50mm x 7mm Mag Nails Box of 100

Magnetised hardened steel nails designed for fast recovery with a metal detector. Featuring a large centre point for precise instrument seating and a corrosion-resistant zinc coating, these durable fixings are the professional choice for groundworkers and surveyors marking tarmac or concrete.

High-Strength Magnetism: Infused with powerful magnetic properties, making them easy to locate with a metal detector even when buried under soil or pavement.

Corrosion Resistant: Finished with a specialised zinc coating to prevent rust and maintain structural integrity during long-term outdoor exposure.

Large Impact Head: Designed with a heavy-duty, flat head and a clear center point for accurate prism placement and strike-proof installation.

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FAQs

What makes these “Magnetic” nails better than cheaper survey nails?

Standard nails are often difficult to find once they are covered by a thin layer of dirt or road debris. Our magnetic nails are made with a specific metal formula that is much easier for a metal detector to find from a greater distance. This eliminates the frustration and downtime of searching for lost points on-site.

How do these compare to Hilti survey nails?

While Hilti nails are excellent for high-velocity driving into concrete, our magnetic nails are the preferred choice for long-term recovery. The magnetised steel means you can find these nails even if they have been tarmacked over or buried, a feature standard Hilti-style nails do not offer.

What quantities are these nails sold in?

All sizes, from the compact 25mm x 5mm to the heavy-duty 64mm x 7mm, are supplied in professional boxes of 100.

Are they a direct replacement for P-K nails?

Yes. These nails are a high-quality, modern replacement for the now-discontinued P-K survey nails, offering even greater strength and magnetic detectability for civil engineering contractors.

Which size should I use for tarmac?

For most road surfaces, the 32mm x 6mm or 38mm x 7mm sizes are the most popular. If you are working on softer asphalt or require more holding power, the 50mm and 64mm lengths provide extra security.

Will the heads break off during installation?

No. These nails are specially tempered for elasticity, which prevents the head from snapping off even when struck with a heavy club hammer in cold conditions. This is a common failure point in inferior, brittle masonry nails.

Are they resistant to site chemicals and salt?

Yes. The zinc and chromate coating is designed to resist corrosion from road salt and moisture, ensuring your benchmarks remain intact and visible throughout the project lifecycle.

What is the purpose of the large centre point?

The oversized indent in the head is specifically designed to seat a prism pole or a 5-8″ adapter perfectly. This prevents slip during measurement, ensuring surveying companies maintain the highest possible accuracy.

Do I need to pre-drill into high-strength concrete?

For extremely hard or aged concrete, we recommend pre-drilling a small pilot hole. This ensures the nail seats perfectly without spalling the surrounding surface, maintaining the integrity of the control point.

Can I use these with survey washers?

Absolutely. These nails are designed to work perfectly with standard steel or coloured survey washers, which can be used to increase visibility or colour-code different utility and site boundaries.