Dell Precision 5490 screw size
M1.4 / M1.6 / M2 / M2.5 · 1.2 to 5 mm long
If you are replacing a screw on Dell Precision 5490, the thread is M1.4, M1.6, M2 and M2.5 in lengths from 1.2 to 5 mm.
There are 16 separate fitment records for it, including unspecified (qty 2) (M1.4), wireless card (qty 4) (M1.4) and display (qty 4, Torx T5) (M1.4), plus 13 more in the table below.
Head and drive, as the sources state them: Torx T5 drive.
16 of the 16 records are marked confirmed, drawn from 1 source (dell.com).
An M1.4 screw is 1.4 mm in diameter with a 0.3 mm pitch, tapped with a 1.1 mm drill; imperial look-alike: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix.
Dell Precision 5490 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 |
|---|---|---|---|---|---|---|
| M1.4 | 1.2 mm | 0.3 mm | not stated | not stated | Unspecified (qty 2) | Confirmed |
| M1.4 | 2.5 mm | 0.3 mm | not stated | not stated | Wireless card (qty 4) | Confirmed |
| M1.4 | 4 mm | 0.3 mm | not stated | Torx T5 | Display (qty 4, Torx T5) | Confirmed |
| M1.4 | 4 mm | 0.3 mm | not stated | Torx T5 | System board (qty 4, Torx T5) | Confirmed |
| M1.6 | 1.7 mm | 0.35 mm | not stated | not stated | Card reader (qty 2) | Confirmed |
| M1.6 | 1.8 mm | 0.35 mm | not stated | not stated | Speaker (qty 2) | Confirmed |
| M1.6 | 2 mm | 0.35 mm | not stated | not stated | Power button (qty 3) | Confirmed |
| M1.6 | 2.3 mm | 0.35 mm | not stated | not stated | System board (qty 1) | Confirmed |
| M1.6 | 3 mm | 0.35 mm | not stated | not stated | Unspecified (qty 1) | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | SSD (qty 2) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | Torx T5 | Base cover (qty 8, Torx T5) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Battery (qty 5) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Fan (qty 2) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | System board (qty 6) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Unspecified (qty 3) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Display (qty 6) | Confirmed |
Fitment records and sources
Unspecified (qty 2)
pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3
Wireless card (qty 4)
pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3
Display (qty 4, Torx T5)
pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3
System board (qty 4, Torx T5)
pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3
Card reader (qty 2)
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Speaker (qty 2)
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Power button (qty 3)
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
System board (qty 1)
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Unspecified (qty 1)
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
SSD (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 8, Torx T5)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery (qty 5)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Fan (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
System board (qty 6)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 3)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
- Diameter: across the threads an M1.4 screw measures about 1.4 mm with calipers (usually a hair under). This device also uses M1.6 / M2 / M2.5, so measure each screw rather than assuming they match.
- Pitch: 0.3 mm from one thread crest to the next (33.33 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 1.2–5 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Torx T5 drive. For comparison, standard M1.4 heads take PH000 / PH00 (Phillips) or T2–T3 (Torx), or a 1.3 mm hex key.
- Tightening: no device-specific torque is published in these records. The site's general figure for M1.4 is about 8-12 N·cm into metal threads and 4-7 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M1.4 / M1.6 / M2 / M2.5
- Dental implant screws (M1.4/M1.6) are proprietary per system — Bredent, NeoBiotech, Nobel and Straumann are not interchangeable even at the same nominal size.
- M1.6 is the most common laptop-internal micro screw after M2 — Dell XPS keyboards specifically call out M1.6 x 1.5mm, and generic M2 substitutes strip the bracket.
- M.2 SSD mounting screws (M2 x 3mm) are frequently mislabeled generically as 'M.2 screws' which can be confused with the M2 metric thread designation — they do coincide numerically here but are conceptually distinct (M.2 = card format, M2 = thread size).
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
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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M2 x 2mm Phillips Flat Head Screw for HP EliteBook 840/846 G6 Laptop Repair - Pack of 100 Black
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10x M2 x 3mm Phillips Screws for Lenovo ThinkPad X131e Chromebook WiFi SSD
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ASUS ROG Strix G15 G513R Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Dell Precision 5490, closest length match first.
- Lenovo E41-15 also M2 × 2 mm
- Dell Inspiron 14 5410 2-in-1 also M1.6 × 2 mm
- Lenovo Chromebook C340-15 also M2 × 3 mm
- Dell XPS / Razer Blade bottom cover screw kit also M2 × 3 mm
- Dell Inspiron 13 7378 2-in-1 also M2 × 2 mm
- Lenovo ThinkPad E125 also M2 × 3 mm
- HP ProBook 455 G1 also M2 × 2 mm
- Lenovo ThinkPad L460 also M2 × 3 mm
Questions about Dell Precision 5490 screws
- What size screw does Dell Precision 5490 use?
- M1.4 × 1.2 mm for unspecified (qty 2); M1.4 × 2.5 mm for wireless card (qty 4); M1.4 × 4 mm for display (qty 4, Torx T5); M1.4 × 4 mm for system board (qty 4, Torx T5); M1.6 × 1.7 mm for card reader (qty 2); M1.6 × 1.8 mm for speaker (qty 2); M1.6 × 2 mm for power button (qty 3); M1.6 × 2.3 mm for system board (qty 1); M1.6 × 3 mm for unspecified (qty 1); M2 × 2 mm for SSD (qty 2); M2 × 3 mm for base cover (qty 8, Torx T5); M2 × 4 mm for battery (qty 5); M2 × 4 mm for fan (qty 2); M2 × 4 mm for system board (qty 6); M2 × 4 mm for unspecified (qty 3); M2.5 × 5 mm for display (qty 6).
- How long are the screws in Dell Precision 5490?
- The records range from 1.2 to 5 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M1.4 screw?
- 0.3 mm (coarse), which is the standard pitch for M1.4 machine screws. The tap drill is 1.1 mm and the normal clearance hole is 1.6 mm.
- What screwdriver do I need for Dell Precision 5490?
- The source lists a Torx T5 drive. Standard M1.4 heads otherwise take PH000 / PH00 (Phillips) or T2–T3 (Torx), or a 1.3 mm hex key.
- Can I use an imperial screw instead of M1.4?
- No. Imperial look-alike: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix. Use a true M1.4 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Dell Precision 5490?
- TechSpareWarehouse (our own store) lists M1.6 x 3mm, M2 x 2mm and M2 x 3mm, which match lengths in the records above.