Factory Released Upgraded A4 Stainless Fastener Series For Russian Coastal & Offshore Facilities
Our manufacturer officially launched the upgraded grade A4 stainless steel fastener product line, specially engineered for Russian port terminals, offshore platforms and coastal industrial parks. Different from conventional A4 hardware, this new series features integrated permanent ceramic anti-seize thread coating, eliminating thread galling during assembly and disassembly even after years of continuous salt mist and high humidity exposure.
Key Upgrades Of The New Marine A4 Series
- Higher molybdenum alloy content to strengthen resistance against pitting salt corrosion
- Three-stage surface passivation process after precision thread tapping
- Dry ceramic anti-seize layer bonded directly onto thread teeth, no extra lubricant required on site
- Full size range M4 to M60, including flange bolts and marine anchor fasteners for coastal steel structures
Conventional A4 VS New Marine Grade A4 Performance Comparison
| Performance Index | Standard A4 Stainless Fastener | New Marine A4 Series |
| Neutral Salt Spray Test Hours | 1000 hours | 2000 hours |
| Thread Galling Risk | Medium, copper anti-seize paste mandatory | Minimal, no auxiliary lubricant needed |
| Allowable Air Salt Concentration | Up to 3 g/m³ | Up to 8 g/m³ for severe coastal zones |
| Guaranteed Maintenance-Free Service Life | 3–5 years | 8–12 years without thread re-lubrication |
The new marine fastener line is available for bulk wholesale orders for all Russian coastal regions including Kaliningrad, Primorsky Krai and Black Sea coastal areas. Large-volume buyers can request full extended salt spray lab test reports and GOST compliance certificates for port infrastructure tender bidding.