Phono cartridge headshell mounting screws (Tonar universal set) screw size
M2.5 · 3 to 8 mm long
The screws used on Phono cartridge headshell mounting screws (Tonar universal set) are M2.5 in lengths from 3 to 8 mm.
The record covers product spec explicitly lists 'Screw type: M2.5 non-magnetic hardware' for mounting nearly any phono cartridge to headshell.
This entry is marked confirmed and comes from soundium.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.
Phono cartridge headshell mounting screws (Tonar universal set) 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 | 3–8 mm | 0.45 mm | not stated | not stated | Product spec explicitly lists 'Screw type: M2.5 non-magnetic hardware' for mounting nearly any phono cartridge to headshell | Confirmed |
Fitment records and sources
Product spec explicitly lists 'Screw type: M2.5 non-magnetic hardware' for mounting nearly any phono 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 3–8 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
- Commonly confused with imperial 4-40 screws in older medical equipment, but modern GE/Mindray devices explicitly list M2.5 metric threads.
- M2 and M2.5 are both marketed for turntable headshells; buyers must check which their specific cartridge/tonearm brand uses.
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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Devices whose records share a thread with Phono cartridge headshell mounting screws (Tonar universal set), closest length match first.
- Marine compass bezel also M2.5 × 5–8 mm
- Audio MusiKraft cartridge/headshell mounting kit also M2.5 × 3–8 mm
- Turntable cartridge mounting kit (retail) also M2.5 × 3–8 mm
- Dive computer strap / bezel also M2.5 × 3–6 mm
- Audio MusiKraft cartridge mounting screw kit also M2.5 × 3–8 mm
- NVIDIA Jetson Nano Developer Kit carrier board also M2.5 × 6–8 mm
- VinylPro aluminium cartridge kit also M2.5 × 6–8 mm
- Turntable headshell / phono cartridge mounting also M2.5 × 3–8 mm
Questions about Phono cartridge headshell mounting screws (Tonar universal set) screws
- What size screw does Phono cartridge headshell mounting screws (Tonar universal set) use?
- M2.5 × 3–8 mm for product spec explicitly lists 'Screw type: M2.5 non-magnetic hardware' for mounting nearly any phono cartridge to headshell.
- How long are the screws in Phono cartridge headshell mounting screws (Tonar universal set)?
- The records range from 3 to 8 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 Phono cartridge headshell mounting screws (Tonar universal set)?
- 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 Phono cartridge headshell mounting screws (Tonar universal set)?
- TechSpareWarehouse (our own store) lists M2.5 x 3mm, M2.5 x 4mm and M2.5 x 5mm, which match lengths in the records above.