Bien-Air Dental Handpieces screw size
M1.2 / M3 / M4 · 2 to 45 mm long
If you are replacing a screw on Bien-Air Dental Handpieces, the thread is M1.2, M3 and M4 in lengths from 2 to 45 mm.
There are 3 separate fitment records for it, including headless screw used in handpiece assemblies (Item Code: 619.09.10-010) (M1.2), headless set screw for handpiece spare parts (M3) and cheese-head screw for handpiece assembly (M4).
Head and drive, as the sources state them: set screw (headless) head.
3 of the 3 records are marked confirmed, drawn from 1 source (elexadent.com).
For reference, M1.2 is 1.2 mm across the threads at 0.25 mm pitch. The imperial size people confuse it with: #0-80 UNF (1.52 mm) is the closest imperial screw, but it is bigger — not a substitute.
Bien-Air Dental Handpieces 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 |
|---|---|---|---|---|---|---|
| M1.2 | 2 mm | 0.25 mm | not stated | not stated | Headless screw used in handpiece assemblies (Item Code: 619.09.10-010) | Confirmed |
| M3 | 3 mm | 0.5 mm | Set screw (headless) | not stated | Headless set screw for handpiece spare parts | Confirmed |
| M4 | 45 mm | 0.7 mm | not stated | not stated | Cheese-head screw for handpiece assembly | Confirmed |
Fitment records and sources
Headless screw used in handpiece assemblies (Item Code: 619.09.10-010)
pitch 0.25 mm · tap 0.95 mm · clearance 1.4 mm · PH000 / JIS 00 / Torx T1–T2
Headless set screw for handpiece spare parts
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Cheese-head screw for handpiece assembly
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- For medical and lab equipment, use the manufacturer's replacement part where one is specified; the thread size here helps identify it, not certify it.
- Diameter: across the threads an M1.2 screw measures about 1.2 mm with calipers (usually a hair under). This device also uses M3 / M4, so measure each screw rather than assuming they match.
- Pitch: 0.25 mm from one thread crest to the next (40 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 records span 2–45 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M1.2 heads take PH000 / JIS 00 for Phillips and T1–T2 for Torx; 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 M1.2 is about 5-8 N·cm into metal threads and 3-5 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M1.2 / M3 / M4
- M1.2 and M1.4 look identical in an eyeglass repair kit — the wrong one strips soft acetate or metal hinges.
- Many gas-detector and sensor manuals only give a torque spec (e.g. '0.5 N·m max') without repeating the thread size at every mention — the explicit M3 callout is usually only in the accessories/spare-parts table, not the main installation steps.
- US-made pinball machines (Williams/Bally/Stern) overwhelmingly use imperial UTS threads (#6-32, #8-32, #10-32); explicit metric threads only appear on newer/import components such as Jersey Jack Pinball's Hobbit Smaug assembly (M3).
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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The same screw also fits
Devices whose records share a thread with Bien-Air Dental Handpieces, closest length match first.
- Wireless earbud charging case hinge also M1.2 × 2 mm
- Hearing aid battery door hinge also M1.2 × 2 mm
- Hearing aids also M1.2 × 2 mm
- HP 255 G5 also M3 × 3 mm
- LED video wall cabinet bezel and bracket-link screws also M3 × 3 mm
- Lenovo ideapad 330-14IGM also M3 × 3 mm
- HP 255 G4 also M3 × 3 mm
- Lenovo ThinkPad Edge E531 also M3 × 3 mm
Questions about Bien-Air Dental Handpieces screws
- What size screw does Bien-Air Dental Handpieces use?
- M1.2 × 2 mm for headless screw used in handpiece assemblies (Item Code: 619.09.10-010); M3 × 3 mm for headless set screw for handpiece spare parts; M4 × 45 mm for cheese-head screw for handpiece assembly.
- How long are the screws in Bien-Air Dental Handpieces?
- The records range from 2 to 45 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M1.2 screw?
- 0.25 mm (coarse), which is the standard pitch for M1.2 machine screws. The tap drill is 0.95 mm and the normal clearance hole is 1.4 mm.
- What screwdriver do I need for Bien-Air Dental Handpieces?
- The sources do not name the drive. For M1.2, Phillips heads normally take PH000 / JIS 00 and Torx heads T1–T2.
- Can I use an imperial screw instead of M1.2?
- No. Imperial look-alike: #0-80 UNF (1.52 mm) is the closest imperial screw, but it is bigger — not a substitute. Use a true M1.2 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Bien-Air Dental Handpieces?
- TechSpareWarehouse (our own store) lists M1.2 x 2mm and M3 x 3mm, which match lengths in the records above.