Addressing the specification challenge of variable door preparations across multi-unit residential and commercial projects, this Adjustable Hole Spacing Interior Door Handle supports four standard center-to-center measurements — 128mm, 160mm, 192mm, and 256mm — within a single lever lock platform. This design flexibility dramatically simplifies procurement and inventory management for contractors and hardware distributors who serve diverse building stocks. The handle body is fabricated from high-strength aluminum alloy with a brushed or PVD-coated surface that resists fingerprints, scratches, and daily cleaning chemicals. The lever profile features a carefully radiused edge and a contoured thumb rest, reducing hand strain during repeated use. A precision-engineered internal latch mechanism provides positive locking engagement with quiet, cushioned closure, ideal for bedrooms, bathrooms, offices, and healthcare facilities where acoustic comfort matters. Finished in elegant gold, brushed nickel, or matte black, each option delivers a distinct visual character while sharing the same dependable mechanical core. Manufactured under ISO 9001 quality systems with CE and RoHS compliance, and fully customizable through OEM/ODM programs, this handle system offers unmatched specification flexibility for the international building hardware market.

• 4-in-1 Hole Spacing Compatibility: One handle platform covers 128mm, 160mm, 192mm, and 256mm center-to-center measurements, dramatically simplifying specification and inventory management for multi-building projects.
• PVD Surface Engineering: Finishes are applied via Physical Vapor Deposition where specified, creating a molecularly bonded surface layer with hardness exceeding 2000 HV — significantly outperforming conventional electroplating in abrasion and tarnish resistance.
• Silent-Close Latch Technology: The latch bolt incorporates a polymer damper sleeve and the strike plate features an elastomeric noise-absorbing pad, reducing operational sound to whisper-quiet levels ideal for bedrooms, offices, and healthcare environments.
• Contoured Thumb Rest: A subtle depression on the lever's gripping face provides intuitive thumb placement, improving control and reducing grip fatigue during repeated daily use.
• Privacy Lock with Emergency Release: The privacy function includes an external emergency release slot, meeting international safety standards for bathroom and bedroom applications while maintaining secure locking.

With its adjustable hole-spacing platform, this lever lock is purpose-built for multi-unit residential buildings, hospitality renovations, and commercial fit-outs where existing door preparations vary across room types and construction eras. Key application environments include apartment complexes requiring privacy locks on bedrooms and bathrooms, hotel retrofit projects with legacy door prep patterns, hospital patient rooms where quiet operation is essential for patient comfort, and educational facilities needing durable, tamper-resistant door hardware. The silent-close mechanism delivers particular value in healthcare and senior living environments.

Q: How do I determine which hole spacing to use for my project?
A: Measure the center-to-center distance between the lever/handle mounting hole and the key cylinder or thumb-turn hole on your existing door. Common standards are 128mm (predominantly US/Asian markets), 160mm and 192mm (widely used across Europe and international projects), and 256mm (for larger doors or specific regional preferences). If you are unsure, take a photo with a measurement reference and send it to our technical support team — we will help identify the correct specification.

Q: What makes the silent-close mechanism different from standard latches?
A: Standard door latches use a metal spring bolt that produces a distinct clicking or snapping sound when engaging the strike plate. Our silent-close latch incorporates a polymer damper sleeve around the latch bolt and an elastomeric noise-absorbing pad integrated into the strike plate. When the door closes, the polymer sleeve cushions the bolt's impact, reducing operational noise to approximately 30-35 dB — comparable to a whisper. Additionally, an anti-rattle spring clip prevents residual vibration and buzzing after closure.