3 1/4" Aluminum Sheets | McMaster-Carr

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.

Aluminum that meets an SAE AMS standard conforms to the material and process needs of the aerospace industry.

If you don’t see the sheet or bar size you need, please specify dimensions under additional sheet sizes or additional bar lengths.

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

Bars

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

3 1/4" Thick.
Wd.	Thick. Tolerance	Fabrication	Temper	Heat Treatment	Temp. Range, °F	Specifications Met		1/2 ft. Lg.	1 ft. Lg.	2 ft. Lg.	3 ft. Lg.	6 ft. Lg.
3 1/4"	-0.024" to 0.024"	Extruded	T6511	Hardened	-320° to 300°	ASTM B221, SAE AMS QQ-A-200/8	0000000	000000	0000000	0000000	0000000	0000000

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 and mounting plates.

Heat treatable material can be surface hardened for added wear resistance.

Steel that meets ASTM specifications complies with standards for manufacturing and performance.

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

Bars

Yield Strength: 54,000 psi
Hardness: Rockwell B70 (Medium)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C60
Fabrication: Cold Drawn
Specifications Met: ASTM A108

3 1/4" Thick.
Wd.	Thick. Tolerance		1/2 ft. Lg.	1 ft. Lg.	3 ft. Lg.
3 1/4"	-0.006" to 0"	00000000	0000000	0000000	0000000

Easy-to-Machine Impact-Resistant Ductile Cast Iron Bars

Yield Strength: 45,000 psi
Hardness: Rockwell C10 (Medium)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C50
Specifications Met: ASTM A536

Easier to machine without cracking than other impact-resistant ductile cast iron bars, these cast iron bars contain a high amount of ferrite. Use them to make cylinder and die blocks, rotary tables, and rail spacers. These bars are also known as 65-45-12 ductile iron bars. All conduct electricity. They will become magnetic if exposed to a magnetic field. They’re often used to replace low and medium carbon steel bars.

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

3 1/4" Thick. (0" to 0.25" Tolerance)
Width		1 ft. Lg.	2 ft. Lg.
3 1/4"	0000000	0000000	0000000
4 1/4"	00000000	000000	00