How long are the screws in Philips System One CPAP housing?

The records range from 8 to 12 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 Philips System One CPAP housing?

The source lists a Phillips drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or 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 Philips System One CPAP housing?

TechSpareWarehouse (our own store) lists M3 x 8mm, M3 x 10mm and M3 x 12mm, which match lengths in the records above.

Philips System One CPAP housing screw size

M3 · 8 to 12 mm long

The screws used on Philips System One CPAP housing are M3 in lengths from 8 to 12 mm.

Where it is used: disassembly writeup shows small Phillips machine screws on housing and blower.

Head and drive, as the source states them: Phillips drive.

This entry is marked reported and comes from dontai.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.

Philips System One CPAP housing 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	8–12 mm	0.5 mm	not stated	Phillips	Disassembly writeup shows small Phillips machine screws on housing and blower	Reported

Fitment records and sources

M38-12mmreported

Disassembly writeup shows small Phillips machine screws on housing and blower

pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10

Source

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 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 8–12 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source names a Phillips drive. For comparison, standard M3 heads take PH1 (Phillips) or T10 (Torx), or a 2.5 mm hex key.
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

Power-tool gearcase and clamshell screws are usually thread-forming (marked "ST") even when the parts list gives an M-size — a normal machine screw of the same size may not hold in the plastic boss.
GE patient monitors often use 'PT 3x10mm' screws; these are thread-forming screws for plastic and are NOT standard M3 machine threads.

Pitch gauge · Screw size finder · Torque guide

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 Philips System One CPAP housing, closest length match first.

Agilent 8453 UV-Visible spectrophotometer also M3 × 8 mm
Agilent 1100 LC/MSD mass spectrometer also M3 × 8–12 mm
Fresenius Medical Care 2008 Series hemodialysis machine also M3 × 10 mm
SISAB ECO.50+/T laboratory centrifuge also M3 × 8 mm
Surgical / veterinary instrument handles also M3 × 8–10 mm
TSC MH241 / MH341 / MH641 industrial label printer also M3 × 8 mm
Kaycee Microfish veterinary tube-feed repeater syringe also M3 × 12 mm
BMC RESmart CPAP machine also M3 × 10 mm

Questions about Philips System One CPAP housing screws

What size screw does Philips System One CPAP housing use?: M3 × 8–12 mm for disassembly writeup shows small Phillips machine screws on housing and blower.
How long are the screws in Philips System One CPAP housing?: The records range from 8 to 12 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 Philips System One CPAP housing?: The source lists a Phillips drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or 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 Philips System One CPAP housing?: TechSpareWarehouse (our own store) lists M3 x 8mm, M3 x 10mm and M3 x 12mm, which match lengths in the records above.

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