McMaster-Carr logo
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    89 Products
    About Steel
    industrial info icon

    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

    Image of Product. Front orientation. Steel. 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.
    Material Certificate Icon
    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
     
    1/16" Thick Wall
    1/2"1/2"3/8"3/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K340000000000
    1/2"1"3/8"7/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K350000000000
    3/4"3/4"5/8"5/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K390000000000
    1"1"7/8"7/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K650000000000
    1"2"7/8"1 7/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K660000000000
    1 1/4"1 1/4"1 1/8"1 1/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K670000000000000000
    1 1/2"1 1/2"1 3/8"1 3/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K680000000000
    1 3/4"1 3/4"1 5/8"1 5/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K69000000000000000
    2"2"1 7/8"1 7/8"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K77000000000000000
     
    0.065" Thick Wall
    1/2"1/2"0.37"0.37"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K15400000000000000000000000000000
    1/2"1 1/2"0.37"1.37"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K5800000000000000000000
    3/4"3/4"0.62"0.62"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K16400000000000000000000000
    3/4"1 1/2"0.62"1.37"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K780000000000
    1"1"0.87"0.87"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K1740000000000000000000000000000000000
    1 1/4"1 1/4"1.12"1.12"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K18400000000000000000000000000000
    2 1/2"2 1/2"2.37"2.37"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K79000000000000000
     
    0.083" Thick Wall
    3/4"3/4"0.584"0.584"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K25400000000000000000000000
    1"1"0.834"0.834"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K2640000000000000000000000000000000000
    1"2"0.834"1.834"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K92000000000000000000000000
    1 1/4"1 1/4"1.084"1.084"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K940000000000000000000000000000000000
    1 1/2"1 1/2"1.334"1.334"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K2740000000000000000000000000
    2"2"1.834"1.834"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K284000000000000000000000000000000
     
    0.12" Thick Wall
    3/4"3/4"0.51"0.51"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K97000000000000000000000000000000000
    3/4"1 1/2"0.51"1.26"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K1010000000000
    1"1"0.76"0.76"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K3640000000000000000000000000000000000
    1"1 1/2"0.76"1.26"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K98000000000000000000000000
    1"2"0.76"1.76"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K99000000000000000000000000000000
    1"3"0.76"2.76"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K19000000000000000
    1 1/4"1 1/4"1.01"1.01"RoundRoundWeldedERWNot RatedNot RatedNot RatedASTM A513 Type 16527K4500000000000000000000000000000000000
    1 1/2"1 1/2"1.26"1.26"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K37400000000000000000000000000000000000
    1 1/2"2 1/2"1.26"2.26"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K5900000000000000000000000000
    1 1/2"3"1.26"2.76"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K409000000000000000
    2"2"1.76"1.76"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K384000000000000000000000000000000000000
    2"3"1.76"2.76"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K6090000000000000000
    2"4"1.76"3.76"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K709000000000000000
    2"6"1.76"5.76"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K8090000000000000000
    2 1/2"2 1/2"2.26"2.26"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K509000000000000000
    3"3"2.76"2.76"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K2090000000000000000
    4"4"3.76"3.76"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K3090000000000000000
     
    1/8" Thick Wall
    3/4"1 1/2"1/2"1 1/4"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K115000000000000000
    1"1 1/2"3/4"1 1/4"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K125000000000000000
    1 1/4"1 1/4"1"1"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K135000000000000000
    1 1/2"2"1 1/4"1 3/4"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K145000000000000000
    1 3/4"1 3/4"1 1/2"1 1/2"RoundRoundWeldedERW32,000Not RatedNot RatedASTM A513 Type 16527K215000000000000000
    2"4"1 3/4"3 3/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K225000000000000000
    2"5"1 3/4"4 3/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K2350000000000000000
    2"6"1 3/4"5 3/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K2450000000000000000
    2 1/2"2 1/2"2 1/4"2 1/4"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K414000000000000000000000000000000000000
    3"3"2 3/4"2 3/4"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K424000000000000000000000000000000000000
    3"4"2 3/4"3 3/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K3150000000000000000
    3 1/2"3 1/2"3 1/4"3 1/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K4340000000000000000000000000000000000000
    4"4"3 3/4"3 3/4"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K4440000000000000000000000000000000000000
     
    0.188" Thick Wall
    1 1/2"1 1/2"1.124"1.124"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K212000000000000000
    2"2"1.624"1.624"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K514000000000000000000000000000000000000
    2"6"1.624"5.624"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K32500000000000000000
    3"3"2.624"2.624"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K524000000000000000000000000000
    3"6"2.624"5.624"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K33500000000000000000
    4"4"3.624"3.624"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K5340000000000000000000000000000000000
     
    1/4" Thick Wall
    1 1/2"1 1/2"1"1"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K2920000000000000000
    2"2"1 1/2"1 1/2"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K6140000000000000000000000000000000000000
    2"8"1 1/2"7 1/2"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K312000000000000000000
    3"3"2 1/2"2 1/2"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K624000000000000000000000000000000000000000000000
    3 1/2"3 1/2"3"3"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K5030000000000000000
    4"4"3 1/2"3 1/2"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K6340000000000000000000000000000000000000000
    4"8"3 1/2"7 1/2"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K515000000000000000000
    5"5"4 1/2"4 1/2"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K156000000000000000000
    6"6"5 1/2"5 1/2"RoundRoundWeldedERW46,000Not RatedNot RatedASTM A5006527K644000000000000000000000000000000
     
    5/16" Thick Wall
    4"4"3 3/8"3 3/8"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K1570000000000000000
    6"6"5 3/8"5 3/8"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K2560000000000000000
     
    3/8" Thick Wall
    3"3"2 1/4"2 1/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K2570000000000000000
    4"4"3 1/4"3 1/4"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K4160000000000000000
     
    1/2" Thick Wall
    4"4"3"3"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K4170000000000000000
    4"6"3"5"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K466000000000000000000
    4"8"3"7"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K467000000000000000000
    8"8"7"7"RoundRoundWeldedERW39,000Not RatedNot RatedASTM A5006527K526000000000000000000
     

    Multipurpose Low-Carbon Steel Round Tubes

    Image of Product. Front orientation. Steel. Multipurpose Low-Carbon Steel Round Tubes.
    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 frames, supports, and conduit.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    OD
    ID
    Fabrication
    Mechanical
    Tube Type
    Heat
    Treatable
    Yield Strength,
    psi
    Hardness
    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
    0.049" Thick Wall
    1"0.902"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 27767T1510000000000000000000000000000
    1 1/2"1.402"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 27767T171000000000000000000000000
    2"1.902"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 27767T191000000000000000000000000000000
     
    0.065" Thick Wall
    1"0.87"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A5137767T231000000000000000000000000000000
    1 1/2"1.37"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 27767T27100000000000000000000000000000
    2"1.87"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T29100000000000000000000000000000
    3"2.87"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T331000000000000000000000000000000
    4"3.87"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T351000000000000000000000000000000
     
    0.12" Thick Wall
    1"0.76"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T3710000000000000000000000000000000000
    1 1/2"1.26"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T43100000000000000000000000000000000000
    3 1/2"3.26"WeldedERWNo30,000Rockwell B50 (Soft)ASTM A513 Type 17767T471000000000000000000000000000000
    4"3.76"WeldedERWNo30,000Rockwell B50 (Soft)ASTM A513 Type 17767T49100000000000000000000000000000000000000
    4 1/2"4.26"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T16100000000000000000000000000
     
    0.134" Thick Wall
    1 5/8"1.357"WeldedERWNo32,000Rockwell B55 (Soft)ASTM A513 Type 17767T51000000000000000000000000000000
     
    back to top