Lenovo ThinkPad R400 screw size
M2 / M2.5 / M3 · 2 to 17 mm long
Lenovo ThinkPad R400 takes M2, M2.5 and M3 metric screws in lengths from 2 to 17 mm.
There are 41 separate fitment records for it, including base cover (qty 2, flat, black) (M2), card reader (qty 2, flat, black) (M2) and keyboard (qty 1, flat, black) (M2), plus 38 more in the table below.
Head and drive, as the sources state them: binding head.
41 of the 41 records are marked confirmed, drawn from 2 sources (download.lenovo.com and tim.id.au).
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 R400 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.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M2 | 14 mm | 0.4 mm | not stated | not stated | Base cover (qty 2, flat, black)black finish | Confirmed |
| M2 | 14 mm | 0.4 mm | not stated | not stated | Card reader (qty 2, flat, black)black finish | Confirmed |
| M2 | 14 mm | 0.4 mm | not stated | not stated | Keyboard (qty 1, flat, black)black finish | Confirmed |
| M2 | 14 mm | 0.4 mm | not stated | not stated | Palm rest (qty 4, flat, black)black finish | Confirmed |
| M2 | 17 mm | 0.4 mm | not stated | not stated | Base cover (qty 2, flat, black)black finish | Confirmed |
| M2 | 17 mm | 0.4 mm | not stated | not stated | Card reader (qty 2, flat, black)black finish | Confirmed |
| M2 | 17 mm | 0.4 mm | not stated | not stated | Keyboard (qty 1, flat, black)black finish | Confirmed |
| M2 | 17 mm | 0.4 mm | not stated | not stated | Palm rest (qty 4, flat, black)black finish | Confirmed |
| M2 | 2 mm | 0.4 mm | Binding head | not stated | Display (qty 1, binding, black)black finish | Confirmed |
| M2 | 2.7 mm | 0.4 mm | not stated | not stated | System board (qty 2, flat, black)black finish | Confirmed |
| M2 | 2.8 mm | 0.4 mm | not stated | not stated | Display (qty 4, flat, silver) | Confirmed |
| M2 | 2.8 mm | 0.4 mm | not stated | not stated | Wireless card (qty 1, flat, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Base cover (qty 1, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Card reader (qty 1, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Chassis/frame (qty 1, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Fan (qty 3, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Memory (qty 1, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Palm rest (qty 4, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Speaker (qty 4, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Unspecified (qty 2, small-head, silver) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Wireless card (qty 2, small-head, silver) | Confirmed |
| M2 | 3.5 mm | 0.4 mm | not stated | not stated | I/O board (qty 3, flat, black)black finish | Confirmed |
| M2 | 3.5 mm | 0.4 mm | not stated | not stated | Base cover (qty 3, flat, black)black finish | Confirmed |
| M2 | 3.5 mm | 0.4 mm | not stated | not stated | Battery (qty 1, flat, black)black finish | Confirmed |
| M2 | 3.5 mm | 0.4 mm | not stated | not stated | Chassis/frame (qty 1, flat, black)black finish | Confirmed |
| M2 | 3.5 mm | 0.4 mm | not stated | not stated | Display (qty 1, flat, black)black finish | Confirmed |
| M2 | 3.5 mm | 0.4 mm | not stated | not stated | Unspecified (qty 1, flat, black)black finish | Confirmed |
| M2 | 3.5 mm | 0.4 mm | Binding head | not stated | Wireless card (qty 6, binding, black)black finish | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Base cover (qty 7, flat, black)black finish | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Card reader (qty 7, flat, black)black finish | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Chassis/frame (qty 1, flat, black)black finish | Confirmed |
| M2 | 9.5 mm | 0.4 mm | Binding head | not stated | Base cover (qty 1, binding, black)black finish | Confirmed |
| M2 | 9.5 mm | 0.4 mm | Binding head | not stated | Card reader (qty 1, binding, black)black finish | Confirmed |
| M2 | 9.5 mm | 0.4 mm | Binding head | not stated | Chassis/frame (qty 2, binding, black)black finish | Confirmed |
| M2 | 9.5 mm | 0.4 mm | Binding head | not stated | Fan (qty 4, binding, black)black finish | Confirmed |
| M2 | 9.5 mm | 0.4 mm | Binding head | not stated | Palm rest (qty 1, binding, black)black finish | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | not stated | Base cover (qty 2, flat, black)black finish | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | not stated | Card reader (qty 2, flat, black)black finish | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | not stated | Display (qty 4, flat, black)black finish | Confirmed |
| M2.5 | 6.5 mm | 0.45 mm | Binding head | not stated | Display (qty 4, flat,binding, black)black finish | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | not stated | Hard drive (qty 1, black)black finish | Confirmed |
Fitment records and sources
Base cover (qty 2, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 2, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Keyboard (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 4, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 2, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 2, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Keyboard (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 4, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 1, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
System board (qty 2, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 4, flat, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (qty 1, flat, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 1, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 1, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Chassis/frame (qty 1, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Fan (qty 3, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Memory (qty 1, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 4, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker (qty 4, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 2, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (qty 2, small-head, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
I/O board (qty 3, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 3, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Chassis/frame (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (qty 6, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 7, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 7, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Chassis/frame (qty 1, flat, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 1, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 1, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Chassis/frame (qty 2, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Fan (qty 4, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 1, binding, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 2, flat, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Card reader (qty 2, flat, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 4, flat, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 4, flat,binding, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 1, black)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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). This device also uses M2.5 / M3, so measure each screw rather than assuming they match.
- 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: for binding head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 2–17 mm, which means different positions take different lengths — match each hole to its own screw.
- 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.
- 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.
Common mix-ups with M2 / M2.5 / M3
- The standard M.2 SSD screw is M2 x 3mm, but some laptops and handhelds use non-standard lengths or head shapes.
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
- The bioprinter M3 reference is a tube-connector thread spec, not a structural chassis screw; verify before assuming interchangeability with fastener screws.
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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The same screw also fits
Devices whose records share a thread with Lenovo ThinkPad R400, closest length match first.
- Lenovo ideapad 330S-15IKB GTX1050 also M2 × 3 mm
- Lenovo ThinkPad E450 also M2 × 3 mm
- Acer TravelMate 7220 also M2 × 3 mm
- HP ProBook 450 G7 also M2 × 2 mm
- Lenovo ThinkPad L440 also M2 × 3 mm
- Acer Aspire 4930 also M2 × 3 mm
- Lenovo ThinkPad T430s also M2 × 3 mm
- Lenovo ThinkPad T431s also M2 × 2 mm
Questions about Lenovo ThinkPad R400 screws
- What size screw does Lenovo ThinkPad R400 use?
- M2 × 14 mm for base cover (qty 2, flat, black); M2 × 14 mm for card reader (qty 2, flat, black); M2 × 14 mm for keyboard (qty 1, flat, black); M2 × 14 mm for palm rest (qty 4, flat, black); M2 × 17 mm for base cover (qty 2, flat, black); M2 × 17 mm for card reader (qty 2, flat, black); M2 × 17 mm for keyboard (qty 1, flat, black); M2 × 17 mm for palm rest (qty 4, flat, black); M2 × 2 mm for display (qty 1, binding, black); M2 × 2.7 mm for system board (qty 2, flat, black); M2 × 2.8 mm for display (qty 4, flat, silver); M2 × 2.8 mm for wireless card (qty 1, flat, silver); M2 × 3 mm for base cover (qty 1, small-head, silver); M2 × 3 mm for card reader (qty 1, small-head, silver); M2 × 3 mm for.
- How long are the screws in Lenovo ThinkPad R400?
- The records range from 2 to 17 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 R400?
- 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 R400?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 2.5mm and M2 x 3mm, which match lengths in the records above.