Lenovo ThinkPad E550 screw size

Lenovo ThinkPad E550 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: 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 2.4–8 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 E550, closest length match first.

• Acer Aspire 8730Z also M2 × 3 mm
• Lenovo ThinkPad SL400 also M2 × 3 mm
• Dell Vostro 15 7590 also M2 × 3 mm
• Lenovo ThinkPad W500 also M2 × 3 mm
• HP Compaq 6515b also M2 × 3 mm
• HP EliteBook 6 G2ah 14 inch also M2 × 3 mm
• Lenovo ThinkPad X240 also M2 × 3 mm
• Lenovo ideapad 310 Touch-15ISK also M2 × 3 mm

Questions about Lenovo ThinkPad E550 screws

What size screw does Lenovo ThinkPad E550 use?

M2 × 2.4 mm for speaker (qty 4, wafer, black); M2 × 3 mm for display (qty 4, wafer, black); M2 × 3 mm for palm rest (qty 6, wafer, black); M2 × 3 mm for wireless card (qty 1, wafer, black); M2 × 4 mm for hard drive (qty 4, wafer, silver); M2 × 4 mm for optical drive (qty 1, wafer, silver); M2 × 5 mm for fan (qty 1, wafer, black); M2 × 5 mm for palm rest (qty 4, wafer, black); M2 × 5 mm for system board (qty 4, flat, black); M2 × 5 mm for unspecified (qty 1, wafer, black); M2 × 8 mm for keyboard (qty 3, flat, black); M2 × 8 mm for palm rest (qty 15, wafer, black); M2.5 × 4 mm for display (qty 6, wafer, silver); M2.5 × 5 mm for display (qty 4, wafer, black).

How long are the screws in Lenovo ThinkPad E550?

The records range from 2.4 to 8 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 E550?

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 E550?

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