M12 Jam Nuts | McMaster-Carr

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47 Products

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.

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.

Blue Dyed Steel—These metric-sized nuts have a distinctive blue color, so you can easily tell them apart from inch nuts.

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



	M12 × 1 mm	19	6	Class 04	DIN 439B, ISO 4035	Material Certificate	25	90326A232	000000


	M12 × 1.25 mm	19	6	Class 04	DIN 439B, ISO 4035	—	50	90326A120	00000
	M12 × 1.5 mm	19	6	Class 04	DIN 439B, ISO 4035	—	25	90326A125	00000
	M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	Material Certificate	50	90695A115	00000


	Zinc-Yellow-Chromate-Plated Steel



			M12 × 1.5 mm	19	6	Class 04	DIN 439B, ISO 4035	—	25	93737A113	0000


			M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	—	50	95027A116	00000


			Steel



					M12 × 1.25 mm	19	7	—	DIN 936	—	25	90364A105	0000


					M12 × 1.5 mm	19	6	Class 04	DIN 439B, ISO 4035	—	25	90326A211	0000
					M12 × 1.5 mm	19	7	—	DIN 936	—	25	90364A104	0000
					M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	—	50	94168A116	00000
					M12 × 1.75 mm	19	7	—	DIN 936	—	25	90370A103	0000


					Blue Dyed Steel



							M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	—	25	96276A410	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.

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



	M12 × 1 mm	19	6	DIN 439B, ISO 4035	Material Certificate	10	91938A160	000000


	M12 × 1.25 mm	19	6	DIN 439B, ISO 4035	—	10	91938A120	0000
	M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	—	10	91938A125	0000
	M12 × 1.5 mm	19	7	DIN 936	—	5	97013A114	00000
	M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	—	20	90710A130	00000
	M12 × 1.75 mm	19	7	DIN 936	—	10	90381A102	0000


	Black-Oxide 18-8 Stainless Steel



			M12 × 1.25 mm	19	6	DIN 439B, ISO 4035	—	5	97013A127	0000


			M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	—	5	97013A128	0000
			M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	—	5	96315A119	00000


			Highly Corrosion-Resistant 316 Stainless Steel



					M12 × 1.25 mm	19	6	DIN 439B, ISO 4035	—	1	97289A126	0000


					M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	—	1	97289A127	0000
					M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	—	10	93935A350	0000
					M12 × 1.75 mm	19	7	DIN 936	—	5	97289A113	0000

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.

Nickel-Plated Brass—The nickel plating offers better corrosion resistance than plain brass to stand up to solvents, salt water, and chemicals. The plating can wear off over time, so these nuts are not recommended for applications that experience a lot of friction or wear.

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Brass



	M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	10	93187A400	000000


	M12 × 1.75 mm	19	7	DIN 936	5	97057A120	00000


	Nickel-Plated Brass



			M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	1	93187A124	0000

Steel Hex Panel Nuts

Fasten these panel nuts with a wrench for more torque while tightening than knurled panel nuts. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels.

Metric Thread About Metric Thread

Zinc-Plated Steel—Zinc-plated steel nuts resist corrosion in wet environments.

	Wd., mm	Ht., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M12 × 1.5 mm	17	6	1	91862A711	00000

Shock Absorber Mounting Nuts

Hex Nuts

Use Mounting Blocks for Shock Absorbers (not included) to mount and secure threaded-body shock absorbers.

		Steel
	Thread Size		Each
Hex Nuts



		M12 × 1 mm	6600K76	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., mm	Ht., mm	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M12 × 1.75 mm	18	10.3	245	ISO 10511	5	90453A117	00000

Left-Hand-Thread Thin-Profile Hex Nuts

These nuts tighten when turned to the left. Use them with left-hand rods and screws to prevent counterclockwise-moving parts from loosening. 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.

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.

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



	M12 × 1.75 mm	19	6	Class 04	ASTM A108, DIN 439B, ISO 4035	1	90519A817	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.

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



	M12 × 1.25 mm	19	6	DIN 439, ISO 4035	—	1	94450A118	00000


	M12 × 1.75 mm	19	6	DIN 439, ISO 4035	Material Certificate	1	94450A117	0000
	M12 × 1.75 mm	19	6	DIN 439B	—	1	94450A553	0000


	Highly Corrosion-Resistant 316 Stainless Steel



			M12 × 1.25 mm	19	6	DIN 439B	—	1	93031A212	0000


			M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	—	1	93031A135	0000
			M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	—	1	93031A117	0000

Low-Profile Knurled-Head Thumb Nuts

Twist these thumb nuts into spaces without a lot of clearance. They have a short, slip-resistant head, so you can grip them easily and make controlled adjustments in cramped spots. You can also use them as jam nuts by threading them against another nut to hold it in place.

Steel

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

		Collar, mm
	Thread Size	Dia.	Ht.	Head Dia., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel



		M12 × 1.75 mm	20	2	36	10	DIN 467	1	92815A206	00000

Flanged Knurled-Head Thumb Nuts

The slip-resistant head is easy to grip, while the flange distributes pressure evenly across the mounting surface without the need for a separate washer. These nuts are often used to secure screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts.

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.

		Collar, mm
	Thread Size	Dia.	Ht.	Head Dia., mm	Ht., mm	Threading		Each
18-8 Stainless Steel



		M12 × 1.75 mm	24	20	31.8	30	Fully Threaded	96445A122	000000

Metric Lead Screws and Nuts

Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, size, and number of thread starts. Class 7e and 7H components are compatible.

Hex Nuts—Right-Hand Thread

Hex nuts fasten and position lead screw components.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

	Thread Type	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength		Each
Carbon Steel



	M12 × 3 mm	Metric Trapezoidal	12	22.2	1	1:1	3	Metric Trapezoidal Class 7H	SAE Grade 2	Not Rated	Not Rated	94353A120	000000

Square Nuts—Right-Hand Thread

Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.

360 Brass—360 brass components have excellent machinability and good corrosion resistance.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

	Thread Type	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness	Tensile Strength		Each
360 Brass



	M12 × 3 mm	Metric Trapezoidal	25	25	1	1:1	3	Metric Trapezoidal Class 7H	Not Rated	Not Rated	94353A312	000000

Bearing Nuts

Carbon Steel

Stepped Face

Often paired with spring lock washers to strengthen their hold, these bearing nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket.

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

Stepped Face—Use stepped-face bearing nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.

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.

	Nuts								Bearing Lock Washers
	Thread
	Size	Spacing	OD, mm	Wd., mm	Specs. Met	For Lock Washer Specs. Met		Each		Each
Carbon Steel







				Stepped Face

				M12 × 1.5 mm	Fine	28	6	DIN 1804	DIN 462	3564N12	00000	90407A113	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

				M12 × 1.5 mm	Fine	28	6	DIN 1816	3549N12	000000

Knurled-Head Thumb Nuts

Get a good grip on these nuts, even with oily fingers. They have a raised, slip-resistant head, so you can tighten them by hand and make controlled adjustments. Knurled-head nuts have a smaller profile than wing nuts, so they fit in tighter spots.

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.

		Collar, mm
	Thread Size	Dia.	Ht.	Head Dia., mm	Ht., mm	Threading		Each
18-8 Stainless Steel



		M12 × 1.75 mm	19	12	25.4	22	Fully Threaded	90368A103	00000


		Black-Oxide 18-8 Stainless Steel



				M12 × 1.75 mm	19	12	25.4	22	Fully Threaded	90368A116	00000