Sash Lock for Internal Doors (DDML039)
Product Overview
D&D HARDWARE’s Sash Lock for Internal Doors (Model: DDML039) is a high-performance door lock engineered exclusively for internal door security, fire safety, and long-term durability. Compliant with CE EN12209 Grade 3 (top European security standard) and EN1634 (260-minute fire resistance), this lockset combines a dual-function design—integrated latch bolt and 2-turn deadbolt lock—to deliver both daily privacy and emergency fire protection. Crafted entirely from solid SUS304 stainless steel (latch bolt, deadbolt, follower, forend, strike plate), it resists corrosion (240-hour EN1670 test) and seamlessly integrates with D&D’s door handles, Concealed Hinges, and door closers, forming a cohesive door hardware system. With a 45mm backset and versatile square/radius forend options, it is ideal for bedrooms, hotel guest rooms, office partitions, and institutional internal doors—meeting the strict safety and aesthetic demands of global B2B buyers.
Sash Lock for Internal Doors - Technical Specifications
- Model Number: DDML039
- Brand: D&D HARDWARE
- Compliance Standards: - CE EN12209 Grade 3 (European top security rating for mortise locks) - EN1634: 260-minute fire resistance (maintains integrity at 840°C) - EN1670: 240-hour corrosion resistance (neutral salt spray test, no rust) - 200,000-cycle durability test (simulates 25+ years of internal door use)
- Material Composition: Solid SUS304 Stainless Steel (latch bolt, deadbolt, follower, forend, strike plate) – hardness ≥ HRC 42, anti-deformation/anti-rust
- Backset: 45mm (optimized for internal door thicknesses: 35–50mm)
- Distance (Lock Case Length): 72mm
- Forend & Strike Plate: - Design: Square (modern/industrial interiors) or Radius (traditional/contemporary styles) - Thickness: 3mm (high strength, no bending under fire pressure)
- Deadbolt Operation: 2-turn mechanism (full extension length: 18mm, ensures secure locking for internal privacy)
- Finish Options: SSS (Satin Stainless Steel), PSS (Polished Stainless Steel), PVD (Matte Black/Bronze), PB (Polished Brass), AB (Antique Brass), AC (Antique Copper)
- Warranty: 10-Year Mechanical Warranty (includes fire performance coverage for 5 years)
Sash Lock for Internal Doors - Product Images and Videos
Sash Lock for Internal Doors - Product Features & Advantages
- 260-Minute EN1634 Fire Resistance for Internal Safety: Engineered to withstand extreme temperatures (840°C) for 260 minutes, preventing fire and smoke spread through internal doors—critical for hotel guest corridors, hospital patient wings, and office floor partitions. The SUS304 deadbolt resists warping, ensuring the lock remains functional during emergencies.
- CE EN12209 Grade 3 Top-Level Internal Security: Features an anti-pick 6-pin cylinder (mushroom pins block picking attempts), anti-drill hardened steel inserts (resists 5+ minutes of drilling), and 2-turn deadbolt (prevents forced entry via credit card or tools). Ideal for securing valuables in home offices, hotel mini-bars, and institutional storage rooms.
- Full SUS304 Construction for 240-Hour Corrosion Resistance: All components pass 240-hour salt spray tests (EN1670) with zero rust—perfect for internal doors near bathrooms, kitchens, or coastal villas where moisture is present. Outperforms zinc-alloy or plated locks that degrade within 1–2 years in humid environments.
- Dual-Function Latch + Deadbolt for Versatility: The integrated latch bolt enables daily push/pull door operation (no key needed for frequent use), while the 2-turn deadbolt provides privacy/security when needed. Eliminates the need for separate door bolts, simplifying hardware procurement for contractors.
- Seamless Integration with D&D Internal Hardware: Designed to work with D&D’s door handles (matching 8×8mm follower and finishes like PVD black or SSS), Concealed Hinges (for clean internal door aesthetics), and door closers (for automatic latching in commercial spaces). Standard mounting patterns reduce installation time by 40%.
Sash Lock for Internal Doors - Installation & Usage Steps
- Pre-Installation Preparation: - Confirm internal door thickness (35–50mm)、fire rating requirement (260-minute compatible if needed), and select matching forend design (square for modern offices, radius for traditional hotels). - Gather tools: Drill (3mm/6mm bits), fire-rated chisel (for fire-door installations), Phillips screwdriver, tape measure, pencil, level. - Check compatibility with D&D’s door handle (ensure 8×8mm follower matches handle spindle).
- Mark & Create Mortise for Internal Doors: - Use the included template to mark the mortise outline on the door edge (align with 45mm backset). - Drill pilot holes along the outline, then chisel the mortise to fit the lock body (depth = lock length; width = forend width). For fire-rated doors, ensure mortise edges are smooth to maintain fire-seal integrity. - Chisel a shallow recess (depth = 3mm forend thickness) on the door edge for flush installation.
- Install Lock Body & Follower: - Insert the lock body into the mortise (use a soft mallet to tap gently—avoid damaging internal door surfaces), align the forend with the recess. - Secure with provided SUS304 screws (tighten to 6–8 ft-lbs torque—over-tightening may split thin internal doors). - Test latch/deadbolt operation: Push the latch bolt in manually (should retract smoothly); turn the follower 2 full turns to extend the deadbolt (confirm 18mm extension).
- Mount Strike Plate: - Close the door, extend the latch bolt and deadbolt, then mark the strike plate position on the door frame (use a level to avoid misalignment—prevents latch jamming). - Chisel a recess for the strike plate (depth = plate thickness) and separate holes for the latch bolt and deadbolt. - Secure the strike plate with short screws (prevents penetration through thin frame materials common in internal partitions).
- Final Testing & Pairing with Hardware: - Install D&D’s door handle by inserting the spindle into the lock follower; secure with handle set screws. - Test daily use: Push/pull the door to confirm latch engagement; turn the handle to retract the latch. - Test security: Turn the key 2 full turns to extend the deadbolt; attempt to open the door (should remain locked). For fire-rated doors, pair with D&D’s door closer to ensure automatic latching.
Sash Lock for Internal Doors - Application Scenarios
The DDML039 Sash Lock for Internal Doors excels in privacy-focused, safety-critical internal environments, delivering tailored value across industries:
- Residential (Apartments, Villas, Homes): - Use Case: Bedroom doors, home offices, walk-in closet doors, basement internal doors. - Value: Dual latch/deadbolt design balances convenience and privacy; SUS304 resists bathroom moisture; finishes match cabinet handles for home decor cohesion.
- Hospitality (Luxury Hotels, Resorts, Boutique Inns): - Use Case: Guest room internal doors, dining area private booths, spa treatment rooms, housekeeping closets. - Value: Fire resistance meets hotel safety codes; silent operation avoids guest disturbance; PVD finishes match hotel door hardware (e.g., door handles, Bathroom Door Stops).
- Commercial (Offices, Malls, Co-Working Spaces): - Use Case: Office meeting room doors, co-working private pods, mall retail stockroom doors, reception area partitions. - Value: CE EN12209 Grade 3 security protects sensitive documents; compatible with panic hardware for emergency egress; 200,000-cycle durability withstands high traffic.
- Institutional (Hospitals, Schools, Nursing Homes): - Use Case: Hospital patient room internal doors, school classroom doors, nursing home resident rooms, laboratory internal partitions. - Value: Fire resistance protects vulnerable users; easy cleaning meets hygiene standards; 10-year warranty reduces maintenance costs for budget-limited institutions.
Value for Buyers: - Architects/Designers: Meet fire/security codes without compromising internal door aesthetics; finishes align with door hardware palettes (e.g., PVD black with black door stops). - Contractors: Dual-function design reduces hardware SKUs; bulk supply (200,000 units/month) meets tight project timelines; 10-year warranty cuts callbacks. - Facility Managers: Low maintenance (annual lubrication only); fire/security performance reduces liability; corrosion resistance extends lifespan in humid internal spaces. - Distributors: Niche focus on internal doors fills market gaps; OEM/ODM options support private-label branding for regional door hardware clients.
Certifications and Compliance
- International Fire & Security Certifications: - CE EN12209 Grade 3: European standard for mortise locks—tested for anti-pick (10min)、anti-drill (10min)、anti-snap (600N)、and 200,000-cycle durability. - EN1634: European fire resistance standard—260-minute rating (tested per EN 1363-1: exposure to 840°C flame, no structural failure). - EN1670: 240-hour neutral salt spray test (ISO 9227)—no rust or corrosion, confirming suitability for moisture-prone internal spaces. - UL 10C: US fire resistance standard—compatible with 1-hour fire-rated internal doors (when paired with D&D’s fire-rated door closers).
- Factory Compliance: - SGS Audited Factory: Verified for ethical manufacturing、traceable material sourcing (each unit links to its steel mill batch)、and fire-rated product production controls—meeting global supply chain requirements for hospitals、hotel chains、and government projects.
Sash Lock for Internal Doors - Customization Options
D&D offers tailored solutions for DDML039 to meet project-specific internal door needs, supporting global B2B buyers with OEM/ODM services:
- Material Upgrades: - SUS316 Stainless Steel: Enhanced corrosion resistance for coastal villas、marine resorts (500-hour salt spray test, no rust). MOQ: 500 units. - Solid Brass: Premium option for luxury hotels、heritage buildings (hand-polished finish, develops unique patina over time). MOQ: 300 units.
- Size & Design Customization: - Backset Adjustment: 50mm、55mm for thicker internal doors (e.g., villa solid wood bedroom doors). MOQ: 1,000 units. - Forend Customization: Branded forend cutouts (e.g., hotel logos、corporate emblems) for internal door branding. MOQ: 2,000 units.
- Finish & Aesthetic Customization: - RAL/Pantone Color Matching: Brand-specific hues (e.g., office corporate colors、school pastels) for PVD finishes. MOQ: 300 units. - Dual-Tone Finishes: SSS body + PB forend (matches traditional villa door hardware). MOQ: 1,000 units.
- Functional Modifications: - Thumbturn Deadbolt: Internal thumbturn (no key needed) for bathroom adjacent internal doors—ideal for apartments and nursing homes. MOQ: 500 units. - Privacy Indicator: Add a red/green "Occupied/Vacant" slider (visible from outside) for office meeting rooms. MOQ: 500 units.
- OEM/ODM Services: - Private Label: Custom logos on forends、branded packaging、and multilingual installation manuals (for door hardware distributors). MOQ: 2,000 units. - Custom Fire Rating: Engineered for 300/360-minute EN1634 ratings (for high-risk internal spaces like data center server rooms). MOQ: 3,000 units.
