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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.
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.
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.
| Details | |
|---|---|
| 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″ |
| Properties | |
| 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. |
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.
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
| 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″ |
