Lockwood 3770 MkII Mortice Nightlatch — 60 mm Backset, Satin Stainless (SSS)
The Lockwood 3770 MkII is a mortice nightlatch for commercial and institutional doors. It latches automatically on closing, suits 570 cylinders, and is designed for heavy-duty use in schools, hospitals, hotels and similar buildings. Inside operation is via turnsnib or key; outside via key.
Estimated Warehouse Dispatch: 2 Days
Key Features
- Nightlatch function: door auto-latches when closed; key operation outside, turnsnib/key inside.
- 60 mm backset standard (this model).
- Heavy-duty mortice case for commercial environments.
- Through-fixing provision for roses/escutcheons for robust furniture anchoring.
- Compatible with Lockwood 570 cylinders and restricted systems.
- Reversible handing; suits 32–50 mm door thickness.
Fire Rated
- Tested up to 4 hours on fire door assemblies (per manufacturer data).
Specifications
- Item Code: 3770SS
- Function: Mortice Nightlatch (Primary)
- Backset: 60 mm
- Door Thickness: 32–50 mm
- Handing: Reversible
- Case Material: Zinc
- Bolt/Latch: 15 mm projection; stainless steel latchbolt
- Cylinder: 570 profile; 2-cylinder configuration
- Standards (AS4145.2): Security S7, Durability D8, Corrosion C6
- Use: Commercial/industrial/institutional doors
What's In The Box
- Lockwood 3770 MkII mortice nightlatch body (60 mm backset)
- Faceplate & strike (Satin Stainless Steel – SSS)
- Fixing screws
3770 MkII Nightlatch — Item Code Family
Warranty
- Mechanical Warranty: 25-year mechanical warranty (conditions apply).
- Finish & other components: As per Lockwood warranty terms.
Download PDF Resources
|
Lockwood 3700 Series Mortice Locks — Service Manual |
|
Lockwood Selector 3700 Series Mortice Locks — Catalogue |
|
Lockwood 25-Year Mechanical Warranty (Conditions Apply) |
Additional Information
- Suitable for pairing with a wide range of Lockwood 1800/2800 series furniture and 570 cylinders (sold separately).
- Hold-back: not available on nightlatch function.
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.
