Lenovo ThinkPad T420s laptop screw size
M2 · 5 mm long
Lenovo ThinkPad T420s laptop takes M2 metric screws, 5 mm long.
Where it is used: flat-head, nylon-coated screw, torque 181 Nm (85 kgfcm), quantity 2, black.
Head and drive, as the source states them: flat / countersunk head.
This entry is marked confirmed and comes from manualowl.com.
For reference, M2 is 2 mm across the threads at 0.4 mm pitch. The imperial size people confuse it with: #2-56 UNC (2.18 mm) is close but not interchangeable.
Lenovo ThinkPad T420s laptop screw specifications
One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Torque | Where it goes | Status |
|---|---|---|---|---|---|---|---|
| M2 | 5 mm | 0.4 mm | Flat / countersunk | not stated | 181 Nm | Flat-head, nylon-coated screw, torque 181 Nm (85 kgfcm), quantity 2, blackthread-locking patch, black finish | Confirmed |
Fitment records and sources
Flat-head, nylon-coated screw, torque 181 Nm (85 kgfcm), quantity 2, black
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
How to check the screw before you buy
- 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.
- 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.
- 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.
- Length: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The record states 5 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- 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.
Common mix-ups with M2
- The standard M.2 SSD screw is M2 x 3mm, but some laptops and handhelds use non-standard lengths or head shapes.
- M2 (2.00mm, 0.4mm pitch) is NOT the same as #2-56 UNC (2.18mm) — close enough to cross-thread and strip if forced.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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Dell Latitude 5430 Replacement Screws Sold Individually – M2 x 2.5mm, M2 x 3mm, M2 x 5mm, M2.5 x 5mm Phillips Wafer Head, Black
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Devices whose records share a thread with Lenovo ThinkPad T420s laptop, closest length match first.
- Lenovo ThinkPad L580 also M2 × 5 mm
- Lenovo ThinkPad L14 Gen 2 also M2 × 5 mm
- Lenovo E51-80 also M2 × 5 mm
- Lenovo Y70-80 Touch also M2 × 5 mm
- Lenovo E40-80 also M2 × 5 mm
- Dell Vostro 16 5625 also M2 × 5 mm
- Lenovo M30-70 also M2 × 5 mm
- Lenovo ThinkPad L14 Gen 4 also M2 × 5 mm
Questions about Lenovo ThinkPad T420s laptop screws
- What size screw does Lenovo ThinkPad T420s laptop use?
- M2 × 5 mm for flat-head, nylon-coated screw, torque 181 Nm (85 kgfcm), quantity 2, black.
- How long are the screws in Lenovo ThinkPad T420s laptop?
- The record gives 5 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 laptop?
- 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.
- How tight should the M2 screw on Lenovo ThinkPad T420s laptop be?
- The source gives 181 Nm for flat-head, nylon-coated screw, torque 181 Nm (85 kgfcm), quantity 2, black.
- Where can I buy replacement screws for Lenovo ThinkPad T420s laptop?
- TechSpareWarehouse (our own store) lists M2 x 5mm, which matches the length in the records above.