Monitor arms (Ergotron LX and generic) screw size
M4 · 10 to 20 mm long
Our records put Monitor arms (Ergotron LX and generic) on M4 screws in lengths from 10 to 20 mm.
The record covers ship with M4x10/12/15/20 sets for 75/100 VESA.
This entry is marked confirmed and comes from ergotron.com.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Monitor arms (Ergotron LX and generic) screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M4 | 10–20 mm | 0.7 mm | not stated | not stated | ship with M4x10/12/15/20 sets for 75/100 VESA | Confirmed |
Fitment records and sources
ship with M4x10/12/15/20 sets for 75/100 VESA
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- VESA holes are threaded inserts in the back cover; if a screw stops early, back it out rather than forcing it, because a bottomed-out screw can crack the panel housing.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 10–20 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M4 heads take PH2 for Phillips and T20 for Torx, and a 3 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- TV mount screw size follows the VESA pattern, not the brand — the same maker's small and large sets need M4, M6 or M8.
- VESA fixes the hole pattern and max thread depth, not screw length — length depends on the panel back and any spacers.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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M4 x 12mm Black Wafer Head Chainsaw & Cut-off Saw Screws for STIHL MS 460, MS 362, TS480i & TS500i (IS-M4x12) – 10-Pack Replacement
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M4 x 12mm Black Wafer Head Monitor VESA, Neck & Stand Screws for Dell UltraSharp U4320Q & Sceptre Monitors – 8-Pack Replacement
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M4 x 20mm Black Wafer Head Pan Screw Screws for Honda Accord 1980-1989 & Civic 1978-1979 (93500-04020) – 10-Pack Replacement
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M4 x 20mm Black Wafer Head Phillips Machine Screws (8mm Thin Flat Head) for Monitor VESA Brackets & PC Cases
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Devices whose records share a thread with Monitor arms (Ergotron LX and generic), closest length match first.
- Dell P1914S also M4 × 10 mm
- LG 65LW6500 also M4 × 12 mm
- LG 42LM6400 also M4 × 20 mm
- ASUS VP229HF also M4 × 10 mm
- Raspberry Pi VESA adapter plates also M4 × 10 mm
- Dell P1913S also M4 × 10 mm
- Dell S2421HGF also M4 × 10 mm
- Dell S2417DG also M4 × 10 mm
Questions about Monitor arms (Ergotron LX and generic) screws
- What size screw does Monitor arms (Ergotron LX and generic) use?
- M4 × 10–20 mm for ship with M4x10/12/15/20 sets for 75/100 VESA.
- How long are the screws in Monitor arms (Ergotron LX and generic)?
- The records range from 10 to 20 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for Monitor arms (Ergotron LX and generic)?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.