19in equipment rack (Kendall Howard cage nuts) screw size
M5 / M6 · length not stated in the sources
Our records put 19in equipment rack (Kendall Howard cage nuts) on M5 and M6 screws. None of the sources we found gives an exact length, so measure the original before you order.
There are 2 separate fitment records for it, including universal rack cage nuts offered in M5 for rack-mount audio and network equipment (M5) and universal rack cage nuts offered in M6 as well as M5 and imperial threads for rack-mount a (M6).
2 of the 2 records are marked confirmed, drawn from 1 source (discount-low-voltage.com).
An M5 screw is 5 mm in diameter with a 0.8 mm pitch, tapped with a 4.2 mm drill; imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
19in equipment rack (Kendall Howard cage nuts) 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 | Universal rack cage nuts offered in M5 for rack-mount audio and network equipment | Confirmed |
| M6 | not stated | 1 mm | not stated | not stated | Universal rack cage nuts offered in M6 as well as M5 and imperial threads for rack-mount audio/server gear | Confirmed |
Fitment records and sources
Universal rack cage nuts offered in M5 for rack-mount audio and network equipment
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
Universal rack cage nuts offered in M6 as well as M5 and imperial threads for rack-mount audio/server gear
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
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 M5 screw measures about 5 mm with calipers (usually a hair under). This device also uses M6, so measure each screw rather than assuming they match.
- 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 / M6
- 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.
- Rack cage-nut screws for audio gear are usually M6, but the same rack may also take 10-32 or 12-24 imperial screws.
- Tapped 19in rack rails are traditionally 10-32 or 12-24 imperial; M6 is the cage-nut convention for square-hole rails, not an EIA requirement.
More in Electronics, Racks & Enclosures
The same screw also fits
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Questions about 19in equipment rack (Kendall Howard cage nuts) screws
- What size screw does 19in equipment rack (Kendall Howard cage nuts) use?
- M5 for universal rack cage nuts offered in M5 for rack-mount audio and network equipment; M6 for universal rack cage nuts offered in M6 as well as M5 and imperial threads for rack-mount audio/server gear.
- How long are the screws in 19in equipment rack (Kendall Howard cage nuts)?
- 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 equipment rack (Kendall Howard cage nuts)?
- 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.