Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter screw size
M3 / M4 · length not stated in the sources
Our records put Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter on M3 and M4 screws. None of the sources we found gives an exact length, so measure the original before you order.
There are 2 separate fitment records for it, including flush mount: an included M3 screw secures the nut plate through the smaller 3.6 mm hole (M3) and device secures to the mounting surface with the included M4 machine screws; in fibreglass (M4).
2 of the 2 records are marked confirmed, drawn from 1 source (www8.garmin.com).
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter 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 | not stated | 0.5 mm | not stated | not stated | Flush mount: an included M3 screw secures the nut plate through the smaller 3.6 mm hole | Confirmed |
| M4 | not stated | 0.7 mm | not stated | not stated | Device secures to the mounting surface with the included M4 machine screws; in fibreglass or composite dash you drill and tap M4 holes | Confirmed |
Fitment records and sources
Flush mount: an included M3 screw secures the nut plate through the smaller 3.6 mm hole
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Device secures to the mounting surface with the included M4 machine screws; in fibreglass or composite dash you drill and tap M4 holes
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Where the manufacturer publishes a torque value, use a torque driver rather than feel.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). This device also uses M4, so measure each screw rather than assuming they match.
- 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: 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 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 / M4
- Some sewing-machine screws are labeled with metric-looking but slightly nonstandard sizes (e.g. M3.3) that are not true ISO M3 and are not interchangeable with standard M3 hardware.
- Drill chuck retaining screws are commonly LEFT-HAND thread (e.g. M6 x 1.0 LH) — turn clockwise to remove.
- 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.
More in Vehicles, Marine & Mobility
The same screw also fits
Devices whose records share a thread with Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter, closest length match first.
- Dometic Refrigerator also M4
- Chainsaw air filter cover also M4
- Dinkle DK4 DIN rail terminal block also M3
- Bosch Performance Line CX Gen 4 Motor also M4
- Arduino UNO / full-size Arduino boards also M3
- Scope / rail mount base screws (metric) also M4
- Motorcycle fairing panels also M4
- Wago 869-107 terminal strip also M3
Questions about Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter screws
- What size screw does Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter use?
- M3 for flush mount: an included M3 screw secures the nut plate through the smaller 3.6 mm hole; M4 for device secures to the mounting surface with the included M4 machine screws; in fibreglass or composite dash you drill and tap M4 holes.
- How long are the screws in Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter?
- 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 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 Garmin GPSMAP 8x10 / 8x12 / 8x16 chartplotter?
- 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.