Pioneer Head Units screw size
M5 · 8 mm long
The screws used on Pioneer Head Units are M5, 8 mm long.
The record covers ISO mounting screws used to secure the unit to a vehicle dash bracket.
This entry is marked confirmed and comes from shuntool.com.
For reference, M5 is 5 mm across the threads at 0.8 mm pitch. The imperial size people confuse it with: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Pioneer Head Units 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 |
|---|---|---|---|---|---|---|
| M5 | 8 mm | 0.8 mm | not stated | not stated | ISO mounting screws used to secure the unit to a vehicle dash bracket | Confirmed |
Fitment records and sources
ISO mounting screws used to secure the unit to a vehicle dash bracket.
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
- Diameter: across the threads an M5 screw measures about 5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.8 mm from one thread crest to the next (12.5 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 record states 8 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 M5 heads take PH2 for Phillips and T25 for Torx, and a 4 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 M5 is about 4.0-6.0 N·m into metal threads and 1.5-2.5 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M5
- ISO mounting screws for head units must not exceed 8mm in length to avoid internal component damage.
- M5x0.8 is the de facto universal bike thread — confirm 0.8mm pitch before threading into carbon or alloy bosses.
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Devices whose records share a thread with Pioneer Head Units, closest length match first.
- Marine-grade set/grub screw (DIN 916, A4 stainless) also M5 × 8 mm
- Weidmueller BFSC busbar/DIN-rail screw accessory also M5 × 8 mm
- Electrolux Professional compact rack-type dishwasher also M5 × 8 mm
- NEMA 23 stepper motor face also M5 × 8 mm
- Bicycle SPD-SL / SPD cleat fixing bolts also M5 × 8 mm
- Husqvarna chainsaw/brushcutter hardware also M5 × 8 mm
- Faucet handle set screws also M5 × 8 mm
- DIN 912 socket-head cap screw also M5 × 8 mm
Questions about Pioneer Head Units screws
- What size screw does Pioneer Head Units use?
- M5 × 8 mm for ISO mounting screws used to secure the unit to a vehicle dash bracket.
- How long are the screws in Pioneer Head Units?
- The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M5 screw?
- 0.8 mm (coarse), which is the standard pitch for M5 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 4.2 mm and the normal clearance hole is 5.5 mm.
- What screwdriver do I need for Pioneer Head Units?
- The sources do not name the drive. For M5, Phillips heads normally take PH2 and Torx heads T25; socket heads take a 4 mm hex key.
- Can I use an imperial screw instead of M5?
- No. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing. Use a true M5 screw so it does not cross-thread or strip the hole.