Stainless Steel Hose Fitting Peeling After Crimping? Here’s The Real Reason.

Some customers find that after crimping, the surface of their stainless steel hose fittings starts to peel or flake.
At first glance, many think it’s a material problem. But that’s not the case.

The real cause is oxide scale left on the blank.

During forging and heat treatment, a layer of oxide scale forms on the surface of stainless steel blanks.
If this layer is not fully removed before crimping, it stays on the surface.

Crimping puts strong pressure on the fitting. The metal underneath stretches and changes shape.
But the oxide scale is brittle—it cannot stretch with the base metal. So it cracks, breaks, and peels off.
That’s the “peeling” you see.

How We Solve It at HAND HYDRAULIC

We focus on three steps:

1. Strict incoming inspection
   Blanks with heavy scale are rejected before they enter production.

2. Thorough surface cleaning
   We use shot blasting and pickling to remove all oxide scale. The base metal is fully exposed.

3. Proper crimping control
   We use precise crimping parameters. No over-crimping. This protects the surface and keeps the fitting strong.

Good control from the start helps us stop peeling before it happens.
The result: clean appearance and reliable quality.

HAND HYDRAULIC
Reliable connections you can count on.