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VESA mounting is supposed to be universal — and mostly is, once you understand the pattern sizes, screw specs, and weight math. Here's how to match your monitor to the right mount and handle the exceptions.
VESA (Video Electronics Standards Association) created the FDMI (Flat Display Mounting Interface) specification to standardize how monitors attach to arms, stands, and wall brackets. The standard defines the bolt hole pattern, screw type, and the weight and size classes that each pattern supports. When a monitor and a mount both comply with the same VESA pattern, they're physically compatible.
The pattern is expressed as two numbers — the horizontal and vertical distance between bolt holes in millimeters. A monitor with a 100x100 VESA pattern has four M4-threaded holes arranged in a 100mm square on the back panel. A mount compatible with 100x100 has a plate with matching holes. Attach the plate, tighten the screws, and the monitor hangs from the arm.
Found on smaller monitors — typically 19 to 23 inches. Less common in current production but still appears on compact office displays and portable monitors. Many monitor arms include both 75x75 and 100x100 hole sets on their mounting plate for backward compatibility.
The dominant pattern for 24- to 32-inch monitors. The vast majority of desktop monitor arms and wall mounts are built around 100x100. If you're buying a mount for a standard desktop display, this is almost certainly what you need.
Used on larger monitors — 32 inches and above — and some ultrawide panels. The wider bolt spacing distributes weight more evenly across a larger panel back. Mounts for 200x200 are physically larger and heavier-duty than 100x100 counterparts.
Some ultrawides and large-format displays use rectangular patterns where the horizontal and vertical spacing differ. The 200x100 pattern is common on 34-inch and wider ultrawide monitors. Mounting plates that support multiple patterns often use slotted holes or removable adapters to accommodate rectangular configurations.
Every monitor arm specifies a weight range — typically both a minimum and a maximum. The maximum is obvious: exceeding it risks structural failure, a dropped monitor, and potential injury or desk damage. The minimum matters too. Gas-spring arms balance the monitor's weight against internal spring pressure. If the monitor is too light, the arm can't hold it down in position — it floats upward or won't stay tilted at the desired angle.
Weigh the monitor without its stand. The spec sheet lists weight "with stand" and "without stand" separately — you need the without-stand number. Add the weight of any accessories permanently attached to the back (cable management clips, USB hubs mounted to the VESA plate) to stay within the arm's rated capacity.
Standard VESA screws are M4 (4mm diameter) for 75x75 and 100x100 patterns, and M6 for 200x200 and above. Thread pitch is M4x0.7 and M6x1.0 — standard metric coarse thread. Screw length depends on the depth of the monitor's VESA mounting recess. Most monitors need M4x10mm or M4x12mm screws. Monitors with deep recesses (common on curved panels) may need M4x14mm or longer.
Using screws that are too long is dangerous — they can push into the LCD panel or internal circuit boards and cause irreparable damage. If the screws included with your mount bottom out before the plate sits flush, switch to shorter screws rather than forcing them. If the screws are too short to engage the threads fully (at least four full turns), step up in length but never exceed the recess depth.
Some monitors — particularly consumer-grade displays from brands like Samsung and LG — ship without VESA mounting holes. They use proprietary stand attachment mechanisms instead. If you want to arm-mount one of these displays, a non-VESA adapter bracket is the solution.
These adapters work in one of two ways: some clamp to the monitor's original stand attachment point and extend outward to present VESA holes, while others grip the monitor body with adjustable arms or a cradle. The clamp-style adapters are sturdier and more stable. The cradle-style adapters work on monitors with no attachment point but add bulk and may interfere with cable access.
When shopping for a non-VESA adapter, match it to your specific monitor model. Generic adapters exist but sizing tolerances are tight — a bracket designed for a 27-inch Samsung may not grip a 27-inch LG correctly. Weight ratings on adapters tend to be more conservative than standard VESA mounts, so check that your monitor's weight falls comfortably within the adapter's range.
Monitor arms attach to desks in two ways: a C-clamp that grips the desk edge, or a grommet bolt that passes through a hole in the desk surface. C-clamps work on desks with edges between roughly 10mm and 80mm thick, depending on the clamp model. Grommet mounts require a pre-drilled hole but provide a more permanent and stable attachment.
The desk material determines whether the attachment is safe. Solid hardwood, metal frames, and thick laminated surfaces handle clamping pressure well. Thin particleboard, hollow-core desks, and glass surfaces are risky — the clamp can crush particleboard edges, crack glass, or deform hollow-core panels over time. A reinforcement plate (a steel plate that sits between the clamp and the desk surface) distributes the load and prevents localized damage on softer materials.
What VESA pattern does my monitor use?
Check the back of the monitor for four threaded holes arranged in a square or rectangle. Measure the horizontal and vertical distance between hole centers in millimeters. Common patterns are 75x75mm, 100x100mm, and 200x200mm. The spec sheet or manual will also list the VESA mount pattern.
Can I mount a monitor that has no VESA holes?
Yes, using a non-VESA adapter bracket. These adapters clamp to the monitor's stand attachment point or grip the monitor body with adjustable arms, then present standard VESA mounting holes for your arm or wall mount. Quality varies — choose an adapter rated for your monitor's weight and screen size.
What screw size do VESA mounts use?
The standard VESA screw is M4 for 75x75 and 100x100 patterns, and M6 for 200x200 and larger. Screw length depends on the depth of the monitor's mounting recess — typically M4x10mm or M4x12mm for standard monitors. Using screws that are too long can damage internal components.
Can my desk support a monitor arm?
Most monitor arms clamp to desk edges between 10mm and 80mm thick. The desk material matters more than thickness — solid wood and metal frames are fine, but particleboard or glass desks may crack under the clamping pressure and monitor weight. Use a reinforcement plate to distribute the load on softer desk materials.