When you order sliding windows from a Chinese factory, the single most useful document you can ask for is a hardware schedule. It lists every moving and locking component in the system — the rollers, tracks, handles, locks, and seals — and tells you exactly what you are getting before a single profile is cut.
A clear hardware schedule does more than keep your project organized. It is your best defense against the two problems that plague imported windows: hardware that fails after a few seasons, and a finished product that does not match the sample you approved. This guide explains what belongs in a sliding window hardware schedule, how each component affects performance, and what to check when you are sourcing from China.
A hardware schedule is a specification document that itemizes every hardware component used in a window system. For a sliding window, it typically covers:
Think of it as the bill of materials for everything that moves, locks, or seals. When a manufacturer provides a hardware schedule, you can compare components across suppliers, verify that the hardware matches your project requirements, and hold the factory accountable during inspection.
Rollers are the most performance-critical part of a sliding window. They carry the full weight of the sash and must glide smoothly for the life of the window. When you review a hardware schedule, check three things: load capacity, wheel material, and bearing quality.
A good schedule states the load rating explicitly. For example, the TS130 side-press window from ALPES uses 200 kg load-bearing pulleys, while the SL155 thermal break sliding door runs a 20-wheel self-balancing system rated to 400 kg. If the schedule does not state a load rating, ask for one — undersized rollers are the most common cause of sagging sashes and stiff operation.
Wheel material matters too. Rubber-coated or polymer wheels run quieter than bare metal and tolerate minor track irregularities. Nylon and stainless steel rollers are common in premium systems.
The track guides the sash and provides the bearing surface for the rollers. Track geometry must match the roller profile precisely, or the sash will wobble and wear unevenly. Look for tracks with smooth, corrosion-resistant surfaces and proper drainage. High-quality systems, like the SL112/167 sliding door from ALPES, use a 45 mm high-ｄｒｏｐ bottom track for instant drainage, with an optional 85 mm water barrier for exposed locations.
Sliding window handles come in two main styles: recessed flush-pull handles and external lever handles. Recessed handles sit flush with the sash face, which looks cleaner and keeps the handle out of the way when panels overlap — often the only practical option when a fly screen is fitted. External handles are easier to grip but need more clearance.
Premium handles are worth the upgrade. CMECH, one of ALPES's hardware partners, makes the S Metro handle that won the German Red Dot Design Award and is tested to 25,000 operating cycles, with a built-in child safety lock and a self-adjusting hook that compensates for profile tolerances.
The hook lock is the primary security component. When engaged, a hook extends from the sash into a keeper plate in the frame or adjacent sash. The geometry of the hook and keeper determines how much force is needed to pry the sash open — the key measure of anti-pry resistance.
For real security, look for multi-point locking. The TS130 uses an eight-point locking system, and the SL126/182 sliding door uses multi-point locks with stainless steel locks in precision-cast reinforced casings. Anti-lift blocks and anti-pry lock points, such as the ROTO transmission boxes used by ALPES, add another layer of protection.
A sliding window is only as weatherproof as its seals. Continuous four-sided sealing strips, corner-welded gaskets, and sealant between the top track and frame all prevent water and air infiltration. The SL126/182 from ALPES uses a true full-seal design with continuous four-side sealing strips, and the SL155 uses a four-sealing design for all-weather waterproofing and sound insulation.
Hardware that starts noisy rarely improves with use. Rubber-coated rollers on a properly aligned track produce almost no sound; metal-on-metal contact, worn wheels, or a misaligned track generate noise that worsens over time. A good hardware schedule tells you what the rollers are made of and how they were tested.
How tightly the sash is pulled against the frame seals when locked determines weather resistance. A hook lock with a self-adjusting hook maintains consistent seal compression even as the frame expands and contracts with temperature changes. This is why premium systems use adjustable hooks and multi-chamber thermal break profiles.
Security comes from lock geometry and anti-lift provisions. A locking hook rated to a documented pull-out force, combined with anti-lift blocks, provides meaningful resistance to forced entry. For high-end projects, look for hardware tested to international standards — the AW90 passive window from ALPES, for example, passes a 240-hour salt spray corrosion test and 5,000 N shear resistance.
The easiest way to avoid hardware surprises is to work with a supplier that treats hardware as part of the engineering, not an afterthought. ALPES, a China-based aluminium sliding window manufacturer and aluminum sliding window supplier, builds its sliding windows and doors around a documented hardware package: German ROTO side-pressure systems, Winkhaus and Wehag hardware, CMECH award-winning handles, 200 kg to 400 kg load-bearing pulleys, and eight-point locking on the TS130 side-press window.
Because ALPES manufactures in a 100,000 m² facility in Foshan and Zhaoqing, Guangdong, it can provide custom sliding window sizes, direct-from-factory pricing, and a hardware schedule you can review before you commit. Whether you are a distributor, contractor, or project specifier, asking for the hardware schedule up front is the single most effective way to protect your project.
If you are planning a project and want to compare sliding window price and specifications, contact ALPES for a detailed hardware schedule and quotation.
