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Choosing an Ergotron monitor arm often starts with the wrong question — screen size. The real compatibility factors are weight range, panel depth, and how many displays need to move independently. A 49-inch ultrawide is not the same problem as a 24-inch 1080p panel, and a light monitor can be just as problematic on a heavy-duty arm as a heavy one on a light-duty arm.
Ergotron's current desk-mount catalog now spans seven primary families: NX, LX, LX Pro, MXV, MX, HX, and TRACE, plus dual and multi-monitor configurations. The original LX remains actively sold alongside the newer LX Pro, and the HX family splits into three pivot variants designed for different curved-display depths. That breadth means the decision is rarely "LX or HX" anymore.
This guide maps the full active range and explains when each arm makes sense. You'll find a decision matrix built around weight, depth, and movement rather than marketing names, together with the specific configurations that solve real desk-layout problems.
If you're outfitting a single desk, a dual-screen workflow, or a deep curved ultrawide, this guide helps you choose without overspending on capacity or living with an arm that doesn't hold position.
Ergotron's Monitor Arm Philosophy — Compatibility Before Screen Size
Ergotron builds its monitor arms around a few mechanical realities. The first is that every spring or gas mechanism has both a minimum and a maximum load. A display that falls below the minimum will not stay where you put it, while one above the maximum will slowly drift or strain the tilt pivot.
The second reality is that depth and curvature matter as much as scale weight. A strongly curved panel moves its center of gravity farther away from the VESA plate, increasing the torque the pivot must resist. That's why Ergotron maintains separate HX pivot options: standard, Heavy-Duty, and Very Heavy-Duty. A deep 57-inch curved monitor belongs on a VHD pivot, while many 49-inch 1000R-class monitors fit the HD range. For a deeper dive into VESA and mount compatibility, see our VESA monitor arms explained guide.
The third factor is movement geometry. An elbow-style arm can push a deep display forward on a shallow desk, while a flat-plane arm such as TRACE keeps the screen in a more consistent plane during lateral travel. Short-reach arms like the NX trade extension for a compact footprint behind the monitor.
You should therefore choose an arm by asking four questions in order: How heavy is each monitor? How deep or curved is it? How far must it travel? Do the screens need to move independently?
Entry Tier: Ergotron NX — Short-Reach Essential
The NX is Ergotron's current entry-level single-monitor arm, launched in 2023. It supports displays up to 34 inches and up to 17.6 lb, with a maximum extension of approximately 14.5 inches. That shorter reach is the defining trait — the arm stays close to the pole instead of swinging a long elbow behind the desk.
Key specifications:
- Display size: up to 34 inches
- Weight range: up to 17.6 lb / 8 kg
- Maximum extension: approximately 14.5 in / 36.7 cm
- Tilt: approximately 35°
- Pan: 180°
- Display rotation: 360°
- VESA: 75 × 75 and 100 × 100 mm
- Desk-clamp installation with integrated cable management
- Warranty: 5 years
The NX works well for a standard 27-inch monitor when you want the arm pushed flat against the pole without a protruding elbow. Owners frequently mention this behavior in landscape orientation, though the arm can become more visible when the screen is rotated vertically. It is not designed for deep reach or heavy panels; if your desk is shallow and you don't need the display pulled far forward, the NX is a pragmatic budget option.
Core Lineup: LX and LX Pro — The Flexible Every-Day Arms
Ergotron's LX family has long been the reference point for adjustable monitor arms, and it remains current alongside the newer LX Pro platform. Both support single, dual, stacking, and tall-pole configurations, but the two generations differ in feel and ecosystem.
Legacy LX Desk Monitor Arm
The original LX supports displays up to approximately 34 inches and a weight range of 7–25 lb. It offers 13 inches of lift, about 25 inches of extension, and 360° rotation. The established joint design has roomier cable channels than the newer platform, and many long-time users prefer its perceived rigidity.
Key specifications:
- Display size: up to approximately 34 inches
- Weight range: approximately 7–25 lb / 3.2–11.3 kg
- Lift: 13 in / 33 cm
- Maximum extension: approximately 25 in
- Tilt: approximately +70° / −5°
- Pan and rotation: 360°
- VESA: 75/100
- Warranty: 10 years
LX Pro Desk Monitor Arm
Introduced in the Americas in January 2025, the LX Pro is the next-generation platform. It lowers the minimum load to 4 lb while retaining a 22 lb maximum, adds a configurable 180° rotation stop, includes a tension indicator, and uses a detachable monitor head. Its cable channels are smaller than the legacy design, and some owners report slightly more play at the removable joint, but the 10-year warranty and 10,000-cycle testing remain.
Key specifications:
- Display size: up to 34 inches
- Weight range: 4–22 lb / 1.8–10 kg
- Lift: 13 in / 33 cm
- Maximum extension: approximately 25–25.8 in
- Tilt: 85° total, approximately +70° / −15°
- Rotation stop: configurable 180°
- VESA: 75/100
- Warranty: 10 years
The LX Pro is not interoperable with legacy LX components, so you cannot mix generations on the same pole. That matters if you plan to expand later.
Tall-Pole Variants
Both the LX and LX Pro families offer tall-pole versions that add roughly 30 cm of vertical mounting height. The taller pole changes the mounting envelope but does not increase the arm's individual weight limit. These are useful for unusually high screen placement or stacked configurations where pole height is the limiting factor rather than arm lift.
- LX Pro Tall Pole: search link below
- LX Tall Pole: Check Price on Amazon
Check Price on Amazon — LX Pro Tall Pole
Slim Alternative: MXV — Low Profile and Constant Force
The MXV is Ergotron's slimmer, lower-profile alternative to the LX. It targets the same 34-inch display class but with a weight range of 7–20 lb and a more compact clamp. The arm trades some maximum reach for a visibly slimmer profile, which appeals on desks where the mount itself is part of the aesthetic.
Key specifications:
- Display size: up to 34 inches
- Weight range: 7–20 lb / 3.2–9.1 kg
- Lift: 13 in / 33 cm
- Maximum extension: approximately 22.2 in / 56 cm
- Tilt: up to approximately ±90°
- Pan: approximately 180° at pivot, arm movement up to 360°
- VESA: 75/100
- Warranty: 10 years
The MXV is a useful corrective to the "always buy HX" instinct. A lighter monitor that cannot tension correctly on HX is often better served by MXV or LX. It also ships largely assembled and includes a rotation stop.
MXV Dual uses a shared base with two MXV arms. It supports two displays up to about 24 inches each, 7–20 lb per monitor, and a combined capacity of approximately 40 lb. The V-shaped architecture keeps the footprint compact.
Compact Heavy-Duty: MX — High Load, Short Envelope
The MX is an older but still current arm designed for heavy displays in a compact movement envelope. It carries 14–30 lb but with only about 5 inches of lift and 16.7 inches of extension — dramatically less vertical travel than LX or MXV.
Key specifications:
- Display size: approximately ≤30 inches
- Weight range: approximately 14–30 lb
- Lift: approximately 5 in (much less than LX/MXV)
- Maximum extension: approximately 16.7 in
- Tilt: approximately +75° / −5°
- Pan: 360°
- Rotation: approximately 90°
- VESA: broader MIS-D/E/F support than 75/100-only arms
- Warranty: 10 years
The MX is best understood as a compact high-load specialty arm, not a cheaper HX. It suits heavy conventional displays that do not need long reach or large height adjustment. Buyers expecting LX-like flexibility on a 30 lb panel will find the short lift limiting.
Heavy-Duty HX: Standard, HD, and VHD Pivots for Deep Curved Displays
The HX is Ergotron's heavy-monitor arm, but it is really three distinct configurations. The standard HX supports 20–42 lb and up to 49 inches. The HD Pivot adds a heavier tilt mechanism for deep curved displays. The VHD Pivot, launched in October 2024, targets extreme-depth curved monitors like the 57-inch Samsung Odyssey Neo G9 class.
Standard HX
- Display guidance: up to 49 inches standard configuration
- Weight range: 20–42 lb / 9.1–19.1 kg
- Lift: 11.5 in
- Extension: approximately 23.6 in
- Tilt: 75° total, +70° / −5°
- VESA: 75 × 75, 100 × 100, 200 × 100, 200 × 200 mm
- 10,000-cycle tested; BIFMA level 2
- Warranty: 10 years
The standard HX is not the right arm for a light display. A monitor below the minimum spring load will not hold position. Owners of roughly 7 lb 27-inch monitors have moved to MXV or LX for this reason.
HX with HD Pivot
The Heavy-Duty Tilt Pivot is intended for heavy and deep curved displays, including many 49-inch 1000R-class monitors. Ergotron's guidance covers approximately 28–42 lb with display depth around 6–12 inches. Tilt range narrows to about +15° / −5° compared with the standard HX.
- Display guidance: up to approximately 49 inches
- Weight envelope: approximately 28–42 lb for deep curved use
- Depth envelope: approximately 6–12 in
- VESA: 75/100 at the HD pivot
- Warranty: 10 years
This is the commonly recommended setup for 49-inch Samsung Odyssey G9-class displays.
HX with VHD Pivot
The Very Heavy-Duty Pivot exists for extreme-depth curved monitors, most notably the 57-inch Odyssey Neo G9 class. Its stated envelope reaches approximately 28.7–37.5 lb with display depth from 9.1 to 13.8 inches. Tilt is limited to about +20° / −5°, and rotation is restricted because extreme-curved panels are not intended for portrait use.
- Display guidance: up to approximately 57 inches
- Weight envelope: approximately 28.7–37.5 lb
- Depth envelope: approximately 9.1–13.8 in
- Lift: 11.5 in
- Extension: approximately 23.6–25 in
- VESA: 75/100 at pivot
- Warranty: 10 years
Owners of substantially deeper or heavier 57-inch monitors have reported that the HD Pivot can still sag. That scenario is precisely what VHD was introduced to solve.
HX Dual and HX Triple
The dual HX is not two standard HX arms. Its per-display range drops to 5–17.5 lb with a combined capacity of 10–35 lb, making it suitable for two moderately heavy conventional monitors rather than two 42 lb ultrawides.
- HX Dual: up to approximately 32 inches per display
- HX Triple: per-display range 2–10.2 lb, max outside width about 26 inches, typical displays ≤27 inches
The HX Triple uses a much lighter per-monitor envelope despite the HX name. Three 27-inch screens work; three heavy ultrawides do not.
Check Price on Amazon — HX Dual
Check Price on Amazon — HX Triple
TRACE: The Movement-Focused Arm
The TRACE, launched in June 2021, is designed around flat-plane movement rather than maximum load. Its "home position" concept lets the arm track laterally and in depth with fewer separate joint corrections than a conventional elbow arm. Owners often describe it as the reason to buy the product, and some report reduced perceived wobble compared with the LX.
Key specifications:
- Display size: up to approximately 38 inches
- Weight range: 6.5–21.5 lb / 3–9.75 kg
- Lift: 11 in
- Maximum extension: approximately 20 in
- Pan: approximately 240°
- Rotation: 360°
- VESA: 75/100
- 15,000-cycle testing
- Warranty: 15 years — the longest in Ergotron's primary desk-arm lines
The TRACE is not a "better LX" for everyone. If you rarely reposition your monitor, the higher price makes little sense. Its strongest use case is frequent movement of one or two conventional displays while keeping the viewing plane consistent.
TRACE Dual extends the flat-plane system to two displays with linked geometry that keeps both screens in a consistent plane during horizontal and depth movement. Typical guidance is for displays up to about 27 inches.
Multi-Monitor and Specialty Configurations
Beyond single arms, Ergotron's desk-mount range includes several multi-monitor and specialty formats worth mapping before you buy.
LX Pro Dual Direct and Dual Side-by-Side
The Dual Direct uses one bisected bow to hold two similar screens that largely travel together. It supports typical screens up to about 27 inches, with roughly 9.4 lb per display. Tilt at the displays is around 30° total. It keeps matched screens aligned but is less suited to mismatched sizes, portrait/landscape mixes, or independently changing heights.
The LX Pro Dual Side-by-Side uses two fully independent LX Pro arms from a shared base. Each arm supports 4–20 lb, with up to 40 lb combined and full independent depth, angle, and rotation adjustment.
- Dual Direct: Check Price on Amazon
- Dual Side-by-Side: Check Price on Amazon
Legacy LX Dual Options
The original LX family also includes dual side-by-side, dual stacking, dual direct, and tall-pole stacking configurations. The LX Dual Side-by-Side uses independent arms with a shared base, while the LX Dual Direct uses a dual bow with a lighter per-monitor capacity of about 2–11 lb and is intended for matched screens that move as one unit.
- LX Dual Side-by-Side: Check Price on Amazon
- LX Dual Stacking: Check Price on Amazon
- LX Dual Stacking Tall Pole: Check Price on Amazon
- LX Dual Direct: Check Price on Amazon
LX Pro Triple and Quad
Ergotron sells modular bundles for three- and four-monitor setups using LX Pro arms and expansion hardware. For triple-monitor layouts, physical panel width and height often become the limiting factor before arm load does. Large bezel-less 27–32 inch displays can collide or exceed practical stacking geometry. For quad layouts, measure outside display dimensions, available pole height, and desk-edge clearance before purchase.
- LX Pro Triple: Check Price on Amazon
- LX Pro Quad: Check Price on Amazon
LX Sit-Stand Desk Arm
This is a specialized long-travel arm derived from the original LX. The standard version supports displays up to about 42 inches, 7–25 lb, 20 inches of vertical lift, and up to 33 inches of extension, folding to a roughly 4.5-inch profile. A heavy-duty variant reaches 46 inches and 14–30 lb. It exists for far greater vertical and forward travel than a normal LX, not simply higher load.
Wall-Mount Portfolio
Ergotron also sells wall-mounted versions of LX Pro, HX, MXV, MX, and TRACE arms. These eliminate desk-clamp concerns but make wall structure, stud location, and screen depth more important. Wall mounting is a separate category and not a direct replacement for desk arms in most setups. If you need wall mounting, verify structural requirements and use Ergotron's Wall Track system for hollow-wall installations where specified.
Check Price on Amazon — Wall Mounts
How to Choose: The Ergotron Decision Matrix
Use this matrix in order. Do not start with screen size.
Step 1 — Weigh each monitor.
- Under 8 lb / 3.6 kg: NX, LX Pro, MXV, LX, or TRACE — never HX.
- 7–20 lb / 3.2–9.1 kg: LX, LX Pro, MXV, or TRACE.
- 14–30 lb / 6.4–13.6 kg and compact reach: MX.
- 20–42 lb / 9.1–19.1 kg: standard HX.
Step 2 — Check depth and curvature.
- Flat or mild curve, depth under ~6 inches: standard HX works if weight is in range.
- Deep curved 49-inch class, depth ~6–12 inches: HX with HD Pivot.
- Extreme-depth 57-inch class, depth ~9.1–13.8 inches: HX with VHD Pivot.
- Lighter conventional display with shallow desk: NX or TRACE for flat-plane travel.
Step 3 — Determine motion needs.
- Rarely move the monitor: LX, LX Pro, MXV, or MX offer solid positioning at lower complexity.
- Frequent lateral movement with a consistent viewing plane: TRACE.
- Need tall placement with extra pole height: LX Tall Pole or LX Pro Tall Pole.
Step 4 — Decide independence.
- Two identical screens moving as one: Dual Direct.
- Two screens with independent depth, angle, or rotation: Dual Side-by-Side or two separate single arms.
- Vertical stacking: Dual Stacking, but check outside panel height. A pair of large monitors can meet weight limits yet be impossible to stack cleanly on the standard pole.
- Three or four displays: modular LX Pro bundles or HX Triple, with physical panel width/height measured before purchase.
Two practical cautions
- Do not buy HX merely because it is "stronger." A 7 lb monitor cannot balance the HX spring. Choose the arm whose weight range includes your actual display.
- Do not treat legacy LX as discontinued. It remains listed in the current US catalog alongside LX Pro. The choice between LX and LX Pro is a real one based on feel, cable routing, and ecosystem, not age.
Frequently Asked Questions
Q: Is the original Ergotron LX discontinued?
No. The original LX family is still listed in Ergotron's current US desk-mount catalog alongside the newer LX Pro. Some older LX SKUs have been retired, but the family itself remains available.
Q: Can any Ergotron arm hold a 49-inch ultrawide?
Not automatically. A 49-inch ultrawide may fit the screen-size guidance of the standard HX, but many 1000R-class curved panels of that size require the HD Pivot because of their depth and forward center of gravity. Check depth and weight together before buying.
Q: Is HX always better than LX or MXV?
No. HX is designed for heavy displays with a minimum load of about 20 lb. A light monitor below that minimum will not hold position. For monitors from roughly 7 to 20 lb, LX, LX Pro, MXV, or TRACE is the appropriate choice.
Q: Can I stack two monitors on an Ergotron arm?
Yes, Ergotron offers LX and LX Pro dual stacking arms. However, vertical stacking is limited by outside panel height and pole geometry, not just diagonal size and weight. Large monitors may individually meet the limits but still not stack cleanly.
Q: Do I need the VHD Pivot for a 57-inch Samsung Odyssey Neo G9?
Yes. The VHD Pivot was introduced specifically for extreme-depth curved monitors like the 57-inch Odyssey Neo G9 class. Owners of 57-inch screens have reported sag with the HD Pivot, which is exactly the scenario VHD addresses.
Q: Are two single arms better than one dual arm?
Often, yes, if your displays are wide or mismatched. Two separate single arms let you spread the clamp positions apart and adjust each display independently. A shared-pole dual arm is cleaner when the screens are matched and you want a single base footprint. For setups with mismatched sizes, see our guide on best dual monitor arms.
Q: Do Ergotron tall-pole versions increase weight capacity?
No. A taller pole changes the mounting height envelope but does not increase the arm's individual display weight limit. The same weight range applies to the standard and tall-pole versions of a given arm.
Conclusion
Ergotron's monitor-arm lineup is now a seven-family decision, not a two-model comparison. The right arm depends on weight floor and ceiling, panel depth and curvature, movement requirements, and whether multiple displays need to move independently. A light panel on an HX is just as wrong as a deep 57-inch curved panel on a standard pivot.
For most single-monitor desks with displays from 7 to 22 lb, the LX or LX Pro remains the sweet spot — choose LX Pro if you want the lower 4 lb minimum and rotation stop, or legacy LX if you prefer the older joint feel and roomier cable channels. MXV trades reach for a slimmer profile. NX works when short reach is enough. TRACE earns its premium only if you reposition the screen often. HX, HD, and VHD cover the heavy and curved classes, but never buy HX for a light monitor.
Before purchasing any multi-monitor configuration, measure the outside dimensions of your displays and the depth behind your desk. Stacking and triple/quad setups fail on geometry more often than on weight. And if you're buying used, match the exact part number rather than the family name.
For a clutter-free desk, pairing the right monitor arm with proper cable management and a desk mat makes the biggest visual difference. A monitor arm frees desk surface, but the remaining cabling and surface area still define the final setup.
