DIN rail terminal block (6x9mm series) screw size
M4 · length not stated in the sources
If you are replacing a screw on DIN rail terminal block (6x9mm series), the thread is M4. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: brass DIN rail terminal blocks with M4 screw terminals.
This entry is marked confirmed and comes from viox.com.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
DIN rail terminal block (6x9mm series) 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 |
|---|---|---|---|---|---|---|
| M4 | not stated | 0.7 mm | not stated | not stated | Brass DIN rail terminal blocks with M4 screw terminals | Confirmed |
Fitment records and sources
Brass DIN rail terminal blocks with M4 screw terminals
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- On vehicles and bikes, use the original strength class and finish; outdoor hardware is usually stainless or coated to resist corrosion.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 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 M4 heads take PH2 for Phillips and T20 for Torx, and a 3 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 M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- There is no single standard Picatinny/rail screw size; makers use metric M3/M4 and imperial 6-48 or 8-40 interchangeably. Always measure the existing screw.
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
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Devices whose records share a thread with DIN rail terminal block (6x9mm series), closest length match first.
- Innovative Control Systems Tunnel Master WBC car wash controller cabinet also M4
- IPS Group M5 Single-Space Smart Parking Meter mechanism retrofit module also M4
- Trek Speed Concept stem faceplate bolt also M4
- VMAC Multifunction Power System D600007 also M4
- Shimano Ultegra RD-6700 rear derailleur also M4
- Siemens SIMATIC S7-1500 DIN rail adapter also M4
- Winter mechanical flight instruments (glider panel) also M4
- LXNAV V8 vario instrument screw also M4
Questions about DIN rail terminal block (6x9mm series) screws
- What size screw does DIN rail terminal block (6x9mm series) use?
- M4 for brass DIN rail terminal blocks with M4 screw terminals.
- How long are the screws in DIN rail terminal block (6x9mm series)?
- 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 M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for DIN rail terminal block (6x9mm series)?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.