QS6055/1B Black Heavy Duty Mortice Lock | Latch Bolt & Deadbolt

QS6055/1B Black Heavy Duty Mortice Latch Bolt & Deadbolt

The QS6055/1B is an extra heavy duty, silent-latching mortice lock finished in black powder coat. Combining a latch bolt and deadbolt in a single body, it delivers robust security and smooth, quiet operation — making it an ideal choice for exterior entrance doors, pivot doors, and high-traffic interior applications where a premium black finish is required.

This lock body is supplied without a cylinder. Select your preferred cylinder insert on this product page — either the QS1103B 60mm Black Double Cylinder or the QS1108BL 60mm Black Knob Cylinder.

Key Features

• Extra heavy duty construction — silent latching mechanism
• Latch bolt + deadbolt in a single lock body
• Black powder coated finish
• Complete with striker plate
• Cylinder not included — select on this product page
• Lead time: 3–4 days

Specifications

• Model: QS6055/1B
• Backset: 55mm
• Centre: 60mm
• Finish: Black powder coated
• Lock type: Mortice — latch bolt & deadbolt
• Cylinder: Not included — select on this product page
• Includes: Lock body + striker plate

Compatible Cylinders

This lock requires a 60mm cylinder insert. Select your preferred option on this product page:

• QS1103B — 60mm Black Double Cylinder — keyed both sides, ideal for exterior doors
• QS1108BL — 60mm Black Knob Cylinder — key outside, turn knob inside, ideal for entrance doors

Frequently Asked Questions

Is a cylinder included with this lock?

No. This lock body is supplied without a cylinder. You must select a compatible cylinder on this product page — either the QS1103B Black Double Cylinder or the QS1108BL Black Knob Cylinder.

What is the difference between a double cylinder and a knob cylinder?

A double cylinder (QS1103B) requires a key to operate from both sides — suitable for exterior doors where you want keyed access from inside and outside. A knob cylinder (QS1108BL) uses a key from the outside and a turn knob from the inside — more convenient for entrance doors where you want quick exit without a key.

What is the backset of this lock?

The backset is 55mm — this is the distance from the edge of the door to the centre of the keyhole. Ensure your door and handle set are compatible with a 55mm backset before ordering.

What does the 60mm centre refer to?

The 60mm centre refers to the distance between the centre of the latch bolt and the centre of the deadbolt. This must match the spacing on your door handles or escutcheon plates.

Is this lock suitable for exterior doors?

Yes. The QS6055/1B is an extra heavy duty mortice lock suitable for exterior entrance doors. The black powder coated finish is durable and weather-resistant. For exterior use, select the double cylinder option for keyed access from both sides.

Is a striker plate included?

Yes. A striker plate is included with the lock body.

What is the lead time for this product?

Lead time is 3–4 days from order confirmation. Nationwide delivery is available across South Africa.

Where can I buy this mortice lock?

This lock is available online at doorsdirect.co.za with nationwide delivery across South Africa, including Johannesburg, Cape Town, Durban, and Pretoria.

• Stainless steel

Delivery Information

At Doors Direct, we strive to make the delivery of your quality doors a seamless and convenient experience.

Nationwide Delivery:

Based in Durban, we extend our reach to bring our premium products directly to your doorstep anywhere in South Africa. Our efficient overnight transport ensures that you receive your order promptly.

Cost-Effective Options:

With a diverse range of transport service providers, we have the flexibility to secure competitive quotes, especially for bulk orders. Feel free to contact our office at 031 012 5033 to explore cost-saving options tailored to your needs.

Lead Times and Timely Delivery:

Our commitment to transparency is reflected in the lead times displayed on our website for made-to-order products. Once your order is dispatched, anticipate delivery within 24 – 48 hours, allowing you to enjoy your new doors without unnecessary delays.

Quality Assurance:

Doors Direct takes pride in delivering products that are undamaged and in excellent working order. While we make every effort to maintain the integrity of your purchase, we recognize that, on rare occasions, products may incur damage during shipping.

Damaged Products:

In the unfortunate event that your product arrives damaged, we have a straightforward solution. At our discretion, Doors Direct will either repair or replace damaged items. To facilitate this process, please ensure that the waybill is endorsed with details of the damages. For more details, refer to our comprehensive guarantee policy and terms and conditions at Guarantee Policy and Terms & Conditions.

Contact Us:

Have questions or need assistance? Contact our head office at info@doorsdirect.co.za or 087 012 5286. We are here to ensure your satisfaction at every step of the journey.

Thank you for choosing Doors Direct – Elevating your door-buying experience with quality, efficiency, and reliability.