Keystone metric hex PCB standoff (M4) screw size
M4 · length not stated in the sources
The screws used on Keystone metric hex PCB standoff (M4) are M4. None of the sources we found gives an exact length, so measure the original before you order.
The record covers same catalog lists 6.0 hex M4 thread standoffs with 9.5mm thread engagement.
This entry is marked confirmed and comes from yic-electronics.com.
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.
Keystone metric hex PCB standoff (M4) 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 | Same catalog lists 6.0 hex M4 thread standoffs with 9.5mm thread engagement | Confirmed |
Fitment records and sources
Same catalog lists 6.0 hex M4 thread standoffs with 9.5mm thread engagement
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
- 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
- Oster and Wahl clipper blade screws are often imperial #6-32, not metric - measure before assuming.
- Smart doorbell and lock kits bundle metric machine screws with imperial wood screws in the same bag; the metric ones are rarely labelled.
More in Electronics, Racks & Enclosures
The same screw also fits
Devices whose records share a thread with Keystone metric hex PCB standoff (M4), closest length match first.
- Instrument enclosure bezel screws (Metcase Technomet-Control) also M4
- ETC Sensor+ Dimmer Rack (theatrical stage lighting dimmer rack, rigging control gear) also M4
- Elo EMV bracket flat-head screw (Bag R) also M4
- ETC Unison ERn Wall-mount Enclosure (theatre control processing rack) also M4
- Eurorack synthesiser case (Intellijel 7U Performance Case Gen 2) also M4
- Hammond 1555F enclosure also M4
- Stinger SE-SDIN adapter bracket also M4
- Festo DASP-M4-125-A sensor bracket also M4
Questions about Keystone metric hex PCB standoff (M4) screws
- What size screw does Keystone metric hex PCB standoff (M4) use?
- M4 for same catalog lists 6.0 hex M4 thread standoffs with 9.5mm thread engagement.
- How long are the screws in Keystone metric hex PCB standoff (M4)?
- 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 Keystone metric hex PCB standoff (M4)?
- 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.