Description

APL – Allen Bolt CSK – M4x40 mm – Stainless Steel | Countersunk Hex Socket Machine Screw

The APL Allen Bolt CSK – M4x40 mm – SS is a precision-engineered, countersunk head bolt with an internal hex socket drive, designed for flush-mount applications requiring strength, corrosion resistance, and a clean finish. Constructed from high-quality stainless steel, this fastener is ideal for industrial, mechanical, furniture, and architectural use—where performance and aesthetics go hand in hand.

With a 4 mm thread diameter and a 40 mm length, this bolt is part of APL’s trusted line of metric fasteners built to deliver secure, vibration-resistant connections in a wide range of applications.

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Understanding Countersunk Allen Bolts (CSK)

CSK (Countersunk) bolts have a flat, conical head that sits flush or below the surface of the assembled part, creating a smooth and streamlined finish. This is particularly useful in assemblies where protruding heads would interfere with function or appearance—such as panel assemblies, precision equipment, and flat surfaces.

The hex socket (Allen) drive provides excellent torque transfer and reduces the risk of stripping, making this bolt easy to install and remove using a standard Allen key or hex wrench.

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Material: Stainless Steel (SS)

This bolt is made from high-grade stainless steel, offering:

• Corrosion resistance in humid, marine, or chemical environments

• Strength and durability under load or vibration

• Long life with minimal maintenance

Stainless steel makes this bolt suitable for both indoor and outdoor use in demanding environments such as industrial machinery, structural fixtures, and precision assemblies.

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Dimensions and Technical Details

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Key Features:

• Flush Finish Design: The countersunk head fits perfectly into pre-machined conical holes, offering a flat surface after installation.

• Hex Socket Drive: Allows secure tightening using an Allen key—minimizes slippage and damage during installation.

• Full Thread Body: Maximizes grip and load-bearing surface across the entire shaft length.

• Corrosion Resistance: Stainless steel ensures rust-free performance even in moisture-prone or outdoor settings.

• Versatile Fit: Standard M4 thread size compatible with a wide range of nuts, inserts, and threaded holes.

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Applications:

• Mechanical Assemblies: Fastening of covers, brackets, panels, and moving parts

• Furniture Construction: Modern fittings where flush installation and clean design matter

• Electronics Enclosures: Mounting of PCBs, back panels, and access covers

• Automotive & Machinery: Dashboards, metal sheets, and vibration-sensitive parts

• Architectural Fixtures: Stainless steel fittings in kitchens, staircases, or public furniture

• DIY Projects: Ideal for makers and tinkerers building sturdy and polished assemblies

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Installation Tips:

• Use a 2.5 mm or 3 mm Allen key (check actual drive size) for tightening.

• For flush mounting, drill a countersunk hole that matches the bolt head angle (typically 90°).

• Do not overtighten—especially in soft materials like plastic, MDF, or aluminum.

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Why Choose APL Fasteners?

APL (Accurate Products Ltd) is a recognized manufacturer of high-quality fasteners used in engineering, construction, electronics, and manufacturing. APL bolts are manufactured with exacting tolerances and undergo rigorous quality checks to ensure uniform performance, durability, and compatibility with industry standards.

Whether you’re working on a large industrial setup or a DIY mechanical project, APL fasteners ensure reliability, safety, and ease of installation every time.

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Available Packaging Options:

• Sold in packs of 100 pieces

• Custom packaging available for bulk or project orders

 

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