Lenovo ThinkPad S420 screw size

Lenovo ThinkPad S420 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). If yours measures noticeably more or less, it is a different thread.
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 wafer (thin) head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
5. The records span 2–4 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 S420, closest length match first.

• Microsoft Surface Pro kickstand hinge also M2 × 3 mm
• HP Compaq NX4820 also M2 × 3 mm
• Lenovo ThinkPad Yoga 11e Chromebook 3rd Gen also M2 × 2 mm
• Dell Inspiron 13 7300 also M2 × 2 mm
• Lenovo ideapad 320L-14ISK also M2 × 3 mm
• HP 240 G4 also M2 × 2 mm
• Dell Alienware x17 R1 also M2 × 3 mm
• Lenovo YOGA 710-15IKB also M2 × 3 mm

Questions about Lenovo ThinkPad S420 screws

What size screw does Lenovo ThinkPad S420 use?

M2 × 2 mm for palm rest (qty 1, wafer, black); M2 × 3 mm for hard drive (qty 1, wafer, black); M2 × 3 mm for keyboard (qty 2, wafer, black); M2 × 3 mm for palm rest (qty 8, wafer, black); M2 × 3.5 mm for hinge (qty 4, wafer, black); M2 × 4 mm for card reader (qty 1, wafer, black); M2 × 4 mm for display (qty 2, wafer, black); M2 × 4 mm for display bezel (qty 2, wafer, black); M2 × 4 mm for fan (qty 2, wafer, black); M2 × 4 mm for hard drive (qty 4, flat, black); M2 × 4 mm for optical drive (qty 2, wafer, black); M2 × 4 mm for SSD (qty 2, wafer, black); M2 × 4 mm for system board (qty 3, wafer, black); M2 × 4 mm for wireless card (qty 2, wafer, black).

How long are the screws in Lenovo ThinkPad S420?

The records range from 2 to 4 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 S420?

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 S420?

TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 3mm and M2 x 4mm, which match lengths in the records above.