Cadmium Coated Stud Bolts ASTM A193 B7 Manufacturer
What Is Cadmium Coating?
Cadmium plating is a sacrificial, metallic coating applied by electroplating or mechanical means to carbon steel or alloy steel bolts
Benefit of Cadmium Coating
Corrosion resistance (superior in marine & salt spray conditions)
Low friction coefficient (ideal for threaded assemblies)
Anti-galling & lubricity
Good conductivity (used in electrical and aerospace hardware)
Temperature resistance up to ~250°C (482°F)
Stud Bolt material grade Cadmium coating applied
| Base Material | Common Grades |
|---|---|
| Carbon Steel | ASTM A193 B7, B7M |
| Alloy Steel | ASTM A193 B16 |
Stud bolt can be Cadmium plating accoriding to ASTM B766
ASTM B766 Standard Specification for Electrodeposited Coatings of Cadmium
This specification covers the requirements for electrodeposited cadmium coatings on products of iron, steel, and other metals.
Note 1: Cadmium is deposited as a coating principally on iron and steel products. It can also be electrodeposited on aluminum, brass, beryllium copper, copper, nickel, and powder metallurgy parts.
1.2 The coating is provided in various thicknesses up to and including 25 μm either as electrodeposited or with supplementary finishes.
Stud Bolt Cadmium plating Specifications
| Type | Details |
|---|---|
| Coating Thickness | 5 to 25 µm (usually 8–12 µm) |
| Finish Options | Bright, clear, olive drab (with chromate) |
| Color | Silver-gray to dull gold (depends on chromate finish |
Application of Stud Bolt Cadmium plating
Applications of Cadmium-Coated Stud Bolts
Offshore Oil & Gas Platforms
Shipbuilding & Marine Equipment
Military & Defense Equipment
Aerospace Fasteners
Electrical Grounding Systems
Nuclear & Subsea Environments
Cadmium Plating vs. Other Coatings Comparison Sheet
| Coating | Corrosion Resistance | Lubricity | Toxicity | Notes |
| Cadmium | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⚠️ Yes | Excellent for aerospace/marine |
| Zinc Plating | ⭐⭐ | ⭐⭐ | ❌ No | Cheaper, less durable |
| Zinc-Nickel Plating | ⭐⭐⭐ | ⭐⭐ | ❌ No | REACH-compliant alternative |
| PTFE / Xylan | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ❌ No | Great non-stick coating |
