ToppBolt – Female Concrete Screw in Inch Sizes

Direct-fastening concrete screw with a female head in inch sizes — carrying the American ESR-4376 approval for cracked and uncracked concrete and for seismic loads.

ESR-4376 approvalCracked & uncracked concreteSeismic A-FInch sizes

The Adit concrete screw family

Choose the right concrete screw for your head type, corrosion environment and approval requirements.

Technical specification

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What is the ToppBolt?

The ToppBolt is a direct-fastening female concrete screw in inch sizes. Like the rest of the concrete screw family, it cuts its own thread straight into the walls of the drilled hole and forms a mechanical lock — with no plug and no chemical resin.

The key difference: the ToppBolt carries the American ESR approval (ESR-4376) rather than a European ETA, and it comes in inch sizes. It is the solution when the project specification or the equipment on site is built to American standards.

When to choose the ToppBolt

• American specification: when the project is designed to American standards and an ESR approval is required rather than an ETA.
• Inch sizes: when the equipment, hangers or threaded rods on site are imperial rather than metric.
• Female head: the suspended element threads into the head and is installed after the anchor — and can be replaced without touching the anchorage.
• Seismic loads: approved for seismic categories A-F.

Need a female head in metric sizes? See the TFF female-head concrete screw, which carries the European ETA1 and ETA6 approvals.

Frequently asked questions