How long are the screws in D-Sub connector jackscrew?

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 D-Sub connector jackscrew?

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.

D-Sub connector jackscrew screw size

M2.5 · length not stated in the sources

If you are replacing a screw on D-Sub connector jackscrew, the thread is M2.5. None of the sources we found gives an exact length, so measure the original before you order.

It is listed for ossi D-JS/D-JSS jackscrew accessory listed with M2.5 thread option, torque 50-130 Ncm.

This entry is marked confirmed and comes from ossi.dk.

An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; 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.

D-Sub connector jackscrew screw specifications

One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.

Thread	Length	Pitch	Head	Drive	Torque	Where it goes	Status
M2.5	not stated	0.45 mm	not stated	not stated	50-130 Ncm	Ossi D-JS/D-JSS jackscrew accessory listed with M2.5 thread option, torque 50-130 Ncm	Confirmed

Fitment records and sources

M2.5per kitconfirmed

Ossi D-JS/D-JSS jackscrew accessory listed with M2.5 thread option, torque 50-130 Ncm

pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8

Source

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.

Common mix-ups with M2.5

Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.

Pitch gauge · Screw size finder · Torque guide

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The same screw also fits

Devices whose records share a thread with D-Sub connector jackscrew, closest length match first.

GE Healthcare Maternal Infant Care service part 6600-0715-403 also M2.5
ASUS ZenBook / VivoBook / TUF also M2.5
SINLIN/FCT D-Sub connector jackscrew also M2.5
MH Connectors MHT-JS-M2.5MH turned jackscrew also M2.5
Raspberry Pi HAT+ specification also M2.5
MH Connectors MHT-JS-M2.5 D-Sub jackscrew also M2.5
UCTRONICS U6264 1U Raspberry Pi rack mount also M2.5
Ossi D-Sub jackscrew (D-JS/D-JSS) also M2.5

Questions about D-Sub connector jackscrew screws

What size screw does D-Sub connector jackscrew use?: M2.5 for ossi D-JS/D-JSS jackscrew accessory listed with M2.5 thread option, torque 50-130 Ncm.
How long are the screws in D-Sub connector jackscrew?: 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 D-Sub connector jackscrew?: 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.
How tight should the M2.5 screw on D-Sub connector jackscrew be?: The source gives 50-130 Ncm for ossi D-JS/D-JSS jackscrew accessory listed with M2.5 thread option, torque 50-130 Ncm.

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