Flat Head Socket Screws | McMaster-Carr

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About Flat Head Screws

18-8 Stainless Steel Hex Drive Flat Head Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless Steel
Hex Drive Flat Head Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Hex Drive Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless Steel
Hex Drive Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these metric screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Fine-Thread Metric 316 Stainless
Steel Hex Drive Flat Head Screws

Closely spaced threads on these screws fit in holes with a fine pitch. They're not compatible with standard metric threads.

Mil. Spec. Stainless Steel
Hex Drive Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

Alloy Steel Hex Drive Flat Head Screws

Metric Alloy Steel Hex Drive Flat Head Screws

Mil. Spec. Alloy Steel Hex Drive Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

Brass Hex Drive Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Metric Brass Hex Drive Flat Head Screws

These metric brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Alloy Steel Thread-Locking
Hex Drive Flat Head Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel flat head screws.

Stainless Steel Thread-Locking
Hex Drive Flat Head Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Vented Flat Head Screws

These screws are drilled through the shaft to vent fluids and gases trapped under the screw.

Metric Vented Flat Head Screws

To vent fluids and gases trapped under the screw, these metric screws are drilled through the shaft.

Left-Hand Threaded Flat Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Metric Left-Hand Threaded Flat Head Screws

Tighten these metric screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Fastener Assortments

Fastener Maintenance Assortments

Flat Head Screw Assortments

Flat head screws are angled under the head to fit flush within countersunk holes.