Concrete Bolts & Screws

The Right Concrete Bolt Diameter for Every Application

Choosing the correct diameter is just as important as choosing the correct length. When selecting concrete fixing bolts. The right size depends on the base material. The item being fixed and the product specification.

We covers popular fixing sizes from 6mm to 16mm. You can compare concrete screws, masonry screws. And bolt options for concrete, brick, block and other suitable masonry materials.

Whether you are a builder, installer, tradesperson or working on a home project. Start with the surface you are fixing into. Then choose the diameter, length, head type and finish that suit the job.

Concrete Bolts & Screws by Diameter

Our concrete fixing bolts come in several thread diameters. Each size below links to a product from the relevant size range.

Choosing the Correct Concrete Bolt Diameter

Start with the material you are fixing into. Then check the bolt diameter, overall length, drill hole size and required fixing depth.

For lighter fixing work, a smaller diameter may suit the product and substrate. Larger anchor concrete bolts are also available. Where the product specification calls for them.

Do not choose a fixing by diameter alone. The correct choice should match the base material. The technical data supplied for the exact product.

If you are searching for a bolt anchor concrete fixing, the same rule applies. Check the substrate first, then compare the fixing type, size and installation details.

Need more help choosing? Read our guide to common mistakes when choosing concrete bolts and anchors .

Head Types and Drive Formats

Our concrete bolts and screws come with several head profiles. We offer Countersunk, Flat Countersunk with Ribs, Hex, Hex Flange, and Pan Head options.

The right head depends on the fitting, the finished surface and the tool you plan to use. Compare the main head styles below before choosing.

Countersunk

A lower-profile head for applications where the fixing needs to sit closer to the surface.

Flat Countersunk with Ribs

This head type appears across the concrete screw range and gives a neat, low-profile finish.

Hex

Hex heads give clear access for a suitable socket or driver during installation.

Hex Flange

A hex head with an integrated flange that gives a wider bearing area below the head.

Pan Head

Pan heads stay raised above the fixing surface and suit jobs where a flush finish is not needed.

Head type should not be chosen on appearance alone. Check the fitting method, product dimensions and tool requirements before installation.

Coatings, Materials and Corrosion Resistance

The correct material and finish depend on the fixing environment. Includes Carbon Steel products as well as Plastic accessories. With several finishes across the range.

Current finish options include Exterior Silver Organic, Gloss, Zinc, Zinc & Clear Cr3 and Zinc & Yellow. Always check the individual product details because the finish varies between products.

If your project specifically requires stainless steel concrete bolts. Confirm the material on the exact product page before ordering. A silver finish does not automatically mean the fixing is stainless steel.

For damp, external or exposed work, check the stated corrosion protection before choosing. The environment should guide your choice of material and coating.

Trade Stocked, Next-Day Delivered

JALFT supplies concrete fixing bolts, concrete screws. And masonry screws for builders, installers, tradespeople and DIY users across the UK.

The range covers thread diameters from 6mm to 16mm. With several head styles, lengths and finishes available. This makes it easier to compare the right fixing for your project in one collection.

JALFT advertises next-day delivery for qualifying orders placed by 2pm. Trade account sign-up is also available for regular buyers.

Concrete Bolts & Screws FAQs