Patch Fitting Specifications That Decide Fit And Durability

A patch fitting is a compact hardware piece that clamps onto the edge of a frameless glass door. It carries the connection points a glass door needs — the bottom point that works with a floor spring, the top point that meets the frame or an L patch fitting, the lock, and the fitting that joins the door to a fixed glass wall. Because the patch fitting sits at the structural corner of the glass, the numbers on its specification sheet decide whether it fits the project and how long it stays tight.

Specification sheets are short documents, but the values on them are not interchangeable. A patch fitting built for one glass thickness will not take another, and a cover plate or core dimension that looks minor on paper is what keeps the glass square in a door that opens repeatedly through the day. This article works through the specification lines that matter before a bulk order goes into production.

Glass Thickness — 8–12 mm Toughened Glass

The glass thickness a fitting accepts is the first line to check, so it is better to confirm it before the order is placed. Jianlai patch fittings are built for 8–12 mm toughened glass, and that range is the window the data sheet works inside.

A project's glass thickness is set by the glazing design, not by the hardware. If the glass specified for the door is outside 8–12 mm, the patch fitting does not take it with a thicker gasket or a shim — it is a different product. Confirm the glass thickness on the glazing schedule before the order, and put that number on the purchase order next to the patch fitting model. A mismatch found after the glass is cut and drilled means reworked glass, not a quick adjustment.

Cover Plate — Stainless Steel, 0.8 / 1.0 / 1.2 / 1.5 mm

On a patch fitting, the cover plate is the face that stays visible after installation. It is stainless steel, and the thickness is offered across four steps: 0.8, 1.0, 1.2 and 1.5 mm.

The thickness is not only a cosmetic choice. A thicker plate resists the flex a high-traffic door puts through its corners, and it sits flatter against the glass on a wide or heavy leaf. The 0.8 mm and 1.0 mm plates suit calmer interior doors; the 1.2 mm and 1.5 mm plates are the choices where the door sees constant use. On a bulk order, holding one plate thickness across the project avoids tone and flatness differences between doors that were meant to match.

Core — Aluminum Alloy, 7.5 / 8.0 / 9.0 mm

Behind the stainless cover plate of the patch fitting sits the core, an aluminum alloy body. The cover plate is the visible, corrosion-resistant face; the core is the part specified for its substance — offered at 7.5, 8.0 and 9.0 mm because a thicker core gives the fitting more body behind the glass and more resistance to the twist a wide or heavy leaf places on its corners.

Where the door is larger or sees heavier use, the 9.0 mm core is the choice to specify. Smaller, lighter leaves are served by the 7.5 mm and 8.0 mm cores. On the patch fitting, the core and the cover plate are specified together, and both belong on the data sheet beside the glass thickness. A fitting where one of the two is wrong still fails the door, so the order should name both — cover plate thickness and core thickness — not only the finish.

Finish — Satin / Polish / Gold / Matte Black

A patch fitting is available in four finishes, and the right one is set by where the door sits and what the rest of the fit-out does.

Satin — a fine directional grain with low reflectivity. It reads as a quiet architectural surface and does not show the contact marks that daily use leaves, which is why it turns up on busy commercial entrances.

Polish — a high-reflectivity surface with a bright, crisp appearance. The smooth face wipes down quickly during routine cleaning, and it coordinates with polished pull handles in the same scheme.

Gold — a warm tone used as a deliberate accent. It pairs with bronze or brass door furniture elsewhere in the fit-out, on projects where the fitting is meant to be a visible detail.

Matte black — a uniform, non-reflective dark surface. It sits quietly against stone, tile or dark metal, so the door reads as one clear plane.

Two things are worth confirming on the order. First, that the finish matches the adjacent hardware — pull handles, locks and any other fittings on the door — because a satin cover next to a polished one reads as a mistake from across a lobby. Second, that the whole batch comes from one production run, since two runs can differ slightly in tone.

Commercial Terms to Put on the Purchase Order

Four commercial items belong in the written order:

• Warranty — 3 years across the patch fitting range

• MOQ — 100 pcs per order

• Lead time — around 7 days for a sample, around 30 days for bulk production

• OEM / ODM — supported, including custom logo, finishes and packaging

Applications for the patch fittings span office buildings, residential apartments, stores and hotels, so the same specification lines serve both a single shopfront and a multi-floor commercial fit-out. On larger programmes, ask whether the order can be split into deliveries matched to the installation schedule, which keeps hardware off a site that is not ready for it.

Specification Summary

Keep the completed specification lines with the order file. It turns a fitting conversation into something the project team can refer back to when the first delivery arrives.

Conclusion

Four specification dimensions, each one a written confirmation rather than a verbal one: glass thickness against the glazing schedule, stainless cover plate thickness, aluminum core thickness, and finish against the adjacent hardware — plus the commercial terms on the order. A patch fitting order goes wrong at the specification stage, and that is also where it costs less to put right.

Jianlai supplies patch fittings with OEM and ODM support and a 3-year warranty, built for 8–12 mm toughened glass with stainless cover plates and aluminum cores. Send us your glazing schedule and quantities, and we will confirm the plate and core specification that fits your doors. Start from the patch fitting range or talk to our team.