Lenovo ThinkPad T420s screw size

Lenovo ThinkPad T420s 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 / 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 shoulder screw / binding head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
5. The records span 3–9 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 T420s, closest length match first.

• Acer Aspire 5332 also M2 × 3 mm
• Lenovo ThinkPad L13 Gen 5 also M2 × 4 mm
• Lenovo ideapad 320E-14IKB also M2 × 3 mm
• Dell Inspiron 14 7435 also M2 × 3 mm
• Lenovo B51-35 also M2 × 3 mm
• Dell Latitude 7340 also M2 × 3 mm
• Lenovo ThinkPad P15 Gen 2 also M2 × 3 mm
• HP EliteBook 855 G8 also M2 × 4 mm

Questions about Lenovo ThinkPad T420s screws

What size screw does Lenovo ThinkPad T420s use?

M2 × 3 mm for I/O board (qty 1, small-head, silver); M2 × 3 mm for camera (qty 1, small-head, silver); M2 × 3 mm for card reader (qty 5, flat, silver); M2 × 3 mm for DC-in (qty 1, shoulder, silver); M2 × 3 mm for display (qty 4, small-head, silver); M2 × 3 mm for palm rest (qty 1, flat, silver); M2 × 3 mm for speaker (qty 4, flat, silver); M2 × 3 mm for unspecified (qty 3, small-head,flat, silver); M2 × 3 mm for wireless card (qty 3, small-head,binding,flat, silver); M2 × 4 mm for unspecified (qty 1, flat, black); M2 × 4 mm for wireless card (qty 1, flat, black); M2 × 5 mm for display bezel (qty 2, shoulder, black); M2 × 5 mm for hinge (qty 2, binding, black); M2 × 5 mm for keyboard (qty 2, .

How long are the screws in Lenovo ThinkPad T420s?

The records range from 3 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 T420s?

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 T420s?

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