Counter Sunk Allen CSK

Description

​Allen CSK screws, also known as countersunk socket head cap screws, are a type of fastener designed to sit flush with or below the surface of the material into which they are installed. This design provides a smooth, unobtrusive finish, making them ideal for applications where a protruding screw head is undesirable.​

Flat head screws are used for flush mounting of sections, usually where one part slides over another or one part is mounted on another. Countersunk head screws, like button heads and low heads, are limited by configuration in their tensile strength capability.  Because of this, they should not be used in applications requiring full strength, where Socket Head Cap Screws should be used.

The head angle for metric countersunk socket screws is 90 degrees up to & including M20 and 60 degrees over M20. The head angle for Imperial is different – Unified is 82 degrees and British thread forms are 90 degrees.

Usage : Machine Guards, Hinges, Covers, multiple level assemblies etc.

Available in Hexagonal socket drive and the improved 6-Lobe (Hexalobular) drive.

Design and Features

The defining characteristic of Allen CSK screws is their countersunk head, which tapers to a flat top. This allows the screw to be driven into a pre-drilled countersunk hole so that the head aligns flush with the material’s surface. The screws feature a hexagonal socket drive, commonly referred to as an Allen drive, which requires an Allen wrench or hex key for installation and removal. This internal drive system provides a secure grip, reducing the risk of cam-out and allowing for higher torque application compared to traditional slotted or Phillips drives.

Materials and Finishes

Allen CSK screws are manufactured from a variety of materials to suit different applications and environments:​

• Stainless Steel: Offers excellent corrosion resistance, making it suitable for applications exposed to moisture or harsh environments.​

• Carbon Steel: Provides high strength and is often used in applications where corrosion is not a primary concern.​

• Alloy Steel: Combines strength and toughness, suitable for high-stress applications.​

To enhance their properties, these screws may undergo surface treatments such as zinc plating, black oxide coating, or passivation. These finishes can improve corrosion resistance, reduce friction, and enhance appearance.

Applications

The flush-fitting nature of Allen CSK screws makes them ideal for applications where a smooth surface is essential:

Machinery and Equipment: Used in assemblies where moving parts pass over the fastened area, preventing interference.​

• Automotive Industry: Employed in vehicle assemblies to provide a sleek appearance and reduce aerodynamic drag.​

• Furniture Manufacturing: Commonly used to attach components where a protruding screw head would be unsightly or obstructive.​

• Electronics: Utilized in enclosures and assemblies where space is limited, and a flush surface is required.

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