Hammond 1555F enclosure screw size
M3 / M4 · length not stated in the sources
Hammond 1555F enclosure takes M3 and M4 metric 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 brass threaded insert for lid/panel mounting boss (M3) and brass threaded insert for lid/panel mounting boss (M4).
2 of the 2 records are marked confirmed, drawn from 1 source (hammfg.com 1555FGY.pdf).
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.
Hammond 1555F enclosure 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 | not stated | not stated | brass threaded insert for lid/panel mounting boss | Confirmed |
| M4 | not stated | 0.7 mm | not stated | not stated | brass threaded insert for lid/panel mounting boss | Confirmed |
Fitment records and sources
brass threaded insert for lid/panel mounting boss
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
brass threaded insert for lid/panel mounting boss
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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 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: 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 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 / M4
- M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.
- Bopla SHR-Z boss screws and Hammond 1591XXF screws look metric but are self-tapping/imperial — don't substitute a machine screw into those bosses.
- 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.
More in Electronics, Racks & Enclosures
The same screw also fits
Devices whose records share a thread with Hammond 1555F enclosure, closest length match first.
- Stinger SE-SDIN adapter bracket also M4
- Honeywell Vuquest 3310g barcode scanner also M3
- Instrument enclosure base/rear panel screws (Metcase Technomet-Control rack case) also M3
- Eurorack synthesiser case (Intellijel 7U Performance Case Gen 2) also M3
- Ubiquiti UniFi AP / UAP-LR ceiling & wall mount kit also M3
- kvmswitchtech Cat5 IP Matrix KVM Switch also M4
- Festo DASP-M4-125-A sensor bracket also M4
- Ubiquiti UniFi UAP-AC access point also M3
Questions about Hammond 1555F enclosure screws
- What size screw does Hammond 1555F enclosure use?
- M3 for brass threaded insert for lid/panel mounting boss; M4 for brass threaded insert for lid/panel mounting boss.
- How long are the screws in Hammond 1555F enclosure?
- 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 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 Hammond 1555F enclosure?
- 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.