Hitachi SEM sample stubs screw size
M4 · length not stated in the sources
The screws used on Hitachi SEM sample stubs are M4. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: standard Hitachi stubs use an M4 threaded hole in the stub base.
This entry is marked confirmed and comes from microtonano.eu.
For reference, M4 is 4 mm across the threads at 0.7 mm pitch. The imperial size people confuse it with: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Hitachi SEM sample stubs 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 | Standard Hitachi stubs use an M4 threaded hole in the stub base | Confirmed |
Fitment records and sources
Standard Hitachi stubs use an M4 threaded hole in the stub base
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- For medical and lab equipment, use the manufacturer's replacement part where one is specified; the thread size here helps identify it, not certify it.
- 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
- SEM stub M4 threads are Hitachi-specific - JEOL and others use friction pins instead.
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
More in Medical & Laboratory
The same screw also fits
Devices whose records share a thread with Hitachi SEM sample stubs, closest length match first.
- HERMLE Z 327 K laboratory centrifuge also M4
- Vitali T5 dental unit also M4
- Belmont Eurus S6 Dental Unit also M4
- Kendro / Sorvall Legend T and Multifuge 3S/3L centrifuge also M4
- Takara Belmont PRO III 047 dental chair also M4
- TSC MH241 industrial label printer also M4
- cab XD4T industrial label printer also M4
- Midmark M9/M11 Sterilizer also M4
Questions about Hitachi SEM sample stubs screws
- What size screw does Hitachi SEM sample stubs use?
- M4 for standard Hitachi stubs use an M4 threaded hole in the stub base.
- How long are the screws in Hitachi SEM sample stubs?
- 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 Hitachi SEM sample stubs?
- 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.