Surface Bolts

Shop surface bolts and surface-mounted slide bolts for double doors, French doors, and other openings that need an auxiliary bolt. A surface bolt mounts visibly on the door and slides into a matching strike or keeper. On a compatible door pair, it can hold the inactive door closed while the active door remains available for everyday use.

Compare bolt length, throw, mounting dimensions, strike type, door material, and operating clearance before choosing a finish. For replacement work, match the existing screw pattern and keeper position. Check each model's intended application, included hardware, and installation instructions to select a bolt that fits your opening.

Choosing Surface Bolts and Slide Bolts for Doors

A surface bolt secures a door by sliding a rod or bolt into a keeper mounted on the adjoining frame or another suitable receiving point. Unlike recessed flush bolts, its body remains visible on the door surface. Surface bolts for double doors and French doors are commonly used on the inactive leaf. Choose the mounting style that suits the existing door preparation and leaves enough clearance for both doors to open and close without interference.

Start with the bolt's overall length, body width, mounting-hole spacing, projection, and throw—the distance the bolt extends. A longer body does not automatically mean a longer throw or a stronger installation. If replacing an 18-inch surface bolt or another extended model, compare the full dimensions and operating position rather than length alone. For heavy-duty surface bolts, review the manufacturer's intended use, materials, fasteners, and mounting requirements instead of relying on appearance or the heavy-duty label alone.

The strike or keeper must match the bolt and the opening. Depending on the model and installation, the receiving hardware may be positioned at the frame or floor. Check alignment, door clearance, and the mounting surface before selecting a floor-bolt arrangement. A surface bolt latch is not necessarily keyed or lockable; verify the operating function if you need a locking surface bolt. Also check whether strikes and mounting screws are included or must be ordered separately.

For surface bolt installation, follow the instructions for the exact model and door material. Confirm the mounting position, required fasteners, and keeper alignment before drilling, then check that the bolt travels freely and fully engages its strike. Surface-mounted hardware and recessed hardware require different preparations, even when search terms such as surface-mounted flush bolt are used interchangeably. On an opening with fire-rating or exit requirements, confirm that the proposed auxiliary bolt is permitted for that assembly before installation.

Choose the finish after confirming fit and function. When comparing brass or black surface bolts, distinguish the listed finish from the underlying material and check suitability for the installation environment. For brand-specific options, browse Ives flush bolts and surface bolts. For a larger project, explore related commercial door hardware and coordinate the bolt with the rest of the opening. Matching the original model and preparation is especially useful when replacing existing hardware.