NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC) screw size
M3 · 5 to 16 mm long
If you are replacing a screw on NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC), the thread is M3 in lengths from 5 to 16 mm.
Where it is used: spec table explicitly lists 'M (Coarse) Nominal of Thread: M3' for chemical-polished cleanroom fastener, lengths 5-16mm.
This entry is marked confirmed and comes from nbk1560.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.
NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC) 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 | 5–16 mm | 0.5 mm | not stated | not stated | Spec table explicitly lists 'M (Coarse) Nominal of Thread: M3' for chemical-polished cleanroom fastener, lengths 5-16mm | Confirmed |
Fitment records and sources
Spec table explicitly lists 'M (Coarse) Nominal of Thread: M3' for chemical-polished cleanroom fastener, lengths 5-16mm
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
- 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 5–16 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
- M3 is by far the most common metric fastener across lab, metrology, and cleanroom equipment, spanning coarse-thread ISO M3x0.5 in most cases.
- Cleanroom/vacuum-rated M3 screws (titanium, vented, low-outgas) from NBK are a distinct specialty class, priced and sourced very differently from commodity M3 hardware — do not substitute one for the other in semiconductor fixtures.
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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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 8mm Screws for Leather Spike Attachments Guitar Straps 10-Pack
$4.99 -
M3 x 8mm Phillips Wafer Head Screw for SLA Resin 3D Printer VAT Film - Single Replacement Black
$0.10 each · min. 50
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M3 x 6mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
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M3 x 6mm Phillips Wafer Head Screw for Boutique Guitar Pedal Enclosure - Single Replacement Black
$0.10 each · min. 50
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M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 100-Pack for RC & 3D Printers
$9.99
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Browse all 2799 in Laptops & PCs →The same screw also fits
Devices whose records share a thread with NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC), closest length match first.
- Lenovo ThinkPad T520 also M3 × 5 mm
- HP EliteBook 8560p also M3 × 5 mm
- Dell Inspiron 4150 also M3 × 5 mm
- HP Compaq nw8240 Mobile Workstation also M3 × 5 mm
- Lenovo ThinkPad T530 also M3 × 5 mm
- Phanteks Enthoo Pro II PC case also M3 × 5 mm
- Dell Inspiron 4100 also M3 × 5 mm
- PC watercooling radiator fan screws also M3 × 12–16 mm
Questions about NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC) screws
- What size screw does NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC) use?
- M3 × 5–16 mm for spec table explicitly lists 'M (Coarse) Nominal of Thread: M3' for chemical-polished cleanroom fastener, lengths 5-16mm.
- How long are the screws in NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC)?
- The records range from 5 to 16 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 NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC)?
- 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 NBK cleanroom vented captive-washer screw (SVSI1S-M3-PC)?
- TechSpareWarehouse (our own store) lists M3 x 5mm, M3 x 6mm and M3 x 8mm, which match lengths in the records above.