What it is
Solid long product in round, square, hexagonal or rectangular section, supplied to finished size and tolerance for machining. Produced by hot rolling or forging followed by straightening, and often centerless ground or turned.
- Typical dimensions
- Roughly 0.125 to 12 inches diameter.
- Also known as
- bars, rod, round bar, flat bar, hex bar, bar stock
Suppliers
Grouped by what they actually are. A mill and a distributor answer different needs.
Mills and producers 4
Companies that manufacture this form. Mill direct means longer lead times and mill minimums, with full melt traceability.
-
Carpenter Technology Corporation Verified
Alloy and specialty steel including tool and die steel, in bar. Tool steel is the material most mould and die work starts from.
source -
Nucor Corporation ReportedUS melted
Domestic EAF melting. No armor specification qualification was confirmed. Re-confirmed 2026-07-30 and corroborated: every Nucor mill melts recycled scrap in an electric arc furnace and continuously casts. DFARS 252.225-7009 status is still settled per heat on the mill certificate.
source -
Steel Dynamics, Inc. VerifiedUS melted
Engineered special-bar-quality (SBQ), merchant-bar-quality (MBQ) and other engineered round bar, plus cold finished bar. SBQ is made to internal cleanliness and hardenability requirements, not just a shape. It is the feedstock for forged and machined rotating parts. Melted in an electric arc furnace with ladle metallurgy refining and continuously cast. Domestic melting, but DFARS 252.225-7009 status is settled per heat on the mill certificate.
source -
Universal Stainless & Alloy Products VerifiedUS melted
Tool steel, bearing steel, gear steel and aircraft quality low alloy steel long products. Tool steel, bearing steel, gear steel and aircraft quality low alloy steel long products. Re-confirmed 2026-07-30 and corroborated by the melt routes established this pass: AOD, ESR and VAR at Bridgeville and VIM plus ESR or VAR at North Jackson. Those are different cleanliness levels, not synonyms. An aerospace specification usually names the one it requires, so ask for the route as well as the origin.
source
Distributors and stockists 6
Companies that hold inventory for resale. Faster and available in small quantities, at a markup. Ask what mill the material came from if traceability matters.
-
Alro Steel Reported
Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.
source -
American Alloy Steel ReportedHY-80 and HY-100
Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.
source -
Olympic Steel Verified
Bar among the stocked long products.
source -
Ryerson Inferred
Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.
source -
Service Steel Aerospace Verified
300M, 4330 Mod, 4340 and 9310 alloy steel bar, plus AerMet 100 and maraging 250, 300 and 350. This is the landing gear and shafting alloy set.
source -
Wieland Diversified ReportedHY-80 and HY-100
HY-80 and HY-100 round stock. Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing. HY-80 and HY-100 round stock.
source