3mm Aluminum Plates | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Fabrication Fabrication

Cold Worked

Extruded

Hot Rolled

	Temper Temper

	Heat Treatable Heat Treatable

Yes

	Hardness Hardness

	Elongation Elongation

	Yield Strength Yield Strength

20,000 to 99,999 psi

	Specifications Met Specifications Met

80 Products

About Tool Steel

About Stainless Steel

About Aluminum

About Rubber

About Carbon Steel, Alloy Steel, Spring Steel, and Cast Iron

The most widely used aluminum, 6061 is fabricated into everything from pipe fittings and containers to automotive and aerospace parts. It is strong and corrosion resistant, plus it's easy to machine and weld.

Extruded sheets and bars are formed by a die for close-tolerance widths, then cut to the lengths listed.

Aluminum that meets ASTM B209 or ASTM B221 complies with standards for materials.

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

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

Metric Bars

Yield Strength: 35,000 psi
Hardness: Brinell 95 (Soft)
Temper: T6
Fabrication: See table
Specifications Met: ASTM B221

3 mm Thick. (-0.152 to 0.152 mm Tolerance)
Wd., mm	Fabrication	Heat Treatment	Temperature Range, °F	Flatness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
5	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	00	00000	00000
10	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	00	0000	0000
15	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	00000	0000	0000
20	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	0000	0000	00000
25	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	0000	0000	00000
30	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	0000	0000	00000
40	Extruded	Hardened	-320° to 300°	0.006" per in.	0000000	0000	00000	00000

Low-Carbon Steel Sheets and Bars

Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as fixture clamps, mounting plates, and spacers. Some of this material can be surface hardened with heat treating.

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

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

Metric Bars

Yield Strength: 34,000 psi
Hardness: Rockwell B90 (Medium)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Not Rated

3 mm Thickness (-0.06 to 0 mm Tolerance)
Wd., mm		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
6	0000000	00000	00000	000000
12	0000000	0000	0000	00000
20	0000000	0000	00000	00000
25	0000000	0000	00000	00000

Tight-Tolerance Low-Carbon Steel Bars

With a thickness that's precision ground to a tight tolerance, these bars are sometimes called flat stock. Low-carbon steel, also known as mild steel, is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as fixture clamps, mounting plates, and spacers. This material can be surface hardened with heat treating. All steel meets ASTM A36 standards for materials.

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

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

Metric Bars

Yield Strength: 36,000 psi
Hardness: Not Rated
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C65

3 mm Thick. (-0.025 to 0.025 mm Tolerance)
Wd., mm	Mechanical Finish	Specifications Met		1 ft. Lg.	2 ft. Lg.
10	Precision Ground	ASTM A36	00000000	000000	000000
15	Precision Ground	ASTM A36	00000000	00000	00000
20	Precision Ground	ASTM A36	00000000	00000	00000
25	Precision Ground	ASTM A36	00000000	00000	00000

Low-Carbon Steel Bars with Rounded Edges

Yield Strength: 35,000 psi
Hardness: Rockwell B65 (Medium)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C60

Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as fixture clamps, mounting plates, and spacers. This material can be surface hardened with heat treating.

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

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

Metric Bars

3mm Thick. (-0.09mm to 0.09mm Tolerance)
Wd., mm		1 5/8 ft. Lg.	3 1/4 ft. Lg.	6 1/2 ft. Lg.
25	0000000	000000	000000	000000
50	0000000	00000	00000	00000

Multipurpose 304 Stainless Steel

From cookware to chemical-processing equipment, 304 stainless steel is a good all-around choice for a wide range of applications. It maintains its corrosion resistance in temperatures up to 1500° F.

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

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

304 Stainless Steel Bars

Yield Strength: 30,000 psi
Hardness: See Table
Heat Treatment: Annealed (Softened)
Heat Treatable: No
Specifications Met: See Table

3 mm Thick. (-0.06 mm to 0 mm Tolerance)
Wd.	Wd. Tolerance	Fabrication	Hardness	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
12mm	-0.11mm to 0mm	Cold Worked	Rockwell B80 (Medium)	Not Rated	0000000	000000	000000	000000
20mm	-0.13mm to 0mm	Cold Worked	Rockwell B80 (Medium)	Not Rated	0000000	00000	00000	000000
25mm	-0.13mm to 0mm	Cold Worked	Rockwell B80 (Medium)	Not Rated	0000000	00000	00000	000000

Tight-Tolerance Multipurpose Oil-Hardening O1 Tool Steel Sheets and Bars

Also known as flat stock, these precision-ground sheets and bars are held to a tight thickness tolerance. Often used for dies, punches, and gauges, O1 tool steel is an oil-hardening material that resists wear and abrasion.

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

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

Metric Bars

Yield Strength: 80,000 psi
Hardness: Rockwell B90 (Medium)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C65
Specifications Met: ASTM A681

				3 ft. Lg.
Wd., mm	Heat Treatment	Mechanical Finish	Flatness Tolerance		Each
3 mm Thick. (0 mm to 0.05 mm Tolerance)
15	Annealed (Softened)	Precision Ground	0.005" per ft.	0000000	000000
25	Annealed (Softened)	Precision Ground	0.005" per ft.	0000000	00000
100	Annealed (Softened)	Precision Ground	0.005" per ft.	0000000	000000

Flat-Surface Machine Brackets

Used for mounting applications on machines and automated equipment, these brackets are made to meet tight dimensional tolerances.

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

Lg.						Mounting
(A)	(C)	Lg. Tolerance	Thick.	Thick. Tolerance	Flatness Tolerance	Fasteners Included	Number of Slots	For Screw Size		Each
Metric
6061 Aluminum
60mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	No	2	M6	0000000	00000
75mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	No	2	M8	0000000	0000
316 Stainless Steel
60mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	No	2	M6	0000000	0000
75mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	No	2	M8	0000000	0000

Finish-Your-Own Flat-Surface Machine Brackets

Machine holes and slots or weld in place. Used for mounting applications on machines and automated equipment, these brackets are made to meet tight dimensional tolerances.

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

Lg.
(A)	(C)	Lg. Tolerance	Thick.	Thick. Tolerance	Flatness Tolerance		Each
Metric
6061 Aluminum
60mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	00000
75mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000
75mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000
100mm	25mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000
316 Stainless Steel
60mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000
75mm	20mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000
75mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000
100mm	25mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	-0.38mm to 0.38mm	0000000	0000

Corner Machine Brackets

With Two Mounting Slots

With Four Mounting Slots

Made to meet tight dimensional tolerances for mounting applications on machines and automated equipment.

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

Lg.										Mounting
(A)	(B)	(C)	Lg. Tolerance	Thick.	Thick. Tolerance	Angle	Angle Tolerance	Corner Radius	Flatness Tolerance	Fasteners Included	Number of Slots	For Screw Size		Each
Metric
6061 Aluminum
35mm	30mm	30mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	2	M6	0000000	00000
50mm	50mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	2	M10	0000000	0000
75mm	50mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	2	M12	0000000	00000
75mm	60mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M10	0000000	00000
80mm	40mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M6	0000000	00000
100mm	60mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M12	0000000	00000
316 Stainless Steel
35mm	30mm	30mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	2	M6	0000000	0000
50mm	50mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	2	M10	0000000	0000
75mm	50mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	2	M12	0000000	00000
75mm	60mm	75mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M10	0000000	00000
80mm	40mm	60mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M6	0000000	00000
100mm	60mm	75mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M12	0000000	00000

Finish-Your-Own Corner Machine Brackets

Machine holes and slots or weld in place. These brackets are made to meet tight dimensional tolerances for mounting applications on machines and automated equipment.

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

Lg.
(A)	(B)	(C)	Lg. Tolerance	Thick.	Thick. Tolerance	Angle	Angle Tolerance	Corner Radius	Flatness Tolerance		Each
Metric
6061 Aluminum
35mm	30mm	30mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
50mm	50mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	0000
75mm	50mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
75mm	60mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
80mm	40mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
100mm	60mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
316 Stainless Steel
35mm	30mm	30mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	0000
50mm	50mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	0000
75mm	50mm	50mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
75mm	60mm	75mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000
80mm	40mm	60mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000

Offset-Surface Machine Brackets

With tight dimensional tolerances, these brackets are good for mounting applications on machines and automated equipment.

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

Lg.											Mounting
(A)	(B)	(C)	Offset	Lg. Tolerance	Thick.	Thick. Tolerance	Angle	Angle Tolerance	Corner Radius	Flatness Tolerance	Fasteners Included	Number of Slots	For Screw Size		Each
Metric
316 Stainless Steel
40mm	45mm	45mm	25mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M6	0000000	000000
50mm	65mm	60mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	No	4	M8	0000000	00000

Finish-Your-Own Offset-Surface Machine Brackets

Machine holes and slots or weld in place. With tight dimensional tolerances, these brackets are good for mounting applications on machines and automated equipment.

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

Lg.
(A)	(B)	(C)	Offset	Lg. Tolerance	Thick.	Thick. Tolerance	Angle	Angle Tolerance	Corner Radius	Flatness Tolerance		Each
Metric
316 Stainless Steel
40mm	45mm	45mm	25mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	000000
50mm	65mm	60mm	40mm	-0.5mm to 0.5mm	3mm	-0.2mm to 0.2mm	90°	-1° to 1°	3.2mm	-0.38mm to 0.38mm	0000000	00000

Sensor and Switch Mounting Brackets

Position proximity, photoelectric, and light beam sensors and switches.

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

			Lg., mm				Mounting
Style	For Sensor/Switch OD, mm	Material	(A)	(B)	(C)	Thick., mm	Fasteners Included	Number of Slots	For Screw Size		Each
5	12	304 Stainless Steel	32	25	29	3	No	2	M5	000000000	000000
5	16	304 Stainless Steel	32	25	29	3	No	2	M5	000000000	00000
5	18	304 Stainless Steel	38	25	39	3	No	2	M6	000000000	00000
5	22	304 Stainless Steel	38	25	39	3	No	2	M6	000000000	00000
5	24	304 Stainless Steel	38	25	39	3	No	2	M6	000000000	00000
5	30	304 Stainless Steel	51	38	54	3	No	2	M7	000000000	00000
5	36	304 Stainless Steel	51	38	54	3	No	2	M7	000000000	00000
5	47	304 Stainless Steel	64	38	70	3	No	2	M10	000000000	00000

Abrasion-Resistant Polyurethane Rubber Sheets, Bars, and Strips

This polyurethane combines the shock absorbing qualities of rubber with the tear resistance of plastic. Use it for high-tension applications such as conveyor belts, as well as for high-wear applications such as cutting surfaces, bumpers, and liners.

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

Semi-Clear to Opaque Metric Sheets

Color: Amber (semi-clear to opaque)
Temperature Range: -10° to 200° F
Tensile Strength: 5,500 psi
For Use Outdoors: Yes

			12" × 12"
Thick., mm	Thick. Tolerance, mm	Durometer		Each
3	-0.4 to +0.4	80A (Hard)	0000000	000000

High-Temperature Silicone Rubber Sheets, Bars, and Strips

Also known as polysiloxane, this silicone rubber offers good resistance to ozone and salt water. Softer durometer rubber has better conformability; harder durometer rubber is more wear resistant.

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

Metric Sheets

Color: Red
Temperature Range: -100° to 500° F
Tensile Strength: 700 psi
For Use Outdoors: Yes
Specifications Met: ASTM D2000 GE, FDA Compliant 21 CFR 177.2600, Fed. Spec. ZZ-R-765, MIL-A-A-59588

			12" × 12"		24" × 24"		36" × 36"
Thick., mm	Thick. Tolerance, mm	Durometer		Each		Each		Each
3	-0.500 to +0.500	50A (Medium)	0000000	000000	0000000	0000000	0000000	0000000

High-Strength High-Temperature Silicone Rubber Sheets and Strips

Greater strength than standard High-Temperature Silicone translates into better shock-absorbing qualities and longer life. Silicone, commonly called polysiloxane, offers good resistance to ozone and salt water.

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

Metric Sheets

Color: Red or gray
Temperature Range: -80° to 425° F
Tensile Strength: 1,200 psi
For Use Outdoors: Yes

			Red		Gray
Thick., mm	Thick. Tolerance, mm	Durometer		Each		Each
12" × 12"
3	-0.400 to +0.400	50A (Medium)	0000000	000000	0000000	000000

Metric Adhesive-Back Sheets

Color: Red or gray
Temperature Range: -80° to 425° F
Tensile Strength: 1,200 psi
For Use Outdoors: Yes

		Adhesive				Red		Gray
Thick., mm	Thick. Tolerance, mm	Type	Temp. Min., °F	Temp. Max., °F	Durometer		Each		Each
12" × 12"
3	-0.400 to +0.400	Acrylic	Not Rated	200°	50A (Medium)	00000000	000000	00000000	000000

High-Strength Oil-Resistant Buna-N Rubber Sheets and Strips

These sheets and strips offer better shock-absorbing qualities and longer life than standard Oil-Resistant Buna-N. Buna-N is also known as nitrile, NBR, and acrylonitrile butadiene. It resists fuel oil, hydraulic oil, ethylene glycol, and grease.

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

Metric Sheets

Color: Black
Temperature Range: -40° to 212° F
Tensile Strength: 1,500 psi
For Use Outdoors: No

			12" × 24"
Thick., mm	Thick. Tolerance, mm	Choose a Durometer		Each
3	-0.400 to +0.400	50A (Medium), 60A (Medium Hard), 70A (Hard)	00000000	000000

Cut-to-Length Metric Sheets

Color: Black
Temperature Range: -40° to 212° F
Tensile Strength: 1,500 psi
For Use Outdoors: No

			36" Wd.
Thick., mm	Thick. Tolerance, mm	Choose a Durometer		Per Ft.
3	-0.400 to +0.400	50A (Medium), 60A (Medium Hard), 70A (Hard)	00000000	000000

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About Tool Steel

About Stainless Steel

About Aluminum

About Rubber

About Carbon Steel, Alloy Steel, Spring Steel, and Cast Iron

Multipurpose 6061 Aluminum Sheets and Bars

Low-Carbon Steel Sheets and Bars

Tight-Tolerance Low-Carbon Steel Bars

Low-Carbon Steel Bars with Rounded Edges

Multipurpose 304 Stainless Steel

Tight-Tolerance Multipurpose Oil-Hardening O1 Tool Steel Sheets and Bars

Flat-Surface Machine Brackets

Finish-Your-Own Flat-Surface Machine Brackets

Corner Machine Brackets

Finish-Your-Own Corner Machine Brackets

Offset-Surface Machine Brackets

Finish-Your-Own Offset-Surface Machine Brackets

Sensor and Switch Mounting Brackets

Abrasion-Resistant Polyurethane Rubber Sheets, Bars, and Strips

High-Temperature Silicone Rubber Sheets, Bars, and Strips

High-Strength High-Temperature Silicone Rubber Sheets and Strips

High-Strength Oil-Resistant Buna-N Rubber Sheets and Strips