4-40 Thread Rounded Head Screws | McMaster-Carr

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60,000 psi to 79,999 psi

80,000 psi to 99,999 psi

100,000 psi to 119,999 psi

120,000 psi or greater

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815 Products

Rounded Head Screws

Stainless Steel Pan Head Phillips Screws

Stainless Steel Pan Head Phillips Screws

These pan head Phillips screws won't rust or corrode when exposed to moisture and chemicals

Steel Pan Head Phillips Screws

Steel Pan Head Phillips Screws

Our most popular steel pan head screws

Stainless Steel Button Head Hex-Drive Screws

Stainless Steel Button Head Hex-Drive Screws

These button head screws won't rust or corrode when exposed to moisture and chemicals

Aluminum Oversized-Flange Button Head Hex-Drive Screws

Aluminum Oversized-Flange Button Head Hex-Drive Screws

The lightest flanged screws we offer

Plastic Pan Head Phillips Screws

Plastic Pan Head Phillips Screws

Our most common plastic pan head screws

Left-Hand-Thread Stainless Steel Button Head Hex-Drive Screws

Left-Hand-Thread Stainless Steel Button Head Hex-Drive Screws

Turn these screws to the left to tighten them

Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Sharp internal washer teeth keep corrosion-resistant screws in place during vibration

Stainless Steel Pan Head Phillips Screws with Split Lock Washer

Stainless Steel Pan Head Phillips Screws with Split Lock Washer

Stop screws from loosening due to light vibration when fastening in corrosive environments

Steel Button Head Hex-Drive Screws

Steel Button Head Hex-Drive Screws

Made of alloy steel for nearly twice the tensile strength of other steel screws

Stainless Steel Pan Head Phillips Screws with Spring Lock Washer

Stainless Steel Pan Head Phillips Screws with Spring Lock Washer

A spring lock washer holds corrosion-resistant screws better than tooth-lock washers during vibration

Brass Round Head Slotted Screws

Brass Round Head Slotted Screws

The slotted round head has a shiny look, and these screws won't rust in damp environments

Stainless Steel Pan Head Combination Phillips/Slotted Screws

Stainless Steel Pan Head Combination Phillips/Slotted Screws

Our most corrosion-resistant combination Phillips/slotted screws

Brass Pan Head Phillips Screws

Brass Pan Head Phillips Screws

The Phillips pan head has a shiny look, and these screws won't rust in damp environments

Stainless Steel Truss Head Phillips Screws

Stainless Steel Truss Head Phillips Screws

Our most corrosion-resistant truss head Phillips screws

Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Sharp internal teeth hold screws in place despite frequent movement and vibration

Brass Button Head Hex-Drive Screws

Brass Button Head Hex-Drive Screws

The button head has a shiny look, and these screws won't rust in damp environments

Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

External washer teeth grip corrosion-resistant screws better than internal teeth during vibration

Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Sealing Thread-Locking Stainless Steel Pan Head Phillips Screws

Keep parts from coming loose while keeping out contaminants and locking in air and fluid

Stainless Steel Round Head Phillips Screws

Stainless Steel Round Head Phillips Screws

The most corrosion-resistant round head Phillips screws we offer

Stainless Steel Oversized-Flange Button Head Hex-Drive Screws

Stainless Steel Oversized-Flange Button Head Hex-Drive Screws

Up to twice the diameter of standard flanges to spread pressure over a larger area without a washer

Sealing Stainless Steel Pan Head Phillips Screws

Sealing Stainless Steel Pan Head Phillips Screws

Keep out dust and contaminants while locking in air and fluid

Stainless Steel Binding Head Slotted Screws

Stainless Steel Binding Head Slotted Screws

Our most corrosion-resistant binding head screws

Steel Round Head Slotted Screws

Steel Round Head Slotted Screws

The round head has the simplest drive style

Steel Round Head Phillips Screws

Steel Round Head Phillips Screws

A domed profile that gives a decorative look

Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws

Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws

The unique two-hole design inhibits tampering

Tamper-Resistant One-Way-Drive Steel Round Head Screws

Tamper-Resistant One-Way-Drive Steel Round Head Screws

Install with a slotted driver but need a special tool to remove

Stainless Steel Fillister Head Slotted Screws

Stainless Steel Fillister Head Slotted Screws

The most corrosion-resistant fillister head slotted screws we offer

Brass Pan Head Slotted Screws

Brass Pan Head Slotted Screws

The slotted pan head has a shiny look, and these screws won't rust in damp environments

Stainless Steel Button Head Torx Screws

Stainless Steel Button Head Torx Screws

Our most corrosion-resistant button head Torx screws

Stainless Steel Truss Head Slotted Screws

Stainless Steel Truss Head Slotted Screws

Our most corrosion-resistant truss head slotted screws

Steel Fillister Head Slotted Screws

Steel Fillister Head Slotted Screws

The tall, narrow head reduces the chance of slotted drivers slipping and fits into tight spaces

Steel Round Head Combination Phillips/Slotted Screws

Steel Round Head Combination Phillips/Slotted Screws

Two common drive styles in a single screw

Plastic Pan Head Slotted Screws

Plastic Pan Head Slotted Screws

Lightweight and nonconductive with the simplest drive

Plastic Binding Head Slotted Screws

Plastic Binding Head Slotted Screws

Keep wires in place while preventing connections from short circuiting

Plastic Fillister Head Slotted Screws

Plastic Fillister Head Slotted Screws

Lightweight and nonconductive with a tall head and narrow diameter

Plastic Round Head Slotted Screws

Plastic Round Head Slotted Screws

Create a finished appearance on panels and covers with the smooth, domed head

Stainless Steel Round Head Slotted Screws

Stainless Steel Round Head Slotted Screws

Our most corrosion-resistant round head slotted screws

Stainless Steel Pan Head Slotted Screws

Stainless Steel Pan Head Slotted Screws

The most corrosion-resistant pan head slotted screws we offer

Thread-Locking Stainless Steel Pan Head Phillips Screws

Thread-Locking Stainless Steel Pan Head Phillips Screws

Corrosion and vibration resistant, these pan head screws secure parts during mild vibration

Steel Pan Head Slotted Screws

Steel Pan Head Slotted Screws

The pan head has the simplest drive style

Steel Pan Head Torx Screws

Steel Pan Head Torx Screws

A deep six-lobe opening prevents your driver from slipping and stripping drives

Steel Flanged Button Head Hex-Drive Screws

Steel Flanged Button Head Hex-Drive Screws

Our strongest flanged rounded head screws

Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Steel Pan Head Phillips Screws with External-Tooth Lock Washer

External teeth provide a stronger grip than internal-tooth lock washers during frequent vibration

Steel Button Head Torx Plus Screws

Steel Button Head Torx Plus Screws

Our strongest Torx Plus rounded head screws

Stainless Steel Flanged Button Head Hex-Drive Screws

Stainless Steel Flanged Button Head Hex-Drive Screws

Secure thin and soft materials in corrosive environments without needing a separate washer

Stainless Steel Pan Head Torx Plus Screws

Stainless Steel Pan Head Torx Plus Screws

The most corrosion-resistant pan head Torx Plus screws we offer

Steel Pan Head Phillips Screws with Spring Lock Washer

Steel Pan Head Phillips Screws with Spring Lock Washer

Grip tighter for better vibration resistance than tooth-lock washers

Tamper-Resistant Torx Stainless Steel Button Head Screws

Tamper-Resistant Torx Stainless Steel Button Head Screws

Deter unauthorized access in corrosive environments

Brass Binding Head Slotted Screws

Brass Binding Head Slotted Screws

Conductive and nonmagnetic with a wide, tapered head

Stainless Steel Button Head Torx Plus Screws

Stainless Steel Button Head Torx Plus Screws

Our most corrosion-resistant button head Torx Plus screws

Stainless Steel Fillister Head Phillips Screws

Stainless Steel Fillister Head Phillips Screws

The most corrosion-resistant fillister head Phillips screws we offer

Stainless Steel Pan Head Phillips Screws with Flat and Split Lock Washer

Stainless Steel Pan Head Phillips Screws with Flat and Split Lock Washer

Stop screws from coming loose due to light vibration while protecting your surface from damage

Steel Binding Head Slotted Screws

Steel Binding Head Slotted Screws

A wide, tapered top clamps down on electrical connections

Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Corrosion and vibration resistant, these button head screws secure parts during mild vibration

Wire-Locking Stainless Steel Fillister Head Slotted Screws

Wire-Locking Stainless Steel Fillister Head Slotted Screws

The best vibration resistance of our rounded head screws

Steel Pan Head Torx Plus Screws

Steel Pan Head Torx Plus Screws

Larger lobes than Torx withstand even more torque without the driver slipping and stripping the drive

Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Our most corrosion-resistant hex-drive screws for preventing unauthorized access

Tamper-Resistant Hex-Drive Steel Button Head Screws

Tamper-Resistant Hex-Drive Steel Button Head Screws

Our strongest hex-drive screws for deterring unauthorized access

Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws

Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws

Install with a slotted driver in corrosive environments and remove with a special tool

Thread-Locking Steel Button Head Hex-Drive Screws

Thread-Locking Steel Button Head Hex-Drive Screws

Strong and vibration resistant to lock parts in place on machinery that experiences mild vibration

Brass Fillister Head Slotted Screws

Brass Fillister Head Slotted Screws

The slotted fillister head has a shiny look, and these screws won't rust in damp environments

Stainless Steel Oversized Truss Head Slotted Screws

Stainless Steel Oversized Truss Head Slotted Screws

Protect thin materials with a head that's up to twice the size of standard truss screws

Steel Pan Head Phillips Screws with Split Lock Washer

Steel Pan Head Phillips Screws with Split Lock Washer

Stop screws from loosening due to light vibration

Tamper-Resistant Torx Steel Button Head Screws

Tamper-Resistant Torx Steel Button Head Screws

Our strongest tamper-resistant Torx screws

Titanium Pan Head Phillips Screws

Titanium Pan Head Phillips Screws

Lightweight like aluminum and more corrosion resistant than stainless steel

Venting Stainless Steel Button Head Hex-Drive Screws

Venting Stainless Steel Button Head Hex-Drive Screws

Prevent the buildup of pressure or vacuum in sealed spaces

Thread-Locking Stainless Steel Button Head Torx Screws

Thread-Locking Stainless Steel Button Head Torx Screws

These corrosion-resistant Torx screws keep parts in place on machinery with vibration

Titanium Button Head Hex-Drive Screws

Titanium Button Head Hex-Drive Screws

Nearly as strong as alloy steel but only 40% of the weight

Other Products

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Oval Head Screws

Oval Head Screws

The domed top sits slightly above the surface of countersunk holes for a decorative look

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)