The KR SightLink E3040 Rosette 20 cm Extension Arm adds 200 mm / 7.9 in rosette-center span to a rigid, indexed mounting chain for cameras, lights, sensors, and adapter plates on 3030 / 4040 extrusion. Rosette patterns at both ends let the arm lock into repeatable tooth positions instead of relying on a friction joint.

This longest arm is a flat black-anodized aluminum link with more than one way to work. Fit the rosette hardware to either end and either face, reverse the arm end-for-end, remove a shoulder screw to expose a direct ¼"-20 female thread, or use the center M6 holes to bolt the arm flat to extrusion with T-nuts.

The result is one compact part that can act as a rosette-to-rosette bridge, a direct device bracket, or an extrusion-mounted cross-arm. It belongs to the Factory Line mounting path where short geometry and indexed service positions matter.

Rosette teeth turn an angle into a repeatable mechanical position: loosen the joint, move to another tooth, and return to the previous indexed position without re-aiming entirely by eye.

That makes the arm useful where a camera, light, or sensor may be removed for cleaning or service and then returned to the same discrete angle. The rosette controls angular position; the short straight arm controls offset. Cable strain relief and correct fastener torque still matter because indexing does not eliminate bending, vibration, or cable pull.

Use the Rosette 20 cm Extension Arm as a reversible rosette link, a direct ¼"-20 female endpoint, or a flat T-nut-mounted extrusion arm:

At each end, the rosette pattern and the ¼"-20 female route share the same center. Install the stainless shoulder screw to build an indexed rosette connection; remove it when a compatible device or adapter should thread directly into the arm. Those two routes use the same center and cannot be used simultaneously at one end.

Both ends are reversible and both faces are usable, so the arm can place the next component on the required side without a separate left-hand or right-hand SKU.

• Either end: both ends carry the shared rosette hole pattern.
• Either face: rosette hardware can mount on the front or back face of the plate.
• Direct thread: removing the shoulder screw exposes a ¼"-20 female hole at the rosette center.
• Flat to extrusion: M6 clearance holes along the body accept screws and T-nuts for 3030 / 4040 profile.
• Right-angle turn: add the KR-E3040-RS90 when the chain needs to leave the arm at 90°.

This arm provides a 200 mm / 7.9 in nominal rosette-center span and measures approximately 232 mm / 9.1 in overall; a released working-load figure has not yet been published.

• Nominal span: 200 mm / 7.9 in between rosette centers.
• Approximate overall length: 232 mm / 9.1 in from the confirmed drawing.
• Material and finish: black-anodized aluminum.
• Selection: Choose RSA20 only when the shorter arms cannot reach; its 200 mm span gives the largest offset, while the longer lever demands the most careful payload, vibration, and cable review.

Keep the support path as short as the application allows. Final usable load depends on mounting orientation, center of gravity, adjacent parts, screw engagement, vibration, and cable pull; validate the complete assembly before production release.

The Rosette 20 cm Extension Arm is best for the longest straight offset in the three-length family where a short indexed path is more useful than a long continuously adjustable arm.

• Camera or sensor offset from a 3030 / 4040 machine frame.
• Ring-light or bar-light positioning through a compatible VisionHolder rosette mount.
• Straight reach before or after an RS90 right-angle connector.
• Flat T-nut mounting on an extrusion face, with a rosette-connected setup at either end.
• Serviceable fixtures that need to return to a known tooth position after removal.

The current drawing defines one 20 cm extension-arm assembly with two ¼"-20 stainless-steel shoulder screws, one at each rosette center.

• Black-anodized aluminum 20 cm rosette extension arm.
• Two stainless-steel ¼"-20 shoulder screws for the rosette centers.

Rosette base nodes, RS90 connectors, camera/light/sensor holders, M6 screws, T-nuts, extrusion, devices, and cable-management parts are separate unless KUPO supplies them as part of a larger system kit.

Before ordering, confirm the 20 cm span is the shortest length that reaches, choose rosette or direct-thread use at each end, confirm the M6/T-nut route against your extrusion, and validate the complete payload under real vibration and cable conditions.

• The 20 cm name refers to rosette-center span, not the full 232 mm / 9.1 in overall length.
• Confirm mating rosette tooth form, center-screw engagement, tightening access, and torque.
• For direct mounting, the device or adapter must provide a compatible ¼"-20 male screw.
• For flat mounting, verify M6 hole alignment with the intended 3030 / 4040 slot and T-nut family.
• Add strain relief close to the payload so cable pull does not become an unplanned load.