Alloy Steel Screws | McMaster-Carr


Hex	External Hex	Phillips

Slotted	Torx Plus	Torx

Tamper- Resistant Torx	External 12-Point	External Square

Hex with Pilot Recess	Tamper- Resistant Hex	Tamper- Resistant Torx Plus

	Threading Threading

	Fully Threaded
	Partially Threaded
	Threaded on Both Ends

	Socket Head Profile Socket Head Profile


Standard	Low

Ultra-Low

	Thread Direction Thread Direction

Right Hand

Left Hand

Right Hand and Left Hand

	Head Diameter Head Diameter

	Head Height Head Height

	Thread Pitch Thread Pitch

	Thread Type Thread Type

	Specifications Met Specifications Met

ASME

ASTM

DIN

IFI

ISO

Mil. Spec.

NAS

SAE

	Drive Size Drive Size

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Tensile Strength Tensile Strength

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Thread Fit Thread Fit

	Hardness Hardness

	Flat Head Profile Flat Head Profile


Standard	Undercut

	Countersink Angle Countersink Angle

10,149 Products

Screws and Bolts

Socket Head Screws

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.

Tapping, Wood, and Drywall Screws

While other screws and bolts require holes with threads, tapping screws create their own threads.

Shoulder Screws

A cylindrical shoulder under the head allows parts to rotate around and slide along its length, so these screws are often used to guide and align components.