Victron MultiPlus-II / Quattro-II inverter-charger screw size
M4 · length not stated in the sources
The screws used on Victron MultiPlus-II / Quattro-II inverter-charger are M4. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: M4 AC and control terminal bolts, torque 1 Nm.
This entry is marked confirmed and comes from victronenergy.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.
Victron MultiPlus-II / Quattro-II inverter-charger screw specifications
One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Torque | Where it goes | Status |
|---|---|---|---|---|---|---|---|
| M4 | not stated | 0.7 mm | not stated | not stated | 1 Nm | M4 AC and control terminal bolts, torque 1 Nm | Confirmed |
Fitment records and sources
M4 AC and control terminal bolts, torque 1 Nm
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- 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.
Common mix-ups with M4
- Manual gives torque only, not screw length/drive type — verify physically before sourcing replacements.
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
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Questions about Victron MultiPlus-II / Quattro-II inverter-charger screws
- What size screw does Victron MultiPlus-II / Quattro-II inverter-charger use?
- M4 for M4 AC and control terminal bolts, torque 1 Nm.
- How long are the screws in Victron MultiPlus-II / Quattro-II inverter-charger?
- 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 Victron MultiPlus-II / Quattro-II inverter-charger?
- 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.
- How tight should the M4 screw on Victron MultiPlus-II / Quattro-II inverter-charger be?
- The source gives 1 Nm for M4 AC and control terminal bolts, torque 1 Nm.