SINLIN/FCT D-Sub connector jackscrew screw size
M2.5 · 15.5 mm long
The screws used on SINLIN/FCT D-Sub connector jackscrew are M2.5, 15.5 mm long.
The record covers D-Sub jackscrew used in controller wiring harnesses, 15.5 mm variant.
This entry is marked confirmed and comes from sinlinelec.com.
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.
SINLIN/FCT D-Sub connector jackscrew 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 | 15.5 mm | 0.45 mm | not stated | not stated | D-Sub jackscrew used in controller wiring harnesses, 15.5 mm variant | Confirmed |
Fitment records and sources
D-Sub jackscrew used in controller wiring harnesses, 15.5 mm variant
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.
- The record states 15.5 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- 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
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
- M2.5 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.
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Devices whose records share a thread with SINLIN/FCT D-Sub connector jackscrew, closest length match first.
- Wurth Elektronik WA-SPAIE plastic spacer stud also M2.5 × 15.5 mm
- Wurth Elektronik WA-SSTIE steel spacer stud also M2.5 × 15.5 mm
- Raspberry Pi 3B / 4B / 5 / Zero 2 standoff kits also M2.5 × 15.5 mm
- Lab balance leveling foot also M2.5 × 15.5 mm
- Motorola APX 5000 / APX 6000 portable radio also M2.5 × 15.5 mm
- Raspberry Pi (Model B+ through Pi 4/Pi 5 form factor boards) also M2.5 × 15.5 mm
- DIN 912 socket-head cap screw also M2.5 × 15.5 mm
- Axial SCX10 III RC crawler, countersunk and cap screws also M2.5 × 15.5 mm
Questions about SINLIN/FCT D-Sub connector jackscrew screws
- What size screw does SINLIN/FCT D-Sub connector jackscrew use?
- M2.5 × 15.5 mm for D-Sub jackscrew used in controller wiring harnesses, 15.5 mm variant.
- How long are the screws in SINLIN/FCT D-Sub connector jackscrew?
- The record gives 15.5 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 SINLIN/FCT 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.