Intro
The Superior Brass Knob Lock 57mm Centres Polished Brass 150x50mm is a premium door hardware solution designed for use with traditional sash locks. Manufactured from solid brass and engineered with a patented stainless steel ball bearing mechanism, it delivers smooth operation, long-term durability, and fire-rated performance with classic styling.
Key Features & Benefits
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✅ Function: Knob lock set for sash lock applications
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✅ Design: Traditional knob profile with compact rectangular backplate
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✅ Finish: Polished Brass for a timeless and elegant appearance
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✅ Material: Solid Brass construction for strength and longevity
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✅ Mechanism: Patented stainless steel ball bearing mechanism for smooth and reliable 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: 150mm 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 using sash locks. Its fire-rated construction and classic appearance make it suitable for heritage homes, residential renovations, and compliant commercial installations.
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 premium solid brass architectural hardware that blends classic aesthetics with advanced engineering. This knob lock set provides dependable security, smooth performance, and certified fire-rated assurance.
👉 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 door applications.
Payment & Security
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