1018 steel cnc material

At a Glance


Lead Time

Finish Options




3 days (rush)
5-7 days (standard)
Depending on the alloy, hand polishing and sanding, bead blasting, and powder coating are options.
ISO 2768
fixtures and mounting plates; draft shafts, axles, torsion bars

About the Material

1018 Steel is a mild, low carbon steel that is machinable, weldable and useful where high-strength is not required, such as fixtures and mounting plates. It is magnetic and heat treatable.

4140 alloy steel is generally harder and stronger than carbon steel. Additionally, it provides high impact resistance, fatigue strength, and torsional strength, which makes 4140 a great choice for drive shafts, axles, and torsion bars. In terms of hardening, 4140 can be hardened using a variety of methods such as cold working, or heating and quenching.

Material Properties

1018 Low Carbon Steel

Yield Strength (tensile)

Elongation at Break



60,000 psi
Rockwell B90
7.87 g/㎤
0.284 lbs / cu. in.

4140 Steel

Yield Strength (tensile)

Elongation at Break



60,000 psi
Rockwell C15
7.87 g/㎤
0.284 lbs / cu. in.

Material Finish

Design Recommendations

Min Wall Thickness

Min End Mill Size

Min Drill Size

Max Part Size


Radii : Depth

0.5 mm
0.8 mm
(0.03 in)
0.5 mm
(0.02 in)
1200 x 500 x 152 mm [x,y,z] (mill) 

152 x 394 mm 
[d,h] (lathe)
Square profile, full radius, dovetail profiles
Depth must not exceed 12x drill bit diameter.
For end mills, depth must not exceed 10x tool diameter.

Cost Saving Tip

To reduce costs, limit the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii.

Related Resources

Engineer's Guide to CNC Machining for Prototyping Hardware
Fictiv CNC Material Datasheet