Lenovo ThinkPad 390X screw size

Lenovo ThinkPad 390X 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.

How to check the screw before you buy

1. A screw that is even 1 mm too long in a laptop base can push into the keyboard, battery or a board trace, so match the length position by position.
2. Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). This device also uses M2.5 / M3, so measure each screw rather than assuming they match.
3. 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.
4. Length: for pan head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
5. The records span 4–18 mm, which means different positions take different lengths — match each hole to its own screw.
6. 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.
7. 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.

Pitch gauge · Screw size finder · Torque guide

More in Laptops & PCs

The same screw also fits

Devices whose records share a thread with Lenovo ThinkPad 390X, closest length match first.

• Acer TravelMate 5320 also M2 × 4 mm
• Lenovo ThinkPad X250 also M2 × 4 mm
• HP EliteBook 640 14 inch G9 also M2 × 4 mm
• Lenovo Chromebook C340 also M2 × 4 mm
• Dell Latitude 5580 also M2 × 5 mm
• Dell Inspiron 15 7586 also M2 × 5 mm
• Dell Latitude 5480 also M2 × 5 mm
• Dell Precision 7540 also M2 × 5 mm

Questions about Lenovo ThinkPad 390X screws

What size screw does Lenovo ThinkPad 390X use?

M2 × 10 mm for display (qty 1, pan); M2 × 10 mm for heat sink (qty 1, pan); M2 × 14 mm for unspecified (qty 2, flat); M2 × 18 mm for heat sink (qty 3, pan); M2 × 18 mm for palm rest (qty 3, pan); M2 × 18 mm for unspecified (qty 2, pan); M2 × 4 mm for LED board (qty 1, flat); M2 × 4 mm for fan (qty 1, flat); M2 × 4 mm for heat sink (qty 4, flat); M2 × 4 mm for keyboard (qty 2, flat); M2 × 4 mm for palm rest (qty 1, flat); M2 × 4 mm for speaker (qty 5, flat); M2 × 4 mm for system board (qty 6, flat); M2 × 4 mm for unspecified (qty 2, flat); M2 × 5 mm for keyboard (qty 28, pan); M2.5 × 4 mm for optical drive (qty 4, flat); M2.5 × 4 mm for system board (qty 4, flat); M2.5 × 5 mm for unspecified .

How long are the screws in Lenovo ThinkPad 390X?

The records range from 4 to 18 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 Lenovo ThinkPad 390X?

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 Lenovo ThinkPad 390X?

TechSpareWarehouse (our own store) lists M2 x 4mm, M2 x 5mm and M2.5 x 4mm, which match lengths in the records above.