It’s happened to almost all of us.
You get a brand new framelock folding knife in the mail and eagerly engage it. Everything seems fine as the knife opens smoothly and effortlessly. But, just as you’re closing it, you notice the framelock is extremely difficult to disengage.
This is known colloquially as lock stick.
Unfortunately, it’s an all-too-common issue in framelocks and even liner locks. The good thing is that there are several ways to go about fixing it.
What Causes Lock Stick?
In the most basic terms, lock stick is when a framelock or liner lock feels sticky when trying to unlock it. This makes it more difficult and sometimes even painful to disengage.
That’s the definition of lock stick, but what actually causes the major knife annoyance?
Galling
The cause of the issue is multifaceted. One of the reasons has to do with the lockbar material and the blade steel. Lock stick happens most prominently in knives with titanium handles because titanium is susceptible to galling and tends to stick to dissimilar metals.
For example, if you have a titanium lockbar contacting with the tang of an S35VN blade, they have the tendency to stick to one another. That’s why this issue isn’t reserved only for budget knives but also affects pricier ones.