Dell Inspiron 1721 screw size
M2 / M2.5 · 3 to 8 mm long
Our records put Dell Inspiron 1721 on M2 and M2.5 screws in lengths from 3 to 8 mm.
There are 17 separate fitment records for it, including camera (qty 2) (M2), display (qty 8) (M2) and keyboard (qty 4) (M2), plus 14 more in the table below.
Head and drive, as the sources state them: shoulder screw head.
17 of the 17 records are marked confirmed, drawn from 1 source (dl.dell.com).
M2 means a 2 mm nominal diameter with a 0.4 mm thread pitch. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Dell Inspiron 1721 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 | 3 mm | 0.4 mm | not stated | not stated | Camera (qty 2) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Display (qty 8) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Keyboard (qty 4) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Palm rest (qty 6) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Unspecified (qty 2) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Wireless card (qty 2) | Confirmed |
| M2.5 | 4.2 mm | 0.45 mm | Shoulder screw | not stated | Display bezel (qty 6, shoulder) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Card reader (qty 4) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Display (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Fan (qty 4) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Hard drive (qty 3) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Speaker (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | System board (qty 12) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Unspecified (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Wireless card (qty 1) | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Display (qty 2) | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Palm rest (qty 16) | Confirmed |
Fitment records and sources
Camera (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Keyboard (qty 4)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 6)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display bezel (qty 6, shoulder)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Card reader (qty 4)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Fan (qty 4)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 3)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Speaker (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
System board (qty 12)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Unspecified (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Wireless card (qty 1)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 16)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
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, 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 shoulder screw screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 3–8 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
- M.2 SSD mounting screws (M2 x 3mm) are frequently mislabeled generically as 'M.2 screws' which can be confused with the M2 metric thread designation — they do coincide numerically here but are conceptually distinct (M.2 = card format, M2 = thread size).
- 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.
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
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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M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 Display Hinge 10-Pack Black
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M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 System Board Hinge 10-Pack Black
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M2.5 x 5mm Screws Compatible with Dell XPS 14 9440 Display Assembly 10-Pack
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M2.5 x 5mm Phillips Wafer Head Screw for Action Camera Protective Housing - Pack of 50 Black
$4.79 each · min. 2
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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
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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 Dell Inspiron 1721, closest length match first.
- HP 17-ck2000 (ids 2100371661 also M2 × 3 mm
- Dell Vostro 13 5301 also M2 × 3 mm
- Lenovo ideapad 305-14IBD also M2 × 3 mm
- Lenovo ideapad 310-15ABR also M2 × 3 mm
- Lenovo ThinkPad X230i Tablet also M2 × 3 mm
- Dell Inspiron 17 3782 also M2 × 3 mm
- Lenovo N23 Chromebook also M2 × 3 mm
- HP EliteBook 848 G4 also M2 × 3 mm
Questions about Dell Inspiron 1721 screws
- What size screw does Dell Inspiron 1721 use?
- M2 × 3 mm for camera (qty 2); M2 × 3 mm for display (qty 8); M2 × 3 mm for keyboard (qty 4); M2 × 3 mm for palm rest (qty 6); M2 × 3 mm for unspecified (qty 2); M2 × 3 mm for wireless card (qty 2); M2.5 × 4.2 mm for display bezel (qty 6, shoulder); M2.5 × 5 mm for card reader (qty 4); M2.5 × 5 mm for display (qty 2); M2.5 × 5 mm for fan (qty 4); M2.5 × 5 mm for hard drive (qty 3); M2.5 × 5 mm for speaker (qty 2); M2.5 × 5 mm for system board (qty 12); M2.5 × 5 mm for unspecified (qty 2); M2.5 × 5 mm for wireless card (qty 1); M2.5 × 8 mm for display (qty 2); M2.5 × 8 mm for palm rest (qty 16).
- How long are the screws in Dell Inspiron 1721?
- The records range from 3 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 Dell Inspiron 1721?
- 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 Dell Inspiron 1721?
- TechSpareWarehouse (our own store) lists M2 x 3mm, M2.5 x 4mm and M2.5 x 5mm, which match lengths in the records above.