Weidmuller W-series terminal blocks screw size
M3 · length not stated in the sources
Weidmuller W-series terminal blocks takes M3 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for WZAF cross-connector is retained by an M3 mounting screw.
This entry is marked confirmed and comes from pes-group.co.uk.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Weidmuller W-series terminal blocks 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 | WZAF cross-connector is retained by an M3 mounting screw | Confirmed |
Fitment records and sources
WZAF cross-connector is retained by an M3 mounting screw
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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). If yours measures noticeably more or less, it is a different thread.
- 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
- DIN-rail terminal blocks are near-universally M3 across Dinkle, TE, Omron and RND, but torque differs (0.5-0.8 Nm) — over-torquing an M3 terminal screw strips it instantly.
- 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.
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Devices whose records share a thread with Weidmuller W-series terminal blocks, closest length match first.
- Dell PowerEdge R7525 also M3
- PEM self-clinching flush-head stud, sheet-metal enclosures (ATM/kiosk/POS chassis use case) also M3
- Omron E3T ultracompact photoelectric sensor (used for conveyor/AGV object detection) also M3
- Electrolux Professional compact rack-type dishwasher also M3
- Supermicro SSE-F3548S / F3548SR switch also M3
- Oracle MICROS Universal PED kiosk mount also M3
- D-Sub connector jackscrew (M3 option) also M3
- Samsung WA50M7450AW top-load washer service manual - control board/wire harness connector screws also M3
Questions about Weidmuller W-series terminal blocks screws
- What size screw does Weidmuller W-series terminal blocks use?
- M3 for WZAF cross-connector is retained by an M3 mounting screw.
- How long are the screws in Weidmuller W-series terminal blocks?
- 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 Weidmuller W-series terminal blocks?
- 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.