6-40 Screws | McMaster-Carr

With a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. Install in a counterbored hole or above the surface.

Rounded Head Screws

A domed head sits above the surface of your material. Includes screws such as pan, button, binding, and truss head screws.

Flat Head Screws

Flat and oval head screws are angled under the head to fit in countersunk holes.

Set Screws

Unlike screws that hold materials together with threads, set screws exert pressure at the tip to hold objects in place.

Other Screws

Thread Adapters

Adapters connect two female threads, two male threads, or a male thread and a female thread.

Ball-Nose Spring Plungers

The ball nose rolls to minimize wear and allow parts to move in and out of position.

Center-Locating Punches
for Threaded Holes

Use the included handle to screw a punch into a hole.

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Screws and Bolts

Socket Head Screws