CompX National 8040 Disc Tumbler Sliding Door Lock Bright Nickel Key C346A, C8040-C346A-14A

CompX National 8040 Disc Tumbler Sliding Door Lock

CompX National 8040 disc tumbler sliding door lock bright nickel key C346A, C8040-C346A-14A is a bypassing and showcase door lock designed for sliding glass applications. This lock uses a ratchet bar that secures onto glass 1/4 inch and thinner, so it matches common showcase and display door glass thickness. The bright nickel finish matches typical display hardware, which helps maintain a consistent look on visible storefront or cabinet fronts. As a bypassing and showcase door lock, it is set up for sliding glass doors found on display cases and similar fixtures, aligning the lock design with this specific type of movement rather than hinged doors. The product is identified by manufacturer part number C8040-C346A-14A and key C346A, which supports accurate reordering or matching with existing keyed systems that use the same code.

Sliding Glass Lock Details That Support Daily Use

• The ratchet bar has a plastisol dip coating on the area that gets installed onto the glass, which cushions the contact point so the coated surface reduces glass rattling and helps provide a snug, stable fit during door operation.
• The plastisol coating is positioned where the bar meets the glass, so when the lock is tightened the soft coating spreads load across the surface, which helps protect the glass edge from hard metal contact under clamping pressure.
• A felt material is applied to the back of the lock body, so this soft layer sits between the glass door and lock body, which helps eliminate rattling and keeps the body from tapping against the glass when the door moves.
• The lock is classified under bypassing and showcase door locks, so its geometry and clamping approach are configured for sliding display doors, which supports smooth operation on typical showcase tracks without interfering with door travel.
• The bright nickel finish is specified for this CompX National lock, so the visible surfaces match other bright nickel display hardware, which matters when the lock is mounted on customer-facing showcases or presentation cabinets.

Set Screw And Ratchet Bar Installation Behavior

This sliding glass door lock uses a ratchet bar clamped to the glass, so the bar grips around glass 1/4 inch and thinner to hold the lock in position during use. A new set screw can be tightened down against the glass, and this screw pushes onto the plastisol coating rather than bare glass, allowing the installer to snug the lock in place while the coating distributes force. When the lock is placed in the locked position, the set screw and coated bar assembly resist drooping, so the lock body stays aligned with the intended locking point on the sliding door. The combination of the ratchet bar and set screw connection keeps the lock located where it was positioned, which helps maintain consistent engagement each time the case is locked.

Using This Sliding Glass Door Lock On Displays

Where This Sliding Glass Door Lock Works Best

This CompX National sliding glass door lock belongs to the bypassing and showcase door lock product class, so it is suited to sliding glass showcase or display doors where panels move past each other instead of swinging. The ratchet bar is designed for glass 1/4 inch and thinner, which aligns with many common showcase door glass thicknesses found in retail and woodworking-built displays. Because the ratchet bar clamps directly onto the glass area, the lock positions on the sliding panel itself, allowing the locking point to travel with the moving door rather than relying on a frame-mounted catch. The felt material used on the back of the lock body separates metal from glass, which is useful on quiet retail floors or office environments where noise from door vibration is unwanted.

Set Screw And Coatings For Consistent Results

The new set screw feature on this sliding glass door lock is designed to tighten against the glass while bearing on the plastisol coating, so the clamping force is delivered through a cushioned layer that reduces point loading on the glass edge. When the screw is snugged down, the lock resists drooping while locked, which keeps the key position and cylinder orientation consistent from lock-up to lock-up. The plastisol dip coating on the ratchet bar area not only cushions the glass but also increases friction at the contact zone, which helps the bar resist sliding along the panel under everyday handling. The felt material applied to the back of the lock body reduces rattling by damping vibration between the body and the glass surface, which supports a tight, quiet fit as doors are opened and closed throughout the day.

Common Questions About This Sliding Glass Lock

Selecting This Lock For Sliding Glass Doors

The CompX National 8040 disc tumbler sliding door lock bright nickel key C346A, C8040-C346A-14A brings a ratchet bar sized for glass 1/4 inch and thinner, along with plastisol and felt contact surfaces that control rattling. The new set screw design holds the lock body in position without drooping in the locked position, supporting consistent alignment on bypassing and showcase doors. For projects that match this glass thickness and showcase style, this lock offers a targeted fit with clear identification by part number and key code.