Singer 4423 / Necchi / Bernette / EverSewn sewing machines screw size
M4 · 6 mm long
Singer 4423 / Necchi / Bernette / EverSewn sewing machines takes M4 metric screws, 6 mm long.
It is listed for needle plate screw.
This entry is marked confirmed and comes from millardsewing.com.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Singer 4423 / Necchi / Bernette / EverSewn sewing machines 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 | 6 mm | 0.7 mm | not stated | not stated | needle plate screw | Confirmed |
Fitment records and sources
How to check the screw before you buy
- Check the strength class stamped on the head (8.8, 10.9, A2-70) and replace like for like.
- 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 6 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
- US-made pinball machines (Williams/Bally/Stern) overwhelmingly use imperial UTS threads (#6-32, #8-32, #10-32); explicit metric threads only appear on newer/import components such as Jersey Jack Pinball's Hobbit Smaug assembly (M3).
- Pinball machines are historically imperial (UNC/UNF). Metric M4 shows up mainly in specific parts like cooling fans or in European rebuilds.
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Devices whose records share a thread with Singer 4423 / Necchi / Bernette / EverSewn sewing machines, closest length match first.
- Singer Viking Emerald 203 sewing machine also M4 × 6 mm
- Makita GB801 also M4 × 6 mm
- Singer 3323/3321 sewing machine also M4 × 6 mm
- Needle plate screw for Bernette/EverSewn/Necchi/Singer industrial-style sewing machines also M4 × 6 mm
- Keystone Electronics Snap-in PCB screw terminal (control gear and LED driver terminals) also M4 × 6 mm
- Telescope finder-scope shoe / base (TS-Optics) also M4 × 6 mm
- DIN 965 / ISO 7046 countersunk Phillips screw also M4 × 6 mm
- Elo EMV bracket flat-head screw (Bag R) also M4 × 6 mm
Questions about Singer 4423 / Necchi / Bernette / EverSewn sewing machines screws
- What size screw does Singer 4423 / Necchi / Bernette / EverSewn sewing machines use?
- M4 × 6 mm for needle plate screw.
- How long are the screws in Singer 4423 / Necchi / Bernette / EverSewn sewing machines?
- The record gives 6 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 Singer 4423 / Necchi / Bernette / EverSewn sewing machines?
- 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.