Reviewed technical and procurement guidance · 10 August 2026

SAE/AISI 1045 Carbon Steel Bar

Procurement guide for 1045 medium-carbon steel bar covering as-rolled, normalized or heat-treated condition, hardness, machining allowance, inspection and traceability.

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

Bar is hot rolled or forged and may be normalized, quenched and tempered, turned, peeled or ground to order.
Section size and heat-treatment route affect hardness and through-section properties; use an approved process and test location.

Typical applications

Shafts, gears, axles and machine components after engineering review
Pins, rollers and wear-loaded parts with controlled heat treatment
General medium-strength machined components

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

1045 chemistry alone does not guarantee hardness, toughness or through-section properties; condition and section size control.
Welding normally needs more control than low-carbon grades; qualify preheat, consumables and post-weld treatment for the component.

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 1045

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

Independent grade guide →

RFQ support

SAE/AISI 1045 Carbon Steel Bar

Procurement guide for 1045 medium-carbon steel bar covering as-rolled, normalized or heat-treated condition, hardness, machining allowance, inspection and traceability.

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