Difference Between Self-Tapping Screws and Non-Self-Tapping Screws

Self-Tapping Screws

Non-Self-Tapping Screws

Cut their own thread path during the insertion of the screw. Not need taping before insertion.

Requires a pre-drilled pilot hole and thread pathways before inserting the screw.

Simple and rapid screw fastening

Require more steps for operation, including drilling a pilot hole and tapping the hole

Need more amount of torque to drive the screw into the material to surpass friction

The torque required to surpass friction is minimum when compared to a self-tapping screw.

They are difficult to tighten, a portion of torque applied is used to overcome friction during thread cut.

A greater portion of applied torque will be transformed into effective tensile force in the screw.

Since they require high axial load, there is a risk of fracture displacement during bone surgery. They are prone to stripping or cracking the boss.

Because it requires less axial load, there is less risk of fracture displacement

Self-tapping screws are not meant for repeated assembling dissembling.

Since they are inserted into pre-drilled thread pathways, they can be assembling dissembling repeatedly without the fear of accidental damage

They are widely used in bone surgery, dental implantation, orthopaedic bone fixation, carpentry, attaching removable parts, etc.

General-purpose fasteners for assembling materials with a pre-drilled hole

Advantages: Eliminates the need for pre-tapping, reduces operative time, creates a tight fit, requires fewer steps for operation, etc.

Advantages: Suitable for precise application, high torque, easier to tighten, no risk of thread deformation, etc.