Lockwood 3570 Series 89mm Mortice Dual Cylinder Entry Deadlatch - No Cylinder - Satin Chrome
The Lockwood 4577SC is an 89mm mortice dual cylinder entry deadlatch from the Lockwood 3570 Series (Synergy range), supplied without cylinders. The dual cylinder configuration means a key is required to lock or unlock the latch from both the outside and inside. The deadlatch provides anti-shimming security for locking functions.
Built to meet Australian Standard requirements, this lock is suited to heavy duty use in industrial and commercial buildings, institutions, clubs, schools, hospitals, hotels and similar environments. It is compatible with all Lockwood rose and plate furniture, including Brass Door Furniture, Daintree, Aquileart, Artefact Series II and Ovation Series. Cylinders are not included, allowing the appropriate keying system to be specified for the project.
Estimated Warehouse Dispatch
Usually ships in 12 business days
Usually ships in 12 business days
Non-Returnable Item
This product is a security lock component and is not returnable. Please confirm the function, backset and cylinder requirements before ordering.
This product is a security lock component and is not returnable. Please confirm the function, backset and cylinder requirements before ordering.
Key Features
- Lockwood 3570 Series (Synergy) 89mm mortice dual cylinder entry deadlatch.
- Dual cylinder configuration - key required to lock or unlock from both outside and inside.
- Deadlatch for anti-shimming security on locking functions.
- No cylinders included - allows selection of preferred keying system.
- Reversible handing.
- Suitable for minimum 32mm door thickness.
- Compatible with all Lockwood rose and plate furniture.
- Tested to Australian Standard.
- Suitable for heavy duty commercial and institutional use.
- Satin Chrome finish.
What's in the Box
- 1 x Lockwood 4577SC mortice lock body (dual cylinder, Satin Chrome)
- Cylinders not included - select separately
- Door furniture not included - select compatible Lockwood furniture separately
Suitable Uses
- Industrial and commercial buildings requiring dual cylinder key control on both sides.
- Institutions, clubs, schools, hospitals and hotels where inside key control is required.
- Applications where the inside must not allow free egress without a key - such as secure rooms, plant rooms or areas requiring controlled two-way access.
- Projects where the keying system is to be specified separately.
Full Specifications
Frequently Asked Questions
- What does dual cylinder mean on this lock?
Dual cylinder means a key is required to lock or unlock the latch from both the outside and the inside. Neither side allows free egress without a key when the lock is in the locked position. This is different from a standard entry lockset where the inside lever always allows free exit. The 4577SC is suited to applications where two-way key control is required, such as secure rooms or restricted access areas. - What is the difference between a deadlatch and a deadbolt?
A deadlatch is a spring-loaded latch bolt that automatically deadlocks when the door closes, preventing it from being shimmed open with a thin tool. A deadbolt is a separate bolt that must be manually thrown by key or turn. The 4577SC uses a deadlatch, meaning the latch self-locks on closing and key operation locks or unlocks it. - Are cylinders included?
No. The 4577SC is supplied without cylinders. Cylinders must be sourced and ordered separately. Confirm the correct key profile and keying system with your locksmith before purchasing cylinders. - What furniture is compatible with this lock?
The 4577SC is compatible with all Lockwood rose and plate furniture, including Brass Door Furniture, Daintree, Aquileart, Artefact Series II and Ovation Series. Furniture is not included and must be ordered separately. - Why is the backset 89mm rather than the standard 60mm?
The 89mm backset is required on certain door types where the standard 60mm backset places the cylinder hole too close to the door edge, particularly on wide-stile timber or metal doors. Always measure the available backset on the door before ordering to confirm the correct model.
Additional Information
- The 3570 Series primary lock is the 3572SC (standard entry function). The 4577SC is a specific function variant in the same series - dual cylinder with 89mm backset. Lockwood recommends specifying the 3572SC as the primary lock when building a suite, as it can be adapted to the required function.
- The dual cylinder function is commonly specified for secure rooms, plant rooms, restricted access corridors and similar applications where no one should be able to exit without a key, or where inside key control is required for security reasons. This function is not suitable for fire egress doors or doors on escape routes.
- No cylinders are supplied with this lock. This allows the installer or locksmith to source cylinders in the correct key profile for the project keying system - including restricted or master key profiles - without being locked into a specific factory keying.
- The lock is reversible for left or right hand application. Confirm the required handing with the installer before ordering.
- Installation should be carried out by a qualified locksmith or door hardware installer familiar with the Lockwood 3570 Series.
Lockwood Warranty (Australia)
Lockwood branded products purchased new in Australia from authorised resellers are covered against defects in materials and workmanship for:
Lockwood branded products purchased new in Australia from authorised resellers are covered against defects in materials and workmanship for:
- Mechanical components: 25 years
Cosmetic finishes, normal wear and tear, misuse, unauthorised modification, corrosion and labour or freight costs are excluded.
This warranty operates in addition to rights available under the Australian Consumer Law.
Download PDF Resources
Lockwood Synergy Mortice Locks Catalogue
Lockwood Synergy Mortice Locks Catalogue
Download PDF Resources
Lockwood Synergy Mortice Locks Catalogue
Lockwood Synergy Mortice Locks Catalogue
Lockwood Warranty
Lockwood branded products are covered by manufacturer warranties issued by ASSA ABLOY Australia Pty Ltd. Warranty periods vary by product type, with separate cover for mechanical components, electrical and electronic parts, keys, and finishes.
The summary below sets out the standard warranty structure. All warranty claims are handled by Terry's Tradies Pty Ltd and its associated websites, trading names, and subsidiaries. Full terms and exclusions are set out in the official Lockwood warranty document linked at the base of this page.
Warranty Summary
Finish Coverage Guide
- Everbrass finishes: up to 25 years against corrosion, tarnishing and discolouration.
- Stainless steel, polished stainless steel, chrome plating and anodised finishes: typically up to 10 years.
- PVD and VIVID finishes: typically up to 10 years.
- Symmetry range finishes: typically up to 5 years.
- Decorative finishes (Antique Copper, Architectural Bronze, Oil Rubbed Bronze, Aged Brass, Polished Brass, Satin Brass and related variants): typically up to 2 years against corrosion.
- Unlacquered brass finishes naturally age and change appearance over time. This is not considered a defect.
- Tea staining of stainless steel is not covered where the required cleaning and maintenance have not been followed.
How to Make a Claim
For full returns and warranty claim procedures, visit our Returns & Warranty page - this is kept up to date and is the authoritative reference for current claim steps.
- Contact Terry's Tradies Pty Ltd and its associated websites, trading names, and subsidiaries with your proof of original purchase.
- Keep the product securely packed and clearly identified, ready for assessment.
- Where a claim is escalated to the manufacturer, ASSA ABLOY may issue a case number before goods are returned.
- ASSA ABLOY assesses the claim and determines repair, replacement with the same or closest equivalent product, or refund of the purchase price.
Exclusions
- Normal wear and tear.
- Misuse, abuse, accidental damage or use outside published specifications.
- Improper maintenance or failure to follow care instructions.
- Unauthorised modification, repair or use of non-genuine parts.
- Exposure to corrosive environments including coastal air, salt spray, chemicals or pollution.
- Removal, refitment or associated labour charges.
- Products not originally sold in Australia through authorised channels.
Australian Consumer Law
These manufacturer warranties apply in addition to your rights under the Australian Consumer Law. Our goods come with guarantees that cannot be excluded under the ACL. You are entitled to a replacement or refund for a major failure and to compensation for any other reasonably foreseeable loss or damage. Where a failure does not amount to a major failure, you are entitled to have the goods repaired or replaced.
These manufacturer warranties apply in addition to your rights under the Australian Consumer Law. Our goods come with guarantees that cannot be excluded under the ACL. You are entitled to a replacement or refund for a major failure and to compensation for any other reasonably foreseeable loss or damage. Where a failure does not amount to a major failure, you are entitled to have the goods repaired or replaced.
