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Top rated steel bars
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Best overall MSP MetalsMasteel 1018 Cold Rolled Steel Round Bar, 1" Diameter, 36" Length
High-quality 1018 cold rolled steel with tight tolerances, excellent for general machining and fabrication.
- Good surface finish
- Consistent dimensions
- Versatile alloy
- May have slight surface rust
- Limited length options
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Best for machining Online MetalsSteelMaster 12L14 Free Machining Steel Round Bar, 3/4" Diameter, 36" Length
12L14 free machining steel that produces fine chips and excellent surface finish, ideal for high-speed CNC work.
- Excellent machinability
- Consistent quality
- Great surface finish
- Not for welding
- Slightly higher cost per foot
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Best for strength MSP MetalsMSP 4140 Alloy Steel Round Bar, Annealed, 1.5" Diameter, 24" Length
4140 annealed alloy steel offers high strength and toughness, suitable for shafts, gears, and tooling.
- High strength
- Good wear resistance
- Heat treatable
- Difficult to machine
- Heavier than mild steel
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Best square bar GenericAccuTrex 1018 Cold Rolled Steel Square Bar, 1" x 1" x 36"
Precision ground 1018 square bar with sharp edges and straightness, perfect for jigs and fixtures.
- Sharp 90° corners
- Straightness tolerance
- Good for welding
- Pricey per foot
- Limited sizes
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Best for shafts Generic
M-Kube 1045 Carbon Steel Round Bar, 2" Diameter, 12" Length
Medium carbon 1045 steel with good strength and wear resistance, often used for axles and shafts.
- Good strength
- Weldable
- Heat treatable
- Tough to machine
- May warp during heat treat
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Best hex bar MSP MetalsVictor Machinery 12L14 Hexagon Bar, 7/8" Across Flats, 12" Length
Free machining 12L14 hexagonal bar for lathe work, bolts, and fittings; excellent for beginners.
- Easy to cut
- Good for threading
- Hex shape holds well
- Short length
- Not structural grade
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Best tool steel GisafaiBohler-Uddeholm O1 Tool Steel Round Bar, 1" Diameter, 18" Length
O1 oil-hardening tool steel with excellent dimensional stability, ideal for punches, dies, and knives.
- High hardness
- Stable during heat treat
- Good wear resistance
- Expensive
- Requires heat treatment
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Best budget pick GenericSteelSupply A36 Hot Rolled Steel Flat Bar, 1/4" x 2" x 48"
Economical A36 hot rolled flat bar for general structural applications, supports and bracing.
- Low cost
- Easy to weld
- Easy to cut with saw
- Rough surface
- Variable dimensions