Espresso machine group head screw size
M4 · 10 to 20 mm long
The screws used on Espresso machine group head are M4 in lengths from 10 to 20 mm.
It is listed for secures the group head to the boiler or brew unit.
This entry is marked reported and comes from homebarista.com.
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.
Espresso machine group head 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 | 10–20 mm | 0.7 mm | not stated | not stated | secures the group head to the boiler or brew unit | Reported |
Fitment records and sources
secures the group head to the boiler or brew unit
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Appliance panels often use self-tapping screws into sheet metal or plastic, and machine screws into nuts or inserts — keep each type where it came from.
- 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 records span 10–20 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
- Most HVAC chassis hardware in US-market units is imperial; metric shows up mainly on European-made components.
- Water heater elements use pipe threads (NPSM/NPT), not metric machine screws.
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.
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Devices whose records share a thread with Espresso machine group head, closest length match first.
- Furrion RV appliance trim kit hardware also M4 × 10 mm
- Dyson vacuum motor housing also M4 × 10–20 mm
- Bosch dishwasher also M4 × 17 mm
- Thermostat and wall control backplates also M4 × 20 mm
- Drip coffee machine housing also M4 × 10–16 mm
- Daikin FTXS/CTXS Mini-split indoor unit mounting / terminal cover screw also M4 × 12 mm
- Samsung dishwasher also M4 × 12 mm
- Dishwasher control console also M4 × 10–12 mm
Questions about Espresso machine group head screws
- What size screw does Espresso machine group head use?
- M4 × 10–20 mm for secures the group head to the boiler or brew unit.
- How long are the screws in Espresso machine group head?
- The records range from 10 to 20 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 Espresso machine group head?
- 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.