Metric Finger Nuts | McMaster-Carr

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Super Corrosion Resistant

Specifications Met

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Compliant with Exemptions

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Export Control Classification Number (ECCN)

EAR99

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Color

144 Products

Thumb Nut Grip Type

Knurled Head

Get a good grip, even with oily fingers

77 products

Wing

Give you more leverage than knurled-head nuts for a tighter fit

57 products

Environment

Sanitary

Free of crevices where bacteria can grow

10 products

Performance

Corrosion Resistant

Won't rust in wet and outdoor environments

95 products

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.

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.

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


		M2 × 0.4 mm	5	4	10	6	Fully Threaded	—	000000000	00000
		M2.5 × 0.45 mm	6	5	12	7.5	Fully Threaded	—	000000000	0000
		M3 × 0.5 mm	6	5	12	7.5	Fully Threaded	DIN 466	000000000	0000
		M3.5 × 0.6 mm	8	6	16	9.5	Fully Threaded	—	000000000	0000
		M4 × 0.7 mm	8	6	16	9.5	Fully Threaded	DIN 466	000000000	0000
		M5 × 0.8 mm	10	7.5	20	11.5	Fully Threaded	DIN 466	000000000	0000
		M6 × 1 mm	12	10	24	15	Fully Threaded	DIN 466	000000000	0000
		M8 × 1.25 mm	16	12	30	18	Fully Threaded	DIN 466	000000000	00000
		M10 × 1.5 mm	20	15	36	23	Fully Threaded	DIN 466	000000000	00000
		M12 × 1.75 mm	19	12	25.4	22	Fully Threaded	—	000000000	00000
		M14 × 2 mm	28	20	56	30	Fully Threaded	—	000000000	00000
		M16 × 2 mm	32	25	64	35	Fully Threaded	—	000000000	00000

		Black-Oxide 18-8 Stainless Steel


				M2 × 0.4 mm	5	4	10	6	Fully Threaded	—	000000000	0000
				M3 × 0.5 mm	6	5	12	7.5	Fully Threaded	DIN 466	000000000	0000
				M4 × 0.7 mm	8	6	16	9.5	Fully Threaded	DIN 466	000000000	0000
				M5 × 0.8 mm	10	7.5	20	11.5	Fully Threaded	DIN 466	000000000	0000
				M6 × 1 mm	12	10	24	15	Fully Threaded	DIN 466	000000000	0000
				M8 × 1.25 mm	16	12	30	18	Fully Threaded	DIN 466	000000000	00000
				M10 × 1.5 mm	20	15	36	23	Fully Threaded	DIN 466	000000000	00000
				M12 × 1.75 mm	19	12	25.4	22	Fully Threaded	—	000000000	0000

Plastic

Reinforced Acetal—The best plastic for damp and wet environments, acetal won't swell or lose strength if exposed to moisture. These nuts are reinforced with an aluminum threaded insert, so they can handle more torque than other plastic nuts and won't crack during installation.

		Collar, mm
	Thread Size	Dia.	Ht.	Head Dia., mm	Ht., mm	Color	Threading	Insert Material	Pkg. Qty.		Pkg.
Reinforced Acetal


		M3 × 0.5 mm	9.1	1.2	9.6	5.6	Black	Fully Threaded	Aluminum	10	000000000	00000
		M4 × 0.7 mm	9.9	2.4	13	6.7	Black	Fully Threaded	Aluminum	10	000000000	0000
		M5 × 0.8 mm	11.5	3.2	16	7.5	Black	Fully Threaded	Aluminum	10	000000000	0000
		M6 × 1 mm	13.6	4.8	19	9.1	Black	Fully Threaded	Aluminum	10	000000000	00000
		M6 × 1 mm	14.3	1.6	26	9.1	Black	Fully Threaded	Aluminum	10	000000000	00000
		M8 × 1.25 mm	16.3	3.2	26	10.7	Black	Fully Threaded	Aluminum	10	000000000	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.

Passivated 18-8 Stainless Steel—With an added layer of protection, these nuts stand up to strong acids and other harsh chemicals.

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


		M1.6 × 0.35 mm	4	4	6	6	Fully Threaded	000000000	00000
		M1.6 × 0.35 mm	4	4	8	6	Fully Threaded	000000000	0000
		M2 × 0.4 mm	4	2	6	4	Fully Threaded	000000000	0000
		M2 × 0.4 mm	4	4	8	6	Fully Threaded	000000000	0000
		M2.5 × 0.45 mm	4	5	12	7	Fully Threaded	000000000	0000
		M2.5 × 0.45 mm	5	3	6	6	Fully Threaded	000000000	0000
		M2.5 × 0.45 mm	6	3	8	6	Fully Threaded	000000000	0000
		M3 × 0.5 mm	6	3	8	6	Fully Threaded	000000000	0000
		M3 × 0.5 mm	6	5	16	8	Fully Threaded	000000000	0000
		M3.5 × 0.6 mm	9	4	10	7	Fully Threaded	000000000	0000
		M4 × 0.7 mm	8	6	12	10	Fully Threaded	000000000	0000
		M4 × 0.7 mm	8	6	20	10	Fully Threaded	000000000	00000
		M4 × 0.7 mm	9	4	10	7	Fully Threaded	000000000	0000
		M5 × 0.8 mm	10	7.5	16	12	Fully Threaded	000000000	0000
		M5 × 0.8 mm	10	7.5	24	12	Fully Threaded	000000000	00000
		M5 × 0.8 mm	11	5	13	9	Fully Threaded	000000000	0000
		M6 × 1 mm	12	5	13	9	Fully Threaded	000000000	0000
		M6 × 1 mm	12	10	20	15	Fully Threaded	000000000	00000
		M6 × 1 mm	12	10	24	15	Fully Threaded	000000000	00000
		M8 × 1.25 mm	16	6	19	12	Fully Threaded	000000000	0000
		M8 × 1.25 mm	16	12	24	18	Fully Threaded	000000000	00000
		M8 × 1.25 mm	16	12	31.8	18	Fully Threaded	000000000	00000
		M10 × 1.5 mm	20	15	26	23	Fully Threaded	000000000	00000
		M10 × 1.5 mm	20	15	31.8	23	Fully Threaded	000000000	00000
		M12 × 1.75 mm	24	20	31.8	30	Fully Threaded	000000000	00000

		Black-Oxide 18-8 Stainless Steel


				M2.5 × 0.45 mm	5	3	6	6	Fully Threaded	000000000	0000
				M3 × 0.5 mm	6	3	8	6	Fully Threaded	000000000	0000
				M3.5 × 0.6 mm	9	4	10	7	Fully Threaded	000000000	0000
				M4 × 0.7 mm	9	4	10	7	Fully Threaded	000000000	0000
				M5 × 0.8 mm	11	5	13	9	Fully Threaded	000000000	0000
				M6 × 1 mm	12	5	13	9	Fully Threaded	000000000	0000
				M8 × 1.25 mm	16	6	19	12	Fully Threaded	000000000	00000

				Passivated 18-8 Stainless Steel


						M2.5 × 0.45 mm	5	3	6	6	Fully Threaded	000000000	0000
						M3 × 0.5 mm	6	3	8	6	Fully Threaded	000000000	0000
						M4 × 0.7 mm	9	4	10	7	Fully Threaded	000000000	0000
						M5 × 0.8 mm	11	5	13	9	Fully Threaded	000000000	0000
						M6 × 1 mm	12	5	13	9	Fully Threaded	000000000	0000
						M8 × 1.25 mm	16	6	19	12	Fully Threaded	000000000	00000

Brass

Zinc-Plated Brass—The zinc plating offers better corrosion resistance than plain brass to stand up to solvents and mild chemicals.

		Collar, mm
	Thread Size	Dia.	Ht.	Head Dia., mm	Ht., mm	Threading		Each
Zinc-Plated Brass


		M2.5 × 0.45 mm	5	3	6	6	Fully Threaded	000000000	00000
		M3 × 0.5 mm	6	3	8	6	Fully Threaded	000000000	0000
		M3.5 × 0.6 mm	9	4	10	7	Fully Threaded	000000000	0000
		M4 × 0.7 mm	9	4	10	7	Fully Threaded	000000000	0000
		M5 × 0.8 mm	11	5	13	9	Fully Threaded	000000000	0000
		M6 × 1 mm	12	5	13	9	Fully Threaded	000000000	0000
		M8 × 1.25 mm	16	6	19	12	Fully Threaded	000000000	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


		M4 × 0.7 mm	8	0.5	16	4	DIN 467	1	000000000	00000
		M5 × 0.8 mm	10	1	20	5	DIN 467	1	000000000	0000
		M6 × 1 mm	12	1	24	6	DIN 467	1	000000000	0000
		M8 × 1.25 mm	16	2	30	8	DIN 467	1	000000000	0000
		M10 × 1.5 mm	20	2	36	10	DIN 467	1	000000000	0000
		M12 × 1.75 mm	20	2	36	10	DIN 467	1	000000000	0000

Sanitary Spade-Head Thumb Nuts

Cover and protect threads in sanitary environments, such as food-processing and pharmaceutical plants. These thumb nuts have smooth surfaces, rounded edges, and no holes or gaps where bacteria could grow. Twist the spade head to tighten them by hand, without the need for tools that could scratch equipment.

Corrosion-Resistant Stainless Steel

Narrow

Profile

Standard Profile

Super-Corrosion-Resistant 316 Stainless Steel—Won't corrode from frequent washdowns and can stand up to the harshest cleaners and detergents.

Narrow Profile—Slimmer than standard-profile nuts to fit in tight spaces.

Standard Profile—The wide gripping area gives you more leverage than narrow-profile nuts, so you can apply more torque for a tighter fit.

	Base Dia., mm	Thread Dp., mm	Threading		Each
Super-Corrosion-Resistant 316 Stainless Steel





	Narrow Profile
	M4 × 0.7 mm	9	20	9	6	Partially Threaded	000000000	000000
	M5 × 0.8 mm	10	22	10	6	Partially Threaded	000000000	00000
	M6 × 1 mm	12	22	12	7	Partially Threaded	000000000	00000
	M8 × 1.25 mm	16	25	16	9	Partially Threaded	000000000	00000
	M10 × 1.5 mm	20	30	20	11	Partially Threaded	000000000	00000



			Standard Profile
			M4 × 0.7 mm	20	19	10.8	6	Partially Threaded	000000000	00000
			M5 × 0.8 mm	21	21	11.8	6	Partially Threaded	000000000	00000
			M6 × 1 mm	25	25	14.2	7	Partially Threaded	000000000	00000
			M8 × 1.25 mm	33	33	18	9	Partially Threaded	000000000	00000
			M10 × 1.5 mm	40	40	22.3	11	Partially Threaded	000000000	00000

Wing Nuts


Style 1	Style 4	Style 5	Style 7	Style 8

The easiest nuts to twist on and off by hand, these are commonly used to fasten parts that need to be frequently disassembled, such as access panels and covers. The wings give you more leverage than knurled-head nuts, so you can apply greater torque and achieve a tighter fit.

Steel


Style 1	Style 4	Style 5	Style 7	Style 8

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.

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





	Style 1
	M3 × 0.5 mm	19.5	10	8	ISO Class 5	—	25	000000000	00000
	M4 × 0.7 mm	17.6	8.6	8	ISO Class 5	DIN 315	50	000000000	00000
	M5 × 0.8 mm	22.5	11	10.3	ISO Class 5	DIN 315	25	000000000	0000
	M6 × 1 mm	27.8	13.6	12.7	ISO Class 5	DIN 315	25	000000000	0000
	M8 × 1.25 mm	30.3	14.8	13.8	ISO Class 5	DIN 315	20	000000000	0000
	M10 × 1.5 mm	36.2	17.7	16.5	ISO Class 5	DIN 315	10	000000000	0000
	M12 × 1.75 mm	49.4	24.1	22.5	ISO Class 5	DIN 315	5	000000000	0000



			Style 4
			M4 × 0.7 mm	20	10.5	8	ISO Class 5	DIN 315	10	000000000	0000
			M5 × 0.8 mm	26	13	11	ISO Class 5	DIN 315	10	000000000	0000
			M6 × 1 mm	33	17	13	ISO Class 5	DIN 315	10	000000000	00000
			M8 × 1.25 mm	39	20	16	ISO Class 5	DIN 315	5	000000000	0000
			M10 × 1.5 mm	51	25	20	ISO Class 5	DIN 315	5	000000000	00000
			M12 × 1.75 mm	65	33.5	23	ISO Class 5	DIN 315	1	000000000	0000
			M16 × 2 mm	73	37.5	29	ISO Class 5	DIN 315	1	000000000	0000



					Style 5
					M6 × 1 mm	34.9	15.9	12.7	—	—	5	000000000	00000
					M8 × 1.25 mm	36.5	17.5	12.7	—	—	5	000000000	00000
					M16 × 2 mm	69.9	30.2	26.99	—	—	1	000000000	00000



							Style 7
							M6 × 1 mm	25.4	11.9	19.05	—	—	5	000000000	00000
							M6 × 1 mm	27	17.5	16	—	—	5	000000000	00000
							M6 × 1 mm	38.1	14.3	22.22	—	—	1	000000000	0000
							M8 × 1.25 mm	38.1	14.3	22.22	—	—	1	000000000	0000
							M8 × 1.25 mm	41.3	25.4	22.23	—	—	5	000000000	00000
							M10 × 1.5 mm	41.3	25.4	22.23	—	—	1	000000000	0000



									Style 8
									M8 × 1.25 mm	76.2	19.1	24.5	—	—	1	000000000	0000
									M10 × 1.5 mm	76.2	19.1	24.5	—	—	1	000000000	0000
									M12 × 1.75 mm	76.2	19.1	24.5	—	—	1	000000000	0000

									Steel





													Style 8
													M8 × 1.25 mm	76.2	19.1	24.5	—	—	1	000000000	0000
													M10 × 1.5 mm	76.2	19.1	24.5	—	—	1	000000000	0000
													M12 × 1.75 mm	76.2	19.1	24.5	—	—	1	000000000	0000

Iron

Style 5

Zinc-Plated Iron—A step up from plain iron, the zinc plating withstands occasional exposure to moisture.

	Base Dia., mm	Pkg. Qty.		Pkg.
Zinc-Plated Iron





	Style 5
	M5 × 0.8 mm	28.6	12.7	9.53	5	000000000	000000
	M10 × 1.5 mm	41.3	20.6	16	1	000000000	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.

Super-Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant thumb nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Base Dia., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel





	Style 1
	M3 × 0.5 mm	19.5	10	8	—	25	000000000	000000
	M4 × 0.7 mm	21.5	10.3	9	DIN 315	10	000000000	0000
	M5 × 0.8 mm	21.5	10.3	10.5	DIN 315	10	000000000	0000
	M6 × 1 mm	26.3	12.7	13	DIN 315	10	000000000	0000
	M8 × 1.25 mm	30.1	15.1	15.25	DIN 315	10	000000000	0000
	M10 × 1.5 mm	34.9	18.3	18	DIN 315	5	000000000	0000
	M12 × 1.75 mm	47.6	23.8	23	DIN 315	1	000000000	0000
	M14 × 2 mm	58.3	28.5	26.6	DIN 315	1	000000000	0000
	M16 × 2 mm	58.3	28.5	26.6	DIN 315	1	000000000	00000
	M18 × 2.5 mm	68.5	33.8	29.5	DIN 315	1	000000000	00000
	M20 × 2.5 mm	68.5	33.8	29.5	DIN 315	1	000000000	00000

	Super-Corrosion-Resistant 316 Stainless Steel





					Style 1
					M3 × 0.5 mm	19.5	10	8	—	10	000000000	00000
					M4 × 0.7 mm	19.5	10	8	—	10	000000000	00000
					M5 × 0.8 mm	23	12	10.3	—	10	000000000	00000
					M6 × 1 mm	26.3	12.7	13	DIN 315	5	000000000	0000
					M8 × 1.25 mm	30.1	15.1	15.25	DIN 315	5	000000000	00000
					M10 × 1.5 mm	34.93	18.3	18	DIN 315	1	000000000	0000
					M12 × 1.75 mm	49.4	22.3	22.5	DIN 315	1	000000000	0000
					M14 × 2 mm	52.7	30.8	26	DIN 315	1	000000000	00000
					M16 × 2 mm	58.3	30.8	26.6	DIN 315	1	000000000	00000

Plastic

Style 1

Nylon 6/6—These nuts thread on smoothly and resist abrasion to stand up to scratches and bumps. Nylon will swell and weaken when exposed to moisture, so it's best for dry environments.

	Base Dia., mm	Choose a Color	Pkg. Qty.		Pkg.
Nylon 6/6





	Style 1
	M4 × 0.7 mm	22.8	12.2	10.2	Black , Off-White	50	000000000	000000
	M5 × 0.8 mm	22.8	12.2	10.2	Black , Off-White	50	000000000	00000
	M6 × 1 mm	27.7	16	14.2	Black , Off-White	50	000000000	00000
	M8 × 1.25 mm	34.8	18.3	16.2	Black , Off-White	50	000000000	00000
	M10 × 1.5 mm	34.8	18.3	16.2	Black , Off-White	50	000000000	00000
	M12 × 1.75 mm	42.2	22.7	21.4	Black , Off-White	25	000000000	00000