Flat-pack furniture screw size
M5 · 20 to 30 mm long
Our records put Flat-pack furniture on M5 screws in lengths from 20 to 30 mm.
It is listed for hex socket bolts for bed frames and table legs.
Head and drive, as the source states them: Hex socket (Allen) drive.
This entry is marked reported.
M5 means a 5 mm nominal diameter with a 0.8 mm thread pitch. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Flat-pack furniture 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 | 20–30 mm | 0.8 mm | not stated | Hex socket (Allen) | hex socket bolts for bed frames and table legs | Reported |
Fitment records and sources
hex socket bolts for bed frames and table legs
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- If several screws hold the same part, check that they are all the same length before assuming they are.
- 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.
- The records span 20–30 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Hex socket (Allen) drive. For comparison, standard M5 heads take PH2 (Phillips) or T25 (Torx), or a 4 mm hex key.
- 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
- Shimano SPD cleat bolts are widely sold as M5 x 8, but Shimano's own dealer manuals don't state the thread — check the old bolt.
- Truss and stage-light clamps use M8 or M10 bolts depending on tube diameter — larger than anything in this database, so don't substitute an M6.
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Devices whose records share a thread with Flat-pack furniture, closest length match first.
- Disc brake caliper post-mount adapters also M5 × 20 mm
- Door lever through-bolts also M5 × 25–30 mm
- Eschmann LS5 / SES2555 autoclave also M5 × 20 mm
- TEKTELIC Kona Photon Gen-2 LoRaWAN gateway also M5 × 20–25 mm
- Bike rack & fender eyelets also M5 × 20 mm
- Stem faceplate bolts also M5 × 20–28 mm
- Leviton EV Series charging pedestal (EPED1 / EPED2) also M5 × 20–22 mm
- Pride Mobility power chairs / scooters also M5 × 30 mm
Questions about Flat-pack furniture screws
- What size screw does Flat-pack furniture use?
- M5 × 20–30 mm for hex socket bolts for bed frames and table legs.
- How long are the screws in Flat-pack furniture?
- The records range from 20 to 30 mm depending on the position, so match each screw to its own hole.
- 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 Flat-pack furniture?
- The source lists a Hex socket (Allen) drive. Standard M5 heads otherwise take PH2 (Phillips) or T25 (Torx), or 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.