M3 x 3mm screws — what they fit & where to buy
868 sourced applications in this database list a M3 screw at 3 mm (or a length range that includes it), most of them in laptops & pcs. A M3 x 3mm screw has a 0.5 mm coarse pitch, so a fully engaged 3 mm shank gives about 6 thread turns (1× the diameter).
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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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 -
25x M3 x 3mm Phillips Screws for Acer Nitro 5 HDD Caddy Bracket SSD
$5.99
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M3 x 3mm Screws for Dell Inspiron 15 3520 Hard Drive Bracket 10-Pack Black
$4.99
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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 -
M3 x 4mm Phillips Wafer Head Screws for 2.5 SATA SSD Mounting 10-Pack
$4.99 -
M3 x 4mm Phillips Wafer Head Screws for HDD Caddy Bracket 10-Pack
$4.99
M3 x 3mm specs
- Thread
- M3 × 0.5
- Length
- 3 mm
- Thread turns
- ≈ 6
- Length ÷ diameter
- 1×
- Tap drill
- 2.5 mm
- Clearance (close)
- 3.2 mm
- Phillips
- PH1
- Torx / hex
- T10 / 2.5 mm
Length is measured from under the head for pan, wafer and button heads, and overall for flat (countersunk) heads. Neighbouring sizes we track: M3 x 4 mm (345).Going 0.5 mm too long can bottom out in a blind boss or touch a board underneath.
Where M3 x 3mm screws are used
- Laptops & PCs806
- Cameras & Optics15
- Electronics, Racks & Enclosures12
- Industrial & Machinery7
- 3D Printing, CNC & Robotics7
- Displays, TVs & Mounts7
- Printers, POS & Office6
- Other Equipment3
More M3 x 3mm listings named for specific devices
- M3 x 3mm Phillips Flat Head Screw for Acer Nitro 5 Laptop Repair - Single Replacement Black
Devices that use M3 x 3mm screws (868)
the SFF-8201 standard: four M3 side holes, plus two optional bottom holes on 7mm drives
3-4mm side (short, so it can't touch the PCB) · confirmed · source
M3 for 2.5in SSD side mounting; 3.5in bays are tool-less or 6-32
3-4mm · confirmed · source
ATX boards thread into brass standoffs with M3 machine screws
3-5mm, thin flat/pan head · confirmed · source
bezel and mounting bracket screws, unlike desktop 5.25in bays
3-4mm · reported · source
extruder body, idler and Bondtech gear assembly are M3 throughout
10-40mm (idler M3x40, body M3x10-18) · confirmed · source
heater block clamp, fan shroud, and headless grub screws
3-4mm grub, 6-10mm shroud · confirmed · source
holds the handle nut retainer plate on baitcasters
3-10mm · confirmed · source
Caddy securing screw, genuine Dell part M3x3
3mm · reported · source
GoldStar Tool sells 'Needle Clamp Screw M3x3' for JUKI sewing machines, part SM-8030312-TP
3mm · confirmed · source
Four screws securing hard-drive bracket to hard drive
3mm · high · source
Product page explicitly names part 'Needle Clamp Screw M3x3 - JUKI #SM-8030312-TP'
3mm · high · source
M3 x 4 hex socket set screws clamping pulley to motor shaft
3-6mm · confirmed · source
Hot block to heat sink, M3 x 0.5 screws
M3 x 0.5 (2 pcs) · confirmed · source
Kit contains M3x3 and M3x10 socket dome screws
3mm and 10mm · likely · source
Manual lists M3 x 3mm black wafer head (5 pcs)
3mm · confirmed · source
Cover fixing screws, manual states M3 x 3
3mm · confirmed · source
The 2.5in drive form-factor standard tabulates M3 threads for the side and bottom mounting holes
max 2.0mm penetration on 7mm drives, 3.0mm on thicker · confirmed · source
M3 x 3mm and M3 x 10mm socket dome screws for heater block / nozzle assembly
3-10mm · confirmed · source
Installation guide explicitly specifies the mount locking screw on both sides as Hex M3
M3 · confirmed · source
Replacement M3-0.5mm thread pitch set/thumb screws explicitly sold for 1.25" diagonal eyepiece and SCT visual back thumbscrews, and some finder/guide scope shoes
M3 · confirmed · source
Anodized accessory thumb screws explicitly sold in M3 and M4, with M3 commonly used for smaller eyepiece/accessory threads
M3x12, M4x12 · confirmed · source
Screw-size database lists this Barlow's thumb/set screw explicitly as M3-0.5
M3 · confirmed · source
Included hardware kit lists M3 x 24mm screws for attaching the projector plate to smaller projectors
M3x24 · confirmed · source
Included fastener set explicitly lists M3 x 12mm screws for small-format projector adapter plates
M3x12 · confirmed · source
Universal projector plate hardware kit explicitly specifies M3 x 8mm screws
M3x8 · confirmed · source
Illustrated parts manual lists M3 x 0.5 pitch machine screws used on control/board mounting hardware
M3x0.5 pitch · confirmed · source
Maintenance manual specifies M3 x 6mm screws for internal sensor/board fixation during adjustment procedures
M3x6 · confirmed · source
Service manual specifies M3 fasteners in multiple lengths (M3x4, M3x5, M3x7.5, M3x10, M3x20, M3x25) for internal assembly, sensor brackets and covers
M3x4, M3x5, M3x7.5, M3x10, M3x20, M3x25 · confirmed · source
Service manual references M3 machine screws for internal PCB/terminal mounting within the indicator enclosure
M3 (length not fully specified in excerpt) · likely · source
Care and use guide for the PeriPod M3 multi-channel peristaltic doser used on aquarium/reservoir setups; wall-mount bracket is secured using M3 screws per the mounting instructions
M3 (bracket screws) · likely · source
Service manual for the Centrella Smart+ hospital bed documents M3 machine screws used to secure the control panel PCB and pendant housing covers during disassembly/service procedures
M3 (length per specific housing screw, not itemized in excerpt) · likely · source
COSEL's official terminal block torque FAQ explicitly lists M3 screw diameter with recommended torque 0.36-0.6 N·m for terminal block connections used across their industrial power supplies
M3x6-M3x8 · confirmed · source
Guide explicitly specifies 'M3 Screw — 0.5 Nm... IEC 60999-1 Standard' used in 5.0mm/5.08mm pitch terminal blocks common in control panels (bakery mixer, car wash, EV kiosk control boards)
M3x6 · confirmed · source
Samsung washer service manual explicitly lists M3 screws for control board and sensor bracket fasteners in its exploded parts diagram torque table
M3x8 · likely · source
Same service manual explicitly lists 'M3x12,8.8' and 'M3x6' and 'M3x12' fasteners in the balance's internal assembly diagrams
M3x6, M3x12 · confirmed · source
internal chassis frame machine screws (14)
3mm · confirmed · Source: HP E24d/E27d G4 Maintenance and Service Guide
SMT PCB standoff for mounting boards to housings or other boards
0.5-16mm standoff height · confirmed · Source: we-online.com WA-SMSI product page
front-face tapped mounting holes, 3.18mm deep
tapped 3.18mm deep · confirmed · source
Distance bolts for plastic enclosure bosses have M3 internal threads.
M3 internal thread · confirmed · source
Safety stop screws: "M3 x 3mm Socket Head Cap Screw (Qty 2)"
3 mm · confirmed · source
Celestron's official knowledge base lists collimation screw thread as M3 x 0.5, 10mm, for the C5 optical tube.
M3x10 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 10mm collimation screws for the C6 tube.
M3x10 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 8mm collimation screws for the C8 tube.
M3x8 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 10mm collimation screws for the C9.25 tube.
M3x10 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 12mm collimation screws for the C11 tube.
M3x12 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 18mm collimation screws for the C14 tube.
M3x18 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 12mm collimation screws for the 8" EdgeHD tube.
M3x12 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 10mm collimation screws for the 9.25" EdgeHD tube.
M3x10 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 12mm collimation screws for the 11" EdgeHD tube.
M3x12 mm · confirmed — Celestron Knowledge Base · source
Official Celestron reference lists M3 x 0.5, 18mm collimation screws for the 14" EdgeHD tube.
M3x18 mm · confirmed — Celestron Knowledge Base · source
NCR service help states: 'Remove two (2) M3 screws to detach the Verifone P400 PIN Pad from the PIN Pad Adapter'
M3 (length not specified) · confirmed — NCR Online Help (onlinehelp.ncr.com) · source
Same Elo assembly manual lists 'P400 Screws Qty.2 Screw, M3x6, Pan Head, Cross Recess, Black'
M3x6 mm · confirmed — Elo Touch Solutions UM600683 · source
Parts listing: 'Diebold Nixdorf ESC Cross Screw M3*4*6 ATM Parts 49221808000F' — screw described explicitly as M3
M3x4x6 mm (head dia x length variant) · confirmed — Diebold Nixdorf OEM parts listing · source
Same manual, Bag C: 'SCREW, M3X8, PAN-HEAD, CROSS-RECESS' Qty.3
M3x8 mm · confirmed — Elo Touch Solutions QIG600074 · source
Assembly instructions Bag C: 'SCREW, M3X8, PAN-HEAD' Qty.2
M3x8 mm · confirmed — Elo Touch Solutions QIG600186 · source
OEM engineering drawing callout: 'M3 X 8MM BUTTON HEAD SCREW SECURES ACCESS COVER TO VERIFONE M400 REAR LOCKING BRACKET'
M3x8 mm · confirmed — Verifone-compatible mounting bracket engineering drawing (Collage/CDN hosted OEM spec) · source
PEM PF11-M3 series 'Self Clinching Panel Fastener' explicitly specified as M3 thread, marketed for cabinet/access-panel fastening including ATM manufacturing contexts
M3 (knurled head captive screw) · confirmed — PEM/Zygology official product spec (PF11-M3-1) · source
PEM FH-M3-6ZI datasheet: 'Thread Code: M3, Thread Size: M3 x 0.5, Thread Specification: 6g, ASME B1.13M'
M3 x 0.5, 6 mm stud · confirmed — PEM official product finder spec sheet · source
PEM CLS-M3-1 datasheet: 'Thread Code: M3, Thread Size: M3 x 0.5, Thread Specification: 6H, ASME B1.13M'
M3 x 0.5 (nut) · confirmed — PEM official product finder spec sheet · source
Display (qty 4, silver, Phillips)
3 mm · confirmed · source
Hard drive (qty 4, flat, silver)
3 mm · confirmed · source
Hard drive (qty 4, silver, Phillips)
3 mm · confirmed · source