Socket Head Cap Screw

Our socket head cap screw gives you compact, high-strength fastening wherever space is tight and performance expectations are high. Built for demanding assemblies, our socket head cap screws combine precise tolerances with reliable clamp load, so you can trust every joint to stay secure under real-world conditions. From machinery and tooling to automation and custom builds, our socket head cap screws help you create cleaner designs, faster assemblies, and longer-lasting connections.

Dependable Fastening You Can Count On

Our socket head cap screws feature a cylindrical head with an internal hex drive that allows you to apply high levels of torque without sacrificing accessibility in confined spaces. The deep hex socket reduces the risk of cam-out, helping your tools stay seated so you can tighten with confidence and consistency. Whether you are building new equipment or maintaining existing machinery, our socket head cap screws provide the strength, precision and repeatability your process demands. 

Alongside our core socket range, we also offer Flat Head Socket, Button Head Socket and Low Head Socket options when you need a flush surface, a smooth low-profile appearance or extra clearance.

DIN 912 Socket Head Cap Screws

Our DIN 912 socket head cap screws follow one of the most trusted standards in engineering, giving you a fastener that is easy to specify and straightforward to substitute in global designs. These screws have a cylindrical head with an internal hex drive, designed for applications that require high strength, exact alignment and consistent clamping forces. 

Available in a range of property classes, they allow you to match tensile strength and toughness to the demands of your assembly, from general-purpose fastening right through to highly loaded structural joints. With ISO 4762 as the international equivalent of DIN 912, our socket head cap screws integrate seamlessly into designs that must meet global standards and documentation requirements.

Strength, Precision And Clean Design

Choosing our socket head cap screws means you can achieve high clamp loads without oversized heads that crowd your design. The compact head profile frees up space around the joint for moving parts, adjacent components or routing of cables and hoses, while the internal hex drive keeps the top of the head clean and snag-free. This combination of strength and compactness is ideal wherever countersunk heads are not suitable but traditional hex bolts feel bulky, such as in machine frames, linear guides, fixtures and tooling plates.

Material And Finish Options

We understand that fasteners must match the environment and duty cycle of your equipment, so our socket head cap screws are available in a variety of materials and finishes. From standard alloy steel for maximum strength, to stainless options for corrosion resistance and clean aesthetics, you can choose the specification that best fits your project. Surface treatments and coatings help improve wear resistance and durability, supporting long-term reliability even in harsh conditions or frequent assembly and disassembly. 

Applications Of Socket Head Cap Screws

Our socket head cap screws are the fastener of choice across a wide range of industries, including automation, industrial machinery, robotics, automotive and metal fabrication. Their high tensile strength and precise threading help maintain alignment in frames, brackets and moving assemblies, reducing the risk of loosening or misalignment over time. 

Because the internal hex drive allows easy access from above, they are especially useful in tight spaces where a traditional wrench cannot reach, such as equipment guards, tool holders and modular fixtures. Wherever you need dependable performance in a compact, professional-looking package, our socket head cap screws deliver.

FAQs

What is a socket head cap screw?

A socket head cap screw is a high-strength fastener with a cylindrical head and an internal hex drive, designed to be tightened with a hex key or Allen wrench. Unlike standard hex bolts, the head is more compact, which lets you place fasteners closer together or near obstructions without sacrificing torque.

Are socket head cap screws stronger?

Socket head cap screws are typically manufactured from higher-strength materials and are available in higher property classes than many standard screws and bolts. This means they can handle greater tensile loads and higher tightening torques when used correctly and within their rated limits. 

How to tighten a socket head cap screw?

To tighten a socket head cap screw, start by ensuring the threads in both the screw and the mating component are clean and undamaged. Seat the correct size hex key or bit firmly into the socket, then apply steady, even torque until the joint is fully clamped to your specified torque value. 

Do you use washers with socket head cap screws?

Washers can be used with socket head cap screws when you need to spread the load over a wider surface, protect softer materials from damage or accommodate oversized or slotted holes. In some precision assemblies, the screw head is designed to bear directly against a machined surface, and additional washers may not be necessary.