Hook bolt ALPAR S3021 M20 L-200 galvanised—threaded hook bolt, corrosion‑resistant

ALPAR S3021 M20 L-200 is a galvanised threaded hook bolt designed for secure anchoring and load fastening in construction and outdoor installations. The bolt features an M20 metric thread and an overall length of 200 mm, finished with a zinc coating that improves corrosion resistance for exterior use. Its hook-shaped end allows attachment to cables, chains, or structural elements, and the threaded section is compatible with standard M20 nuts and plates for straightforward mechanical fastening.

Advantages

The galvanised surface provides protection against rust and weathering, extending service life in exposed conditions. The standard M20 threading enables compatibility with a wide range of nuts, washers and mounting plates, simplifying installation and replacement. The hook profile offers a reliable anchor point for suspending loads or connecting to other components, while the 200 mm length gives sufficient engagement depth for many fastening situations.

Suitable for

• General construction anchoring and temporary formwork fixtures
• Fencing posts, gates and outdoor barrier installation
• Mounting of signs, lighting fixtures and cable supports
• Suspending chains, ropes or light equipment from structural members

When it may not be suitable

This galvanised hook bolt is intended for mechanical fastening where a hook end is required; it is not designed as a permanent load-bearing solution for critical structural applications without verifying load ratings and compliance with local building codes. For highly corrosive environments (for example, direct saltwater exposure or chemical atmospheres) stainless steel or specially coated fasteners may be more appropriate.

Key specifications

• Thread size: M20 (metric)
• Overall length: 200 mm
• Material finish: zinc galvanised coating for corrosion resistance
• Head type: hook-shaped end
• Suitable fastening method: used with compatible nuts, washers and plates or welded fixtures

How to use

Select a matching M20 nut and appropriate washer or plate for the installation. Drill or prepare the mounting material to accept the bolt if required, then insert the threaded portion through the fixture and secure with an M20 nut tightened to the torque recommended for the chosen materials. Use appropriate washers to distribute load and prevent thread damage. The hooked end can be used to suspend chains, ropes or to latch onto compatible anchor points. Periodically inspect the galvanised coating and connections for signs of wear or corrosion, especially in outdoor installations.

What to consider before purchase

• Confirm that M20 threading and 200 mm length meet the engagement and load requirements for your application
• Assess environmental exposure to determine whether galvanised finish is sufficient or stainless/specially coated fasteners are required
• Verify compatibility with the nuts, washers and plates you plan to use
• Check load capacity and local regulations if used in structural or safety-critical installations

Usage recommendations

For reliable performance, tighten the M20 nut to the appropriate torque for the materials in use, use flat or spring washers where needed to maintain clamp force, and inspect connections periodically. Replace any bolt showing deep corrosion, thread damage or deformation to maintain safety and functionality.