Intro
The Superior Brass Knob Lock 57mm Centres Polished Brass 200x50mm is a premium door hardware solution designed for use with sash locks on internal and external doors. Crafted from solid brass and engineered with a patented stainless steel ball bearing mechanism, it delivers smooth operation, enhanced durability, and fire-rated performance for demanding applications.
Key Features & Benefits
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✅ Function: Knob lock set for sash lock applications
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✅ Design: Traditional knob profile with extended backplate
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✅ Finish: Polished Brass for a timeless, elegant appearance
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✅ Material: Solid Brass construction for strength and long service life
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✅ Mechanism: Patented stainless steel ball bearing mechanism for smooth, long-lasting operation
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✅ Fire Rating: Tested and rated for up to 4 hours fire resistance
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✅ Compatibility: Designed to suit 57mm centres sash locks
Specifications
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Backplate Size: 200mm x 50mm
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Centres: 57mm
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Projection: 74mm
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Function: Knob lock
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Base Material: Solid Brass
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Finish: Polished Brass
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Fire Rating: Up to 4 hours
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Unit of Measure: Pair
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Compatible Locks: 3 Lever Lock x9020 (45mm) or x9021 (60mm)
Applications
This knob lock set is ideal for traditional internal and external doors requiring sash lock functionality. Its fire-rated construction and robust design make it suitable for heritage homes, residential renovations, and compliant commercial projects.
Installation & Inclusions
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Suitable for standard door installation
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Recommended installation by a qualified locksmith or experienced tradesperson, particularly for fire-rated doors
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Includes pair of knob lock handles and fixing components (lock supplied separately)
Available Finishes
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Polished Brass
Why Choose Superior Brass?
Superior Brass is trusted for producing premium solid brass architectural hardware that combines classic aesthetics with advanced engineering. This knob lock set delivers dependable security, smooth operation, and fire-rated assurance for long-term performance.
👉 This is a knob lock set designed for use with 57mm centres sash locks on internal or external doors.
Q2. What material is it made from?
👉 It is manufactured from solid brass and incorporates a patented stainless steel ball bearing mechanism for enhanced durability and smooth operation.
Q3. Is this knob lock fire rated?
👉 Yes, this knob lock set is tested and rated for up to 4 hours fire resistance when installed correctly with compatible fire-rated doors and locks.
Q4. What warranty does this product come with?
👉 This product falls under locks, cylinders and latches and includes a 10 Years Mechanical Warranty and 5 Years Finish Warranty, applicable under normal residential use with correct installation and maintenance.
Q5. What finish is available for this model?
👉 This model is available in a Polished Brass finish, offering a classic and refined look for traditional and compliant door applications.
Payment & Security
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