5/16"-18 Socket Head Cap Screws | McMaster-Carr

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Grade 2 Titanium

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Zinc Flake Coated

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Less than 20,000 psi

20,000 psi to 49,999 psi

50,000 psi to 69,999 psi

70,000 psi to 99,999 psi

100,000 psi or greater

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Unified Standard Class 2A

Unified Standard Class 3A

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647 Products

Socket Head Screws

Steel Socket Head Screws

Steel Socket Head Screws

The standard for high-strength fastening

Stainless Steel Socket Head Screws

Stainless Steel Socket Head Screws

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

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

Steel Socket Head Screws for High-Pressure Applications

Steel Socket Head Screws for High-Pressure Applications

Fasten tanks, valves, and flanges in high-pressure environments up to 1,100° F

Ultra-Low-Profile Steel Socket Head Screws

The lowest-profile socket head screw we offer

Stainless Steel Flanged Socket Head Screws

Stainless Steel Flanged Socket Head Screws

Corrosion resistant with a flange that spreads out pressure on thin and soft materials

Ultra-Low-Profile Stainless Steel Socket Head Screws

Corrosion resistant and the lowest-profile socket head screw we offer

Brass Socket Head Screws

Brass Socket Head Screws

A shiny look and won't rust in damp environments

Plastic Socket Head Screws

Plastic Socket Head Screws

Secure parts without adding much weight

Steel Torx Plus Socket Head Screws

Steel Torx Plus Socket Head Screws

Repeatedly tighten without stripping the socket

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

Titanium Socket Head Screws

Titanium Socket Head Screws

Lightweight like aluminum and more corrosion resistant than stainless steel

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

Left-Hand-Thread Steel Socket Head Screws

Left-Hand-Thread Steel Socket Head Screws

Turn left to tighten

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

Sealing Thread-Locking Socket Head Screws

Sealing Thread-Locking Socket Head Screws

Seal out contaminants and lock in air and fluid in vibrating systems

High-Profile Stainless Steel Socket Head Screws

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

Drop Prevention Socket Head Screws for Ratchet Wrenches

Drop Prevention Socket Head Screws for Ratchet Wrenches

The head locks into the square drive of a ratchet wrench so the screw won't fall

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

Bronze Socket Head Screws

Bronze Socket Head Screws

Stronger than brass screws and more corrosion resistant

Venting Socket Head Screws

Venting Socket Head Screws

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

Sealing Socket Head Screws

Sealing Socket Head Screws

Keep out dust and contaminants and lock in air and fluid

Brass-Tip Socket Head Screws

Brass-Tip Socket Head Screws

Stronger than nylon and still won't damage hard plastic and soft metals

Nylon-Tip Socket Head Screws

Nylon-Tip Socket Head Screws

Keep delicate, painted, and polished surfaces pristine

Other Products

Flat Head Screws

Flat Head Screws

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

Rounded Head Screws

Rounded Head Screws

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

Protective Plugs

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

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