Lenovo ThinkPad S31 screw size

Lenovo ThinkPad S31 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. 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).
2. 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.
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 2.5–9 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 S31, closest length match first.

• HP ZBook 8 G1ak 14 (ZBook 8 G1a family; G1ah also M2 × 2.5 mm
• Lenovo V110-15ISK also M2 × 4 mm
• HP EliteBook 8440w also M2 × 4 mm
• Lenovo ThinkPad T14s Gen 6 Snapdragon also M2.5 × 4 mm
• Lenovo ThinkPad S431 also M2 × 2.5 mm
• Lenovo ideapad 510-15IKB also M2.5 × 4 mm
• Toshiba Satellite 2400 also M2 × 4 mm
• Lenovo G480 also M2.5 × 4 mm

Questions about Lenovo ThinkPad S31 screws

What size screw does Lenovo ThinkPad S31 use?

M2 × 2.5 mm for palm rest (qty 3, flat, silver); M2 × 2.5 mm for unspecified (qty 2, flat, silver); M2 × 4 mm for display (qty 1, flat, black); M2 × 4 mm for hard drive (qty 1, flat, black); M2 × 4 mm for speaker (qty 4, flat, black); M2 × 4 mm for system board (qty 1, flat, black); M2 × 4 mm for unspecified (qty 2, flat, black); M2 × 7 mm for fan (qty 3, flat, black); M2 × 7 mm for keyboard (qty 4, flat, black); M2 × 7 mm for unspecified (qty 2, flat, black); M2 × 9 mm for fan (qty 3, flat, black); M2.5 × 3 mm for display back cover (qty 2, flat, black); M2.5 × 3 mm for display bezel (qty 4, flat, black); M2.5 × 4 mm for display (qty 4, flat, silver); M2.5 × 5 mm for hinge (qty 3, flat, bla.

How long are the screws in Lenovo ThinkPad S31?

The records range from 2.5 to 9 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 S31?

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 S31?

TechSpareWarehouse (our own store) lists M2 x 2.5mm, M2 x 4mm and M2.5 x 3mm, which match lengths in the records above.