Laser Cut 4130 Chromoly Steel

4130 Chromoly steel is a low carbon alloy steel (Chromium and Molybdenum) that excels in structural applications and welding, along with many other high-stress, high-performance projects.

Starting from $29

High Hardness

Laser cut 4130 Chromoly steel, a durable metal for long-lasting projects

If what you’re making needs to withstand extreme pressures and temperatures over time, Chromoly might be the metal for you. The reason for this is in one of its key properties: Creep Strength.

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Perfect for applications where strength is key

When you use this material in high-stress applications, you can be sure that it will stay in place and hold its shape for longer. Hence why it’s often used in bicycle frames, roll cages, and airplane structures all over the world.

If you’re looking at something a little smaller, like a gear or cog. 4130 Chromoly steel’s excellent heat treatability and machinability make it an ideal fit for strong, tiny parts.

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Material Details

.050″ 4130 Chromoly

Advertised Thickness.050″ | 1.27mm
Thickness Tolerance Positive.003
Thickness Tolerance Negative.003
Cutting ProcessFiber Laser
Cut Tolerance.005
Available Operations
Powder CoatingYes
Design Considerations
Min Part Size.25″ x .375″
Max Part Size44″ x 30″
Min Hole Size.020″
Min Bridge Size.025″
Min Hole to Edge Size.020″
Tab and Slot Tolerance


Min Bend Part Size.375″ x 1.5″
Max Bending Flat Part Size44″ x 30″
Max Bend Length44″
Min Flange Length (Before Bend/Flat Pattern)
90° or less (obtuse)
Min Flange Length (After Bend)
90° or less (obtuse)
Die Width.472″
Effective Bend Radius @ 90°.050″
Max Bend Angle130°
Bend Deduction @ 90°.0945″
K Factor.38
Minimum Joggle BL2BL @90 Max Flange.310″
Maximum Joggle @90 Max Flange3.750″
Bend Relief Depth.120
Largest TapM3 x 0.5
Smallest TapM2 X 0.4
Min Tapping Part Size1″ x 1.5″
Max Tapping Part Size36″ x 46″
Tapping Min Hole to Edge.025″
Tapping Min Hole Center to Material EdgeTap hole size/2 + .025″
Min Plating Part Size1″ x 3″
Max Plating Part Size23″ x 23″
Min Powder Coating Part Size1″ x 3″
Max Powder Coating Part Size23″ x 23″
Material CompositionChromium (Cr): 0.8 – 1.1
Manganese (Mn): 0.4 – 0.6
Carbon (C): 0.28 – 0.33
Silicon (Si): 0.15 – 0.35
Molybdenum (Mo): 0.15 – 0.25
Sulfur (S): 0 – 0.040
Phosphorus (P): 0 – 0.035
Density490 lb/ft^3
Heat treatments processAnnealed/spheroidized
Tensile Strength (Ultimate)77-150 ksi
Tensile Strength (Yield)63-140 ksi
Shear Strength49-93 ksi
Shear Modulus11000 ksi
Fatigue Strength47-96 ksi
Brinell Hardness200-300
Elongation at Break13-26%
Elastic Modulus27000 ksi
Poisson’s Ratio.29
Thermal Conductivity25 BTU/h-ft-°F
Melting Point2590 °F
Does it Rust?It can, but Chromoly is corrosion resistant and tends to rust only at the surface level. With appropriate preparation and maintenance, Chromoly will avoid rusting indefinitely.

Not sure what some of those properties mean? Check out our Material Properties Cheat Sheet.

Our laser cut chromoly is guaranteed

We guarantee awesome quality parts. If you’re not 100% happy, we’ll give you a refund or remake on the spot – no questions, no hassle.

Services available for chromoly


We know your projects are multi-dimensional. Get freshly bent metal parts, right off the machine.


Protect your designs with plating. Zinc electroplating helps defend your parts from rust while increasing strength and resistance to wear.

Powder Coating

Custom powder coating gives your laser and waterjet cut parts a bold, long-lasting finish and protective layer which provides corrosion, oxidation, and damage resistance.


Utilizing specialized, automated equipment, we precisely laser-cut a hole, create some threading, and send you on your way with your completed part.

Bending with Chromoly

Stress cracking is common and unavoidable when bending 4130 Chromoly, especially at thicknesses of .125″ and greater.

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We proudly use hardware by PEM

Flush Standoff, 4-40, .250" Zinc plus Clear Chromate

Thread Size4-40 x .250″
Hole size in sheet (+0.003/-.0.000).168″
Minimum sheet thickness0.040″
Maximum sheet thickness.125″
Fastener materialSteel
Minimum distance hole C/L to edge0.230″
When determining the distance between two or more fasteners, you can calculate the distance by the formula, C/L to edge + 1/2 the diameter of the second mounting hole..314″
Recommended panel materialSteel/Aluminum
Coating typeZinc
Aluminum material ranges (5052, 6061, 7075)0.040″-0.125″
Steel material ranges (CRS, HRPO, HR)0.048″-0.119″