Olympus BH-2 / BH2-5RE microscope nosepiece screw size
M2 · 3 to 4 mm long
Olympus BH-2 / BH2-5RE microscope nosepiece takes M2 metric screws in lengths from 3 to 4 mm.
It is listed for M2 x 3mm and M2 x 4mm pan head and countersunk screws hold the objective turret retaining ring.
Head and drive, as the source states them: flat / countersunk head.
This entry is marked confirmed and comes from alanwood.net.
An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Olympus BH-2 / BH2-5RE microscope nosepiece 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 | 3–4 mm | 0.4 mm | Flat / countersunk | not stated | M2 x 3mm and M2 x 4mm pan head and countersunk screws hold the objective turret retaining ring | Confirmed |
Fitment records and sources
M2 x 3mm and M2 x 4mm pan head and countersunk screws hold the objective turret retaining ring
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
How to check the screw before you buy
- Do not confuse metric mounting screws with the 1/4-20 or 3/8-16 tripod threads that cameras and clamps also carry.
- Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.4 mm from one thread crest to the next (25 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The records span 3–4 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 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2
- Olympus part codes like 3PUK2X8SA encode diameter x length by convention, not by an ISO stamp — verify with a thread gauge before ordering.
- M2 (2.00mm, 0.4mm pitch) is NOT the same as #2-56 UNC (2.18mm) — close enough to cross-thread and strip if forced.
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 Olympus BH-2 / BH2-5RE microscope nosepiece, closest length match first.
- Some Nikkor lens mounts also M2 × 4 mm
- DJI Mavic Pro gimbal/camera mounting screws also M2 × 3 mm
- Riflescope turret cap also M2 × 3–4 mm
- Lab microscope adjustment screws also M2 × 4 mm
- Webcam lens housing and board also M2 × 3–4 mm
- Olympus BH-PRE microscope nosepiece also M2 × 3 mm
- Camera lens focus ring set screw also M2 × 3–4 mm
- Raspberry Pi Camera Module also M2 × 4 mm
Questions about Olympus BH-2 / BH2-5RE microscope nosepiece screws
- What size screw does Olympus BH-2 / BH2-5RE microscope nosepiece use?
- M2 × 3–4 mm for M2 x 3mm and M2 x 4mm pan head and countersunk screws hold the objective turret retaining ring.
- How long are the screws in Olympus BH-2 / BH2-5RE microscope nosepiece?
- The records range from 3 to 4 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2 screw?
- 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
- What screwdriver do I need for Olympus BH-2 / BH2-5RE microscope nosepiece?
- The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M2?
- No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Olympus BH-2 / BH2-5RE microscope nosepiece?
- TechSpareWarehouse (our own store) lists M2 x 3mm and M2 x 4mm, which match lengths in the records above.