Ortofon 2M cartridge screw size
M2.5 · 5 to 7 mm long
If you are replacing a screw on Ortofon 2M cartridge, the thread is M2.5 in lengths from 5 to 7 mm.
The record covers screws sold by Ortofon for mounting 2M cartridge to headshell.
This entry is marked confirmed and comes from ortofon.com.
M2.5 means a 2.5 mm nominal diameter with a 0.45 mm thread pitch. 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.
Ortofon 2M cartridge 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 | 5–7 mm | 0.45 mm | not stated | not stated | Screws sold by Ortofon for mounting 2M cartridge to headshell | Confirmed |
Fitment records and sources
Screws sold by Ortofon for mounting 2M cartridge to headshell
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- On vehicles and bikes, use the original strength class and finish; outdoor hardware is usually stainless or coated to resist corrosion.
- 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 records span 5–7 mm, which means different positions take different lengths — match each hole to its own screw.
- 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 and M2.5 are both marketed for turntable headshells; buyers must check which their specific cartridge/tonearm brand uses.
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
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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ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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Devices whose records share a thread with Ortofon 2M cartridge, closest length match first.
- Tonar cartridge screw set for phono cartridges also M2.5 × 5–6 mm
- Turntable headshell / phono cartridge mounting screws also M2.5 × 5–7 mm
- NVIDIA Jetson Nano Developer Kit carrier board also M2.5 × 6–7 mm
- VinylPro aluminium cartridge kit also M2.5 × 6–7 mm
- Turntable headshell / phono cartridge mounting also M2.5 × 5–7 mm
- Fishing reel handle lock nut also M2.5 × 5–7 mm
- Turntable cartridge mounting kit (retail) also M2.5 × 5–7 mm
- Dive computer strap / bezel also M2.5 × 5–6 mm
Questions about Ortofon 2M cartridge screws
- What size screw does Ortofon 2M cartridge use?
- M2.5 × 5–7 mm for screws sold by Ortofon for mounting 2M cartridge to headshell.
- How long are the screws in Ortofon 2M cartridge?
- The records range from 5 to 7 mm depending on the position, so match each screw to its own hole.
- 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 Ortofon 2M cartridge?
- 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.
- Where can I buy replacement screws for Ortofon 2M cartridge?
- TechSpareWarehouse (our own store) lists M2.5 x 5mm and M2.5 x 6mm, which match lengths in the records above.