Coated Fasteners Manufacturer, Supplier & Exporter in India
Adloy Fasteners is a manufacturer and global exporter of coated fasteners from Mumbai, India. We supply bolts, nuts, screws, washers, studs, threaded rods and anchor bolts with PTFE, hot-dip galvanized, zinc plated (clear, yellow, blue and black), zinc cobalt, aluminium zinc flake, black phosphate, nickel, chrome, cadmium, copper, silver and tin coatings. Coatings protect against corrosion, reduce friction and wear, improve appearance and extend service life. We coat to ISO, ASTM and DIN standards or to your own specification, on carbon steel, alloy steel, stainless steel and non-ferrous bases. Reliable quality, competitive pricing and on-time export delivery make us a trusted partner for buyers worldwide.
Types of Coated Fasteners We Supply
PTFE Coated Fasteners
Low-friction PTFE (Xylan type) coating with strong chemical and corrosion resistance, widely used on flange bolting.
Hot Dipped Galvanized Fasteners
Thick zinc layer applied by dipping in molten zinc for long-life outdoor protection.
Yellow Zinc Plated Fasteners
Electroplated zinc with yellow chromate passivate for better corrosion resistance than clear finishes.
Blue Zinc Plated Fasteners
Bright electroplated zinc with a clear or blue passivate and a clean appearance.
Black Zinc Plated Fasteners
Zinc plating with black passivate for a dark, non-reflective finish with corrosion protection.
Zinc Cobalt Plated Fasteners
Zinc-cobalt alloy plating with better corrosion and heat resistance than standard zinc.
Aluminum Zinc Flake Coated Fasteners
Non-electrolytic aluminium and zinc flake coating (Geomet / Dacromet type) with very high corrosion resistance.
Black Phosphate Fasteners
Phosphate conversion coating, normally oiled, giving a dark finish and a base for paint.
Zinc Plated Fasteners
Economical electroplated zinc for general corrosion protection in dry or mild conditions.
Nickel Plated Fasteners
Hard, bright nickel plating for wear resistance, appearance and corrosion protection.
Chrome Plated Fasteners
Hard chromium plating for a mirror finish, wear resistance and corrosion protection.
Cadmium Plated Fasteners
Cadmium plating for corrosion resistance and lubricity. Restricted in many regions, supplied only where specified.
Copper Plated Fasteners
Copper plating for electrical conductivity and as an undercoat for other platings.
Silver Plated Fasteners
Silver plating for top electrical conductivity and anti-galling performance at high temperature.
Tin Plated Fasteners
Tin plating for solderability, corrosion resistance and a non-toxic finish.
Coating Comparison
| Coating | Typical Thickness | Key Benefit | Typical Use |
|---|---|---|---|
| PTFE Coated | 15 to 30 µm | Low friction, corrosion and chemical resistance | Oil and gas, chemical, offshore |
| Hot Dipped Galvanized | 45 to 85 µm | Heavy, long-lasting outdoor protection | Structural steel, towers, infrastructure |
| Yellow Zinc Plated | 5 to 25 µm | Good protection, recognisable gold finish | Automotive, machinery, general industry |
| Blue Zinc Plated | 5 to 15 µm | Bright finish, moderate protection | Indoor assembly, electrical, furniture |
| Black Zinc Plated | 5 to 15 µm | Black appearance with corrosion protection | Automotive, electronics, equipment |
| Zinc Cobalt Plated | 5 to 15 µm | Improved corrosion and heat resistance | Automotive, engines, brake parts |
| Aluminum Zinc Flake Coated | 8 to 15 µm | High corrosion resistance, no hydrogen embrittlement | High-strength automotive and heavy industry |
| Black Phosphate | 1 to 10 µm | Mild protection, paint base, low reflection | Automotive, drywall screws, machinery |
| Zinc Plated | 5 to 25 µm | Low cost, general protection | General engineering, construction |
| Nickel Plated | 5 to 25 µm | Hardness, appearance, corrosion resistance | Marine, electrical, decorative |
| Chrome Plated | 0.25 to 25 µm (decorative to hard) | Hardness, smoothness, decorative finish | Appliances, automotive trim, equipment |
| Cadmium Plated | 5 to 25 µm | Corrosion resistance in marine conditions, lubricity | Aerospace and defence where specified |
| Copper Plated | 5 to 25 µm | Electrical and thermal conductivity | Electrical, welding, undercoat |
| Silver Plated | 5 to 25 µm | Conductivity, anti-galling, heat resistance | Electrical, aerospace, high temperature |
| Tin Plated | 5 to 15 µm | Solderability, non-toxic, corrosion resistance | Electrical, electronics, food equipment |
Thickness values are typical and vary by standard, size and specification. Please confirm requirements when requesting a quote.
Fasteners We Coat
Base Materials and Suitable Coatings
| Base Material | Coatings |
|---|---|
| Carbon Steel | All coatings; the most common base for plating and galvanizing |
| Alloy Steel | PTFE, zinc flake, phosphate, zinc cobalt; baking after plating for high strength |
| Stainless Steel | PTFE, silver, nickel and other coatings on request |
| Copper Alloys | Nickel, tin, chrome and silver plating |
| Nickel Alloys | PTFE and silver on request |
| Super Alloys | Silver and PTFE on request |
| Non Ferrous Metal & Alloys | Anodising, nickel and other coatings on request |
Coated Fasteners Specifications
| Product | Coated bolts, nuts, screws, washers, studs, threaded rods, anchor bolts and custom fasteners |
|---|---|
| Coatings | PTFE, Hot-Dip Galvanized, Zinc (Clear, Yellow, Blue, Black), Zinc Cobalt, Aluminium Zinc Flake, Black Phosphate, Nickel, Chrome, Cadmium, Copper, Silver, Tin |
| Coating Standards | ISO 4042, ASTM B633, ASTM A153, ISO 10684, ISO 10683, ASTM F1136, ASTM F1137, ASTM B766, ASTM B545 |
| Fastener Standards | ASME B18, ASTM, DIN, ISO, BS, IS |
| Thread | Metric, UNC, UNF, BSW, BSF; oversize or re-tapped nuts for galvanized threads |
| Certificates | Coating thickness reports and EN 10204 3.1 on request |
Applications of Coated Fasteners
- Oil, gas, refinery and offshore flange bolting (PTFE)
- Construction, towers and infrastructure (hot-dip galvanized)
- Automotive and heavy vehicles (zinc flake, zinc cobalt)
- Electrical and electronics (tin, silver, copper)
- Marine and chemical plants
- Machinery and general engineering
- Aerospace and defence (cadmium and silver where specified)
Why Choose Adloy Fasteners?
- Manufacturer with full custom fastener and coating capability
- Fifteen coating types under one roof
- Coating thickness reports and test certificates on request
- Export-grade packing and timely worldwide shipping
- Competitive pricing for bulk and repeat orders