Juki sewing machines screw size
M4 · length not stated in the sources
Juki sewing machines takes M4 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
The record covers genuine needle plate screw listed as M4.
This entry is marked likely and comes from konsew.co.uk.
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.
Juki 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 | not stated | 0.7 mm | not stated | not stated | Genuine needle plate screw listed as M4 | Likely |
Fitment records and sources
Genuine needle plate screw listed as M4
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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.
- 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 Juki sewing machines, closest length match first.
- Contender Planetary Mixer MXP004/MXP005 (commercial bakery mixer) electrical diagram terminal screws also M4
- Makita 6095D cordless driver drill also M4
- Makita GB801 also M4
- JCM WBA-series World Bill Acceptor (used in slot/gaming machine cabinets) also M4
- Juki home/industrial sewing machine needle plate also M4
- Eurodib LB Series Spiral Mixer (bakery dough mixer) electrical control box also M4
- Juki MF-7900 industrial coverstitch machine also M4
- Siemens SIMATIC ET 200AL distributed I/O functional earth also M4
Questions about Juki sewing machines screws
- What size screw does Juki sewing machines use?
- M4 for genuine needle plate screw listed as M4.
- How long are the screws in Juki sewing machines?
- 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 Juki 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.