What should I do if can't suck the cross-countersunk self-tapping screw?

A customer said that his crosshairs self-tapping #screw is made of stainless steel, used in a relatively humid environment, and the locking position is relatively narrow. The screwdriver on the screwdriver has not reached the designated place and can not be absorbed. The screw will fall off. Ask us if there is a solution.

According to the customer's problem, we recommend that the customer replace the material with carbon steel so that the magnetic properties of the screw can be increased to solve the problem of unabsorbable. However, the customer said he used an iron-galvanized crosshairs self-tapping screw, but it quickly rusted, so they switched to stainless steel but could not absorb the #stainless steel screw.

According to the customer's requirements, this requires a surface treatment with strong corrosion resistance, such as Dacromet, the zinc-nickel alloy can pass at least 1000 hours of salt spray, but this also needs to ask how long the customer needs salt spray time. Like the current iron galvanized #screws , because of environmental protection reasons, it basically can not exceed 24 hours.

Later, we recommended the surface treatment of zinc-nickel alloy to the customer according to the customer's salt spray time. Also replaced, the material with carbon steel, and the customer found that it solved the problem of her previous crosshair self-tapping screw after testing.