Allen head CSK Machine Screw

The Allen head countersunk (CSK) machine screw is a highly versatile fastener known for its flush mounting capabilities, strength, and clean aesthetic. It features a flat, cone-shaped head that sinks into the surface for a smooth finish, which helps avoid snagging and provides a professional appearance. The Allen head (hex socket) drive allows for secure tightening with reduced risk of slippage and damage compared to traditional slotted drives, making it highly reliable for precision applications.

Key Benefits

         Provides a flush, snag-free finish ideal for applications requiring smooth surfaces.

         Secure tightening with Allen key reduces tool slippage and head stripping.

         Strong hold with moderate tensile strength suitable for general fastening.

         Versatile sizes and materials (stainless steel variants like SS 304 and SS 316) offer excellent corrosion resistance.

         Suitable for use in restricted or narrow spaces thanks to Allen key drive.

         Available in various finishes including black on request for aesthetics and corrosion protection.

Typical Applications

         Machine building and assembly where flush surfaces are needed.

         Protective covers, machine guards, and hinges that require a low-profile fastener.

         Furniture and cabinetry for neat finishes.

         Electrical and electronics equipment assembly.

         Marine, chemical, and corrosive environments (especially with stainless steel grades).

         Architectural and structural components.

         General industrial and domestic use requiring durable and corrosion-resistant fasteners.

Usage Details

         Requires a countersunk hole in the mating surface to achieve flush mounting.

         Tightened using an Allen key, which fits inside the hexagonal recess of the screw head.

         Common in multi-level assemblies where parts slide over or mount onto one another without protrusions.

         Not recommended for applications needing full tensile strength where socket head cap screws are preferred.

Other Well-Known Name for Same Product

         Allen head countersunk machine screw

         Allen CSK machine screw

         Countersunk Allen head screw stainless steel

         Flush mount Allen screw

         Hex socket countersunk screw

         DIN 7991 Allen screw

         Stainless steel Allen CSK bolt

         Precision Allen machine screw

Size Table (Common Metric Examples)

The head angle for metric CSK screws is typically 90 degrees for sizes up to M20, providing a standardized fit when countersinking holes in materials.

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