Metric Thumb Screw Nuts | McMaster-Carr

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About Nuts, Materials, and Finishes

Made from 18-8 stainless steel, these metric thumb nuts have good chemical resistance and may be mildly magnetic. The head is knurled for slip-resistant controlled adjustment and the collar raises the head to make it easy to grip.

Black-oxide stainless steel nuts have a dark surface color.

For technical drawings and 3-D models, click on a part number.

Thread		Collar
Size	Pitch, mm	Dia., mm	Ht., mm	Head Dia., mm	Ht., mm	Specifications Met		Each
18-8 Stainless Steel
M2	0.4	5	4	10	6	__	000000000	00000
M2.5	0.45	6	5	12	7.5	__	000000000	0000
M3	0.5	6	5	12	7.5	DIN 466	000000000	0000
M3.5	0.6	8	6	16	9.5	__	000000000	0000
M4	0.7	8	6	16	9.5	DIN 466	000000000	0000
M5	0.8	10	7.5	20	11.5	DIN 466	000000000	0000
M6	1	12	10	24	15	DIN 466	000000000	0000
M8	1.25	16	12	30	18	DIN 466	000000000	0000
M10	1.5	20	15	36	23	DIN 466	000000000	00000
M12	1.75	19	12	25.4	22	__	000000000	00000
M14	2	28	20	56	30	__	000000000	00000
M16	2	32	25	64	35	__	000000000	00000
Black-Oxide 18-8 Stainless Steel
M2	0.4	5	4	10	6	__	000000000	0000
M3	0.5	6	5	12	7.5	DIN 466	000000000	0000
M4	0.7	8	6	16	9.5	DIN 466	000000000	0000
M5	0.8	10	7.5	20	11.5	DIN 466	000000000	0000
M6	1	12	10	24	15	DIN 466	000000000	0000
M8	1.25	16	12	30	18	DIN 466	000000000	00000
M10	1.5	20	15	36	23	DIN 466	000000000	00000
M12	1.75	19	12	25.4	22	__	000000000	0000

Reinforced Plastic Knurled-Head Thumb Nuts

An aluminum insert with strong threads withstands more torque during installation. They're chemical resistant, nonconductive, and lightweight. The head is knurled for slip-resistant controlled adjustment and the collar raises the head to make it easy to grip.

For technical drawings and 3-D models, click on a part number.

Thread		Collar
Size	Pitch, mm	Dia., mm	Ht., mm	Head Dia., mm	Ht., mm	Temp. Range, °F	Color	Pkg. Qty.		Pkg.
Acetal Plastic
M3	0.5	9.1	1.2	9.6	5.6	32° to 180°	Black	10	000000000	00000
M4	0.7	9.9	2.4	13	6.7	32° to 180°	Black	10	000000000	0000
M5	0.8	11.5	3.2	16	7.5	32° to 180°	Black	10	000000000	0000
M6	1	13.6	4.8	19	9.1	32° to 180°	Black	10	000000000	0000
M6	1	14.3	1.6	26	9.1	32° to 180°	Black	10	000000000	00000
M8	1.25	16.3	3.2	26	10.7	32° to 180°	Black	10	000000000	00000

Metric 18-8 Stainless Steel Flanged Knurled-Head Thumb Nuts

Made from 18-8 stainless steel, these thumb nuts have good chemical resistance and may be mildly magnetic. The flange distributes the load over a large area and reduces stress where the nut meets the material surface. A knurled head provides a slip-resistant grip for controlled adjustment.

Passivated stainless steel nuts provide added protection against oxidation and corrosion.

For technical drawings and 3-D models, click on a part number.

Thread		Collar
Size	Pitch, mm	Dia., mm	Ht., mm	Head Dia., mm	Ht., mm		Each
18-8 Stainless Steel
M1.6	0.35	4	4	6	6	000000000	00000
M1.6	0.35	4	4	8	6	000000000	0000
M2	0.4	4	2	6	4	000000000	0000
M2	0.4	4	4	8	6	000000000	0000
M2.5	0.45	4	5	12	7	000000000	0000
M2.5	0.45	5	3	6	6	000000000	0000
M2.5	0.45	6	3	8	6	000000000	0000
M3	0.5	6	3	8	6	000000000	0000
M3	0.5	6	5	16	8	000000000	0000
M3.5	0.6	9	4	10	7	000000000	0000
M4	0.7	8	6	12	10	000000000	0000
M4	0.7	8	6	20	10	000000000	0000
M4	0.7	9	4	10	7	000000000	0000
M5	0.8	10	7.5	16	12	000000000	0000
M5	0.8	10	7.5	24	12	000000000	00000
M5	0.8	11	5	13	9	000000000	0000
M6	1	12	5	13	9	000000000	0000
M6	1	12	10	20	15	000000000	0000
M6	1	12	10	24	15	000000000	00000
M8	1.25	16	6	19	12	000000000	0000
M8	1.25	16	12	24	18	000000000	00000
M8	1.25	16	12	31.8	18	000000000	00000
M10	1.5	20	15	26	23	000000000	00000
M10	1.5	20	15	31.8	23	000000000	00000
M12	1.75	24	20	31.8	30	000000000	00000
Black-Oxide 18-8 Stainless Steel
M2.5	0.45	5	3	6	6	000000000	0000
M3	0.5	6	3	8	6	000000000	0000
M3.5	0.6	9	4	10	7	000000000	0000
M4	0.7	9	4	10	7	000000000	0000
M5	0.8	11	5	13	9	000000000	0000
M6	1	12	5	13	9	000000000	0000
M8	1.25	16	6	19	12	000000000	0000
Passivated 18-8 Stainless Steel
M2.5	0.45	5	3	6	6	000000000	0000
M3	0.5	6	3	8	6	000000000	0000
M4	0.7	9	4	10	7	000000000	0000
M5	0.8	11	5	13	9	000000000	0000
M6	1	12	5	13	9	000000000	0000
M8	1.25	16	6	19	12	000000000	0000

Metric Brass Flanged Knurled-Head Thumb Nuts

Made from zinc-plated brass, these thumb nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. The flange distributes the load over a large area and reduces stress where the nut meets the material surface. A knurled head provides a slip-resistant grip for controlled adjustment.

For technical drawings and 3-D models, click on a part number.

Thread		Collar
Size	Pitch, mm	Dia., mm	Ht., mm	Head Dia., mm	Ht., mm		Each
Zinc-Plated Brass
M2.5	0.45	5	3	6	6	000000000	00000
M3	0.5	6	3	8	6	000000000	0000
M3.5	0.6	9	4	10	7	000000000	0000
M4	0.7	9	4	10	7	000000000	0000
M5	0.8	11	5	13	9	000000000	0000
M6	1	12	5	13	9	000000000	0000
M8	1.25	16	6	19	12	000000000	0000

About Nuts, Materials, and Finishes

Metric 18-8 Stainless Steel Knurled-Head Thumb Nuts

Reinforced Plastic Knurled-Head Thumb Nuts

Metric 18-8 Stainless Steel Flanged Knurled-Head Thumb Nuts

Metric Brass Flanged Knurled-Head Thumb Nuts