Olympus BH-2 microscope frame screw size
M3 · 4 to 10 mm long
Olympus BH-2 microscope frame takes M3 metric screws in lengths from 4 to 10 mm.
Where it is used: parts code AWU 3X4SA = M3x4mm frame screw; AB3X10SA = M3x10mm; AHU3X8SA = M3x8mm.
This entry is marked likely and comes from frankshospitalworkshop.com.
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Olympus BH-2 microscope frame 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 |
|---|---|---|---|---|---|---|
| M3 | 4–10 mm | 0.5 mm | not stated | not stated | Parts code AWU 3X4SA = M3x4mm frame screw; AB3X10SA = M3x10mm; AHU3X8SA = M3x8mm | Likely |
Fitment records and sources
Parts code AWU 3X4SA = M3x4mm frame screw; AB3X10SA = M3x10mm; AHU3X8SA = M3x8mm
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 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 4–10 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- Part numbers can embed a thread code (e.g. ifm fibre fittings with 'M3') that refers to a fitting thread, not a chassis screw.
- M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.
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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M3 x 4mm Phillips Wafer Head Screws for 2.5 SATA SSD Mounting 10-Pack
$4.99 -
M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack
$4.99 -
M3 x 5mm Phillips Wafer Head Screw for Electronics & Project Box Repair - Pack of 50 Black
$4.79 each · min. 2
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M3 x 6mm Replacement Screws for XLR Audio Connectors Phillips Wafer Head 50-Pack
$4.99 -
M3 x 6mm Phillips Wafer Head Carbon Steel Machine Screws for XLR Audio Connectors | 50-Pack (Black)
$4.99
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M3 x 4mm Phillips Wafer Head Screws for HDD Caddy Bracket 10-Pack
$4.99 -
M3 x 4mm Phillips Wafer Head Screws for SSD Hard Drive 10-Pack Black
$4.99 -
M3 x 10mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
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Devices whose records share a thread with Olympus BH-2 microscope frame, closest length match first.
- Aimpoint Micro T-1/T-2/H-1/H-2 standard mount screw also M3 × 4 mm
- Wimberley Arca-Swiss replacement feet (AP-500/600 series) also M3 × 6 mm
- Wimberley AP-640 replacement lens foot also M3 × 6–8 mm
- Glock MOS adapter plate to slide (Docter/Meopta/Insight/Vortex/Burris footprint) also M3 × 6 mm
- Telescope thumb screws for diagonals, adapters and focusers also M3 × 7–8 mm
- Wimberley P-20 Arca-Swiss style tripod lens plate also M3 × 6 mm
- Microscope objective turret and stage also M3 × 6–10 mm
- Aimpoint SM-2001/2007 Micro T1/T2 mount also M3 × 6 mm
Questions about Olympus BH-2 microscope frame screws
- What size screw does Olympus BH-2 microscope frame use?
- M3 × 4–10 mm for parts code AWU 3X4SA = M3x4mm frame screw; AB3X10SA = M3x10mm; AHU3X8SA = M3x8mm.
- How long are the screws in Olympus BH-2 microscope frame?
- The records range from 4 to 10 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Olympus BH-2 microscope frame?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Olympus BH-2 microscope frame?
- TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.