NAS drive trays (Synology / QNAP) screw size
M3 · 3 to 4 mm long
If you are replacing a screw on NAS drive trays (Synology / QNAP), the thread is M3 in lengths from 3 to 4 mm.
Where it is used: M3 for 2.5in SSD side mounting; 3.5in bays are tool-less or 6-32.
This entry is marked confirmed and comes from members.snia.org.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
NAS drive trays (Synology / QNAP) 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 |
|---|---|---|---|---|---|---|
| M3 | 3–4 mm | 0.5 mm | not stated | not stated | M3 for 2.5in SSD side mounting; 3.5in bays are tool-less or 6-32 | Confirmed |
Fitment records and sources
M3 for 2.5in SSD side mounting; 3.5in bays are tool-less or 6-32
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Industrial parts lists usually give the full callout (thread, length, head, grade); match all four, not just the thread.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 3–4 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- 3.5in drives and 5.25in bays are 6-32; 2.5in drives and motherboard standoffs are M3. Keep the two bins apart.
- 3.5in desktop and enterprise hard drives are 6-32 UNC imperial, not M3 - only the 2.5in form factor is metric.
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.
-
M3 x 3mm Wafer Head Screws for Synology NAS Drive Canister 2.5 SSD Bay 10-Pack
$4.99 -
M3 x 3mm SSD Mounting Screws for HP Desktop 2.5 SATA Drive Replacement 10-Pack
$4.99 -
M3 x 4mm Phillips Wafer Head Screws for 2.5 SATA SSD Mounting 10-Pack
$4.99 -
M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack
$4.99 -
M3 x 4mm Phillips Wafer Head Screws for HDD Caddy Bracket 10-Pack
$4.99 -
M3 x 4mm Phillips Wafer Head Screws for SSD Hard Drive 10-Pack Black
$4.99 -
Dell Inspiron 15 3520 Replacement Screws Sold Individually – M2 x 3mm, M2 x 5mm, M2.5 x 5mm, M3 x 3mm Phillips Wafer Head, Black
$0.10Choose size -
M3 x 3mm Laptop HDD SSD Caddy Screws 2.5" SATA Hard Drive Mount Phillips
From $11.50Choose size
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Browse all 113 in Industrial & Machinery →The same screw also fits
Devices whose records share a thread with NAS drive trays (Synology / QNAP), closest length match first.
- NovAtel OEM7600 GNSS module also M3 × 4 mm
- JUKI industrial sewing machine needle clamp screw (SM-8030312-TP) also M3 × 3 mm
- JUKI sewing machine needle clamp screw also M3 × 3 mm
- Motherboard to case standoffs also M3 × 3–4 mm
- Acer Aspire 2920 also M3 × 4 mm
- Dell Precision 3571 also M3 × 3 mm
- Network switch & patch panel internals also M3 × 4 mm
- Dell Latitude D400 also M3 × 3 mm
Questions about NAS drive trays (Synology / QNAP) screws
- What size screw does NAS drive trays (Synology / QNAP) use?
- M3 × 3–4 mm for M3 for 2.5in SSD side mounting; 3.5in bays are tool-less or 6-32.
- How long are the screws in NAS drive trays (Synology / QNAP)?
- The records range from 3 to 4 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for NAS drive trays (Synology / QNAP)?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for NAS drive trays (Synology / QNAP)?
- TechSpareWarehouse (our own store) lists M3 x 3mm and M3 x 4mm, which match lengths in the records above.