2.5in SFF drive trays (Dell & HP server/SFF trays) screw size
M3 · 4 mm long
If you are replacing a screw on 2.5in SFF drive trays (Dell & HP server/SFF trays), the thread is M3, 4 mm long.
The record covers disctech product page sells 'Counter-Sunk Screws (M3 x 4mm) for SFF 2.5 Dell & HP trays', explicitly stating M3 thread for drive tray mounting.
This entry is marked confirmed and comes from disctech.com.
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.
2.5in SFF drive trays (Dell & HP server/SFF trays) 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 | 4 mm | 0.5 mm | not stated | not stated | disctech product page sells 'Counter-Sunk Screws (M3 x 4mm) for SFF 2.5 Dell & HP trays', explicitly stating M3 thread for drive tray mounting | Confirmed |
Fitment records and sources
disctech product page sells 'Counter-Sunk Screws (M3 x 4mm) for SFF 2.5 Dell & HP trays', explicitly stating M3 thread for drive tray mounting.
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
- 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 record states 4 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- 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
- Server drive caddy screws (Dell, HP) are usually M3 in very short lengths (3-4mm) because they bite into thin sheet metal — they are NOT the 6-32 UNC screws that go into the drive's own side holes.
- 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.
More in Electronics, Racks & Enclosures
The same screw also fits
Devices whose records share a thread with 2.5in SFF drive trays (Dell & HP server/SFF trays), closest length match first.
- PEM KFE-M3-4ET broaching standoff also M3 × 4 mm
- Mean Well NMP650 / NMP1K2 modular power supply also M3 × 4 mm
- Cognex In-Sight 8000/8200/8400 vision system also M3 × 4 mm
- Oracle MICROS Universal PED kiosk mount also M3 × 4 mm
- 2.5in SATA / SAS hard drives and SSDs (SFF-8201) also M3 × 4 mm
- cab Applicator A3200 print-and-apply labeling system (packaging line hardware) also M3 × 4 mm
- Dell/HP SFF 2.5-inch drive tray also M3 × 4 mm
- Network switch & patch panel internals also M3 × 4 mm
Questions about 2.5in SFF drive trays (Dell & HP server/SFF trays) screws
- What size screw does 2.5in SFF drive trays (Dell & HP server/SFF trays) use?
- M3 × 4 mm for disctech product page sells 'Counter-Sunk Screws (M3 x 4mm) for SFF 2.5 Dell & HP trays', explicitly stating M3 thread for drive tray mounting.
- How long are the screws in 2.5in SFF drive trays (Dell & HP server/SFF trays)?
- The record gives 4 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 2.5in SFF drive trays (Dell & HP server/SFF trays)?
- 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 2.5in SFF drive trays (Dell & HP server/SFF trays)?
- TechSpareWarehouse (our own store) lists M3 x 4mm, which matches the length in the records above.