Lenovo IdeaPad S400 Touch screw size

Lenovo IdeaPad S400 Touch 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: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
5. The records span 2–5 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 IdeaPad S400 Touch, closest length match first.

• HP Chromebook™ x360 11 G4 EE also M2 × 2 mm
• Dell Latitude 3189 2-in-1 also M2 × 3 mm
• Lenovo IdeaPad 14m 5G 2021 DM also M2.5 × 5 mm
• Dell Pro 13 Premium PA13250 also M2 × 2 mm
• Lenovo B4400 also M2 × 3 mm
• Dell Inspiron 14 3465 also M2 × 2 mm
• HP nc6110 also M2 × 2 mm
• HP EliteBook 640 G11 also M2 × 3 mm

Questions about Lenovo IdeaPad S400 Touch screws

What size screw does Lenovo IdeaPad S400 Touch use?

M2 × 2 mm for display (qty 1, flat, black); M2 × 2 mm for speaker (qty 4, flat, black); M2 × 3 mm for I/O board (qty 2, flat, silver); M2 × 3 mm for battery (qty 3, flat, silver); M2 × 3 mm for fan (qty 6, flat, silver); M2 × 3 mm for hard drive (qty 2, flat, silver); M2 × 3 mm for keyboard (qty 2, flat, silver); M2 × 3 mm for system board (qty 5, flat, silver); M2 × 3 mm for unspecified (qty 1, flat, black); M2 × 3 mm for wireless card (qty 1, flat, silver); M2 × 5 mm for fan (qty 2, flat, silver); M2.5 × 5 mm for display (qty 3, flat, black); M3 × 3 mm for hard drive (qty 4, flat, silver).

How long are the screws in Lenovo IdeaPad S400 Touch?

The records range from 2 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 Lenovo IdeaPad S400 Touch?

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 IdeaPad S400 Touch?

TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 3mm and M2 x 5mm, which match lengths in the records above.