What size screw does Dell Precision M4400 mobile workstation use?

M2 × 3 mm for M2 x 3 mm screws hold the display inverter, the WPAN/UWB card and the flash cache module; M2.5 × 5 mm for fan three M2.5 x 5 mm, thermal plate four M2.5 x 5 mm, system board five M2.5 x 5 mm (white arrows).

How long are the screws in Dell Precision M4400 mobile workstation?

The records range from 3 to 5 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M2 screw?

0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.

What screwdriver do I need for Dell Precision M4400 mobile workstation?

The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.

Can I use an imperial screw instead of M2?

No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Dell Precision M4400 mobile workstation?

TechSpareWarehouse (our own store) lists M2 x 3mm and M2.5 x 5mm, which match lengths in the records above.

Dell Precision M4400 mobile workstation screw size

M2 / M2.5 · 3 to 5 mm long

The screws used on Dell Precision M4400 mobile workstation are M2 and M2.5 in lengths from 3 to 5 mm.

There are 2 separate fitment records for it, including M2 x 3 mm screws hold the display inverter, the WPAN/UWB card and the flash cache module (M2) and fan three M2.5 x 5 mm, thermal plate four M2.5 x 5 mm, system board five M2.5 x 5 mm (whit (M2.5).

2 of the 2 records are marked confirmed, drawn from 1 source (pocitarna.cz).

An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.

Dell Precision M4400 mobile workstation 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
M2	3 mm	0.4 mm	not stated	not stated	M2 x 3 mm screws hold the display inverter, the WPAN/UWB card and the flash cache module	Confirmed
M2.5	5 mm	0.45 mm	not stated	not stated	Fan three M2.5 x 5 mm, thermal plate four M2.5 x 5 mm, system board five M2.5 x 5 mm (white arrows)	Confirmed

Fitment records and sources

M23 mmconfirmed

M2 x 3 mm screws hold the display inverter, the WPAN/UWB card and the flash cache module

pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6

Source

M2.55 mmconfirmed

Fan three M2.5 x 5 mm, thermal plate four M2.5 x 5 mm, system board five M2.5 x 5 mm (white arrows)

pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8

Source

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 M2 screw measures about 2 mm with calipers (usually a hair under). This device also uses M2.5, so measure each screw rather than assuming they match.
Pitch: 0.4 mm from one thread crest to the next (25 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 3–5 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard M2 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 M2 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M2 / M2.5

Framework 13 and 16 use five thread families (M1.2 to M2.5) with overlapping lengths; buy Framework's own fastener kit rather than generic M2 screws.
The standard M.2 SSD screw is M2 x 3mm, but some laptops and handhelds use non-standard lengths or head shapes.
Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
M2.5 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.

Pitch gauge · Screw size finder · Torque guide

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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The same screw also fits

Devices whose records share a thread with Dell Precision M4400 mobile workstation, closest length match first.

Lenovo ThinkPad P51 also M2 × 3 mm
Acer Aspire 5741G also M2 × 3 mm
Lenovo ideapad 330-15ICH also M2 × 3 mm
Dell Inspiron 15 7591 2-in-1 also M2 × 3 mm
HP Envy x360 m6 also M2 × 3 mm
Lenovo ThinkPad P52 also M2 × 3 mm
Lenovo ThinkPad T15g Gen 2 also M2 × 3 mm
Lenovo ideapad 330-17ICH also M2 × 3 mm

Questions about Dell Precision M4400 mobile workstation screws

What size screw does Dell Precision M4400 mobile workstation use?: M2 × 3 mm for M2 x 3 mm screws hold the display inverter, the WPAN/UWB card and the flash cache module; M2.5 × 5 mm for fan three M2.5 x 5 mm, thermal plate four M2.5 x 5 mm, system board five M2.5 x 5 mm (white arrows).
How long are the screws in Dell Precision M4400 mobile workstation?: The records range from 3 to 5 mm depending on the position, so match each screw to its own hole.
What is the thread pitch of an M2 screw?: 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
What screwdriver do I need for Dell Precision M4400 mobile workstation?: The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
Can I use an imperial screw instead of M2?: No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Dell Precision M4400 mobile workstation?: TechSpareWarehouse (our own store) lists M2 x 3mm and M2.5 x 5mm, which match lengths in the records above.

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