DLC (Diamond-Like Carbon) Coating
DLC coating: 200-500 h salt spray with very low friction and high wear resistance for micro screws and fast-moving parts.
| Finish Code | TZ011 |
|---|---|
| Environmental Grade | Vacuum deposition; no waste-liquid discharge. RoHS compliant |
| Salt Spray Standard | 200-500 h; film system can be tuned on request |
| Appearance / Colour | Dark grey to black |
| Suitable For | Precision micro screws, high-speed moving parts, wear-resistant fasteners |
| Features | Low friction; high wear resistance; corrosion resistant |
| Environmental Compliance | REACH and RoHS compliant |
Overview
Surface finishing on a fastener is a functional coating, not a cosmetic one: it sets the friction coefficient that determines how much of the applied torque becomes clamp load, and it defines how long the part survives in a corrosive environment. Two finishes that look identical can differ by a factor of several in salt-spray hours and by enough in friction to change the torque specification. This listing: finish code TZ011, salt spray 200-500 h, appearance / colour Dark grey to black, environmental compliance REACH and RoHS compliant.
What sets this listing apart: Features Low friction; Salt Spray Standard 200-500 h.
Advantages
Hydrogen embrittlement risk separates processes: electroplating on high-strength steel needs a de-embrittlement bake, while mechanical and flake coatings avoid the risk entirely.
Friction coefficient changes with coating: a zinc-flake coating typically runs lower and more consistently than electroplated zinc, which is why torque tables are finish-specific.
Barrier coatings protect the base metal, while sacrificial coatings protect the steel even at a scratch; the choice depends on whether the joint will be damaged in service.
Applications
Automotive underhood and body joints, outdoor equipment, marine and coastal installations, electronics hardware, and any joint where the torque specification is tied to a friction value.
Quote the standard, the hours and the acceptance criterion together — a salt-spray figure without the test method is not a specification. Check that the coating process is compatible with the core hardness of the part.
Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.
Specifications across this series
6 parts in this series
| Part | Finish Code | Environmental Gr… | Salt Spray Stand… | Appearance / Col… |
|---|---|---|---|---|
| DLC Diamond-Like Carbon Coating · TZ011 / Vacuum deposition; no waste-liquid discharge. RoHS compliant / 200-500 h; film system can be tuned on request | TZ011 | Vacuum deposition; no waste-liquid discharge. RoHS compliant | 200-500 h; film system can be tuned on request | Dark grey to black |
| PVD-TiN Titanium Nitride (Gold PVD) · TZ014 / Vacuum PVD process; pollution-free. RoHS compliant / 48-160 h; depends on substrate quality | TZ014 | Vacuum PVD process; pollution-free. RoHS compliant | 48-160 h; depends on substrate quality | Gold |
| PVD-CrN (PVD) · TZ015 / Vacuum PVD process; clean and pollution-free. RoHS compliant / 80-200 h; improved by suitable pre-treatment | TZ015 | Vacuum PVD process; clean and pollution-free. RoHS compliant | 80-200 h; improved by suitable pre-treatment | Silver-grey |
| PVD-TiAlN Titanium · TZ016 / Vacuum PVD process; clean and pollution-free. RoHS compliant / 80-180 h; closely tied to substrate quality | TZ016 | Vacuum PVD process; clean and pollution-free. RoHS compliant | 80-180 h; closely tied to substrate quality | Violet-grey to bronze |
| PVD- DLC Diamond-Like Carbon Coating · TZ017 / Vacuum PVD deposition; clean and pollution-free. RoHS compliant / 200-500 h; film stack can be customised | TZ017 | Vacuum PVD deposition; clean and pollution-free. RoHS compliant | 200-500 h; film stack can be customised | Dark grey to black |
| PVD Coating (PVD Hard Film) · TZ305 / REACH / RoHS compliant / Not applicable (functional coating) | TZ305 | REACH / RoHS compliant | Not applicable (functional coating) | Silver, gold, black or custom colours |
Values are taken from each part’s own attribute set. Changing length, material or finish changes pull-out strength and installation torque, so compare the row that matches your drawing.
Selection and test data: engagement length, standards, salt-spray hours
FAQ
What does this finish provide?
Finish Code TZ011, Environmental Grade Vacuum deposition, Salt Spray Standard 200-500 h, Appearance / Colour Dark grey to black.
How does it affect torque and friction?
Carbon Steel.
What should I verify before ordering or installing it?
Quote the standard, the hours and the acceptance criterion together — a salt-spray figure without the test method is not a specification. Check that the coating process is compatible with the core hardness of the part.