HEX SOCKET HEAD CAP SCREWS

Our Allen Head Screws, also known as hex socket head cap screws or socket head screws, are designed for applications where high clamping performance, compact installation, and reliable fastening are required. Featuring a recessed internal hexagon drive, these screws can be installed with an Allen key or hex bit, allowing effective tightening even where access around the fastener is limited. Their cylindrical head and compact overall design also make them suitable for applications where a conventional hex head bolt would require excessive installation space. As a result, Allen Head Screws are widely used in machinery, automation equipment, automotive components, molds and dies, precision equipment, metal fabrication, industrial assemblies, and mechanical engineering.

1035, 1045 and 40Cr Steel Options

Our Allen Head Screws are manufactured from 1035 carbon steel, 1045 carbon steel, and 40Cr alloy steel, providing different material options for varying mechanical and application requirements. 1035 carbon steel offers a practical balance of strength, machinability, and cost efficiency for general-purpose fastening, while 1045 carbon steel provides a higher-strength option for applications requiring improved mechanical performance. For more demanding fastening requirements, 40Cr alloy steel offers a suitable material option for higher-strength mechanical applications.

Available metric property classes include 4.8, 6.8, 8.8, and 10.9 according to ISO 898-1, covering a broad range from general industrial fastening to higher-strength mechanical assemblies. For inch-series applications, we offer SAE J429 Grade 2 and Grade 5, allowing buyers to source Allen Head Screws for both metric and imperial fastening systems.

Internal Hex Drive for Efficient Installation

The defining feature of an Allen Head Screw is its internal hexagonal socket, which provides several practical advantages during assembly. Instead of requiring access around the outside of the head, the fastener can be tightened directly through the internal socket using an Allen key, hex wrench, or compatible power tool.

This makes socket head screws particularly useful in confined spaces, recessed mounting locations, compact machine assemblies, and applications with limited tool clearance. The cylindrical head also provides a relatively compact fastening profile, allowing designers to place fasteners closer together or within smaller mechanical assemblies where conventional hex head bolts may be difficult to accommodate. For equipment manufacturers and assembly operations, this design combines compact geometry, secure tool engagement, and efficient tightening, making Allen Head Screws a versatile choice for modern mechanical fastening.

DIN 912 and ASME B18.3 Standards

Our Allen Head Screws are manufactured according to recognized international standards, including DIN 912 and ASME B18.3, supporting both metric and inch-series requirements. DIN 912 is widely used for metric hexagon socket head cap screws, while ASME B18.3 provides dimensional specifications for inch-series socket screws and related products.

Black and Zinc-Plated Finishes

We offer Black and Zinc-Plated (ZP) finishes to accommodate different application and environmental requirements. The availability of both finishes allows buyers to select the appropriate combination of surface protection, appearance, application environment, and cost.

Designed for Machinery, Automation and Precision Assemblies

The compact geometry and internal hex drive make Allen Head Screws particularly suitable for applications where fastening performance needs to be combined with efficient use of installation space. They are commonly used in machine frames, automation systems, tooling and molds, mechanical components, brackets, fixtures, automotive assemblies, industrial equipment, and precision machinery. For designers and manufacturers, their compact head configuration can help achieve cleaner assemblies and provide greater flexibility when fastener placement is constrained by surrounding components. For maintenance and replacement applications, standardized DIN and ASME specifications also make it easier to select compatible fasteners for existing equipment.

A Flexible Sourcing Solution for Industrial Buyers

For OEM manufacturers, machinery companies, automotive suppliers, equipment builders, fastener distributors, importers, and wholesalers, our Allen Head Screws provide a broad and practical sourcing range. The combination of 1035, 1045, and 40Cr steel, ISO 898-1 grades 4.8/6.8/8.8/10.9, SAE J429 Grade 2/5, DIN 912 and ASME B18.3 standards, M5–M20 and #10–1" sizes, and Black or Zinc-Plated finishes allows customers to select the appropriate specification for different fastening requirements.