Marine and offshore
The failure mode
Salt spray finds every scratch. A zinc-plated stud on an offshore deck will be rusting inside a year, and a stainless one will gall on the first tightening if it goes on dry.
What we supply
B8M stainless or PTFE-coated B7. The PTFE does two jobs at once — it keeps the salt out and it gives a predictable friction coefficient for torque control.
Grades used here
ASTM A193 Grade B8M Class 1
Austenitic stainless steel, AISI 316
ASTM A193 Grade B8M Class 2
Austenitic stainless steel, AISI 316
ASTM A193 Grade B7
Chromium-molybdenum alloy steel (AISI 4140 / 4142 / 4145)
ASTM A194 Grade 8M
Austenitic stainless steel, AISI 316
Recommended coatings
PTFE fluoropolymer (Xylan 1424)
Offshore and subsea flanges, sour service, stainless bolting, and any joint tightened with a calibrated torque or tensioning tool.
Hot dip galvanizing
Structural steelwork, anchor bolts, pipe supports, transmission towers — anything outdoors, exposed, and not routinely dismantled.
Need a quotation?
Send us the grade, size and quantity. We reply within one working day with price, lead time and the certificate package included.