ABB random-wound motor terminal boxes (ACS580 drive systems) screw size
M4 · 20 mm long
If you are replacing a screw on ABB random-wound motor terminal boxes (ACS580 drive systems), the thread is M4, 20 mm long.
The record covers M4x20 grounding/terminal hardware in the terminal box.
This entry is marked confirmed and comes from purvisindustries.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.
ABB random-wound motor terminal boxes (ACS580 drive systems) 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 | 20 mm | 0.7 mm | not stated | not stated | M4x20 grounding/terminal hardware in the terminal box | Confirmed |
Fitment records and sources
M4x20 grounding/terminal hardware in the terminal box
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Industrial parts lists usually give the full callout (thread, length, head, grade); match all four, not just the thread.
- 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.
- The record states 20 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- 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
- Grounding-lug screws on Siemens and Beckhoff gear (M4) are earth hardware, not structural mounting screws — don't reuse them to hold a module.
- Display mounts mix systems: the screen side is metric M4/M6, but the wall side of many mounts uses imperial wood screws such as #14 x 2.5in.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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- Garmin zumo XT Motorcycle mount base plate to handlebar mount (panhead screws) also M4 × 20 mm
- LG 32LM6400 also M4 × 20 mm
- LG 47LW9500 also M4 × 20 mm
- Drum hardware wing bolt / memory lock also M4 × 20 mm
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Questions about ABB random-wound motor terminal boxes (ACS580 drive systems) screws
- What size screw does ABB random-wound motor terminal boxes (ACS580 drive systems) use?
- M4 × 20 mm for M4x20 grounding/terminal hardware in the terminal box.
- How long are the screws in ABB random-wound motor terminal boxes (ACS580 drive systems)?
- The record gives 20 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 ABB random-wound motor terminal boxes (ACS580 drive systems)?
- 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.