1 1/2"-6 Couplings | McMaster-Carr

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11 Products

Tow Eyes

Style 4

These eyes mount to a trailer and connect to the drawbar coupler or tow hook on a vehicle to create a towing connection.

Note: Capacity is reduced 25% in off-road use.

Threaded-Stud Mount

Style 4

Corrosion-Resistant-Coated Steel—Corrosion-resistant-coated steel eyes offer the most corrosion resistance.

For Maximum Trailer Weight—Maximum trailer weight is the total weight being towed.

Vertical Capacity—Vertical capacity (also known as tongue weight) represents the weight of the load on the tow eye.

				Overall				Eye			Thread
	Style	For Max. Trailer Wt., lb.	Vert. Cap., lb.	Dp.	Ht.	Material	Color	ID	Thk.	Stud Lg.	Size	Lg.	Specs. Met		Each
Fixed Height



		4	15,000	3,000	9 1/8"	2 1/2"	Corrosion-Resistant-Coated Steel	Black	2 1/2"	1 1/2"	3 1/4"	1 1/2"-6	1 3/4"	ASTM B117	12675T23	0000000

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.	Wd.	Threading	Min. Thread Lg.		1-9	10-49	50-Up
Zinc-Plated Steel



		1 1/2"-6	3 1/2"	2"	Fully Threaded	—	90264A290	000000	000000	000000


		1 1/2"-6	8"	2 3/8"	Partially Threaded	3 7/8"	90264A703	00000	00000	00000


		Black-Oxide Steel



				1 1/2"-6	4"	2"	Fully Threaded	—	91034A423	00000	00000	00000

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.

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



		1 1/2"-6	3 1/2"	2"	SAE Grade 5	Fully Threaded	90977A245	000000	000000	000000

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.

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



		1 1/2"-6	3 1/2"	2 1/4"	SAE Grade 8	Fully Threaded	90983A251	000000	000000	000000

Extreme-Strength Steel

Made from Grade 2H steel, these are about 20% stronger than high-strength steel coupling nuts. Use them with threaded rods that have a comparable strength rating to avoid stripping threads during installation.

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

							Each
	Thread Size	Lg.	Wd.	Fastener Strength Grade/Class	Threading		1-9	10-49	50-Up
Steel



		1 1/2"-6	3 1/2"	2 1/2"	ASTM Grade 2H	Fully Threaded	90654A351	000000	000000	000000

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.	Wd.	Threading		1-9	10-49	50-Up
18-8 Stainless Steel



		1 1/2"-6	3 1/2"	2"	Fully Threaded	90268A513	000000	000000	000000

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.	Wd.	Threading		1-9	10-49	50-Up
Brass



		1 1/2"-6	3 1/2"	2"	Fully Threaded	90465A333	0000000	0000000	000000

Left-Hand to Right-Hand Female Hex Thread Adapters

Often called sleeve nuts, these thread adapters fasten parts with right-hand threads to parts with left-hand threads.

Zinc-Plated Steel—Zinc-plated steel adapters are strong and corrosion resistant.

			Thread Lg.		Thread Fit		Hex				Each
	Thread Size (A)	Thread Size (B)	(A)	(B)	(A)	(B)	Size	Length	Hardness		1-9	10-Up
Zinc-Plated Steel



		1 1/2"-6	1 1/2"-6	3 3/4"	3 3/4"	Unified Standard Class 2B	Unified Standard Class 2B	2 3/8"	8"	Rockwell B65	94280A104	000000	000000

High-Strength Fully Threaded Rod End Bolts

These alloy steel rod end bolts have the highest tensile strength of any steel fully threaded rod end bolt we offer. For maximum mounting flexibility, cut the fully threaded shaft to whatever length you need. Also known as swing bolts and eyebolts, rod end bolts have no moving parts. They're designed to make pivoting or hinge movements in applications that don't need to compensate for misalignment.

	Shank
	Thread Size	Ctr. Lg.	Thread Lg.	ID	Overall Wd.	Shank Threading	Overall Thk.	Tensile Strength, psi	Specs. Met	Fastener Strength Grade/Class		Each
Right-Hand Shank Thread







				Black-Oxide Alloy Steel

				1 1/2"-6	6"	4"	1 1/2"	3 3/32"	Fully Threaded	1 1/2"	125,000	ASTM A193	ASTM Grade B7	2440K47	0000000