Kasuga/Misumi BN & BNH DIN-rail terminal blocks screw size
M3 / M4 · length not stated in the sources
Our records put Kasuga/Misumi BN & BNH DIN-rail terminal blocks on M3 and M4 screws. None of the sources we found gives an exact length, so measure the original before you order.
There are 2 separate fitment records for it, including M3 clamping screw option on the terminal block range (M3) and M4 clamping screw option on the larger blocks in the range (M4).
0 of the 2 records are marked confirmed, drawn from 1 source (us.misumi-ec.com).
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Kasuga/Misumi BN & BNH DIN-rail 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 | M3 clamping screw option on the terminal block range | Reported |
| M4 | not stated | 0.7 mm | not stated | not stated | M4 clamping screw option on the larger blocks in the range | Reported |
Fitment records and sources
M3 clamping screw option on the terminal block range
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
M4 clamping screw option on the larger blocks in the range
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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 M3 screw measures about 3 mm with calipers (usually a hair under). This device also uses M4, 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: 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 / M4
- 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.
- Terminal-block clamp screws have manufacturer-specific torque values — over-tightening cracks the block or crushes the wire.
- Grounding/earth-stud screws on hazardous-area (ATEX/IECEx) gas detectors are commonly M4 even though the enclosure body uses larger threaded glands — don't extrapolate the earth screw size to the whole unit.
- 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.
More in Vehicles, Marine & Mobility
The same screw also fits
Devices whose records share a thread with Kasuga/Misumi BN & BNH DIN-rail terminal blocks, closest length match first.
- Wago 869-301 end terminal block also M3
- Airgun scope/rail mount replacement screws also M3
- Segway-Ninebot Dashboard assembly screws (6 pcs) also M4
- Entrelec/ABB M4/6 feed-through terminal block also M4
- Segway-Ninebot Grade 10.9 structural screw (part 10.01.3188.00) also M4
- Garmin zumo XT Motorcycle mount base plate to handlebar mount (panhead screws) also M4
- DIN rail terminal block, M4 screw-terminal version also M4
- Phoenix Contact CHARX EV-T1CCS charging inlet repair kit also M4
Questions about Kasuga/Misumi BN & BNH DIN-rail terminal blocks screws
- What size screw does Kasuga/Misumi BN & BNH DIN-rail terminal blocks use?
- M3 for M3 clamping screw option on the terminal block range; M4 for M4 clamping screw option on the larger blocks in the range.
- How long are the screws in Kasuga/Misumi BN & BNH DIN-rail 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 Kasuga/Misumi BN & BNH DIN-rail 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.