Long through-bolts: the hardware solution for thick door handles

When standard screw length is not enough…

Door handles are generally supplied with standard through-bolts suited to doors of average thickness (35 to 45 mm). However, some installations require more robust fixing: entrance doors, security doors, insulated doors or doors with decorative cladding. In these cases, the original screw becomes too short to pass through the entire thickness of the door leaf.

That is where long through-bolts come in: they guarantee a solid anchor, perfect alignment of the lever handles and increased durability of the mechanism.

Why choose a long through-bolt?

A long through-bolt is an assembly screw whose threaded shank is designed to pass through the entire thickness of a door, panel or set of trim in order to secure two elements together — for example, the two lever handles of a door handle set.

Unlike a standard unilateral fixing screw, the through-bolt ensures direct axial clamping between the two faces of the support. It passes through the door leaf from side to side and screws into a nut, a threaded bush, or the opposite plate of the handle.

Long through-bolts are distinguished by:

  * a length greater than the standard (often between 60 and 120 mm depending on the door thickness),

   * a regular metric thread, ensuring precise alignment of the handles,

   * a countersunk or cylindrical head for a flush-fitting installation,

  * manufacture in galvanised steel, stainless steel (A2 or A4) or brass, ensuring corrosion resistance and long-term mechanical stability.

They are essential for thick doors, armoured entrance doors, fire doors or insulated doors whose structure exceeds the dimensions provided for by standard screws.

A matter of precision engineering

For a design door handle, every component matters: centre distance, return spring, spindle and of course the fixings.

Long through-bolts in stainless steel, chrome-plated brass or nickel-plated zinc allow the handle to be tightened through the full thickness of the door without difficulty.

 Result: no deformation, no play in the double lever handle and perfect retention of the locking system.

Certain versions are available in lengths from 80 to 120 mm, suited to very thick or armoured doors.

 Milla Poignées: the screws and hardware suited to every door

At Milla Poignées, all handle sets are supplied with the complete fixings:

  * Through-threaded rod in various lengths (10 to 12 cm)

  * Escutcheons and roses suited to the door drilling,

  * Threaded screws, pins and spacers if necessary,

  * Decorative fixings matched to the finishes (chrome, matt black, satin stainless steel, white lacquered, gold).

Our fixing screws are tested on many different handle models: cylindrical, tubular, contemporary or rustic designs. The correct tightening torque is essential to prevent any play over time. We also offer locking washers, cap nuts and end fittings compatible with all types of decorative hardware.

For DIY enthusiasts and installers, there is no need to look elsewhere: Milla Poignées offers you a wide range of screws, nuts, bolts and fixing accessories ready to use, perfectly suited to your hinged doors, sliding doors or French windows. A complete assortment for screwing, crimping, welding or mounting your handles and ironmongery with precision, whatever the type of material — from wood to galvanised sheet metal.

Whether your project involves a design entrance door, an interior sliding door, or a rustic wooden door, you benefit from a complete and reliable mounting kit, ready to fit with a simple screwdriver. We ensure compatibility with all wooden, steel, glass or aluminium doors, for solid assemblies and smooth operation over time.

Long through-bolts are the indispensable technical solution for a lasting and precise installation of handles on thick doors.

By choosing Milla Poignées, you benefit from a comprehensive service: design handles, handle screws suited to all door types and decorative hardware of European origin.

No unpleasant surprises, no parts to buy elsewhere: everything is provided, down to the last millimetre, for an easy and lasting installation!