M48 Fasteners | McMaster-Carr

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

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				M48 × 5 mm

				140	72	48	Partially Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A156	000000


				180	72	48	Partially Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A157	00000
				200	72	48	Partially Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A158	000000
				260	72	48	Partially Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A159	000000
				300	72	48	Partially Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A163	000000

Hex Nuts

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

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.

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



	M48 × 5 mm	75	38	Class 8	DIN 934	1	90591A824	000000


	Zinc-Yellow-Chromate-Plated Steel



			M48 × 5 mm	75	38	Class 8	DIN 934	1	97700A340	00000


			Black-Oxide Steel



					M48 × 5 mm	75	38	Class 8	DIN 934	1	90593A023	00000


					Steel



							M48 × 3 mm	75	38	Class 8	DIN 934	1	91423A390	00000


							M48 × 5 mm	75	38	Class 8	DIN 934	1	90592A872	00000

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.

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

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



	M48 × 5 mm	75	38	Class 10	DIN 934	1	90685A104	000000

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



	M48 × 5 mm	75	38	Class 12	DIN 934	1	94223A117	000000

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.

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

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel



	M48 × 5 mm	75	38	DIN 934	1	95479A522	000000


	Steel



			M48 × 5 mm	75	38	DIN 934	1	95505A722	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.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but 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.

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M48 × 5 mm	75	38	DIN 934	1	91828A480	000000


	Black-Oxide 18-8 Stainless Steel



			M48 × 5 mm	75	38	DIN 934	1	98676A370	00000


			Highly Corrosion-Resistant 316 Stainless Steel



					M48 × 5 mm	75	38	DIN 934	1	94150A397	00000

Thin-Profile Bearing Nuts

Used in pairs or with another bearing nut, these thin-profile nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle. Threading two nuts tightly against each other makes it harder for vibration to loosen your assembly than if you used only one nut. For the nut closer to the bearing, position the stepped face towards the bearing. These thin-profile nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. All meet DIN 1816, an international standard for bearing locknut dimensions.

Carbon Steel—Carbon steel bearing nuts are strong and resist wear.

Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.

	Thread
	Size	Spacing	OD, mm	Wd., mm	Specs. Met		Each
Carbon Steel







				Stepped Face

				M48 × 1.5 mm	Extra Fine	75	13	DIN 1816	3549N27	000000

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.

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

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



	M48 × 5 mm	75	24	Class 04	DIN 439B, ISO 4035	1	90695A157	000000


	Steel



			M48 × 1.5 mm	75	18	—	DIN 936	1	90364A127	00000


			M48 × 3 mm	75	18	—	DIN 936	1	90364A126	00000
			M48 × 3 mm	75	24	Class 04	DIN 439B, ISO 4035	1	90326A228	00000
			M48 × 5 mm	75	18	—	DIN 936	1	90370A117	00000
			M48 × 5 mm	75	24	Class 04	DIN 439B, ISO 4035	1	94168A127	00000

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.

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



	M48 × 3 mm	80	48	ASTM Grade 2H	ASTM A194	1	98498A212	000000


	M48 × 5 mm	80	48	ASTM Grade 2H	ASTM A194	1	98498A119	00000

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.

Medium-Strength Steel

Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.

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	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M48 × 3 mm	75	48	Class 8	220	DIN 985, ISO 10511	1	90576A726	000000


	M48 × 5 mm	75	48	Class 8	220	DIN 985, ISO 10511	1	90576A166	00000

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.

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

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

	Hardness	Specs. Met		Each
Zinc-Plated Steel







	M48 × 5 mm

	1 m	110,000	Class 8.8	Rockwell C20	DIN 976	99067A144	0000000


	Steel







					M48 × 5 mm

					300 mm	125,000	ASTM Grade B7	Rockwell C35	ASTM A193, DIN 976	93325A457	000000


					300 mm	110,000	Class 8.8	Rockwell C20	DIN 976	99055A346	000000
					1 m	125,000	ASTM Grade B7	Rockwell C35	ASTM A193, DIN 976	93325A458	000000
					1 m	110,000	Class 8.8	Rockwell C20	DIN 976	99055A347	000000
					2 m	125,000	ASTM Grade B7	Rockwell C35	ASTM A193, DIN 976	93325A459	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







	M48 × 5 mm

	1	150,000	Class 10.9	Rockwell C32	DIN 976	1078N26	0000000


	2	150,000	Class 10.9	Rockwell C32	DIN 976	1078N111	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.

	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	M48 × 5 mm

	1	70,000	Not Rated	DIN 976	1	90024A327	0000000

T-Slot Nuts

Slide into T-slot tracks on machine tool tables to secure clamps and workpieces. These nuts are often paired with setup studs for adjustable fixtures.

Metric

Black-Oxide Steel—Create a finished look with a dark, matte coating. These nuts offer minimal corrosion resistance, so they're best for dry environments.

Fully Threaded—Fully threaded nuts allow a stud to extend beyond the bottom of the nut.

DIN 508—Nuts meet DIN dimensional and material requirements. Slide them into DIN 650 T-slots.

			Base, mm					Fully Threaded
	For Slot Wd., mm	Thread Size	Lg.	Wd.	Ht.	Overall Ht., mm	Specs. Met		Each
Black-Oxide Steel



		54	M48 × 5 mm	85	85	34	70	DIN 508	90510A242	0000000

Eyebolts—For Lifting

Also known as machinery eyebolts.

Note: Capacities listed are for vertical lifting only. Eyebolts with shoulder can be used for angular lifting up to 45°, but the capacities will be significantly reduced. For angular lifting, we recommend Hoist Rings. Eyebolts without shoulder are for vertical lifting only.

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

Steel

Closed Eye

With Shoulder

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread						With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Threading	Overall Lg., mm		Each
Closed Eye



		M48 × 5 mm	96	96	82	36,075	Fully Threaded	296	3040T27	0000000

Zinc-Plated Steel

Closed Eye

With Shoulder

Zinc-plated steel eyebolts offer good corrosion resistance.

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Specs. Met	Threading	Overall Lg., mm		Each
Closed Eye



		M48 × 5 mm	68	68	90	18,950	DIN 580	Fully Threaded	236	3107T66	0000000

Locknuts for use with Cotter Pins

Use these locknuts to secure rotating parts subjected to mild vibration, such as the wheels on carts and hand trucks. They’re not recommended for use on parts exposed to high vibration because the pin can shear under prolonged stress. These nuts are reusable, but you'll need a new cotter pin (not included) with each use.

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., mm	Ht., mm	Fastener Strength Grade/Class	For Cotter Pin Dia., mm	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M48 × 5 mm	75	50	Class 8	8	DIN 935	1	93760A124	000000

Rotating Eyebolts—For Lifting

Unlike conventional eyebolts, you can rotate the eye 360° to match the angle of your load.

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

Powder-Coated Steel

Powder-coated steel eyebolts are impact resistant, but less corrosion resistant than stainless steel eyebolts. They include a removable key for tightening the bolt.

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Threading	Color	Overall Lg., mm		Each
Closed Eye



		M48 × 5 mm	72	72	96	26,450	Fully Threaded	Pink	252	3059T127	0000000

Bearing Locknuts

Carbon Steel

With a nylon insert that grips your threaded shaft or spindle without damaging its threads, these locknuts—also called shaft nuts—hold bearings, bushings, gears, and pulleys prone to vibration tightly in place. They come as one piece, so you can easily clamp them onto your shaft or spindle. But, since they aren’t made entirely of metal, they don’t stand up to heat as well as all-metal locknuts. Slots in their sides mean you can tighten and loosen them with a spanner wrench or spanner socket. Their face is also chamfered to help keep the size and weight of your assembly at a minimum. All meet international standards for bearing locknut dimensions.

Zinc-Plated Carbon Steel—Zinc-plated carbon steel locknuts resist rusting from some moisture, but you shouldn’t use them with salt water or chemicals. They are strong and resist wear, though they don’t stand up to corrosion as well as 303 stainless steel locknuts.

Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.

	Thread					Zinc-Plated Carbon Steel
	Size	Spacing	OD, mm	Wd., mm	Insert Max. Temp., ° F		Each
Chamfered Face



		M48 × 1.5 mm	Extra Fine	64	13.5	210	3552N44	0000000

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.

Machined—Machined hoist rings have a smooth finish to protect slings and hooks from damage and excess wear during lifting.

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







			Machined Black-Oxide Steel

			M48 × 5 mm	79	114	396	29,750	180° Pivot and 360° Swivel	ASME B30.26	CE Marked, Mil. Spec.	MIL-STD-1365, MIL-STD-209	29495T24	0000000	0000000

Swivel-Under-Load Hoist Rings—For Lifting


	180° Pivot	360° Swivel

The ball bearing on these hoist rings makes it easy to rotate your load even after it’s suspended. For unbalanced or heavy loads, the base also swivels to compensate for pitch, roll, and sway. Their lifting ring pivots 180° front to back. Ideal for angular lifting, these hoist rings withstand stresses that bend or break eyebolts.

Install the base of these hoist rings flush to your mounting surface. Use a torque wrench to tighten to the recommended torque stamped on the ring.

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

Overall Ht., mm	Vert. Cap., lb.	Movement	Specs. Met	Certification		Each







Forged Yellow Powder-Coated Steel

M48 × 5 mm	72	70	342	31,740	180° Pivot and 360° Swivel	ASME B30.26	CE Marked	4137N21	000000000