Square Fasteners | McMaster-Carr

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About Tapping Screws

Socket Head Screws for Square-Drive Wrenches

No need for separate bits—these screws lock directly onto square-drive socket wrenches, reducing the risk of dropping parts during installation.

Tapping Screws for Metal

18-8 Stainless Steel Square-Drive
Rounded Head Screws for Sheet Metal

18-8 stainless steel screws have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless Steel
Square-Drive Rounded Head Screws for Sheet Metal

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

Steel Square-Drive Rounded
Head Screws for Sheet Metal

These steel screws are zinc plated to resist corrosion in wet environments.

Square-Drive Flanged Extra-Wide
Rounded Head Screws for Sheet Metal

These square-drive screws have a flange under the head that distributes holding pressure and reduce the risk of crushing thin metal.

Square-Drive Flat Head Screws for Sheet Metal

These square-drive screws are beveled under the head for use in countersunk holes.

Square-Drive Rounded Head
Drilling Screws for Metal

By drilling their own holes and fastening in a single operation, these square-drive screws save time and effort. Made of 410 stainless steel, they're both stronger and more wear resistant than 18-8 stainless steel screws.

Low-Profile Rounded Head Drilling Screws for Metal

Also known as pancake head screws, these have a head that is about two-thirds the height of standard rounded head screws.

Rounded Head Drilling Screws for Aluminum

Made from stainless steel to resist galvanic corrosion, use these screws to fasten aluminum to aluminum and steel framing. They save you time and effort by drilling their own holes and fastening in a single operation.

Rounded Head Screws for Joining Plastic to Wood

Cutting wings under the head allow plastic to expand and contract without cracking. A washer made from aluminum and rubber bonded to steel adds a watertight seal.

Screws for Wood

Steel Square-Drive Flat Head Screws for Wood

Beveled under the head for use in countersunk holes, these steel screws press threads into material for a tight, secure hold.

Brass Square-Drive Flat-Head Screws for Wood

Brass screws are corrosion resistant in wet environments and electrically conductive.

Screws for Hardwood

Also known as Type 17 auger point screws, these penetrate hardwood and reduce driving torque. They require a pilot hole to prevent splitting when used near an edge.

Steel Rounded Head Screws for
Plywood and Oriented Strand Board

These steel screws are zinc plated to resist corrosion in wet environments.

Steel Flat Head Screws for Plywood
and Oriented Strand Board

These steel screws are zinc plated to resist corrosion in wet environments.

18-8 Stainless Steel Flat Head Screws
for Plywood and Oriented Strand Board

18-8 stainless steel screws have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Thread-Cutting Small-Head Screws
for Softwood and Plastic-Wood Composites

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

18-8 Stainless Steel Thread-Cutting Small-Head
Screws for Softwood and Plastic-Wood Composites

18-8 stainless steel screws have good chemical resistance.

Thread-Forming Small-Head Screws for
Softwood and Plastic-Wood Composites

Thread-forming screws press threads into drilled holes for a tight, vibration-resistant assembly.

18-8 Stainless Steel Square-Drive Screws
for Softwood and Plastic-Wood Composites

18-8 stainless steel screws have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Square-Drive Screws for
Softwood and Plastic-Wood Composites

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

Sealing Screws for Softwood
and Plastic-Wood Composites

The neoprene-backed washer seals out contaminants.

Small-Head Screws for Drywall

Square-Drive Small-Head Drilling Screws
for Joining Drywall to Metal Framing

These square-drive screws have a drill point that powers through drywall and into metal studs up to 0.105" thick. Heads are one-third smaller than those of other drywall screws.

Square-Drive Small-Head Screws
for Joining Drywall to Metal Framing

With a square-drive head, these screws attach drywall to metal studs up to 0.036" thick. The head is one-third smaller than other drywall screws.

About Tapping Screws

Socket Head Screws for Square-Drive Wrenches

Socket Head Screws for Square-Drive Wrenches

Tapping Screws for Metal

18-8 Stainless Steel Square-DriveRounded Head Screws for Sheet Metal

Super-Corrosion-Resistant 316 Stainless SteelSquare-Drive Rounded Head Screws for Sheet Metal

Steel Square-Drive RoundedHead Screws for Sheet Metal

Square-Drive Flanged Extra-WideRounded Head Screws for Sheet Metal

Square-Drive Flat Head Screws for Sheet Metal

Square-Drive Rounded HeadDrilling Screws for Metal

Low-Profile Rounded Head Drilling Screws for Metal

Rounded Head Drilling Screws for Aluminum

Rounded Head Screws for Joining Plastic to Wood

Rounded Head Screws for Joining Plastic to Wood

Screws for Wood

Steel Square-Drive Flat Head Screws for Wood

Brass Square-Drive Flat-Head Screws for Wood

Screws for Hardwood

Steel Rounded Head Screws forPlywood and Oriented Strand Board

Steel Flat Head Screws for Plywoodand Oriented Strand Board

18-8 Stainless Steel Flat Head Screwsfor Plywood and Oriented Strand Board

Super-Corrosion-Resistant 316 StainlessSteel Thread-Cutting Small-Head Screws for Softwood and Plastic-Wood Composites

18-8 Stainless Steel Thread-Cutting Small-HeadScrews for Softwood and Plastic-Wood Composites

Thread-Forming Small-Head Screws forSoftwood and Plastic-Wood Composites

18-8 Stainless Steel Square-Drive Screwsfor Softwood and Plastic-Wood Composites

Super-Corrosion-Resistant 316Stainless Steel Square-Drive Screws for Softwood and Plastic-Wood Composites

Sealing Screws for Softwoodand Plastic-Wood Composites

Small-Head Screws for Drywall

Square-Drive Small-Head Drilling Screwsfor Joining Drywall to Metal Framing

Square-Drive Small-Head Screwsfor Joining Drywall to Metal Framing

18-8 Stainless Steel Square-Drive
Rounded Head Screws for Sheet Metal

Super-Corrosion-Resistant 316 Stainless Steel
Square-Drive Rounded Head Screws for Sheet Metal

Steel Square-Drive Rounded
Head Screws for Sheet Metal

Square-Drive Flanged Extra-Wide
Rounded Head Screws for Sheet Metal

Square-Drive Rounded Head
Drilling Screws for Metal

Steel Rounded Head Screws for
Plywood and Oriented Strand Board

Steel Flat Head Screws for Plywood
and Oriented Strand Board

18-8 Stainless Steel Flat Head Screws
for Plywood and Oriented Strand Board

Super-Corrosion-Resistant 316 Stainless
Steel Thread-Cutting Small-Head Screws
for Softwood and Plastic-Wood Composites

18-8 Stainless Steel Thread-Cutting Small-Head
Screws for Softwood and Plastic-Wood Composites

Thread-Forming Small-Head Screws for
Softwood and Plastic-Wood Composites

18-8 Stainless Steel Square-Drive Screws
for Softwood and Plastic-Wood Composites

Super-Corrosion-Resistant 316
Stainless Steel Square-Drive Screws for
Softwood and Plastic-Wood Composites

Sealing Screws for Softwood
and Plastic-Wood Composites

Square-Drive Small-Head Drilling Screws
for Joining Drywall to Metal Framing

Square-Drive Small-Head Screws
for Joining Drywall to Metal Framing