Reviewed technical and procurement guidance · 10 August 2026

SAE/AISI 1018 Carbon Steel Bar

Procurement guide for 1018 carbon steel round, square, hex and flat bar covering finish, tolerance, machining, cold-work condition, testing and surface acceptance.

03Grade-product

Specifications and dimensions

State round, square, hex or flat bar dimensions, length, size tolerance and straightness class.
Order hot-rolled, cold-drawn, turned, peeled or ground finish with decarburization and surface-defect limits.
Define heat-treatment condition, hardness range, machining allowance, end preparation and bundle mass where needed.

Standards and supply condition

SAE J403 chemistry designation for SAE carbon steels
ASTM A29/A29M general requirements for hot-wrought carbon and alloy steel bars

Manufacturing and processing

Billet is hot rolled and may be cold drawn, turned, peeled or ground to the ordered dimensional and surface condition.
Cold work can raise strength and residual stress while changing machinability and straightness; identify the supplied condition.

Typical applications

Machined pins, shafts, spacers and fasteners
Fixtures, brackets and general machine components
Cold-finished parts where the ordered tolerance and surface are suitable

Quality and acceptance controls

Verify SAE/AISI chemistry designation, heat identity and ordered product requirements against the certificate.
Test mechanical properties or hardness in the ordered condition and section size where required.
Measure size, ovality, straightness and length; inspect seams, laps, cracks, scale and decarburization.
Use ultrasonic, magnetic-particle or surface inspection when component criticality and the purchase specification require it.

Include in your RFQ

Exact grade or alloy designation and governing product-standard edition
Product form, manufacturing route and ordered delivery condition or temper
Nominal dimensions, tolerances, length/coil geometry and quantity
Surface finish, edge/end condition, straightness/flatness and permitted defects
Fabrication, forming, machining, welding and heat-treatment requirements
Mechanical, corrosion, coating or application-specific acceptance tests
Inspection document, heat/lot traceability, marking and third-party inspection
Packing, preservation, destination, Incoterms and required delivery date

Selection limits

1018 is a chemistry designation; strength depends on product size, processing and condition.
Do not substitute 1020 or another low-carbon grade without chemistry, properties, weldability and machining review.

10 August 2026

Sources and technical review

ASTM A29/A29M - General Requirements for Hot-Wrought Carbon and Alloy Steel Bars

ASTM International · A29/A29M-23

SAE J403 - Chemical Compositions of SAE Carbon Steels

SAE International · J403_202402

Independent grade guide

SAE/AISI 1018

Review chemistry, properties, corrosion behavior, and material-selection context for this grade.

Independent grade guide →

RFQ support

SAE/AISI 1018 Carbon Steel Bar

Procurement guide for 1018 carbon steel round, square, hex and flat bar covering finish, tolerance, machining, cold-work condition, testing and surface acceptance.

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