Keystone Electronics metric nylon standoff screw size
M2.5 / M3 / M4 · 4 to 11 mm long
Keystone Electronics metric nylon standoff takes M2.5, M3 and M4 metric screws in lengths from 4 to 11 mm.
There are 3 separate fitment records for it, including PCB standoff spacer (M2.5), PCB standoff spacer (M3) and PCB standoff spacer (M4).
3 of the 3 records are marked confirmed, drawn from 3 sources (Keystone Catalog K75 2025 p.87 / M60.2 p.72, Keystone Catalog M60.2 p.72 and Keystone Catalog K75 2025 p.87).
An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Keystone Electronics metric nylon standoff 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 |
|---|---|---|---|---|---|---|
| M2.5 | 4–5 mm | 0.45 mm | not stated | not stated | PCB standoff spacer | Confirmed |
| M3 | 8 mm | 0.5 mm | not stated | not stated | PCB standoff spacer | Confirmed |
| M4 | 10–11 mm | 0.7 mm | not stated | not stated | PCB standoff spacer | Confirmed |
Fitment records and sources
PCB standoff spacer
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Source: Keystone Catalog K75 2025 p.87 / M60.2 p.72
PCB standoff spacer
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Source: Keystone Catalog M60.2 p.72
PCB standoff spacer
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
Source: Keystone Catalog K75 2025 p.87
How to check the screw before you buy
- Rack and enclosure hardware mixes metric and imperial (#8-32, #10-32, #6-32), so confirm the thread before forcing a screw.
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). This device also uses M3 / M4, so measure each screw rather than assuming they match.
- Pitch: 0.45 mm from one thread crest to the next (22.22 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 4–11 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 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 M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5 / M3 / M4
- Commonly confused with imperial 4-40 screws in older medical equipment, but modern GE/Mindray devices explicitly list M2.5 metric threads.
- Intel's ATX and microATX specs never state a metric standoff thread; PC motherboard standoffs are usually imperial 6-32, and PC fan screws are commonly 6-32 self-tapping.
- Archery bow sights (NYTRX, Tetra, Engage) use imperial #10-24 screws — '10-24' is not a metric callout.
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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Devices whose records share a thread with Keystone Electronics metric nylon standoff, closest length match first.
- Neopost/Paper-Machines 7104 Series High-Volume Modular Inserter (mailroom sorting/inserting machine) also M4 × 10 mm
- HP EliteBook 725 G3 also M2.5 × 4–5 mm
- Eurorack panel jacks and pots also M3 × 8 mm
- UniFi rack shelf and tray hardware also M4 × 10–11 mm
- Elo E458992 EMV PIN Pad Mounting Kit (for Verifone MX915/M400, Ingenico ISC250, Square) also M3 × 8 mm
- Electronics enclosures also M4 × 10–11 mm
- EVoCharge EVSE charging station (EV charging kiosk electronics enclosure) also M4 × 10 mm
- HP Pavilion also M2.5 × 4–5 mm
Questions about Keystone Electronics metric nylon standoff screws
- What size screw does Keystone Electronics metric nylon standoff use?
- M2.5 × 4–5 mm for PCB standoff spacer; M3 × 8 mm for PCB standoff spacer; M4 × 10–11 mm for PCB standoff spacer.
- How long are the screws in Keystone Electronics metric nylon standoff?
- The records range from 4 to 11 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Keystone Electronics metric nylon standoff?
- The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Keystone Electronics metric nylon standoff?
- TechSpareWarehouse (our own store) lists M2.5 x 4mm, M2.5 x 5mm and M3 x 8mm, which match lengths in the records above.