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Imperial Slotted Raised Countersunk Screws.

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Imperial Slotted Raised Countersunk Screws

What are Imperial Slotted Raised Countersunk Screws?

Imperial Slotted Raised Countersunk Screws are specialised fasteners used within a variety of precision engineering disciplines. The circumference of the raised countersunk head feature is engineered to sit flush with the surface material once installed, offering an aerodynamic profile and a clean aesthetic. The slotted drive, compatible with standard flathead screwdrivers, provides straightforward torque control. The 'Imperial' nomenclature indicates the screw dimensions are denoted using the imperial unit system, which includes inches and fractions of an inch which is popular in automotive and aerospace engineering projects. 

How Imperial Slotted Raised Countersunk Screws Work.

These screws operate by engaging with a corresponding Imperial thread - typically within a nut or pre-tapped hole. The unique attribute of a raised countersunk head allows the screw to sit flush with the surface, eliminating potential snag points and maintaining the integrity of the design line. The slotted drive design facilitates accurate torque application, crucial in precision applications where over-tightening can compromise material integrity or under-tightening may result in insufficient joint strength.

What Material Imperial Slotted Raised Countersunk Screws are Made From.

Accu's Imperial Slotted Raised Countersunk Screws are exclusively constructed from high-quality A2 Stainless Steel. This particular grade of stainless steel, also known as type 304 or 18/8, is renowned for its excellent corrosion resistance and durability. A2 stainless steel is a top choice for a vast range of applications due to its ability to resist rust, maintain structural integrity under various environmental conditions, and uphold an impressive strength-to-weight ratio. Therefore, these screws are perfectly engineered to provide the utmost in strength, longevity, and reliability for any precision engineering requirement.

What Size and Type Imperial Slotted Raised Countersunk Screws are Available.

We provide a comprehensive range of sizes, from the small 1/4-20 for precision applications requiring compact fastening solutions, up to larger sizes such as 10-32 UNC, intended for robust assemblies that necessitate superior load-bearing. The extensive range includes a variety of materials and finishes for customised application requirements. We also provide additional services like AccuBlack for a sleek, non-reflective black finish and thread-locking variants to prevent loosening in high-vibration environments.

For assemblies requiring superior locking capabilities, consider our Imperial Nylon Insert Nuts or Imperial Serrated Flange Nuts, which can complement the use of our Imperial Slotted Raised Countersunk Screws.


Q: Why would I choose Imperial Slotted Raised Countersunk Screws over other types?.

A: These screws offer unique advantages, such as an unobtrusive finish due to their raised countersunk head, ensuring a flush fit. The slotted drive allows precise torque control, which is crucial in avoiding material damage due to over-tightening. As an alternative, Accu also stocks a Phillips drive variant.

Q: Are these screws suitable for high-corrosion environments?.

A: Certainly. When crafted from corrosion-resistant materials like Stainless Steel, these screws can withstand challenging environments, including exposure to chemicals or outdoor elements.

Q: Which screwdriver do I need to install these screws?.

A: These screws are compatible with standard flathead screwdrivers, the size of which should correspond to the size of the screw's slot for optimum torque application.

Q: How can I select the right screw size for my task?.

A: The correct screw size should be determined by your application requirements. Consider factors such as the material thickness, the load the screw will bear, and the dimensions of pre-drilled holes, threads or nuts.

Q: Is there a minimum purchase quantity for these screws?.

A: At Accu, we understand the diverse needs of our clients. Therefore, we offer the flexibility to order from a single piece to large-scale quantities.

Bespoke Imperial Slotted Raised Countersunk Screws Manufacture.

High precision, bespoke manufacture of Imperial Slotted Raised Countersunk Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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