Fully Concealed Stainless Steel Hinge

For those wholesale sourcing concealed cabinet hinges from Yitai Lock, the Fully Concealed Stainless Steel Hinge CL138 covers four variants across two materials and two clamp colors. The stainless steel versions are the natural pick for enclosures in humid or corrosive environments, while the carbon steel options work well for standard indoor distribution cabinet builds. Clamp color — black or red — is a visual distinction rather than a functional one, so selection there comes down to preference or matching existing cabinet hardware.

Structure and Dimensions

The Fully Concealed Stainless Steel Hinge has an overall length of 80 mm, with the hinge body running 40 mm and a 25 mm inner span between the two barrel ends. The barrel diameter is Φ6 mm, and the two barrel sections each extend outward from the centre body, giving the hinge its characteristic dumbbell profile. The clamp assembly sits at the barrel ends and is what keeps the hinge engaged with the door frame channel.

The mounting plate of the Fully Concealed Stainless Steel Hinge measures 39 mm tall and 25 mm wide, with two Φ7 mm mounting holes spaced 12 mm from the edge. The frame side shows a total depth of 18.5 mm with a 12.5 mm base, two Φ6 mm barrel holes, and a countersunk recess of ≥11.5 mm. The Φ6.5 mm clamp pin sits 2.5 mm proud of the leaf face with a 20 mm engagement length.

Installation and Mounting

The Fully Concealed Stainless Steel Hinge is installed by welding — the mounting plate is welded to the door panel and the hinge body engages the frame channel during assembly. The 90° opening means the door swings to a right angle from the cabinet face, which covers standard access requirements for most distribution and control cabinet configurations.

Once welded in, the Fully Concealed Stainless Steel Hinge sits recessed within the frame profile so the barrel and clamp assembly are hidden from the outside. The clamp mechanism at each barrel end locks the hinge into the frame channel and can be released for door removal when needed. This concealed engagement is also what makes the hinge compatible with Rittal cabinet frame systems, where the channel geometry suits this type of recessed hinge mounting.

Material and Clamp Options

The Fully Concealed Stainless Steel Hinge is available in carbon steel and stainless steel, with black or red clamp color across both materials — four variants in total. The stainless steel version is the better fit for enclosures in humid spaces, outdoor installations, or environments where corrosion resistance matters over time. Carbon steel suits dry indoor cabinet applications where the finish requirements are more standard.

The clamp color on the Fully Concealed Stainless Steel Hinge — black or red — is a cosmetic distinction with no difference in material or load capacity between the two. Red clamps are sometimes used as a visual indicator on specific cabinet lines or to differentiate hinge positions on multi-door enclosures; black clamps are the more common default. Either way, performance is identical.

Application Scenarios

The Fully Concealed Stainless Steel Hinge is used on distribution cabinets, control equipment enclosures, and switchgear panels where a flush, hardware-free door exterior is needed. The fully concealed profile keeps the hinge out of sight when the door is closed, which suits cabinets installed in visible locations — server rooms, control rooms, or public utility spaces — where exposed hinge hardware would look out of place.

Compatibility with Rittal cabinet frames makes the Fully Concealed Stainless Steel Hinge a straightforward drop-in option for manufacturers or integrators already working with that frame system. The stainless steel variant handles the corrosion requirements of outdoor or high-humidity enclosures, and the carbon steel option covers the bulk of standard indoor distribution cabinet builds where cost and environmental conditions are both moderate.

FAQ

Q1: What variants are available for the CL138?

The CL138 comes in four variants: carbon steel with black clamp, carbon steel with red clamp, stainless steel with black clamp, and stainless steel with red clamp. Clamp color is cosmetic only — there is no functional difference between black and red.

Q2: What is the opening angle of the CL138?

The CL138 concealed hinge opens to 90°, which covers standard access requirements for distribution cabinet and control enclosure doors.

Q3: How is the CL138 installed?

The CL138 is welded — the mounting plate is welded to the door panel during cabinet fabrication, and the hinge body engages the frame channel. There is no screw-mount option for this model.

Q4: Is the CL138 compatible with Rittal cabinets?

Yes, the CL138 concealed hinge is compatible with Rittal cabinet frames. The hinge channel engagement geometry suits the Rittal frame profile.

Q5: What do the clamp colors indicate?

Black and red clamps are color variants only — the material and load capacity are the same for both. Red is sometimes used as a visual indicator to differentiate hinge positions or cabinet lines; black is the more common default choice.

Q6: What material should I choose for outdoor enclosures?

The stainless steel version of the CL138 is the right choice for outdoor enclosures, humid environments, or installations where corrosion resistance is a long-term requirement. Carbon steel suits standard indoor distribution cabinet applications.