Materials · CNC machining
Carbon and alloy steel milled and turned to your drawing — 1018, 1045, 12L14, A36, 4140 and 4340 — on 3-, 4- and 5-axis equipment, with in-house heat treatment and corrosion-protective finishing, inspected in-house. ISO 9001 / IATF 16949 / AS9100D certified.
Carbon and alloy steel give you strength, stiffness and value, and they respond well to heat treatment for higher hardness, wear resistance and fatigue life. We mill and turn carbon steel (1018, 1045, A36), free-machining steel (12L14) and alloy steel (4140, 4340) to your drawing, and coordinate heat treatment — through-hardening, tempering, case-hardening and stress relief — in-house. Because steel is not corrosion-resistant on its own, we finish it: black oxide, zinc or nickel plating, phosphate or powder coat. Send a drawing and you get a line-item quote in 48 hours, one prototype or a production batch, with no minimum order.
Grades
| Grade | Type | Why you pick it | Parts |
|---|---|---|---|
| 1018 | Low-carbon (mild) steel | Easy to machine and weld, economical, case-hardens well | General machined parts, brackets, studs, pins |
| 12L14 | Free-machining (leaded) | Best machinability in steel, fast cycles, fine turned finish | Fittings, fasteners, bushings, high-volume turned parts |
| 1045 | Medium-carbon steel | Higher strength, through-hardenable, good wear resistance | Shafts, axles, spacers, gears, machine parts |
| A36 | Structural mild steel | Weldable, economical structural grade | Base plates, frames, brackets, weldments |
| 4140 | Chromoly alloy steel | High strength and toughness, hardenable, excellent fatigue life | Shafts, gears, couplings, tooling, high-load fittings |
| 4340 | Ni-Cr-Mo alloy steel | Very high strength with deep hardenability and toughness | High-load shafts, heavy-duty drivetrain, demanding structural parts |
These are the carbon and alloy steel grades we run most often. We also machine other grades on request.
Capability
As-machined, black oxide, zinc plating (clear or yellow), nickel and electroless nickel, phosphate (Parkerizing), powder coat and paint, plus oil and rust-preventive for shipping. Steel is not stainless, so a protective finish is usually specified.
See the Finish LibraryAutomotive and EV driveline, industrial machinery, tooling, jigs and fixtures, hydraulics, and high-load shafts, gears and structural parts.
Automotive CNCProduction parts
Material and finish are taken from our production records.
Why Fenva
One source for machining, heat treatment and corrosion-protective finishing, so your steel part ships ready to use. No minimum order, prototype to production.
AS9100D, ISO 9001 and IATF 16949, with material certs and heat-treat records on request.
We machine strictly to your drawing and take full responsibility for the result.
Mini-FAQ
Carbon steel (1018, 1045) for general parts and cost; alloy steel (4140, 4340) when you need higher strength, hardness and fatigue resistance.
Yes — through-hardening, tempering, case-hardening and stress relief, coordinated in-house, with a target hardness on request.
Steel is not stainless, so we finish it: black oxide, zinc or nickel plating, phosphate or powder coat, plus rust-preventive oil for shipping.
Prototypes about 10 to 15 business days, production about 15 to 30, quote in 48 hours.
Get started
Upload your drawings for review and our engineering team will quote within 48 hours, no minimum order.
An NDA is available on request.