How to Prevent Leakage in Ferrule Fittings – A Complete Guide by PE-LOCK

Follow the Correct Tightening Procedure

First Installation (Double Ferrule):

• Tighten the nut 1-1/4 turns from finger-tight (after initial snug)
• Always mark the nut and fitting body to verify rotation

Reassembly:

Only 1/8 to 1/4 turn past snug is required
🔧 Never overtighten during reinstallation—this can crack ferrules

Don’t Reuse Deformed Ferrules

• Ferrules are designed to permanently swage onto the tube
• Reusing old ferrules can cause leaks due to deformed contact faces
  Always replace ferrules and nuts when reusing fitting bodies

Match Tube and Fitting Materials

• Avoid galvanic corrosion (e.g., brass tube in SS fitting or vice versa)
• Match tubing and ferrule alloys whenever possible
• Use Monel, Hastelloy, or PTFE-coated options for aggressive media

Avoid Mixing Brands

• Fitting body from Brand A + Ferrule from Brand B = misaligned tolerances
• Always use PE-LOCK ferrules and nuts with PE-LOCK bodies