ISO 14581 hexalobular (Torx) countersunk screw screw size
M3 · 4 to 20 mm long
ISO 14581 hexalobular (Torx) countersunk screw takes M3 metric screws in lengths from 4 to 20 mm.
The record covers ISO 14581 covers M1.6-M10 Torx countersunk screws — the profile behind many laptop and device screws.
Head and drive, as the source states them: flat / countersunk head and Torx drive.
This entry is marked reported and comes from fasteners.eu.
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
ISO 14581 hexalobular (Torx) countersunk screw 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 | 4–20 mm | 0.5 mm | Flat / countersunk | Torx | ISO 14581 covers M1.6-M10 Torx countersunk screws — the profile behind many laptop and device screws | Reported |
Fitment records and sources
ISO 14581 covers M1.6-M10 Torx countersunk screws — the profile behind many laptop and device screws
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 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: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The records span 4–20 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Torx drive. For comparison, standard M3 heads take PH1 (Phillips) or T10 (Torx), or a 2.5 mm hex key.
- 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
- ISO 14581 Torx countersunk screws look like plain countersunk screws but need the right lobe driver; a Phillips bit will chew the head.
- Telescope thumbscrews are sold in a wide non-metric legacy range too (1/4-20, 8-32, 10-32 on many Meade/Celestron mounts), so metric M3/M4 fitment applies mainly to newer/international accessory ecosystems (SkyWatcher, generic 1.25" accessories) and should not be assumed universal.
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 5mm Phillips Wafer Head Screw for Electronics & Project Box Repair - Pack of 50 Black
$4.79 each · min. 2
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M3 x 6mm Replacement Screws for XLR Audio Connectors Phillips Wafer Head 50-Pack
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M3 x 6mm Phillips Wafer Head Carbon Steel Machine Screws for XLR Audio Connectors | 50-Pack (Black)
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M3 x 4mm Phillips Wafer Head Screws for HDD Caddy Bracket 10-Pack
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M3 x 4mm Phillips Wafer Head Screws for SSD Hard Drive 10-Pack Black
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M3 x 6mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
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Devices whose records share a thread with ISO 14581 hexalobular (Torx) countersunk screw, closest length match first.
- HP EliteBook 8460p also M3 × 5 mm
- Lenovo M5400 also M3 × 4 mm
- Mechanical keyboard PCB standoffs also M3 × 6–10 mm
- HP EliteBook 9470m also M3 × 4 mm
- HP nc8230 also M3 × 4 mm
- Lenovo YOGA 500-14ISK also M3 × 4 mm
- Lenovo B590 also M3 × 4 mm
- 2.5in drive trays & caddies also M3 × 4–5 mm
Questions about ISO 14581 hexalobular (Torx) countersunk screw screws
- What size screw does ISO 14581 hexalobular (Torx) countersunk screw use?
- M3 × 4–20 mm for ISO 14581 covers M1.6-M10 Torx countersunk screws — the profile behind many laptop and device screws.
- How long are the screws in ISO 14581 hexalobular (Torx) countersunk screw?
- The records range from 4 to 20 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 ISO 14581 hexalobular (Torx) countersunk screw?
- The source lists a Torx drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or 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 ISO 14581 hexalobular (Torx) countersunk screw?
- TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.