Smiths Architectural Tubular Bolt-Thru Latch

The Smiths Architectural Tubular Bolt-Thru Latch (76mm) is a high-performance internal door latch crafted for functionality, longevity, and seamless design integration. Finished in either Antique Bronze or Matt Black, this latch is a dependable choice for operating internal doors fitted with either lever handles or door knobs.

Ideal for both residential and commercial applications, the latch is designed to be morticed into the door and functions as the internal locking mechanism that retracts with the movement of a handle. The bolt-through design allows for enhanced alignment and secure fixing of lever handles using bolt-through fixings, offering superior durability over standard wood screw methods.

Key Features

• Size: 76mm (3") overall case length – ideal for most internal door installations, balancing aesthetics and handle clearance.
• Function: Allows the door to be opened and closed using a lever handle or knob without a locking mechanism. Commonly used in passageways, hallways, kitchens, living rooms, and utility areas.
• Bolt-Through Fixing Compatibility: Provides compatibility with lever handles that use through-bolts for added stability and alignment precision, especially in high-use environments.
• Mortice Fitting: Designed to be morticed (recessed) into the edge of the door for a clean, flush finish.
• Striking Plate & Fixings Included: Comes complete with a matching faceplate, strike plate, and screws for a secure fit and polished appearance.
• Finishes Available:
  • Antique Bronze: Offers a classic, warm, aged appearance ideal for traditional or industrial-style interiors.
  • Matt Black: Sleek and bold, providing a clean contemporary aesthetic that complements modern door hardware.

Boxed Dimensions & Weight

• Antique Bronze:
  • Width: 10.0 cm
  • Height: 15.0 cm
  • Depth: 25.0 cm
  • Weight: 110g
• Matt Black:
  • Width: 10.0 cm
  • Height: 15.0 cm
  • Depth: 25.0 cm
  • Weight: 150g

Technical Specifications

• Backset: Approx. 57mm (from door edge to spindle hole centre), based on 76mm latch length
• Spindle Hole Diameter: Standard size for 8mm spindle
• Faceplate Dimensions: Typically 57mm x 25mm (may vary slightly by finish)
• Bolt Material: Heavy-duty steel bolt with anti-rattle mechanism for quiet operation
• Fixings: Includes screws and matching finish faceplate and strike plate
• Door Thickness Compatibility: Suitable for doors 35mm to 54mm thick
• Fire Door Compatible: Check local certification requirements; may be suitable when used with intumescent kits

Applications

• Interior passage doors (living rooms, kitchens, dining areas)
• Non-locking bedroom doors
• Offices and commercial spaces requiring easy passage
• Rooms where privacy is not required but latching is desired
• Suitable for both right- and left-hand doors

Installation Guidance

• Step 1: Mark and mortice the latch body into the door edge using the 76mm size template.
• Step 2: Drill the spindle hole through the door face at the correct backset.
• Step 3: Attach the latch body into the mortice, securing with provided screws.
• Step 4: Install lever handles or knobs, ensuring bolt-through alignment where applicable.
• Step 5: Fit the strike plate to the door frame, marking alignment with the bolt position.

Frequently Asked Questions (FAQs)

Q: What is the difference between bolt-through and standard latches?
Bolt-through latches allow lever handles to be fixed through the door using bolts for increased strength and alignment, rather than just using wood screws.

Q: Can this latch be used with knobs as well as lever handles?
Yes, it is compatible with both types of hardware, provided they are suitable for bolt-through or standard spindle operation.

Q: Is the latch reversible for left and right-handed doors?
Yes, the latch is non-handed and can be installed in either door orientation.

Q: Is this suitable for fire doors?
This latch may be suitable for fire-rated doors when installed with intumescent kits and in accordance with local fire regulations.

Q: How is the finish maintained over time?
Both Antique Bronze and Matt Black finishes are designed to resist tarnishing and general wear under normal interior conditions.

Why Choose Smiths Architectural?

Smiths Architectural is known for blending timeless design with technical precision across all their architectural ironmongery. The Tubular Bolt-Thru Latch (76mm) upholds this standard with smooth performance, stylish finishes, and exceptional compatibility with their lever handle collections.

Choose the Smiths Architectural Tubular Bolt-Thru Latch for reliable performance, versatile installation, and finishes that elevate any interior door hardware scheme.