Ossi D-Sub jackscrew (D-JS/D-JSS) screw size
M2.5 · length not stated in the sources
The screws used on Ossi D-Sub jackscrew (D-JS/D-JSS) are M2.5. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for D-Sub connector backshell locking jackscrew.
This entry is marked confirmed and comes from ossi.dk D-Sub accessories datasheet.
For reference, M2.5 is 2.5 mm across the threads at 0.45 mm pitch. The imperial size people confuse it with: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Ossi D-Sub jackscrew (D-JS/D-JSS) 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 |
|---|---|---|---|---|---|---|
| M2.5 | not stated | 0.45 mm | not stated | not stated | D-Sub connector backshell locking jackscrew | Confirmed |
Fitment records and sources
D-Sub connector backshell locking jackscrew
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
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 M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 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.
- Driver: the source does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 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 M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- Nylon-coated M2.5 screws (ThinkPad Edge) are thread-locking; plain replacements work loose over time.
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
More in Electronics, Racks & Enclosures
The same screw also fits
Devices whose records share a thread with Ossi D-Sub jackscrew (D-JS/D-JSS), closest length match first.
- Eurorack module/rail mounting screw also M2.5
- UCTRONICS U6264 1U Raspberry Pi rack mount also M2.5
- ASUS ZenBook / VivoBook / TUF also M2.5
- D-Sub connector jackscrew also M2.5
- GE Healthcare Maternal Infant Care service part 6600-0715-403 also M2.5
- MH Connectors MHT-JS-M2.5 D-Sub jackscrew also M2.5
- Raspberry Pi HAT+ specification also M2.5
- MH Connectors MHT-JS-M2.5MH turned jackscrew also M2.5
Questions about Ossi D-Sub jackscrew (D-JS/D-JSS) screws
- What size screw does Ossi D-Sub jackscrew (D-JS/D-JSS) use?
- M2.5 for D-Sub connector backshell locking jackscrew.
- How long are the screws in Ossi D-Sub jackscrew (D-JS/D-JSS)?
- 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 M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Ossi D-Sub jackscrew (D-JS/D-JSS)?
- The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.