Stainless Steel for CNC Machining

When to Use Stainless Steel

Stainless steels are used when strength and corrosion resistance matter. They are common in medical, industrial, food-contact, marine, and outdoor applications. Stainless can be machined to tight tolerances, but it typically requires more careful tool selection and chip control than aluminum.

Common Uses

Shafts, bushings, and wear components
Fasteners and threaded parts
Housings and brackets for harsh environments
Medical and lab equipment components

Pros

Excellent corrosion resistance
High strength and toughness
Good temperature performance
Passivation/electropolish options for cleanliness

Cons

Slower machining vs aluminum
Work hardening can increase tool wear
Higher material cost

Common Stainless Options

303

304

316

303 is often chosen for machinability. 304 is a widely used general stainless. 316 is preferred for improved corrosion resistance in harsher environments.

Machining Tips

Use stable setups and avoid rubbing to reduce work hardening
Plan tool access for deep pockets and thin walls
Define surface finish and cosmetic zones early
Consider passivation when corrosion resistance is critical

Recommended Finishes

Passivation and electropolish are common choices depending on corrosion and cleanliness requirements.

Explore Finishes

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Stainless Steel