Heavy flat-pack furniture screw size
M6 · 25 to 30 mm long
Heavy flat-pack furniture takes M6 metric screws in lengths from 25 to 30 mm.
It is listed for bed rails and table frame load-bearing joints.
This entry is marked reported.
M6 means a 6 mm nominal diameter with a 1 mm thread pitch. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.
Heavy 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 |
|---|---|---|---|---|---|---|
| M6 | 25–30 mm | 1 mm | not stated | not stated | bed rails and table frame load-bearing joints | Reported |
Fitment records and sources
bed rails and table frame load-bearing joints
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
How to check the screw before you buy
- Where the manufacturer publishes a torque value, use a torque driver rather than feel.
- Diameter: across the threads an M6 screw measures about 6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 1 mm from one thread crest to the next (10 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 25–30 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M6 heads take PH3 for Phillips and T30 for Torx, and a 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 M6 is about 7-10 N·m into metal threads and 2.5-4.0 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M6
- 19-inch rack rails use three incompatible thread standards that share the same square hole: M6, 10-32 UNF and 12-24 UNC. Cage nuts for all of them look identical in a parts bin.
- Server rack cage nuts come in M4/M5/M6 for the same square hole — confirm what your rails and equipment ears use.
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Devices whose records share a thread with Heavy flat-pack furniture, closest length match first.
- Motorcycle fairing panels also M6 × 25 mm
- Small boat deck hardware also M6 × 25 mm
- Exercise bike seat post clamp also M6 × 25–30 mm
- Gas grill cart and legs also M6 × 25–30 mm
- Pride Go-Go scooter tiller lock knob also M6 × 25 mm
- Kayak accessory rail T-bolt kit also M6 × 25 mm
- Bicycle disc caliper mount (post / IS) also M6 × 25–30 mm
- Table / mitre saw fence and rails also M6 × 25–30 mm
Questions about Heavy flat-pack furniture screws
- What size screw does Heavy flat-pack furniture use?
- M6 × 25–30 mm for bed rails and table frame load-bearing joints.
- How long are the screws in Heavy flat-pack furniture?
- The records range from 25 to 30 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M6 screw?
- 1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.
- What screwdriver do I need for Heavy flat-pack furniture?
- The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.
- Can I use an imperial screw instead of M6?
- No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.