Stainless Steel CNC Machining: Precision 304/316 Parts Guide

What is Stainless Steel CNC Machining?

Stainless steel combines strength with excellent corrosion resistance, making it the standard for food, medical, marine, chemical and outdoor equipment. We CNC machine austenitic grades 304, 304L, 316 and 316L, plus free-machining 303 and 316F.

304 vs 316

304 is the versatile general-purpose grade for indoor and general environments. 316 adds molybdenum for superior chloride and marine corrosion resistance. Low-carbon L grades suit welded parts.

Machining and tooling

Stainless work-hardens and generates heat, so we use rigid setups, sharp tooling and controlled feeds to maintain tolerances and avoid work-hardening or built-up edge.

Hygienic and polished finishes

We supply brushed, mirror-polished and passivated surfaces suitable for food, medical and cleanroom use, removing free iron and improving corrosion performance.

Featured Stainless Steel CNC Machining parts

Every part below is manufactured in-house and available made-to-print. Click through to view materials, specifications and finish options.

CNC Milled 304 Stainless Steel Fixture BlockCNC Milled 316 Stainless Steel Valve BodyCNC Milled 303 Stainless Steel FlangeCNC Milled 316L Stainless Steel BushingCNC Milled 316F Stainless Steel Pump BodyCNC Milled 304 Stainless Steel BracketCNC Milled 316 Stainless Steel ManifoldCNC Milled 303 Stainless Steel Shaft CouplingCNC Milled 316L Stainless Steel HousingCNC Milled 316F Stainless Steel HeaderCNC Milled 304 Stainless Steel Mounting PlateCNC Milled 316 Stainless Steel Bearing Block

Typical applications

Medical and surgical instruments, food and pharmaceutical equipment, marine and chemical components, pumps and valves, fittings and fasteners, and hygienic structural parts.

Frequently asked questions

Should I use 304 or 316 stainless?

Choose 304 for general use and 316 where exposure to salt, chemicals or chlorides demands greater corrosion resistance. We can help select the grade.

Do you provide passivation?

Yes — passivation removes embedded iron and restores the natural corrosion-resistant surface, with finish and cleanliness verified.

What tolerances are possible?

We routinely hold ±0.01 mm on critical features, with ISO 2768-mK as the default and CMM inspection available.

Can stainless parts be polished?

Yes — from brushed to mirror finishes suited to hygienic and cosmetic applications.

Request a quote

YOUSU Precision is an ISO 9001 certified manufacturer in Shenzhen. Send your STEP, STP, IGS, DWG or PDF with quantity and finish requirements, and our engineering team responds within 24 hours with DFM feedback, price and lead time — supporting prototype, small-batch and repeat volume production with full inspection documentation.