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.

  • Engine mounts

  • Aerospace structural

  • Gears

  • Automotive

  • Resistance welding projects

  • Bicycle parts

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Material Details

.050″ 4130 Chromoly

Advertised Thickness .050″ | 1.27mm
Gauge N/A
Thickness Tolerance Positive .003
Thickness Tolerance Negative .003
Cutting Process Fiber Laser
Cut Tolerance .005
Available Operations
Deburring No
Bending Yes
Countersinking No
Tapping Yes
Anodizing No
Plating Yes
Powder Coating Yes
Hardware No
Design Considerations
Min Part Size .25″ x .375″
Max Part Size 44″ x 30″
Min Hole Size .020″
Min Bridge Size .025″
Min Hole to Edge Size .020″
Tab and Slot Tolerance .010″
Min Bend Part Size .375″ x 1.5″
Max Bend Part Size 30″ x 30″
Min Flange Length (After Bend) .302″
Die Width .472″
Effective Bend Radius @ 90° .050″
Max Bend Angle 130°
Bend Deduction @ 90° .0945″
K Factor .38
Minimum Joggle BL2BL @90 Max Flange .310″
Maximum Joggle @90 Max Flange 3.750″
Bend Relief Depth .120
Largest Tap M3 x 0.5
Smallest Tap M2 X 0.4
Min Tapping Part Size 1″ x 1.5″
Max Tapping Part Size 36″ x 46″
Tapping Min Hole to Edge .025″
Tapping Min Hole Center to Material Edge Tap hole size/2 + .025″
Min Plating Part Size 1″ x 3″
Max Plating Part Size 23″ x 23″
Min Powder Coating Part Size 1″ x 3″
Max Powder Coating Part Size 23″ x 23″
Material Composition Chromium (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
Density 490 lb/ft^3
Tensile Strength (Ultimate) 77-150 ksi
Tensile Strength (Yield) 63-140 ksi
Shear Strength 49-93 ksi
Shear Modulus 11000 ksi
Fatigue Strength 47-96 ksi
Brinell Hardness 200-300
Elongation at Break 13-26%
Elastic Modulus 27000 ksi
Poisson’s Ratio .29
Thermal Conductivity 25 BTU/h-ft-°F
Melting Point 2590 °F
Magnetic Yes
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.

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

SKU SO-440-8
Thread Size 4-40 x .250″
Hole size in sheet (+0.003/-.0.000) .168″
Minimum sheet thickness 0.040″
Maximum sheet thickness .125″
Fastener material Steel
Minimum distance hole C/L to edge 0.230″
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. .345″
Recommended panel material Steel/Aluminum
Coating type Zinc
Length .250″
Aluminum material ranges (5052, 6061, 7075) 0.040″-0.125″
Steel material ranges (CRS, HRPO, HR) 0.048″-0.119″