What is custom stainless steel machining?

We produce stainless steel parts to your specific design—your dimensions, tolerances, material, and finish. Every job is unique and built to your requirements.

What stainless grades can you machine for custom orders?

303, 304, 316, 316L, 17-4PH, 410, 420, and 440C. We also machine specialty grades upon request.

What is the most machinable stainless steel grade?

303 stainless steel offers the best machinability with added sulfur for chip breakage. Use 303 for custom parts that will not be welded.

Can you machine custom parts from existing samples?

Yes, we reverse-engineer physical samples when drawings are unavailable.

What is passivation and when is it needed?

Passivation is a chemical treatment that removes free iron and restores the protective chromium oxide layer. It is standard for all stainless parts, especially medical, food, and marine applications.

What is the difference between 304 and 316 stainless?

304 is the most versatile with good corrosion resistance and excellent weldability. 316 adds molybdenum for superior chloride resistance—marine, chemical, and saltwater environments.

Is there a minimum order quantity?

No. We machine single prototypes and high-volume production runs with the same quality standards.

Custom Stainless

Custom stainless steel CNC machining is the precision processing of stainless steel alloys manufactured to customer-defined specifications. Stainless steel is defined by its chromium content—minimum 10.5%—which forms a passive oxide layer providing exceptional corrosion resistance without coatings. The material is available in multiple families: austenitic grades, martensitic grades, and precipitation-hardening grades.

Custom stainless steel machining presents unique challenges: work hardening during cutting, gummy chip formation, and high cutting forces. We use specialized carbide tooling and high-pressure coolant to manage these challenges. Tolerances are held to ±0.02–0.05mm standard, with precision work at ±0.01mm. Every custom order is unique—your design, your tolerances, your material, your finish.

Our CNC Machining Services

From prototype to production — reliable quality, on-time delivery

We provide precision CNC machining services for a wide range of materials including aluminum, steel, stainless steel, copper, brass, titanium, PEEK, PTFE, acetal, nylon, and other engineering plastics. Our manufacturing capabilities cover 3-axis, 4-axis, and 5-axis CNC milling, as well as CNC turning, suitable for both prototype development and high-volume production runs.

With ISO 9001:2015 certification and a commitment to quality, we serve customers across aerospace, automotive, medical, electronics, industrial equipment, and consumer goods industries. Our in-house capabilities include surface finishing, anodizing, powder coating, heat treatment, and inspection with CMM and optical measurement equipment.

We offer competitive pricing, flexible lead times, and full material traceability. From simple brackets to complex precision components, we deliver parts that meet your specifications with reliable quality and on-time delivery.

Case StudiesMore+

SLINAR - Precision 304 Stainless Steel Liquid Cooling Adapter: Milling + Turning Solution with Passivation Treatment

Precision 304 Stainless Steel Liquid Cooling Adapter: Milling + Turning Solution with Passivation Treatment-stainless_steel

SLINAR - Precision D2 Tool Steel Fixture Fastening Component: High-Accuracy Milling with Superior Flatness for 3C Assembly Tooling

Precision D2 Tool Steel Fixture Fastening Component: High-Accuracy Milling with Superior Flatness for 3C Assembly Tooling-stainless_steel

SLINAR - Medical-Grade Stainless Steel Shafts | CNC Turned 316L for Surgical Robotics

Medical-Grade Stainless Steel Shafts | CNC Turned 316L for Surgical Robotics-stainless_steel

SLINAR - Precision 316 Stainless Steel Medical Fluid Component with Passivation for Bio-Contact Applications

Precision 316 Stainless Steel Medical Fluid Component with Passivation for Bio-Contact Applications-stainless_steel

SLINAR - Precision 304 Stainless Steel Knurled Micro-Adjustment Handle Shaft with Passivation and TIR Control for Medical Equipment

Precision 304 Stainless Steel Knurled Micro-Adjustment Handle Shaft with Passivation and TIR Control for Medical Equipment-stainless_steel

SLINAR - Precision 304 Stainless Steel Test Fixture Block: High-Stability Milling for Semiconductor Test Equipment

Precision 304 Stainless Steel Test Fixture Block: High-Stability Milling for Semiconductor Test Equipment-stainless_steel

Materials

Aluminum 5083-H111

Aluminum 5083-H111 | 3.3547 | 54300| AlMg4.5Mn0.7

Aluminum 5083 (CNC) is a strain hardening aluminum alloy with excellent corrosion resistance. Suitable for marine applications. Can be welded.

Understand Aluminum 5083-H111

Aluminum 6063

Aluminum 6063 | EN AW-6063 | 62400| AlMg0,7Si

Aluminum 6063 has good mechanical properties and can be heat treated. Suitable for aerospace applications. Can be welded.

Understand Aluminum 6063

Aluminum 5052

Aluminum 5052 | EN AW-5052 | 3.3523 | AlMg2,5

Aluminum 5052 is a strain hardening aluminum alloy with excellent corrosion resistance. Suitable for marine applications. Can be welded.

Understand Aluminum 5052

Aluminum 2024-T351

Aluminum 2024-T351 | 3.1355 | 24530 | AlCu4Mg1

Aluminum 2024 is a high-strength alloy with excellent fatigue resistance. Suitable for aerospace applications.

Understand Aluminum 2024-T351

Aluminum 7050

Aluminum 7050 | EN AW-7050 | 3.4144| AlZn6CuMgZr

Aluminum 7050 has excellent mechanical properties with good ductility, high strength, toughness and good resistance to fatigue. Suitable for aerospace applications.

Understand Aluminum 7050

Aluminum MIC-6

Aluminum MIC6

Aluminum MIC6 is a light weight material that can be easily machined at high speed and is free from tension, contaminants and porosity.

Understand Aluminum MIC-6

Aluminum 6082-T651

Aluminum 6082-T651 | 3.2315 | 64430 | AlSi1MgMn

Aluminum 6082-T651 (CNC) has very similar composition and properties to 6061, with slightly higher tensile strength. Compliant with British Standards.

Understand Aluminum 6082-T651

Aluminum 2017A

Aluminum 2017A | 3.1325 | 24530 | AlCu4MgSi

Aluminum 2017 has a higher ductility and formability than Aluminum 2014 and has intermediate strength.

Understand Aluminum 2017A

Aluminum 7075-T651

Aluminum 7075-T651 | 3.4365 | 76528 | AlZn5.5MgCu

Aluminum 7075-T651(CNC) is an aerospace-grade material with excellent strength-to-weight ratio and strength and hardness comparable to steels. T651 is the temper of Aluminum 7075, and to achieve this temper, the alloy is solution heat-treated, stress relieved, and then artificially aged.

Understand Aluminum 7075-T651

Aluminum 2014

Aluminum 2014 | 3.1255 | 24345 | AlCu4SiMg

Aluminum 2014 is easily machined and can be hardened to get strengths comparable to steel, but is prone to corrosion. Suitable for aerospace applications.

Understand Aluminum 2014

Aluminum 6061-T651

Aluminum 6061-T651 | 3.3211 | 65028 | AlMg1SiCu

Aluminum 6061-T651 is commonly used in aerospace, automotive and construction industry, as it is valued for its high strength, excellent machinability, and good weldability. The "T651" designation indicates that the material has been heat-treated to a specific level of hardness.

Understand Aluminum 6061-T651

Aluminum 7075-T7351

Aluminum 7075-T7351 | 3.4365 | 76528 | AlZn5.5MgCu

Aluminum 7075-T7351 is commonly used in aerospace and defense applications, as well as automotive and transportation, as it is valued for its high strength, excellent machinability and good fatigue resistance. The "T7351" designation indicates that the material has been heat-treated to a specific level of hardness.

Understand Aluminum 7075-T7351

Aluminum 6061-T6

Aluminum 6061-T6 | 3.3211| 65028| AlMg1SiCu

Aluminum 6061 (CNC) is the most popular aluminum alloy. It has good strength-to-weight ratio, excellent machinability and natural corrosion resistance.

Understand Aluminum 6061-T6

Aluminum 6082

Aluminum 6082 | 3.2315 | 64430| AlSi1MgMn

Aluminum 6082 (CNC) has very similar composition and properties to 6061, with slightly higher tensile strength. Compliant with British Standards.

Understand Aluminum 6082

Aluminum 6060

Aluminum 6060 | 3.3206 | AlMgSi

Alloy 6060 offers good strength, relatively good corrosion resistance and is suitable for decorative anodizing.

Understand Aluminum 6060

Aluminum 7075-T6

Aluminum 7075-T6 | 3.4365 | 76528 | AlZn5,5MgCu

Aluminum 7075-T6 (CNC) is an aerospace-grade material with excellent strength-to-weight ratio and strength and hardness comparable to steels.

Understand Aluminum 7075-T6

Applications

Custom Medical Devices

Custom surgical instruments and tool bodies
Orthopedic implant components to your design
Dental instruments and tooling
Medical device housings and enclosures
Sterilization trays and containers

Custom Food & Beverage

Food processing equipment components
Dairy and brewery system parts
Conveyor system parts to your design
Commercial kitchen equipment
Food-grade fittings and tubing

Custom Marine & Chemical

Marine hardware and boat fittings
Chemical processing equipment components
Pump housings and impellers
Valve bodies and actuator components
Heat exchangers and condenser parts

Custom Aerospace & Defense

High-strength structural components
Corrosion-resistant fasteners
Sensor housings and enclosures

Custom Industrial Equipment

Shafts, bushings, and bearings
Hydraulic and pneumatic components
Wear-resistant guide rails and slides

Capabilities

We specialize in custom CNC machining of stainless steel parts manufactured to your exact specifications. Every order is unique—your design, your tolerances, your material, your finish. No minimum order quantity. We machine 303, 304, 316, 17-4PH, 410, 420, and 440C grades. Equipment includes 3/4/5-axis CNC milling and CNC turning with live tooling. Tolerances held to ±0.02-0.05mm standard, ±0.01mm precision. Surface finishes include as-machined, passivation, electropolishing, and mechanical finishing. ISO 9001:2015 and AS9100D certified.

Finishes

Passivation

Chemical treatment to remove free iron and restore corrosion resistance
Standard finish for most stainless parts

Electropolishing

Electrochemical removal of surface material
Improves finish and corrosion resistance
Achieves Ra 0.4μm or better

Mechanical Finishes

Bead Blasting: Uniform matte texture
Brushing: Directional grain pattern
Polishing: High-gloss reflective finish
Tumbling: Edge deburring

Plating & Coating

Electroless Nickel: Additional wear and corrosion protection
PTFE / Teflon: Low-friction non-stick surface
Powder Coating: Durable decorative finish

Technical Specs

Stainless Grade	Type	Machinability	Corrosion Resistance	Key Properties	Common Uses
303	Austenitic	78%	Good	Added sulfur for chip breakage	Fittings, shafts, valve parts, screws
304	Austenitic	45%	Very Good	Most versatile, good weldability	Enclosures, brackets, food equipment
316	Austenitic	36%	Excellent	Molybdenum for chloride resistance	Marine, chemical, surgical instruments
316L	Austenitic	36%	Excellent	Low carbon for better weldability	Pharmaceutical, implant devices
17-4PH	Precipitation	50%	Good	High strength, heat-treatable	Aerospace, defense, high-strength parts
410	Martensitic	Good	Moderate	High strength, magnetic	Valves, pump parts, wear-resistant

Parameter	303	304	316	17-4PH
Tensile Strength (ksi)	90	73	80	160+
Yield Strength (ksi)	40	31	30	145+
Hardness (Brinell)	160	170	160	350+
Density (g/cm³)	7.90	7.90	7.90	7.80
Corrosion Resistance	Good	Very Good	Excellent	Good

Parameter	Capability
Max Part Size (Milling)	2,000mm x 800mm x 600mm
Max Part Size (Turning)	600mm diameter x 1,500mm length
Standard Tolerance	±0.02 – 0.05mm
Precision Tolerance	±0.01mm
Surface Finish (As-Machined)	Ra 1.6 – 3.2μm
Surface Finish (Electropolished)	Ra 0.4μm

FAQs

What is custom stainless steel machining?

We produce stainless steel parts to your specific design—your dimensions, tolerances, material, and finish. Every job is unique and built to your requirements.
What stainless grades can you machine for custom orders?

303, 304, 316, 316L, 17-4PH, 410, 420, and 440C. We also machine specialty grades upon request.
What is the most machinable stainless steel grade?

303 stainless steel offers the best machinability with added sulfur for chip breakage. Use 303 for custom parts that will not be welded.
Can you machine custom parts from existing samples?

Yes, we reverse-engineer physical samples when drawings are unavailable.
What is passivation and when is it needed?

Passivation is a chemical treatment that removes free iron and restores the protective chromium oxide layer. It is standard for all stainless parts, especially medical, food, and marine applications.
What is the difference between 304 and 316 stainless?

304 is the most versatile with good corrosion resistance and excellent weldability. 316 adds molybdenum for superior chloride resistance—marine, chemical, and saltwater environments.
Is there a minimum order quantity?

No. We machine single prototypes and high-volume production runs with the same quality standards.