PXI instrument chassis rack flange screw size
M4 · 8 mm long
PXI instrument chassis rack flange takes M4 metric screws, 8 mm long.
It is listed for sixteen M4 x 8mm flat-head Phillips screws attach rack flanges to a PXI instrumentation chassis.
Head and drive, as the source states them: flat / countersunk head and Phillips drive.
This entry is marked confirmed and comes from vpc.com.
M4 means a 4 mm nominal diameter with a 0.7 mm thread pitch. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
PXI instrument chassis rack flange 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 | 8 mm | 0.7 mm | Flat / countersunk | Phillips | Sixteen M4 x 8mm flat-head Phillips screws attach rack flanges to a PXI instrumentation chassiswasher / flange face | Confirmed |
Fitment records and sources
Sixteen M4 x 8mm flat-head Phillips screws attach rack flanges to a PXI instrumentation chassis
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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 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: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The record states 8 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source names a Phillips drive. For comparison, standard M4 heads take PH2 (Phillips) or T20 (Torx), or a 3 mm hex key.
- 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
- Some rackmount KVM switch kits pair M4x10 bracket-to-rack screws with M3.2x4.5 bracket-to-chassis screws (non-standard M3.2, not a true M3), so kits are not fully interchangeable with generic M3/M4 hardware.
- Most HVAC chassis hardware in US-market units is imperial; metric shows up mainly on European-made components.
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Devices whose records share a thread with PXI instrument chassis rack flange, closest length match first.
- 19-inch rack cage nut (light equipment) also M4 × 8 mm
- Wurth Elektronik WA-SSTIE steel spacer stud also M4 × 8 mm
- Eurorack synthesiser case (Intellijel 7U Performance Case Gen 2) also M4 × 8 mm
- Electronics enclosures also M4 × 8 mm
- Soundbar wall brackets also M4 × 8 mm
- Panasonic AW-RC400 pan/tilt control panel rack-mounting adaptors also M4 × 8 mm
- Marine electronics housings also M4 × 8 mm
- Midea/Little Swan front-load washer control board technical service guide also M4 × 8 mm
Questions about PXI instrument chassis rack flange screws
- What size screw does PXI instrument chassis rack flange use?
- M4 × 8 mm for sixteen M4 x 8mm flat-head Phillips screws attach rack flanges to a PXI instrumentation chassis.
- How long are the screws in PXI instrument chassis rack flange?
- The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 PXI instrument chassis rack flange?
- The source lists a Phillips drive. Standard M4 heads otherwise take PH2 (Phillips) or T20 (Torx), or 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.