Precision Stainless Steel Parts

CNC Machining Stainless Steel

It features high hardness and strength, corrosion resistance, and good thermal stability, as well as excellent rigidity and durability, making it suitable for demanding structural components.

8 Common Stainless Steel Grades

Multi-Axis CNC Machining

Drawing-Based Quality Inspection

Surface Finishing Available

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DFM review based on your drawings

Small batch CNC machined stainless steel part — Small batch of stainless steel parts

CNC machined 304 stainless steel nozzle plate — CNC-machined SS nozzle plate

Material Overview

What Is Stainless Steel?

Stainless steel is an iron-based alloy containing chromium and other alloying elements. Chromium forms a passive surface film that protects the underlying metal and provides excellent corrosion resistance.

Based on composition, stainless steels are grouped into austenitic, ferritic, martensitic, and other families, each offering a different balance of strength, formability, hardness, and machinability.

Passive Protection

Cr protective surface film that improves resistance to corrosion.

Balanced Performance

balance of strength,formability, rigidity and durability.

Multiple Material Families

Different structures support different application requirements.

Corrosion Resistance Strength Thermal Stability Durability

Stainless Steel Grades

CNC Machining Stainless Steel Materials

Compare common stainless steel grades by machinability, strength, wear resistance and corrosion performance.

CNC machined 304 stainless steel mounting block

Austenitic stainless steel

Stainless Steel 304

A versatile grade with reliable corrosion resistance, good formability and consistent machining performance.

Best for General precision parts

Key feature Balanced performance

View the 304 machining guide

Passivation

Forms a protective passive layer on the metal surface to improve stainless steel corrosion resistance.

Improved corrosion protection

Polishing

Reduces surface roughness to improve gloss, precision and the appearance of machined parts.

Smoother and brighter surfaces

Brushing

Produces a fine textured finish that improves appearance and helps conceal minor surface defects.

Consistent decorative texture

Sandblasted stainless steel surface finish

Sandblasting

Cleans and textures the surface to create a uniform matte appearance and improve coating adhesion.

Uniform matte surface

5-Axis

Achievable machining tolerance ±0.005 mm

4-Axis

Achievable machining tolerance ±0.01 mm

Weldo five-axis CNC machining equipment — Five-axis CNC machining for complex stainless steel components and multi-surface features.

Maximum workpiece 1500 × 800 × 600 mm

Minimum workpiece 5 × 5 × 0.5 mm

Maximum machining length Up to 3000 mm

Turning diameter Ø3–Ø500 mm

Positioning accuracy ±0.005 mm Repeatability up to ±0.003 mm

Linear dimensional tolerance Up to IT5 ±0.013 mm per 300 mm

Surface quality Mirror finish Ra ≤ 0.2 μm Grinding Ra ≤ 0.4 μm · Milling Ra ≤ 1.6 μm

Geometric tolerances Cylindricity ≤ 0.005 mm Flatness ≤ 0.01 mm/1000 mm · Perpendicularity ≤ 0.008 mm/300 mm

Corrosion Resistant

Resists rust in humid, acidic and alkaline environments.

Strong and Tough

Stable structure with strong resistance to deformation.

Easy to Clean

Suitable for hygienic food and medical applications.

Temperature Stable

Performs reliably across high and low temperatures.

Recyclable

Long service life with reusable and recyclable material.

Typical Applications

Aerospace

Turbine, hydraulic and high-temperature components.

Medical Devices

Implants, biopsy tubes and precision instrument holders.

Automotive

Shafts, gears and fuel-system components.

Food Processing

Easy-clean 304 and 304L valves and fittings.

Marine Engineering

316L ship and offshore components exposed to seawater.

Chemical and Petroleum

Pumps, valves and reactors for corrosive environments.

304L CNC machined stainless steel part — 304L CNC Machined Component

304 stainless steel positioning clamp block — 304 Positioning Clamp Block

304 stainless steel CNC machined pipe fitting — 304 Stainless Steel Pipe Fitting

316L stainless steel CNC flange sleeve — 316L CNC Flange Sleeve

304 stainless steel machined cavity body — 304 Stainless Steel Cavity Body

17-4 PH stainless steel machined lock plate — 17-4 PH Precision Lock Plate

60+

CNC Machines

Multi-axis CNC and EDM equipment support consistent batch production.

DFM

Design Review

Practical recommendations help reduce cost and improve machining efficiency.

0.001 mm

Inspection Capability

CMM and supporting inspection equipment verify critical part dimensions.

1–15 Days

Flexible Delivery

Samples can ship in 1 day, with production typically shipped in 3–15 days.

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Send us your drawings for a machining review and quotation. For additional questions, contact our team .

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Is stainless steel self-healing?

Stainless steel is not truly self-healing. However, its chromium oxide passive film can regenerate when exposed to oxygen after minor surface damage, restoring corrosion protection.

Is 304 or 316 stainless steel better?

It depends on the application. Stainless steel 304 is cost-effective for general indoor and food-processing parts. Grade 316 provides better resistance in humid, coastal, seawater and acidic environments.

What is the best grade of stainless steel?

There is no single best grade. Choose 304 for balanced cost and performance, 316L for stronger corrosion resistance, and 17-4 PH when high strength and heat treatment are required.