When building cabinets with Tandem drawer slides, front locking devices are not just an optional accessory—they're a vital component. These devices securely attach the drawer front to the slide system, providing critical adjustability and ease of installation. Whether you're working on inset or overlay applications, choosing the right front locking device can significantly impact your drawer's performance and aesthetics.
Let’s break down the different types of front locking devices available, their features, and when to use each one.
What Are Front Locking Devices?
Front locking devices are fittings that attach Tandem drawer slides to the drawer front. They ensure the drawer operates smoothly and aligns perfectly within the cabinet frame. These devices also allow for fine adjustments after installation, including:
- Vertical (up/down) adjustments
- Horizontal (side-to-side) adjustments
- Depth (in/out) adjustments for inset drawers
- Compatibility with Servo-drive push-to-open systems
Two Main Types: With or Without Side-to-Side Adjustment
Front locking devices come in two primary forms:
- Without Side-to-Side Adjustment
These models offer up/down adjustments but cannot shift the drawer left or right. They are suitable for applications where precise side-to-side alignment isn’t a concern. - With Side-to-Side Adjustment
These include an additional wheel mechanism allowing 1.5mm adjustment in either horizontal direction. Ideal for aligning drawer fronts perfectly within cabinetry—especially important in high-end or inset applications.
Key Models & Features
1. BT51.1801 – Basic Front Locking Device
- Vertical Adjustment: Yes (3mm)
- Horizontal Adjustment: No
- Mounting Options: Can be screwed directly into the drawer bottom (requires at least a 1/2" thick bottom) or sub front (requires angled predrilled holes).
- Right/Left Members: Captive right-side member for a secure fit; tolerance on left-side member allows some lateral play.
- Drawer Front Compatibility: Overlay and inset
- Notes: Simple, reliable, and widely used.
2. BT51.1801 with Vertical Mounting Bracket
- Same features as BT51.1801, plus:
- Vertical Mount Tab: Adds flexibility for vertical attachment.
- Sub Front Requirement: Minimum 5/8" thickness
- Use Case: Excellent for applications where bottom mounting isn’t ideal or additional support is needed.
3. Narrow Drawer Front Locking Device
- Designed For: Drawers as narrow as 3 3/4"
- Vertical Adjustment: Yes (3mm)
- Horizontal Adjustment: No
- Mounting Style: Vertical mount only; requires precise predrilled holes to prevent material splitting.
- Recess Requirement: 1/2" for proper installation
- Use Case: Perfect for specialized applications like spice drawers or tight spaces.
4. Front Locking Devices With Side-to-Side Adjustment
- Vertical Adjustment: Yes (3mm)
- Horizontal Adjustment: Yes (1.5mm each side)
- Mounting Options: Bottom or angled sub front mounting
- Notes: These provide critical flexibility during drawer alignment—especially useful in custom cabinetry where millimeter-level alignment matters.
5. Side-to-Side Adjustable + Vertical Mount Adapter
- Same features as above, with:
- Vertical Mount Tab: Allows top-down screw installation.
- Sub Front Thickness: Minimum 5/8"
- Inset Drawer Focus: Built-in depth (outward) adjustment
- Servo-Drive Ready: Includes a built-in bumper to activate Servo drive push-to-open systems.
- Best Use Case: Ideal for inset drawers requiring precise alignment and push-open functionality.
Compatibility Notes
While these front locking devices work with most Tandem series drawer slides, they do not support:
- Tandem Edge slides
- Movento slides
Always check manufacturer compatibility before selecting your locking device.
Installation Tips
- Use the Blum Tandem drilling template for precise hole angles.
- Ensure appropriate sub front thickness (typically 1/2" to 5/8").
- Pre-drill holes to prevent splitting, especially when using vertical mount brackets.
- Test fit the drawer slides before final attachment to ensure locking devices engage correctly.
Best Recommendation for Inset Drawers
If you’re installing inset drawer fronts, the BT51.1901 PS is highly recommended. It offers:
- Vertical, horizontal, and depth adjustments
- A Servo-drive compatible bumper
- Strong mounting flexibility
This model provides all the fine-tuning needed to align drawer fronts flush with the cabinet face for a clean, professional finish.
Final Thoughts
Front locking devices might be small components, but they play a big role in delivering quality cabinetry. From basic overlay applications to sophisticated inset drawers with Servo-drive, there’s a locking device that meets your needs.
Choose the right model based on your drawer type, adjustability requirements, and installation preferences—and enjoy the precision and durability that comes with well-installed Tandem drawer systems.
Please do not hesitate to reach out with any questions on orders, products, alternatives, projects, etc. Our staff are ready to help Monday thru Friday 8am - 5pm CST.
Our toll free number is 800-383-0130 or email us at [email protected].