Juki home/industrial sewing machine needle plate screw size
M4 · length not stated in the sources
Juki home/industrial sewing machine needle plate takes M4 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for genuine Juki needle plate screw listed explicitly as M4 thread.
This entry is marked confirmed and comes from konsew.co.uk.
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.
Juki home/industrial sewing machine needle plate 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 Juki needle plate screw listed explicitly as M4 thread | Confirmed |
Fitment records and sources
Genuine Juki needle plate screw listed explicitly as M4 thread
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
- Water heater elements use pipe threads (NPSM/NPT), not metric machine screws.
- Bopla SHR-Z boss screws and Hammond 1591XXF screws look metric but are self-tapping/imperial — don't substitute a machine screw into those bosses.
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- Eurodib LB Series Spiral Mixer (bakery dough mixer) electrical control box also M4
- Juki MF-7900 industrial coverstitch machine also M4
- Contender Planetary Mixer MXP004/MXP005 (commercial bakery mixer) electrical diagram terminal screws also M4
- Juki sewing machines also M4
- Makita GB801 also M4
- Makita 6095D cordless driver drill also M4
- JCM WBA-series World Bill Acceptor (used in slot/gaming machine cabinets) also M4
- Milwaukee M18 FUEL 16in chainsaw (54-40-1640) also M4
Questions about Juki home/industrial sewing machine needle plate screws
- What size screw does Juki home/industrial sewing machine needle plate use?
- M4 for genuine Juki needle plate screw listed explicitly as M4 thread.
- How long are the screws in Juki home/industrial sewing machine needle plate?
- 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 home/industrial sewing machine needle plate?
- 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.