4-40 Thread Socket Head Screws | McMaster-Carr

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Stainless Steel

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20,000 psi to 49,999 psi

50,000 psi to 59,999 psi

60,000 psi to 99,999 psi

100,000 psi or greater

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Unified Standard Class 2A

Unified Standard Class 2B

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1,166 Products

Socket Head Screws

Stainless Steel Socket Head Screws

Stainless Steel Socket Head Screws

Won't rust or corrode when exposed to moisture and chemicals

Steel Socket Head Screws

Steel Socket Head Screws

The standard for high-strength fastening

Low-Profile Steel Socket Head Screws

The shorter head won't snag on components

Low-Profile Stainless Steel Socket Head Screws

Corrosion resistant with a shorter head that won't snag on components

Plastic Socket Head Screws

Plastic Socket Head Screws

Secure parts without adding much weight

Aluminum Socket Head Screws

Aluminum Socket Head Screws

One-third the weight of steel

Brass Socket Head Screws

Brass Socket Head Screws

A shiny look and won't rust in damp environments

Steel Torx Plus Socket Head Screws

Steel Torx Plus Socket Head Screws

Repeatedly tighten without stripping the socket

Ultra-Low-Profile Steel Socket Head Screws

The lowest-profile socket head screw we offer

Venting Socket Head Screws

Venting Socket Head Screws

A hole prevents the buildup of pressure and vacuum in sealed spaces

Steel Flanged Socket Head Screws

Steel Flanged Socket Head Screws

The flange spreads pressure over a wide area to protect thin and soft materials

Stainless Steel Thread-Locking Socket Head Screws

Stainless Steel Thread-Locking Socket Head Screws

Corrosion resistant with a bonded nylon patch so you don't have to add threadlocker yourself

Cleaned and Bagged Socket Head Screws for High Vacuum

Cleaned and Bagged Socket Head Screws for High Vacuum

Cleaned and double-bagged for use in high-vacuum systems that can't tolerate any contamination

Titanium Socket Head Screws

Titanium Socket Head Screws

Lightweight like aluminum and more corrosion resistant than stainless steel

Nickel Socket Head Screws

Nickel Socket Head Screws

The strongest ultra-corrosion-resistant screws we offer

Sealing Socket Head Screws

Sealing Socket Head Screws

Keep out dust and contaminants and lock in air and fluid

High-Profile Stainless Steel Socket Head Screws

Fasten parts in hard-to-reach places, such as deep holes tucked inside machinery

Steel Socket Head Screws with Flat Washer

Steel Socket Head Screws with Flat Washer

A freely rotating washer protects thin and soft surfaces from damage

Stainless Steel Wire-Locking Socket Head Screws

Stainless Steel Wire-Locking Socket Head Screws

Our most vibration- and corrosion-resistant socket head screws

Steel Wire-Locking Socket Head Screws

Steel Wire-Locking Socket Head Screws

Our most vibration-resistant socket head screws

Steel Thread-Locking Socket Head Screws

Steel Thread-Locking Socket Head Screws

Lock parts in place on vibrating machinery without having to add threadlocker yourself

Cleaned and Bagged Venting Socket Head Screws for High Vacuum

Cleaned and Bagged Venting Socket Head Screws for High Vacuum

Reduce the time it takes to reach vacuum conditions in high-vacuum systems

Steel Socket Head Screws with Split Lock Washer

Steel Socket Head Screws with Split Lock Washer

Won't come loose from light vibration

Other Products

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

Rounded Head Screws

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

Shoulder Screws

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Tighten and loosen by hand without the need for tools

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