M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack
Bulk Discounts
| Quantity | Price per unit |
|---|---|
| Buy 1 – 49 pcs | $4.99 /each |
| Buy 50 – 499 pcs | $4.49 /each |
| Buy 500 – 999 pcs | $3.99 /each |
| Buy 1000 – 2499 pcs | $3.49 /each |
| Buy 2500 – 4999 pcs | $2.99 /each |
| Buy 5000 + pcs | $2.50 /each |
M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack is backordered and will ship as soon as it is back in stock.
- Free US shipping $25+
- Ships within 24h (Mon–Sat) from South Carolina, tracked; US delivery 1–5 business days after dispatch
- 30-day returns
How many packs?
Free US shipping on orders of $25+. Under $25, shipping is calculated at checkout.
Fits
- Synology DiskStation 2.5-inch SSD bay installation
- Synology DS220 DS720 DS920 and similar models
- QNAP NAS 2.5-inch SSD drive mounting
+ 1 more in the compatibility list below
Size M3 · 4mm · Phillips Flat Head Low Profile · 10 Screws
Not sure? Compare with the screw size chart or ask us before you order.
Fit check before you order (30 seconds)
- Thread M3 = the threaded shank is 3 mm across. Hold the old screw against a ruler or use calipers; M2, M2.5 and M3 look alike but do not swap.
- Length 4 mm is measured from under the head to the tip. Too long can hit parts behind the hole.
- Same device? Check the model in the title and the Fits list above against the label on your device.
Still unsure? Send us a photo of the screw next to a ruler and the device model.
Often needed together
- $4.99
- $4.99
Each line is added at $4.99 or more, the cart’s minimum per line. The total is at list price; bulk discounts by quantity come off in the cart.
M3 x 4mm Screws for Installing SSD into Synology NAS | Phillips Flat Head | 10-Pack
Confirmed M3 x 4mm mounting screws for installing 2.5-inch SSDs into Synology NAS drive bays.
Why the Right Screw Matters
Synology NAS drive bays use M3 x 4mm screws to secure 2.5-inch SSDs. Using a longer screw risks puncturing the drive PCB while a shorter one leaves the drive rattling loose.
- Stripped threads and damaged housings
- Loose components causing poor performance or failure
- Permanent damage to delicate parts
Compatibility
- Synology DiskStation 2.5-inch SSD bay installation
- Synology DS220 DS720 DS920 and similar models
- QNAP NAS 2.5-inch SSD drive mounting
- Universal NAS enclosure 2.5-inch drive canister screws
Specifications
- Screw Type: Machine Screw
- Thread Size: M3
- Length: 4mm
- Head Style: Phillips Flat Head Low Profile
- Drive Style: Phillips
- Material: Carbon Steel
- Finish: Black Oxide
- Thread Standard: Metric
- Pack Quantity: 10 Screws
Important: M3 screws are not compatible with M2 or M2.5 threaded holes. Please verify your thread size before ordering.
Fits these models
Devices whose service manuals, parts lists or manufacturer specifications call for an M3 x 4mm metric screw at the position shown. The thread and length match; check that the screw you are replacing also has a flat (countersunk) head.
| Device / model | Where the screw goes | Source |
|---|---|---|
| NAS drive trays (Synology / QNAP) | M3 for 2.5in SSD side mounting; 3.5in bays are tool-less or 6-32 | members.snia.org |
| 2.5in SATA SSD / HDD | the SFF-8201 standard: four M3 side holes, plus two optional bottom holes on 7mm drives | members.snia.org |
| Oracle MICROS Universal PED kiosk mount | Zebra scanner attaches to the mounting bracket with 2x M3 x 4mm Phillips flat-head screws | docs.oracle.com |
| Prusa i3 MK3S/MK4 printed parts and extruder | M3 machine screws from M3x4 to M3x40 listed by part code in the official Prusa cheatsheet | prusa3d.com |
| 2.5in SFF drive trays (Dell & HP server/SFF trays) | disctech product page sells 'Counter-Sunk Screws (M3 x 4mm) for SFF 2.5 Dell & HP trays', explicitly stating M3 thread for drive tray… | disctech.com |
| Giada JC530 signage player Theft-proof lock mounting screws (2 pcs) | M3*L4mm mechanical screws for the anti-theft lock | manualspro.net |
| Bixolon SRP-B300II POS receipt printer | Cover, frame and mechanism screws listed as M3x4, M3x6, M3x8 | bixolon.com |
| Aimpoint Micro T-1/T-2/H-1/H-2 standard mount screw | Official Aimpoint spare part 11866, M3x4 screws | aimpoint.us |
| Takachi RPI aluminium Raspberry Pi case | Four flat head case-to-cover screws | takachi-enclosure.com |
| HP LaserJet family common hardware | Trus-head Phillips M3 x 4, 8, 10 and 25mm screws, some with star washer | tryus.org |
| cab Applicator A3200 print-and-apply labeling system (packaging line hardware) | Service manual specifies M3 fasteners in multiple lengths (M3x4, M3x5, M3x7.5, M3x10, M3x20, M3x25) for internal assembly, sensor brackets… | cab.de |
| Dell P2425D monitor | metal frame to panel screws (2x) | objects.icecat.biz |
Full list: M3 x 4mm on Screw Fitment Database
What does an M3 x 4mm screw fit?
Service manuals and manufacturer specs list an M3 x 4mm screw in: NAS drive trays (Synology / QNAP); 2.5in SATA SSD / HDD; Oracle MICROS Universal PED kiosk mount; Prusa i3 MK3S/MK4 printed parts and extruder; 2.5in SFF drive trays (Dell & HP server/SFF trays). Match the head style of the screw you removed (this is a flat countersunk Phillips head).
Common Applications & Use Cases for Metric Screws
Common Applications & Use Cases for Metric Screws
Computers, Laptops & Electronics
- Laptop bottom covers and chassis fastening
- Laptop hinge mounting and reinforcement
- Keyboard plate and PCB mounting
- SSD and M.2 drive installation
- Motherboard standoff and component mounting
- Cooling fan and heatsink attachment
- Graphics card shroud and bracket screws
- Power supply housing fasteners
- Monitor stand and VESA mounting hardware
Keyboards, Gaming & Accessories
- Mechanical keyboard case assembly
- Keyboard PCB and plate mounting
- Switch plate reinforcement
- Custom keyboard builds and repairs
- Gaming controller housing screws
- Mouse shell and internal component fastening
Audio, Video & Camera Equipment
- Audio amplifier enclosure screws
- Speaker cabinet mounting hardware
- Microphone housing and clip fastening
- Camera body and accessory mounting
- Tripod plate and quick-release adapters
- AV rack and equipment chassis screws
Home Appliances & Small Devices
- Coffee machine internal fasteners
- Vacuum cleaner housing screws
- Small kitchen appliance assembly
- Smart home device mounting
- Router and modem casing screws
- Printer and scanner component fastening
Furniture, Fixtures & Home Hardware
- Cabinet hinges and drawer hardware
- Furniture frame assembly
- Bed frame brackets and supports
- Door handles and locksets
- Light fixture mounting screws
- Wall-mounted accessories and brackets
Automotive, Powersports & Mobility
- Interior trim and dashboard components
- License plate brackets
- Motorcycle fairings and panels
- Bicycle accessories and components
- Car audio and dash installations
- Electric scooter and e-bike assemblies
Industrial, Commercial & Workshop Use
- Control panel enclosures
- Electrical junction boxes
- Equipment housings and covers
- Small machinery guards
- Industrial electronics mounting
- Maintenance and repair hardware
DIY, Repair & General Hardware
- Electronics repair projects
- Prototyping and hobby builds
- Replacement for lost or stripped screws
- Custom fabrication projects
- 3D-printed part assembly
- General fastening where precision is required
Miscellaneous & Specialty Uses
- Robotics and automation projects
- RC cars, drones, and hobby equipment
- Educational STEM kits
- Test fixtures and lab equipment
- Custom enclosures and cases
How to Choose the Correct Screw
How to Choose the Correct Screw
Selecting the correct screw is important for proper fit, strength, and long-term reliability. Before ordering, confirm the following:
Screw Size (Diameter)
Measure the outer thread diameter of the screw. Metric screws are labeled in millimeters, such as M2, M2.5, or M3.
Length
Measure from under the head to the tip of the screw unless otherwise specified by the head style.
Thread Type
Ensure the thread matches the receiving material. Most electronics and hardware applications require metric machine threads rather than self-tapping threads.
Head Type
Confirm the head style needed for proper seating, such as flat head, pan head, or button head.
Drive Type
Match the drive type (Phillips, Torx, Hex, etc.) to the tools you plan to use and the torque requirements of the application.
Material & Finish
Choose the appropriate material and finish based on strength, corrosion resistance, and environmental conditions.
If you are replacing an existing screw, we recommend removing one and comparing the diameter, length, and head type directly before ordering to ensure a proper fit.
Frequently Asked Questions
Frequently Asked Questions
Are these screws metric or imperial?
These are metric screws. Metric screws are measured in millimeters and are commonly used in electronics, laptops, keyboards, and precision hardware.
How is screw length measured?
Screw length is measured from under the head to the tip of the screw, unless otherwise specified by the head style.
Will these screws fit laptops, keyboards, or electronics?
Yes. These screws are commonly used in laptops, mechanical keyboards, SSD mounting, cameras, and other electronic devices. Always verify size and thread type before ordering.
Can these screws be used as replacements?
Yes. These screws are ideal replacements for lost or stripped screws in compatible devices. We recommend comparing one existing screw for best fit.
What tools are required to install these screws?
Installation typically requires a matching screwdriver based on the drive type, such as Phillips, Torx, or Hex. No special tools are required.
Delivery and Shipping
Delivery and Shipping
Usually Ships Within 24 Hours. All Orders Are Shipped With Tracking Numbers.
M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack
M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack is backordered and will ship as soon as it is back in stock.
We Accept
Frequently Asked Questions
What size is this screw?
Will this fit my device?
What material and finish is this?
How fast do you ship?
- Free US shipping on orders $25+
- Usually ships within 24 hours (Mon–Sat) from Elgin, SC, with tracking
- 30-day returns
- Questions? We reply within 24 hours
