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Materials &
Surface Finishing

From 304/316 Stainless to Ti-6Al-4V Titanium to Engineering Plastics like PEEK — with full surface finishing co-ordination under a single purchase order.

Material Grades Surface Finishing

Material Grades

Sze Loi maintains a wide range of bar stock in over 20 material grades and sizes to minimize your lead times. Our machinists optimize tooling, cutting parameters, and fluids for each alloy—ensuring consistent precision, stability, and surface finish across every production run.

Steels

Stainless · Carbon · Tool

Stainless Steel

303 304 316/L 416 420 430

Plain Carbon & Free-Cutting

1215 12L14 1018

Tool Steel

D2 H13 O1

Stainless 303 and 12L14 offer the best Swiss turning machinability. 316 and 316L are the preferred choice for medical and marine applications.

Non-Ferrous

Aluminium · Brass · Copper

Aluminium

2011 2024 6061 7075

Brass

CW614N (CZ121) C36000 CW508L

Copper

C101 ETP C110 Tellurium Copper

Aluminium 6061 is our highest-volume Swiss turning alloy. Brass C36000 and tellurium copper deliver excellent chip control at high spindle speeds.

Specialty Material

Titanium · Nickel-base · Tungsten

Titanium

Grade 2 (CP) Grade 5 (Ti-6Al-4V)

Refractory & Other

Tungsten Molybdenum

Titanium and Inconel require dedicated tooling, reduced speeds, and high-pressure coolant. Please discuss your application with our engineers before quoting.

Polymers

Engineering Plastics

Confirm current capability — please enquire before specifying polymer materials, as available grades depend on current tooling and bar stock supply.

Engineering Plastics

Delrin (POM) PTFE PEEK Nylon (PA6, PA66) Acetal

PEEK and PTFE are commonly specified for medical, chemical, and semiconductor applications where metal contamination risk is a concern.

Surface Finishing

Sze Loi co-ordinates the full surface finishing process through our approved vendor network in Guangdong and Hong Kong. All finishing work is supplied under a single purchase order with full dimensional inspection before and after treatment.

Process types:  Electroplating Electrochemical Chemical Applied Coating

Finish Process Process Type Typical Use
Bright / Black / Yellow Zinc Rack & barrel electroplating Electroplating Carbon steel corrosion protection
Electroless Nickel (EN) Chemical deposition Chemical Uniform coating on complex geometry; moderate corrosion resistance
Teflon Electroless Nickel (PTFE-EN) Chemical co-deposition Chemical Low friction + corrosion resistance; non-stick surface
Black Oxide Chemical conversion Chemical Mild corrosion resistance; improved appearance; minimal dimensional change
Hard Chrome Electroplating Electroplating Wear resistance, hardness build-up, tight-tolerance restoration
Decorative Nickel + Chrome Electroplating Electroplating Aesthetic finish on consumer and industrial hardware
Anodizing — Type II (Sulphuric) Electrochemical Electrochemical Aluminium aesthetics, corrosion resistance; dyeable
Hard Coat Anodizing — Type III Electrochemical Electrochemical Aluminium wear resistance; aerospace and defence grade
Electropolishing Electrochemical Electrochemical Stainless steel — mirror finish, improved cleanability, deburring
Passivation Chemical Chemical Stainless steel corrosion resistance; removes free iron from surface
Gold / Silver Plating Electroplating Electroplating Electronics connectors; low contact resistance; corrosion protection
Tin Plating (Bright & Matte) Electroplating Electroplating Solderability; PCB connector pins and terminal hardware
Dry Film Lubricant Applied coating (spray / dip) Applied Coating Low friction, anti-seize; aerospace fasteners and slide mechanisms
Copper Plating Electroplating Electroplating Undercoat for multi-layer platings; EMI/RF shielding housings

Don't see the finish you need? Contact us — our vendor network covers most industrial and decorative finishing processes. All finishes subject to suitability review per base material.

Start Your Project

Not sure your material is machinable?

Share your drawing and material specification. Our engineers will advise on machinability, recommended alloy alternatives, and finishing compatibility — then deliver a detailed quotation within 24 hours.

Submit Your RFQ View machining capabilities →

STEP · IGS · DWG · PDF drawings accepted · Response within 1 business day

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