The components behind the perimeter.

Steel palisade is the vertical-pale perimeter of UK and Irish industrial estates, utility compounds and rail boundaries, and it is widely used in Australia, New Zealand and southern Africa. Buyers specify it under BS 1722-12 in GP (general purpose) and SP (security) grades, choosing the height, the pale profile (D or W section), the pale thickness and the top style. Thicker pales and taller bays go where the site calls for higher security.

Palisade Fence covers the pales, angle rails, RSJ posts and fish plates, supplied as bays or kits. Machine Bolts, including cup square and T-head versions, join the rails to the posts through the fish plates, and Carriage Bolts with shear nuts fix each pale to the rails so the fixings cannot be undone from outside. Everything is hot dip galvanized or powder coated over the galvanizing, to the grade and dimensions the buyer specifies.

Chain-link is the standard commercial and industrial fence in North America, and the same framework appears as chainwire in Australia and simple-torsion mesh in Europe. Woven diamond mesh hangs on round steel posts and a top rail: line posts carry it along the run, while terminal posts at the ends, corners and gates take the full pull of the stretched fabric. Buyers specify the parts by the post and rail sizes of their framework, often to ASTM F626 fitting sizes.

The Tension Bar threads through the last row of mesh and is clamped to each terminal post with tension bands and Carriage Bolts, so the fabric can be pulled tight. The Truss Rod runs diagonally from the brace rail back to the terminal post and, with a truss tightener, keeps that post from leaning under the fabric's pull. Fence Fittings supply the bands, rail ends, loop caps, dome caps and sleeves that hold the rails and posts together; the fabric and pipe come from the fence contractor.

A security topping adds strands of barbed wire above an existing chain-link or mesh fence, angled outward or held upright, so the fence is harder to climb. Arms carry three strands on a 45-degree or vertical arm, or six strands on a V arm, and are chosen by the size of the post they sit on. The topping goes on over the base fence, so a site can raise its security without replacing the fence below.

Barbed Wire Arm is the pressed-steel arm with a collar that fits over the post top; on line posts the top rail passes through it. Corona makes arms for 1-5/8 to 2-1/2 inch posts, and flat barbed wire stays for angle posts in metric markets. Fence Fittings add the ties and bands that hold the wire at each arm, and Carriage Bolts fix arms where they bolt to the post.

Double gates on chain-link and farm fences need one leaf held firmly while the other opens. A drop rod on the fixed leaf, called a drop bolt or cane bolt in the UK and Australia, slides down through guides into a ground stop and pins that leaf in place. A fork latch then joins the two leaves, and the hinges on the gate posts carry the weight.

Gate Drop Rod is the L-bend rod in 1/2 or 5/8 inch drawn rounds, with 5/16 inch gate rods alongside, sized to the gate frame. Fence Fittings supply the hinges, fork latches and drop rod guides. Carriage Bolts fix the guides and hinges to the frame, and Machine Bolts hold brackets on the gate posts.

Pasture, ranch and rural boundary fences in North America, Australia and New Zealand run barbed, woven or high-tensile wire along lines of driven steel posts, with strainer posts at the ends and corners taking the tension. Steel posts go in quickly with a hand or power driver and need no concrete, which is why they are used for long runs. The wire is fixed from the bottom strand up and tensioned against the strainers.

Fence Post is a studded T-post formed from 2.0 mm (14 G) steel strip, with 2.3 and 2.5 mm available, and an anchor plate that sets the post firmly in the ground. The studs along its face hold the wire clips at each strand. Fence Fittings supply the clips and ties; the wire, strainer posts and tools come from the fence contractor. Y-post and star picket profiles are made to order for Australian and New Zealand fencing.