Choosing a Monitor Arm: Desk Clamp or Free-Standing Base?

Desk clamp or free-standing base - which fits better?

Monitor arms attach in two main ways: a desk clamp on the rear edge of the tabletop or a grommet mount through a drilled hole. Both clear the desk surface, since the classic monitor stand is removed. A separate free-standing base is used only where the tabletop may not be clamped or drilled.

The desk clamp is the most flexible option because it can be repositioned without tools and leaves no permanent marks. It does require a solid, overhanging edge of sufficient thickness. The grommet mount sits rock-solid and suits heavy dual arms, but it needs a hole in the worktop.

• Desk clamp: tool-free repositioning, no drilling, ideal for height-adjustable desks.
• Grommet mount: maximum stability, for heavy arms and dual monitors.
• Free-standing base: no work on the tabletop, but it occupies footprint.
• Wall mount: an alternative when desk depth is limited.

How do VESA pattern and load rating work together?

The interface between monitor and arm is standardised: the VESA standard (MIS) defines the spacing of the four screw holes on the back. The most common are 75 x 75 mm for small screens and 100 x 100 mm for standard monitors. Large displays use 200 x 100 or 200 x 200 mm.

Equally important is the arm's load range. Gas springs and constant-force springs only hold the monitor floating in any position when the weight sits within the stated window. Too light, and the arm drifts upward; too heavy, and it sags down.

How do I set up the monitor ergonomically?

Per DIN EN ISO 9241, the top line of the screen belongs at or just below eye level so the gaze falls slightly downward. The viewing distance is roughly 50 to 80 cm depending on the diagonal. An adjustable arm allows exactly this fine tuning for any body height.

• Height: top text line at eye level, head stays upright.
• Tilt: 10 to 20 degrees back to reduce reflections.
• Distance: about an arm's length, roughly 50 - 80 cm to the eye.
• Rotation: screen perpendicular to the window against glare.

What makes a monitor arm ESD-safe?

At electronics workstations the mount must not form an insulated surface that charges up. An ESD-safe monitor arm is made of dissipatively coated or anodised metal and is bonded through the workstation to the common ground point. Charges then dissipate in a controlled way instead of collecting on painted plastic parts.

Under DIN EN 61340‑5‑1 the mount counts as EPA equipment: its resistance to ground should be below 10⁹ Ω. In practice that means bare contact points at the clamp, no insulating powder coat at the grounding interface and a defined connection to the desk's ground network.

Frequently asked questions