Socket Head Cap Screws are cap screws that have cylindrical heads and recessed hexagonal drive holes. Standard styles have a flat chamfered cap head that is typically knurled and have head height that is the same as the screw’s thread diameter. Low profile styles are great for limited head space, but are not recommended for high-strength applications.
Also known as socket cap screws, socket drive fasteners, socket screws or Allen socket bolts, they are installed and removed with a socket wrench or an Allen hex key.
Socket head cap screws are often used in industrial applications on machinery assembly, and are ideal for installations where space is tight, and where there are removable parts and panels. If a smooth appearance is what you are wanting, these are the screws for you as the countersinking provides a strong hold with a finished appearance.
Socket head screws come in fully and partially threaded styles. Fully threaded fasteners have a tapped, threaded hole all the way to the head. Partially threaded styles have an unthreaded portion under the head that provides more holding power, and more strength than fully threaded screws.
Parker Fasteners is the leading U.S. manufacturer of cold heading socket head cap screws. They use DFARS-sourced steel to create a fastener that is higher strength than a normal screw, and withstands more torque for a tighter hold. Parker Fasteners socket head cap screws come in a variety of styles, finishes and sizes. Here we will discover 7 styles of socket cap screws that Parker Fasteners manufactures and Advance Components stocks.
18-8 Stainless Steel
These socket screws are made of strong 18-8 stainless steel that is chemical resistant and vibration proof. Available in standard and metric sizes, and fully threaded or partially threaded. The length is measured from under the head.
18-8 Stainless Steel Low Profile
Socket screws with a low profile head have a smaller internal socket drive. The cap head is half the size of a standard socket cap screw. Ideal for applications where space is limited, or on flush applications. Low profile cap screws have a low clearance and do not tolerate the same preloads as standard head caps. Not recommended for high-torque fastening.
These socket screws are made of alloy steel with a matt black finish that is chemical resistant and vibration proof. Available in standard and metric sizes, and fully threaded or partially threaded. The length is measured from under the head.
Black Oxide Low Profile
Black oxide alloy steel screws with a low profile head have a smaller internal socket drive. The cap head is half the size of a standard socket cap screw. Ideal for applications where space is limited, or on flush applications. Low profile cap screws have a low clearance and do not tolerate the same preloads as standard head caps.
Black Oxide with a Flat Washer (SEMS)
Matt black oxide screws have a permanently attached washer that freely rotates as pressure is distributed over a wider area. Ideal for applications to protect material surfaces from damage.
A286 High Strength Stainless Steel
These socket drive screws provide the strongest holding power as they combine the strength of alloy steel with the corrosion resistance properties of 18-8 stainless steel. Available in fully and partial threaded styles, the length is measured from under the head.
B7 Socket Head Cap Screws
Made of high-temperature alloy steel – grade B7, these socket cap screws are ideal for high pressure and temperature applications. They can withstand temperatures up to 1100 degrees fahrenheit, and are specially tempered to meet ASTM A193 specifications. Available in fully threaded styles.
Forging the Future Together
Parker Fasteners Socket Screws provide a strong grip that is corrosion and vibration resistant. Advance Components is proud to partner with Parker as an authorized master distributor. We are committed to “Forging The Future” together with Parker by providing our customers with a large variety of socket screws, customer support with applications, and value-added services.