Generic hex socket button head screw (ISO 7380-1) screw size
M3 · length not stated in the sources
The screws used on Generic hex socket button head screw (ISO 7380-1) are M3. None of the sources we found gives an exact length, so measure the original before you order.
The record covers ISO 7380-1:2011/2022 specifies hex socket button head screws for thread sizes from M3 up to and including M16, with thread tolerance 5g6g (property class 12.9) or 6g (other classes).
Head and drive, as the source states them: button head and Hex socket (Allen) drive.
This entry is marked confirmed and comes from amesweb.info.
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.
Generic hex socket button head screw (ISO 7380-1) 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 | not stated | 0.5 mm | Button head | Hex socket (Allen) | ISO 7380-1:2011/2022 specifies hex socket button head screws for thread sizes from M3 up to and including M16, with thread tolerance 5g6g (property class 12.9) or 6g (other classes) | Confirmed |
Fitment records and sources
ISO 7380-1:2011/2022 specifies hex socket button head screws for thread sizes from M3 up to and including M16, with thread tolerance 5g6g (property class 12.9) or 6g (other classes)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- 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: for button head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- Driver: the source names a Hex socket (Allen) 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
- Model rocketry altimeter manuals (Apogee AIM USB, Rocketronics AltiMAX G4, RockeTiltometer) contain no explicit metric screw thread callouts in their documentation; mounting is typically via hook-and-loop or generic standoffs, so no metric fitment can be confirmed for this category.
- Printer manuals often mix screw callouts like 'M3*8L' (length in mm after the L) with driver-bit-only references elsewhere in the same manual — only the explicit M-prefixed entries were captured here.
More in Standards & References
The same screw also fits
Devices whose records share a thread with Generic hex socket button head screw (ISO 7380-1), closest length match first.
- TO-220 / TO-247 power semiconductor heatsink mounting also M3
- Airsoft AEG Version 2 / EHPA gearbox shell also M3
- NBK cleanroom/semiconductor vented socket head cap screw (SVSHT-M3-SD) also M3
- ARRI rosette accessory adapter also M3
- 2.5in SATA SSD / HDD also M3
- CubeSat Kit solar panel clips and chassis also M3
- DIN 965 / ISO 7046 countersunk Phillips screw also M3
- DIN 912 socket-head cap screw also M3
Questions about Generic hex socket button head screw (ISO 7380-1) screws
- What size screw does Generic hex socket button head screw (ISO 7380-1) use?
- M3 for ISO 7380-1:2011/2022 specifies hex socket button head screws for thread sizes from M3 up to and including M16, with thread tolerance 5g6g (property class 12.9) or 6g (other classes).
- How long are the screws in Generic hex socket button head screw (ISO 7380-1)?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- 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 Generic hex socket button head screw (ISO 7380-1)?
- The source lists a Hex socket (Allen) 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.