19in rack cage nuts (alternate metric) screw size
M5 · length not stated in the sources
The screws used on 19in rack cage nuts (alternate metric) are M5. None of the sources we found gives an exact length, so measure the original before you order.
The record covers less common metric cage nut on some server rails.
This entry is marked reported and comes from alarmax.com.
For reference, M5 is 5 mm across the threads at 0.8 mm pitch. The imperial size people confuse it with: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
19in rack cage nuts (alternate metric) 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 |
|---|---|---|---|---|---|---|
| M5 | not stated | 0.8 mm | not stated | not stated | less common metric cage nut on some server rails | Reported |
Fitment records and sources
less common metric cage nut on some server rails
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
- Diameter: across the threads an M5 screw measures about 5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.8 mm from one thread crest to the next (12.5 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.
- Driver: the source does not name the drive. Standard M5 heads take PH2 for Phillips and T25 for Torx, and a 4 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 M5 is about 4.0-6.0 N·m into metal threads and 1.5-2.5 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M5
- APC Easy PDU rack-mount screws are self-tapping M5x10, intended for the PDU's own mounting brackets rather than standard rack cage-nut threads.
- Concept2 rowers/ergs look metric-friendly but use imperial 1/4-20 hardware throughout — M6 will NOT thread in; do not force it.
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Devices whose records share a thread with 19in rack cage nuts (alternate metric), closest length match first.
- Rack-mount network and AV equipment also M5
- Shelving brackets also M5
- Bike rack & fender eyelets also M5
- Alpha Series forklift mast bracket also M5
- Leviton EV Series charging pedestal (EPED1 / EPED2) also M5
- Fluke PPC4 rack mount kit (P/N 3338072) also M5
- Badger Meter M5000 Remote Junction Box Kit also M5
- RF Elements Twin Horn antenna bracket (secondary hardware) also M5
Questions about 19in rack cage nuts (alternate metric) screws
- What size screw does 19in rack cage nuts (alternate metric) use?
- M5 for less common metric cage nut on some server rails.
- How long are the screws in 19in rack cage nuts (alternate metric)?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- What is the thread pitch of an M5 screw?
- 0.8 mm (coarse), which is the standard pitch for M5 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 4.2 mm and the normal clearance hole is 5.5 mm.
- What screwdriver do I need for 19in rack cage nuts (alternate metric)?
- The sources do not name the drive. For M5, Phillips heads normally take PH2 and Torx heads T25; socket heads take a 4 mm hex key.
- Can I use an imperial screw instead of M5?
- No. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing. Use a true M5 screw so it does not cross-thread or strip the hole.