With a steel core, they withstand repeated impacts for a longer service life than all-rubber bumpers. You can also use them as spacers and noise reducers. No separate fasteners are needed—just twist them into a threaded hole.

Multipurpose Neoprene About Multipurpose Neoprene

Style 1

A good choice for oily equipment that's exposed to sunlight, rain, and ozone. These aren't as oil resistant as Buna-N bumpers, but they can be used outdoors.

	Thread
	Size	Lg., mm	OD, mm	Ht., mm	Overall Ht., mm	Hardness	Hardness Rating	Color	Temp., ° F	Stud Material	Nonmarking	For Use Outdoors		Each
Style 1



		M16 × 2 mm	15	32	32	47	Durometer 40A	Medium Soft	Black	-40 to 200	Steel	Yes	Yes	9546K247	000000


		M16 × 2 mm	15	32	32	47	Durometer 75A	Hard	Black	-40 to 200	Steel	Yes	Yes	9546K537	00000
		M16 × 2 mm	30	32	32	62	Durometer 40A	Medium Soft	Black	-40 to 200	Steel	Yes	Yes	9546K253	00000
		M16 × 2 mm	30	32	32	62	Durometer 75A	Hard	Black	-40 to 200	Steel	Yes	Yes	9546K538	00000
		M16 × 2 mm	30	45	42	72	Durometer 40A	Medium Soft	Black	-40 to 200	Steel	Yes	Yes	9546K255	00000
		M16 × 2 mm	30	45	42	72	Durometer 75A	Hard	Black	-40 to 200	Steel	Yes	Yes	9546K539	00000

Abrasion-Resistant Polyurethane Rubber About Abrasion-Resistant Polyurethane Rubber

Style 1

Our toughest rubber bumpers, they keep their shape even when knocked and scraped by metal and other abrasive materials. They're often used on industrial vehicles, conveyors, and heavy construction equipment.

	Thread
	Size	Lg., mm	OD, mm	Ht., mm	Overall Ht., mm	Hardness	Hardness Rating	Color	Temp., ° F	Stud Material	Nonmarking	For Use Outdoors		Each
Style 1



		M16 × 2 mm	15	32	32	47	Durometer 80A	Hard	Red	-60 to 200	Steel	Yes	Yes	9546K248	000000


		M16 × 2 mm	30	32	32	62	Durometer 80A	Hard	Red	-60 to 200	Steel	Yes	Yes	9546K264	00000
		M16 × 2 mm	30	45	42	72	Durometer 80A	Hard	Red	-60 to 200	Steel	Yes	Yes	9546K266	00000

Quick-Grip Flanged Hydraulic Bushings

Tighten just one set screw to clamp these bushings evenly around your shaft. The screw forces hydraulic fluid in between the double-walled sleeve, expanding the two walls against the shaft and the hub of your sprocket, pulley, or gear for a tight hold. Since you don’t have to tighten multiple screw clamps individually, these bushings are quick to adjust and more likely to stay aligned on your shaft. They’re also good for shock loads. A mounting flange prevents movement during tightening. Use a hex key to tighten.

Note: To avoid deforming the sleeve walls, make sure to fully tighten the screw.

17-4 PH Stainless Steel—17-4 PH stainless steel bushings have excellent corrosion resistance in most environments.

				Set Screw
	For Shaft Dia.	OD	Overall Wd.	Hole Dia.	Thread Size	Max. Torque, in·lbf	Fastener Tightening Torque, in·lbf		Each
Steel



		1 1/2"	3 5/16"	2 13/16"	5/8"	M16	7,850	180	7636N17	0000000


		40 mm	86 mm	75 mm	5/8"	M16	9,700	180	7636N21	000000
		50 mm	98 mm	80 mm	5/8"	M16	16,800	180	7636N22	000000


		17-4 PH Stainless Steel



				1 1/2"	3 5/16"	2 13/16"	5/8"	M16	7,850	180	7636N27	00000000


				40 mm	86 mm	75 mm	5/8"	M16	9,700	180	7636N31	00000000
				50 mm	98 mm	80 mm	5/8"	M16	16,800	180	7636N32	00000000

Load-Rated Reinforced Threaded-Hole Bumpers

Style 1

Tested to ensure they’ll bear the weight of your application, these bumpers support everything from a 50-pound saw to a 2,000-pound air compressor. They also help reduce vibration and protect whatever they're mounted to. All have a metal base plate for added strength and a longer life than all-rubber bumpers. Twist them onto a threaded stud on your equipment, or pair them with your own stud to create a custom-length bumper.

Natural Rubber with Steel Base Plate

Style 1

These bumpers absorb impact well enough for most applications. However, they're not for use outdoors and break down when exposed to oil and harsh chemicals.

	Thread
	Size	Dp., mm	OD, mm	Ht., mm	Max. Load, lb.	Deflection @ Cap.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Style 1



		M16 × 2 mm	16	100	40	2,110	0.39"	Durometer 40A	Medium Soft	Black	-40 to 170	Yes	No	9377K398	000000


		M16 × 2 mm	16	100	40	2,720	0.39"	Durometer 55A	Medium	Black	-20 to 150	Yes	No	93115K791	00000

Reinforced Threaded-Hole Bumpers

Style 1

With a metal base plate for added strength, these bumpers withstand repeated impacts for a longer service life than all-rubber bumpers. You can also use them as spacers and noise reducers. Twist them onto a threaded stud on your equipment, or pair them with your own stud to create a custom-length bumper.

Multipurpose Neoprene About Multipurpose Neoprene

Style 1

A good choice for oily equipment that's exposed to sunlight, rain, and ozone. These aren't as oil resistant as Buna-N bumpers, but they can be used outdoors.

	Thread
	Size	Dp., mm	OD, mm	Ht., mm	Hardness	Hardness Rating	Color	Temp., ° F	Base Plate Material	Nonmarking	For Use Outdoors		Each
Style 1



		M16 × 2 mm	13	32	32	Durometer 40A	Medium Soft	Black	-40 to 200	Steel	No	Yes	9546K227	000000


		M16 × 2 mm	13	32	32	Durometer 70A	Hard	Black	-40 to 200	Steel	No	Yes	9546K476	00000
		M16 × 2 mm	16	45	42	Durometer 70A	Hard	Black	-40 to 200	Steel	No	Yes	9546K477	00000

Abrasion-Resistant Polyurethane Rubber About Abrasion-Resistant Polyurethane Rubber

Style 1

	Thread
	Size	Dp., mm	OD, mm	Ht., mm	Hardness	Hardness Rating	Color	Temp., ° F	Base Plate Material	Nonmarking	For Use Outdoors		Each
Style 1



		M16 × 2 mm	13	32	32	Durometer 80A	Hard	Red	-40 to 200	Steel	No	Yes	9223K172	000000


		M16 × 2 mm	16	45	42	Durometer 40A	Medium Soft	Black	-40 to 200	Steel	No	Yes	9546K484	00000
		M16 × 2 mm	16	45	42	Durometer 95A	Extra Hard	Black	-40 to 200	Steel	No	Yes	9546K493	00000

Weld Locknuts

Prevent screws from backing out under heavy vibration. These nuts have distorted threads that grip screws tightly. Three evenly spaced projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. These nuts also have a collar pilot that guides the nut into the hole, holds it in place while welding, and protects the threads from weld spatter.

Use Grade 2 or Class 6 screws to avoid stripping threads during installation. Distorted threads require high torque for fastening and unfastening, so you may need an impact wrench to remove screws.

Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.

				Collar, mm
	Thread Size	Wd., mm	Ht., mm	Dia.	Ht.	For Hole Dia., mm	Pkg. Qty.		Pkg.
Steel



		M16 × 2 mm	26	13	20.6	1.3	20.6	5	90744A130	00000

Weld Nuts

Add permanent threads to thin metal with our go-to weld nuts. Unlike press-fit and rivet nuts, these nuts fuse to the base metal, so they won’t twist and pull out. Three evenly spaced projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. All have a collar pilot that guides the nut into the hole, holds it in place while welding, and protects the threads from weld spatter. You can also install them on thick pieces of metal.

Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.

18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.

				Collar, mm
	Thread Size	Wd., mm	Ht., mm	Dia.	Ht.	For Hole Dia., mm	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
Steel



		M16 × 2 mm	24	11.2	18.8	1.8	18.8	DIN 929	Material Certificate	10	93337A900	000000


		18-8 Stainless Steel



				M16 × 2 mm	24	11.2	18.8	1.8	18.8	DIN 929	—	1	93418A900	00000