Lenovo ThinkPad Iseries 1400 screw size
M2 / M3 · 4 to 5 mm long
Our records put Lenovo ThinkPad Iseries 1400 on M2 and M3 screws in lengths from 4 to 5 mm.
There are 6 separate fitment records for it, including optical drive (qty 3, pan) (M2), speaker (qty 2, pan) (M2) and base cover (qty 2, binding) (M2), plus 3 more in the table below.
Head and drive, as the sources state them: pan and binding heads.
6 of the 6 records are marked confirmed, drawn from 1 source (tim.id.au).
An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Lenovo ThinkPad Iseries 1400 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 | 4 mm | 0.4 mm | Pan head | not stated | Optical drive (qty 3, pan) | Confirmed |
| M2 | 4 mm | 0.4 mm | Pan head | not stated | Speaker (qty 2, pan) | Confirmed |
| M2 | 5 mm | 0.4 mm | Binding head | not stated | Base cover (qty 2, binding) | Confirmed |
| M2 | 5 mm | 0.4 mm | Binding head | not stated | Battery (qty 2, binding) | Confirmed |
| M3 | 4 mm | 0.5 mm | not stated | not stated | Hard drive (qty 2, silver) | Confirmed |
| M3 | 5 mm | 0.5 mm | Binding head | not stated | Hinge (qty 4, binding) | Confirmed |
Fitment records and sources
Optical drive (qty 3, pan)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker (qty 2, pan)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 2, binding)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery (qty 2, binding)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hard drive (qty 2, silver)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Hinge (qty 4, binding)
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 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 pan head / binding head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 4–5 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 / M3
- 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.
- 3.5in desktop and enterprise hard drives are 6-32 UNC imperial, not M3 - only the 2.5in form factor is metric.
- Suunto dive computer service manuals reference strap pins and battery compartment springs but do not explicitly cite a metric screw thread size in the sections reviewed; do not infer M2/M2.5 fitment for Suunto dive computer straps without direct confirmation.
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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M2 x 5mm Phillips Wafer Head Screw for Dell G16 7630 Gaming Laptop Repair - Pack of 100 Black
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M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack
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ASUS ROG Strix G15 G513R Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
$0.10Choose size -
ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Lenovo ThinkPad Iseries 1400, closest length match first.
- Toshiba Satellite P30 also M2 × 5 mm
- Dell Latitude 5310 also M2 × 4 mm
- HP ProBook 450 15.6 inch G9 also M2 × 4 mm
- Dell Inspiron 15 5515 also M2 × 4 mm
- HP EliteBook 865 16 inch G11 also M2 × 4 mm
- Dell Inspiron 15 3520 also M2 × 5 mm
- Lenovo ThinkPad P14s Gen 6 also M2 × 4 mm
- Lenovo Legion Y7000P also M2 × 4 mm
Questions about Lenovo ThinkPad Iseries 1400 screws
- What size screw does Lenovo ThinkPad Iseries 1400 use?
- M2 × 4 mm for optical drive (qty 3, pan); M2 × 4 mm for speaker (qty 2, pan); M2 × 5 mm for base cover (qty 2, binding); M2 × 5 mm for battery (qty 2, binding); M3 × 4 mm for hard drive (qty 2, silver); M3 × 5 mm for hinge (qty 4, binding).
- How long are the screws in Lenovo ThinkPad Iseries 1400?
- The records range from 4 to 5 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 Iseries 1400?
- 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 Iseries 1400?
- TechSpareWarehouse (our own store) lists M2 x 4mm, M2 x 5mm and M3 x 4mm, which match lengths in the records above.