Pinball machine (Jersey Jack Pinball 'Hobbit') screw size
M3 · 4.76 mm long
If you are replacing a screw on Pinball machine (Jersey Jack Pinball 'Hobbit'), the thread is M3, 4.76 mm long.
Where it is used: M3 x 3/16" flat head machine screw with undercut, used in the Smaug assembly (JJP part #80-0061M3-03).
Head and drive, as the source states them: flat / countersunk head.
This entry is marked confirmed and comes from pinballlife.com.
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Pinball machine (Jersey Jack Pinball 'Hobbit') 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 |
|---|---|---|---|---|---|---|
| M3 | 4.76 mm | 0.5 mm | Flat / countersunk | not stated | M3 x 3/16" flat head machine screw with undercut, used in the Smaug assembly (JJP part #80-0061M3-03) | Confirmed |
Fitment records and sources
M3 x 3/16" flat head machine screw with undercut, used in the Smaug assembly (JJP part #80-0061M3-03)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The record states 4.76 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 M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- Power-tool gearcase and clamshell screws are usually thread-forming (marked "ST") even when the parts list gives an M-size — a normal machine screw of the same size may not hold in the plastic boss.
- GE patient monitors often use 'PT 3x10mm' screws; these are thread-forming screws for plastic and are NOT standard M3 machine threads.
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.
More in Industrial & Machinery
The same screw also fits
Devices whose records share a thread with Pinball machine (Jersey Jack Pinball 'Hobbit'), closest length match first.
- Motherboard to case standoffs also M3 × 4.76 mm
- Fishing reel handle retainer also M3 × 4.76 mm
- GT2 timing pulley grub screws also M3 × 4.76 mm
- Video doorbell lens bezel also M3 × 4.76 mm
- ALware Quad Flyer Spider 500 quadcopter kit also M3 × 4.76 mm
- Camera cage shells (SmallRig-style) also M3 × 4.76 mm
- Bambu Lab X1/P1/AMS spare screw kit also M3 × 4.76 mm
- Network switch & patch panel internals also M3 × 4.76 mm
Questions about Pinball machine (Jersey Jack Pinball 'Hobbit') screws
- What size screw does Pinball machine (Jersey Jack Pinball 'Hobbit') use?
- M3 × 4.76 mm for M3 x 3/16" flat head machine screw with undercut, used in the Smaug assembly (JJP part #80-0061M3-03).
- How long are the screws in Pinball machine (Jersey Jack Pinball 'Hobbit')?
- The record gives 4.76 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Pinball machine (Jersey Jack Pinball 'Hobbit')?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Pinball machine (Jersey Jack Pinball 'Hobbit')?
- TechSpareWarehouse (our own store) lists M3 x 5mm, which matches the length in the records above.