Supermicro SSE-F3548S / F3548SR switch screw size
M3 / M4 / M5 · length not stated in the sources
Supermicro SSE-F3548S / F3548SR switch takes M3, M4 and M5 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
There are 3 separate fitment records for it, including inner rails to the switch chassis use M3 and M4 flat-head screws; a pan-head M3 locks the (M3), flat-head M4 screws in the rail kit (kit lists M3 flat x2, M3 pan x4, M4 flat x2, M5 x10) (M4) and outer rail sleeves/riders and the inner rail lock to the rack posts with M5 screws (ten su (M5).
Head and drive, as the sources state them: flat / countersunk head.
3 of the 3 records are marked confirmed, drawn from 1 source (supermicro.com).
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Supermicro SSE-F3548S / F3548SR switch 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 | Flat / countersunk | not stated | Inner rails to the switch chassis use M3 and M4 flat-head screws; a pan-head M3 locks the cable-management holder to the rear post | Confirmed |
| M4 | not stated | 0.7 mm | Flat / countersunk | not stated | Flat-head M4 screws in the rail kit (kit lists M3 flat x2, M3 pan x4, M4 flat x2, M5 x10) | Confirmed |
| M5 | not stated | 0.8 mm | not stated | not stated | Outer rail sleeves/riders and the inner rail lock to the rack posts with M5 screws (ten supplied) | Confirmed |
Fitment records and sources
Inner rails to the switch chassis use M3 and M4 flat-head screws; a pan-head M3 locks the cable-management holder to the rear post
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Flat-head M4 screws in the rail kit (kit lists M3 flat x2, M3 pan x4, M4 flat x2, M5 x10)
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
Outer rail sleeves/riders and the inner rail lock to the rack posts with M5 screws (ten supplied)
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
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 / M5, 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: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- 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 / M5
- Eurorack is a strong known case with two competing metric standards (M2.5 for Vector rails, M3 for Schroff/DIN-style and 3U threaded rails); mixing rail types requires matching screw/nut thread.
- Some rackmount KVM switch kits pair M4x10 bracket-to-rack screws with M3.2x4.5 bracket-to-chassis screws (non-standard M3.2, not a true M3), so kits are not fully interchangeable with generic M3/M4 hardware.
- GoPro also uses M5 for its classic two-prong mount thumbscrew and buckle system, while smaller GoPro chassis screws are commonly Torx-driven without a confirmed metric thread in available sources — don't conflate the mount thumbscrew size with internal chassis screws.
More in Electronics, Racks & Enclosures
The same screw also fits
Devices whose records share a thread with Supermicro SSE-F3548S / F3548SR switch, closest length match first.
- Electrolux Professional compact rack-type dishwasher also M3
- Rittal DK 7094130 19-inch rack assembly screw for components and blanking plates also M5
- Oracle MICROS Universal PED kiosk mount also M3
- D-Sub connector jackscrew (M3 option) also M3
- Hach SC4500 universal controller also M5
- Dell PowerEdge R7525 also M3
- Weidmuller W-series terminal blocks also M3
- Omron E3T ultracompact photoelectric sensor (used for conveyor/AGV object detection) also M3
Questions about Supermicro SSE-F3548S / F3548SR switch screws
- What size screw does Supermicro SSE-F3548S / F3548SR switch use?
- M3 for inner rails to the switch chassis use M3 and M4 flat-head screws; a pan-head M3 locks the cable-management holder to the rear post; M4 for flat-head M4 screws in the rail kit (kit lists M3 flat x2, M3 pan x4, M4 flat x2, M5 x10); M5 for outer rail sleeves/riders and the inner rail lock to the rack posts with M5 screws (ten supplied).
- How long are the screws in Supermicro SSE-F3548S / F3548SR switch?
- 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 Supermicro SSE-F3548S / F3548SR switch?
- 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.