Welch Allyn 6000 series vital signs monitor screw size
M3 / M4 · 5 to 10 mm long
Our records put Welch Allyn 6000 series vital signs monitor on M3 and M4 screws in lengths from 5 to 10 mm.
There are 3 separate fitment records for it, including radio board screw, M3 x 0.5 Phillips pan head (M3), pan head screw on main board / LCD frame area (M3) and pan head screws with NYLOC securing top/bottom housing (M4).
Head and drive, as the sources state them: pan head and Phillips drive.
3 of the 3 records are marked confirmed, drawn from 1 source (patientmonitors.prescottsmed.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.
Welch Allyn 6000 series vital signs monitor 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 | not stated | 0.5 mm | Pan head | Phillips | radio board screw, M3 x 0.5 Phillips pan head | Confirmed |
| M3 | 5 mm | 0.5 mm | Pan head | not stated | pan head screw on main board / LCD frame area | Confirmed |
| M4 | 10 mm | 0.7 mm | Pan head | not stated | pan head screws with NYLOC securing top/bottom housing | Confirmed |
Fitment records and sources
radio board screw, M3 x 0.5 Phillips pan head
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
pan head screw on main board / LCD frame area
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
pan head screws with NYLOC securing top/bottom housing
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- VESA holes are threaded inserts in the back cover; if a screw stops early, back it out rather than forcing it, because a bottomed-out screw can crack the panel housing.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). This device also uses M4, so measure each screw rather than assuming they match.
- 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: for pan head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 5–10 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 / M4
- Telescope thumbscrews are sold in a wide non-metric legacy range too (1/4-20, 8-32, 10-32 on many Meade/Celestron mounts), so metric M3/M4 fitment applies mainly to newer/international accessory ecosystems (SkyWatcher, generic 1.25" accessories) and should not be assumed universal.
- 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.
- Grounding/earth-stud screws on hazardous-area (ATEX/IECEx) gas detectors are commonly M4 even though the enclosure body uses larger threaded glands — don't extrapolate the earth screw size to the whole unit.
- Display mounts mix systems: the screen side is metric M4/M6, but the wall side of many mounts uses imperial wood screws such as #14 x 2.5in.
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 5mm Phillips Wafer Head Screw for Electronics & Project Box Repair - Pack of 50 Black
$4.79 each · min. 2
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M4 x 10mm Black Wafer Head Charging Port Screws for GOTRAX G3, G4, GMAX & GMAX Ultra – 10-Pack Replacement
$5.49Choose size -
M4 x 10mm Black Wafer Head Fender Clamp Base Screws for Minoura KODACHI DYK-1R Rear Fender – 8-Pack Replacement
$5.49Choose size
More in Displays, TVs & Mounts
The same screw also fits
Devices whose records share a thread with Welch Allyn 6000 series vital signs monitor, closest length match first.
- Dell UP2718Q also M4 × 10 mm
- Dell S2715H also M4 × 10 mm
- Dell P2419H also M4 × 10 mm
- Dell P2317HWH also M4 × 10 mm
- Dell P2414H also M4 × 10 mm
- Dell UZ2715H also M4 × 10 mm
- TV back panel also M4 × 10 mm
- Dell U3818DW also M4 × 10 mm
Questions about Welch Allyn 6000 series vital signs monitor screws
- What size screw does Welch Allyn 6000 series vital signs monitor use?
- M3 for radio board screw, M3 x 0.5 Phillips pan head; M3 × 5 mm for pan head screw on main board / LCD frame area; M4 × 10 mm for pan head screws with NYLOC securing top/bottom housing.
- How long are the screws in Welch Allyn 6000 series vital signs monitor?
- The records range from 5 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 Welch Allyn 6000 series vital signs monitor?
- 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 Welch Allyn 6000 series vital signs monitor?
- TechSpareWarehouse (our own store) lists M3 x 5mm, which matches the length in the records above.