M16 Nuts, Bolts & Washers

Take on the heaviest structural projects with confidence using our range of M16 nuts, bolts, and washers. With a substantial 16mm thread diameter, these fasteners are engineered for critical load-bearing applications, such as securing steel columns, anchoring heavy plant machinery to concrete, and framing large-scale timber constructions.

Our M16 selection focuses on high-performance fixing solutions, particularly through bolts which provide rapid and reliable anchoring into masonry and concrete—essential for installing structural base plates and heavy-duty racking. We also supply the necessary components to ensure a secure assembly that resists vibration and stress. Manufactured by trusted brands like FandF and Fischer, and available in durable zinc-plated finishes for corrosion resistance, our M16 range ensures your heaviest fixtures stay put.

Frequently Asked Questions | FAQ

What size spanner do I need for an M16 nut?

A standard M16 hexagon nut or bolt head requires a 24mm spanner or socket. Ensure you have a long-handled wrench or breaker bar, as M16 fixings often require significant torque to tighten.

What size hole should I drill for an M16 through bolt?

Unlike standard bolts which need a clearance hole, an M16 through bolt is designed to fit into a hole the same size as the bolt shank. You should drill a 16mm hole into the masonry substrate to ensure the expansion clip bites correctly.

What is the difference between M16 and M12 bolts?

The "M" number refers to the outer diameter of the thread in millimeters. An M16 bolt (16mm) is thicker and significantly stronger than an M12 bolt (12mm), making it suitable for much heavier loads and critical structural connections.