Ophthalmic instrument service hardware (Duclos Lenses) screw size
M2 · 2 mm long
Ophthalmic instrument service hardware (Duclos Lenses) takes M2 metric screws, 2 mm long.
The record covers M2 x 2mm slotted set screw sold as instrument service part.
Head and drive, as the source states them: set screw (headless) head and Slotted drive.
This entry is marked likely and comes from parts.ducloslenses.com.
M2 means a 2 mm nominal diameter with a 0.4 mm thread pitch. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Ophthalmic instrument service hardware (Duclos Lenses) 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 | 2 mm | 0.4 mm | Set screw (headless) | Slotted | M2 x 2mm slotted set screw sold as instrument service part | Likely |
Fitment records and sources
M2 x 2mm slotted set screw sold as instrument service part
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: for set screw (headless) screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The record states 2 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source names a Slotted drive. For comparison, standard M2 heads take PH0 (Phillips) or T6 (Torx), or a 1.5 mm hex key.
- 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
- 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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Questions about Ophthalmic instrument service hardware (Duclos Lenses) screws
- What size screw does Ophthalmic instrument service hardware (Duclos Lenses) use?
- M2 × 2 mm for M2 x 2mm slotted set screw sold as instrument service part.
- How long are the screws in Ophthalmic instrument service hardware (Duclos Lenses)?
- The record gives 2 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 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 Ophthalmic instrument service hardware (Duclos Lenses)?
- The source lists a Slotted drive. Standard M2 heads otherwise take PH0 (Phillips) or T6 (Torx), or 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 Ophthalmic instrument service hardware (Duclos Lenses)?
- TechSpareWarehouse (our own store) lists M2 x 2mm, which matches the length in the records above.