A500 Low-Carbon Steel | McMaster-Carr

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30,000 psi to 39,999 psi

40,000 psi to 99,999 psi

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Material Certificate with Traceable Lot Number

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Multipurpose

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Yes

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25 Products

About Steel

Compare over 50 grades of steel and cast iron to find the right material for you—all with material certificates for traceability.

Multipurpose Low-Carbon Steel Rectangular Tubes

Also known as mild steel, low-carbon steel is easy to machine, form, and weld. These tubes are often fabricated into parts that don’t require high strength, such as frames, supports, and raceways. To increase their wear resistance, you can surface harden them with heat treating.

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

	Outside		Inside		Corner Shape
	Ht.	Wd.	Ht.	Wd.	Inside	Outside	Fabrication	Mechanical Tube Type	Yield Strength, psi	Hardness	Max. Hardness After Heat Treatment	Specs. Met		1/2 ft. Long	1 ft. Long	2 ft. Long	3 ft. Long	4 ft. Long	6 ft. Long	8 ft. Long	12 ft. Long







				1/8" Thick Wall

				1"	2"	3/4"	1 3/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K527	—	000000	—	000000	—	000000	—	—


				1"	3"	3/4"	2 3/4"	Round	Round	Welded	ERW	32,000	Not Rated	Not Rated	ASTM A500	6527K46	—	00000	—	00000	000000	00000	000000	—
				1 1/2"	1 1/2"	1 1/4"	1 1/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K566	—	00000	—	00000	—	00000	—	—
				1 1/2"	2 1/2"	1 1/4"	2 1/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K502	—	00000	—	00000	—	00000	—	—
				1 1/2"	3"	1 1/4"	2 3/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K47	—	00000	—	00000	00000	00000	00000	—
				2"	2"	1 3/4"	1 3/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K914	—	00000	—	00000	—	00000	—	—
				2"	3"	1 3/4"	2 3/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K934	—	00000	—	00000	—	00000	—	—




						0.188" Thick Wall

						1 1/4"	1 1/4"	0.874"	0.874"	Round	Round	Welded	ERW	39,000	Not Rated	Not Rated	ASTM A500	6527K48	000000	00000	000000	00000	00000	00000	000000	—


						1 1/2"	3"	1.124"	2.624"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K49	—	00000	—	00000	00000	00000	000000	—
						2"	4"	1.624"	3.624"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K707	—	00000	—	00000	—	000000	—	—
						2 1/2"	2 1/2"	2.124"	2.124"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K54	—	00000	00000	00000	00000	000000	000000	—
						3"	4"	2.624"	3.624"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K616	—	00000	—	00000	—	000000	—	—
						4"	6"	3.624"	5.624"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K109	—	00000	—	000000	—	000000	—	—
						5"	5"	4.624"	4.624"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K702	—	00000	—	000000	—	000000	—	—
						6"	6"	5.624"	5.624"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K704	—	00000	—	000000	—	000000	—	—




								1/4" Thick Wall

								1 1/2"	3"	1"	2 1/2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K55	00000	00000	00000	00000	00000	000000	000000	—


								2"	3"	1 1/2"	2 1/2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K708	—	00000	—	00000	—	000000	—	—
								2"	4"	1 1/2"	3 1/2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K719	—	00000	—	00000	—	000000	—	—
								2"	6"	1 1/2"	5 1/2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K807	—	00000	—	000000	—	000000	—	—
								2 1/2"	2 1/2"	2"	2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K56	00000	00000	00000	00000	000000	000000	000000	0000000
								3"	4"	2 1/2"	3 1/2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K705	—	00000	—	000000	—	000000	—	—
								4"	6"	3 1/2"	5 1/2"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K967	—	00000	—	000000	—	000000	—	—




										3/8" Thick Wall

										6"	6"	5 1/4"	5 1/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K579	00000	000000	—	000000	—	—	—	—


										8"	8"	7 1/4"	7 1/4"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K813	00000	000000	—	000000	—	—	—	—




												1/2" Thick Wall

6"	6"											5"	5"	Round	Round	Welded	ERW	46,000	Not Rated	Not Rated	ASTM A500	6527K864	00000	000000	—	000000	—	—	—	—