Hardware & Fasteners

What is in the tree and what each group does

This tree covers four jobs: fixing one thing to another (screws, nails, nuts and bolts, wall plugs), gathering or tensioning something (clamps, cable ties, rope, turnbuckles), letting something move (hinges, castors, sliding bolts) and closing something (locks, cylinders, door handles, door closers).

Screw, nail or bolt?

All three join, but they differ in how removable they are and in the load they hold. A screw cuts its own thread into the material; it can be undone and refitted, and it holds far more in withdrawal than a nail does. A nail splits its way in, is fast, and performs well in shear; for formwork, pallets and rough carpentry it is still the cheapest fixing there is.

A bolt cuts no thread at all: it passes through a clearance hole and is tightened against a nut on the far side. Metal joints that must come apart again, that vibrate, or that carry serious load are therefore bolted.

• Screw: removable, high withdrawal strength, the standard in wood and sheet.
• Nail: fast and cheap, good in shear, hard to remove.
• Bolt: a removable metal joint, tightened to a controlled torque.
• Wall plug: what carries the load in masonry, where none of the above holds alone.

The substrate picks the plug, not the product

The first question in plug selection is not the load but the substrate: solid brick, hollow brick, aerated concrete, dense concrete and plasterboard each want a different plug. A plain plastic plug set into hollow brick spins in the void and holds nothing; a standard plug in aerated concrete simply crumbles the material.

The second question is the hole diameter: plug diameter and drill bit diameter must match. A 10 mm plug goes into a hole drilled with a 10 mm bit; in a hole drilled at 12 mm it sits loose.

Coating: how long it lasts, and where

What usually ends a fastener's life is not its steel but its coating. Indoors, white zinc plating is enough; outdoors a screw that gets wet will rust within a season on the same plating. On the coast and in permanently wet service, everything except stainless steel eventually loses.

How door and lock hardware is measured

Two dimensions decide everything in door hardware: the lock's centre distance (from the handle spindle to the centre of the cylinder, most often 85 mm) and the cylinder length. Cylinder length follows the door leaf thickness — the bulk of the catalogue is 68, 76, 83 and 90 mm — and it must not protrude more than 3 mm on either face; a proud cylinder can be gripped and snapped.

The lock type follows the door itself: a mortise lock for wooden and PVC interior doors, a cylinder mortise lock for apartment entrance doors, a multi-point system for steel doors, and a surface-mounted rim lock where no mortise pocket can be cut into a metal door.

Supply from Seza Global

In hardware and fasteners we supply brands such as Kale, Yuma, YMK, Akdeniz, Meridyen, Erbi, Tork, İnan, Burgaz, Kama, İpsan and Özkul at wholesale. From screws and nails to wall plugs, from clamps and rope to locks, cylinders and door hardware, the catalogue holds over 1,100 sizes across 26 subgroups.

This group works from a size list: send the diameter-length, metric thread, band range or cylinder length list with quantities and we return stock, price and lead time in one reply. Export shipments are documented in full.