CAD & PTFE Coated ASTM A194 2H Nuts Delivered Urgently to an Asia-Pacific LNG Plant

Overview

An LNG operator in the Asia-Pacific region needed ASTM A194 Grade 2H heavy hex nuts finished with a cadmium plating base and a PTFE topcoat to match the existing installed bolting system on a process flange package. Substituting a different coating was not acceptable because friction behaviour drives the tightening procedure already issued for the joint.

Challenge

Cadmium plating is a controlled process with a shrinking applicator base, and the PTFE topcoat had to be applied over it to a specified dry film thickness without clogging threads. The plant needed nuts in hand within days, not weeks, and any coating variation would have invalidated the site torque values.

Solution

EMG drew on certified 2H nut stock and moved it directly to an approved plating and coating line, controlling cadmium thickness and PTFE dry film thickness as a single inspection sequence. Nut threads were gauged after coating to confirm free assembly onto the mating studs, then packed in partitioned cartons to prevent coating damage in transit and released on expedited air freight.

Results

• Nuts plated, coated, gauged and dispatched on an urgent expedited schedule
• Coating friction consistent with the site's existing torque procedure
• Threads gauged after coating — zero assembly issues at the plant
• Damage-free arrival through partitioned export packing

Compliance & Documentation

EN 10204 Type 3.1 material certification for the A194 2H nuts with heat traceability, plus cadmium plating thickness records and PTFE topcoat dry film thickness verification supplied as part of the documentation pack.

Products Supplied

• ASTM A194 2H Heavy Hex Nuts
• PTFE and CAD Coating Systems
• ASTM A193 B7 Stud Bolts