Singer Viking Emerald 203 sewing machine screw size
M4 · 6 to 8 mm long
Our records put Singer Viking Emerald 203 sewing machine on M4 screws in lengths from 6 to 8 mm.
There are 2 separate fitment records for it, including set screw on thread take-up lever supporter shaft (M4) and set screw on arm shaft balance pin (M4).
Head and drive, as the sources state them: set screw (headless) head.
2 of the 2 records are marked confirmed, drawn from 1 source (site.singeronline.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 Viking Emerald 203 sewing machine 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 | 8 mm | 0.7 mm | Set screw (headless) | not stated | set screw on thread take-up lever supporter shaft | Confirmed |
| M4 | 6 mm | 0.7 mm | Set screw (headless) | not stated | set screw on arm shaft balance pin | Confirmed |
Fitment records and sources
set screw on thread take-up lever supporter shaft
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
set screw on arm shaft balance pin
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: for set screw (headless) screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 6–8 mm, which means different positions take different lengths — match each hole to its own screw.
- 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
- 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.
- Smart doorbell and lock kits bundle metric machine screws with imperial wood screws in the same bag; the metric ones are rarely labelled.
More in Industrial & Machinery
The same screw also fits
Devices whose records share a thread with Singer Viking Emerald 203 sewing machine, closest length match first.
- Makita GB801 also M4 × 8 mm
- Pinball machine fan screw also M4 × 8 mm
- Tuttnauer manual autoclaves also M4 × 8 mm
- Juki MF-7923 / MF-7523 industrial machine also M4 × 8 mm
- Pinball cabinet hardware (EU restorations) also M4 × 8 mm
- Singer 4423 / Necchi / Bernette / EverSewn sewing machines also M4 × 6 mm
- Rhea Vendors Luce Publico vending machine also M4 × 8 mm
- Needle plate screw for Bernette/EverSewn/Necchi/Singer industrial-style sewing machines also M4 × 6 mm
Questions about Singer Viking Emerald 203 sewing machine screws
- What size screw does Singer Viking Emerald 203 sewing machine use?
- M4 × 8 mm for set screw on thread take-up lever supporter shaft; M4 × 6 mm for set screw on arm shaft balance pin.
- How long are the screws in Singer Viking Emerald 203 sewing machine?
- The records range from 6 to 8 mm depending on the position, so match each screw to its own hole.
- 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 Viking Emerald 203 sewing machine?
- 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.