1 3/8"-6 Fasteners | McMaster-Carr

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.

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

							Each
	Thread Size	Lg.	Wd.	Threading	Min. Thread Lg.		1-9	10-49	50-Up
Steel



		1 3/8"-6	8"	2 1/4"	Partially Threaded	3 7/8"	90264A704	000000	000000	000000

Heavy-Profile Hex Nuts

About 10% wider and taller than standard-profile hex nuts, these handle heavier loads by distributing them over a larger area.

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.

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

	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Steel



	1 3/8"-6	2 3/16"	1 11/32"	SAE Grade 5	1	95045A041	00000

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.

Hot-Dipped Galvanized Steel—Combines the strength of steel with the rust resistance of stainless steel. These nuts are an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals. The galvanized finish is thicker than other types of coatings, so the threads may be more likely to stick during installation. Use with other hot-dipped galvanized fasteners.

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

	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
Hot-Dipped Galvanized Steel



	1 3/8"-6	2 3/16"	1 11/32"	ASTM Grade 2H	ASTM A194	—	1	95025A437	00000


	Steel



			1 3/8"-6	2 3/16"	1 11/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	Material Certificate	1	90521A290	0000

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.

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

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
Steel



	1 3/8"-6	2 3/16"	1 11/32"	ASME B18.2.2	1	90498A042	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.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these nuts won't degrade when exposed to harsh weather, salt water, and most chemicals.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

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



	1 3/8"-6	2 3/16"	1 11/32"	Material Certificate	1	91849A042	000000


	Highly Corrosion-Resistant 316 Stainless Steel



			1 3/8"-6	2 3/16"	1 11/32"	Material Certificate	1	91850A042	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.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Wd.	Ht.	Certificate Type	Pkg. Qty.		Pkg.
Brass



	1 3/8"-6	2 3/16"	1 11/32"	Material Certificate	1	92680A055	000000

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications, from mounting I-beams to suspending light fixtures.

Medium-Strength Steel

Image of Product. Front orientation. Threaded Rods. Threaded Rods.

With tensile strengths from 110,000 psi to 125,000 psi, these rods are strong enough for most industrial applications, such as anchoring machinery and connecting pipe flanges. They are about twice as strong as low-strength steel rods. To avoid stripped threads during installation, make sure your nuts are also medium-strength steel.

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

	Hardness	Specs. Met		Each
Steel







	1 3/8"-6

	1	125,000	ASTM Grade B7	Rockwell C35	ASTM A193	98957A509	000000


	2	125,000	ASTM Grade B7	Rockwell C35	ASTM A193	98957A823	00000
	3	125,000	ASTM Grade B7	Rockwell C35	ASTM A193	98957A618	00000
	6	125,000	ASTM Grade B7	Rockwell C35	ASTM A193	98957A718	000000

High-Strength Steel

With a tensile strength of 150,000 psi, these rods are strong enough to stabilize steel frameworks and structural supports, such as I-beams. They are about 25% stronger than medium-strength steel rods. To avoid stripped threads during installation, make sure your nuts are also high-strength steel.

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

	Hardness	Specs. Met		Each
Steel







	1 3/8"-6

	1	150,000	ASTM Grade BD	Rockwell C33	ASTM A354 Grade BD	90322A397	000000


	2	150,000	ASTM Grade BD	Rockwell C33	ASTM A354 Grade BD	90322A374	000000
	3	150,000	ASTM Grade BD	Rockwell C33	ASTM A354 Grade BD	90322A239	000000
	6	150,000	ASTM Grade BD	Rockwell C33	ASTM A354 Grade BD	90322A240	000000

Low-Strength Steel

With a tensile strength of 50,000 psi or 60,000 psi, these rods are often used to suspend light fixtures, cable trays, and conduit from ceilings. They're about half the strength of medium-strength steel rods. To avoid stripped threads during installation, make sure your nuts are also low-strength steel.

Zinc-Plated Steel—The most common choice for areas with occasional exposure to moisture.

	Pkg. Qty.		Pkg.
Zinc-Plated Steel







	1 3/8"-6

	3	50,000	Rockwell B61	1	98841A042	000000


	6	50,000	Rockwell B61	1	98914A042	000000

Stainless Steel

More corrosion resistant than steel rods and comparable in strength to low-strength steel.

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

	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	1 3/8"-6

	1	70,000	Rockwell B70	1	98804A128	0000000


	3	70,000	Rockwell B70	1	98847A280	000000
	6	70,000	Rockwell B70	1	98920A316	000000

Stainless Steel Hex Head Screws


Fully Threaded	Partially Threaded

Won't rust or corrode when exposed to moisture and chemicals. These screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.

Length is measured from under the head.

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

		Head					Imported
	Lg.	Wd.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1 3/8"-6

				3 1/2"	2 1/16"	27/32"	Fully Threaded	Coarse	80,000	1	92800A356	000000


				4"	2 1/16"	27/32"	Partially Threaded	Coarse	80,000	1	92198A139	00000
				5"	2 1/16"	27/32"	Partially Threaded	Coarse	80,000	1	92198A141	00000
				6"	2 1/16"	27/32"	Partially Threaded	Coarse	80,000	1	92198A143	00000

Steel Socket Head Screws

Fully Threaded

Partially Threaded

Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.

Length is measured from under the head.

Black-Oxide Alloy Steel—Best for dry environments since moisture will cause these screws to rust. They have a dark, matte appearance.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				1 3/8"-6

				5"	2 1/16"	1 3/8"	Fully Threaded	Coarse	170,000	1	91251A771	000000


				6"	2 1/16"	1 3/8"	Partially Threaded	Coarse	170,000	1	91251A773	00000
				8"	2 1/16"	1 3/8"	Partially Threaded	Coarse	170,000	1	91251A775	000000
				10"	2 1/16"	1 3/8"	Partially Threaded	Coarse	170,000	1	91251A778	000000
				12"	2 1/16"	1 3/8"	Partially Threaded	Coarse	170,000	1	91251A780	000000

Hex Nuts

The most commonly used hex nuts, these are suitable for fastening most machinery and equipment.

Medium-Strength Steel

Image of Product. Front orientation. Hex Nuts. Hex Nuts.

Image of Specification. Front orientation. Hex Nuts. Hex Nuts.

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.

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	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 5	ASME B18.2.2	1	95462A562	00000


	Black-Oxide Steel



			1 3/8"-6	2 1/16"	1 3/16"	SAE Grade 5	ASME B18.2.2	1	95479A222	0000


			Steel



					1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 5	ASME B18.2.2	1	95505A624	0000

High-Strength Steel

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

Material Certificate—Nuts include a report with a traceable lot number and a description of their chemical and physical properties.

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.

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

Zinc-Flake-Coated Steel—The most durable zinc coating, zinc flake is a multilayer finish that resists wear for long-term rust protection. Similar to zinc yellow-chromate, it won't hold up to harsh chemicals like stainless steel can.

	Wd.	Ht.	Fastener Strength Grade/Class	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



	1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 8	—	1	94895A042	000000


	Black-Oxide Steel



			1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 8	Material Certificate	1	94895A628	00000


			Steel



					1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 8	—	1	90499A042	0000


					Zinc-Flake-Coated Steel



							1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 8	—	1	93827A292	0000

Low-Strength Steel

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 3/8"-6	2 1/16"	1 11/64"	SAE Grade 2	ASME B18.2.2	1	90473A042	00000


	Steel



			1 3/8"-6	2 1/16"	1 11/64"	SAE Grade 2	ASME B18.2.2	1	90490A442	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—Superior to 18-8 stainless steel, these nuts won't degrade when exposed to harsh weather, salt water, and most chemicals.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

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



	1 3/8"-6	2 1/16"	1 11/64"	Material Certificate	1	91845A042	00000


	Highly Corrosion-Resistant 316 Stainless Steel



			1 3/8"-6	2 1/16"	1 11/64"	Material Certificate	1	94804A169	0000

Nylon-Insert Locknuts

Versatile yet economical, these are the most commonly used locknuts. 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.

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.

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



	1 3/8"-6	2"	1 37/64"	185	1	91831A174	000000

Hoist Rings—For Lifting

180° Pivot

360° Swivel

Designed for angular lifting, hoist rings resist stresses that would bend or break an eyebolt. They have a lifting ring that pivots 180° front to back and a base that swivels 360° to compensate for pitch, roll, and sway when lifting heavy or unbalanced loads. Install the base of the hoist ring flush to the mounting surface and tighten to the recommended torque that is stamped on the ring. Torque wrenches are sold separately.

Note: Capacities listed are for vertical lifting only. As the lift angle changes from vertical, the amount of weight the hoist ring can lift is significantly reduced. For example, when lifting a 1,000 lb. load at a 45° angle, you must choose a hoist ring with a capacity of at least 1,400 lbs. Do not use at an angle less than 30°.

Warning: Never use to lift people or items over people.

Black-Oxide Steel—Black-oxide steel hoist rings have mild corrosion resistance.

CE Marked—Hoist rings that are CE marked meet European safety standards.

										Each
Thread Size	Thread Lg.	Inside Wd.	Overall Ht.	Vert. Cap., lb.	Movement	Specs. Met	Certification	Mil. Spec.		1-9	10-Up







			Forged Black-Oxide Steel

			1 3/8"-6	2 5/8"	4"	11 7/8"	20,000	180° Pivot and 360° Swivel	ASME B30.26	CE Marked, Mil. Spec.	MIL-STD-1365, MIL-STD-209	2994T82	0000000	0000000

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.

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

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



	1 3/8"-6	2 3/16"	25/32"	ASTM Grade 2H	ASME B18.2.2, ASTM A194	1	95010A320	00000

Thin-Profile Hex Nuts

About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Medium-Strength Steel

These Grade 5 or Class 04 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.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	1 3/8"-6	2 1/16"	25/32"	SAE Grade 5	ASME B18.2.2	1	94846A440	000000

High-Strength Steel

Material Certificate—Nuts include a report with a traceable lot number and a description of their chemical and physical properties.

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

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



	1 3/8"-6	2 1/16"	25/32"	SAE Grade 8	ASME B18.2.2	—	1	93839A660	000000


	Steel



			1 3/8"-6	2 1/16"	25/32"	SAE Grade 8	ASME B18.2.2	Material Certificate	1	92052A340	00000

Thin-Profile Nylon-Insert Locknuts

About half the height of standard-profile locknuts, these fit in spaces with low clearance. 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.

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.

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



	1 3/8"-6	2"	51/64"	220	1	90566A268	00000