License plate / number plate mounting (Dorman 784-518 universal fastener) screw size
M6 · 20 mm long
The screws used on License plate / number plate mounting (Dorman 784-518 universal fastener) are M6, 20 mm long.
The record covers plate-to-bracket fastener, M6-1.0 coarse.
This entry is marked confirmed and comes from dormanproducts.com.
M6 means a 6 mm nominal diameter with a 1 mm thread pitch. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.
License plate / number plate mounting (Dorman 784-518 universal fastener) 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 |
|---|---|---|---|---|---|---|
| M6 | 20 mm | 1 mm | not stated | not stated | plate-to-bracket fastener, M6-1.0 coarse | Confirmed |
Fitment records and sources
plate-to-bracket fastener, M6-1.0 coarse
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
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 M6 screw measures about 6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 1 mm from one thread crest to the next (10 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 20 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 M6 heads take PH3 for Phillips and T30 for Torx, and a 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 M6 is about 7-10 N·m into metal threads and 2.5-4.0 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M6
- Optical breadboards are metric only when the part number ends in /M; the default in North America is 1/4-20.
- 19-inch racks are not all metric: 10-32 and 12-24 UNC are still the norm in North America, with M6 the metric/square-hole cage-nut option.
More in Electronics, Racks & Enclosures
19-inch rack cage nut (light equipment)19-inch rack cage nut (metric square-hole rails)19-inch rack cage nut (mid size)19-inch rack cage nut and panel screw19-inch rack network and AV gear19-inch rack-mount audio/AV equipment19-inch server racks19in / 10in server rack cage nut and screw kit19in equipment rack (Kendall Howard cage nuts)19in rack cage nuts (alternate metric)19in rack cage nuts (metric)1U rack-mount PDU (American Denki)
Browse all 357 in Electronics, Racks & Enclosures →The same screw also fits
Devices whose records share a thread with License plate / number plate mounting (Dorman 784-518 universal fastener), closest length match first.
- WABCO/ZF OnSide blind spot radar sensor bracket also M6 × 20 mm
- Kayak T-slot track rail mounting screw also M6 × 20 mm
- Wurth Elektronik WA-SSTIE steel spacer stud also M6 × 20 mm
- Xiaomi M365 / Ninebot brake caliper also M6 × 20 mm
- RF Elements Twin Horn antenna bracket also M6 × 20 mm
- FJD 3D Excavator Guidance System (GNSS/IMU hardware) also M6 × 20 mm
- Power wheelchair drive motor mounts also M6 × 20 mm
- Electrolux Professional compact rack-type dishwasher also M6 × 20 mm
Questions about License plate / number plate mounting (Dorman 784-518 universal fastener) screws
- What size screw does License plate / number plate mounting (Dorman 784-518 universal fastener) use?
- M6 × 20 mm for plate-to-bracket fastener, M6-1.0 coarse.
- How long are the screws in License plate / number plate mounting (Dorman 784-518 universal fastener)?
- The record gives 20 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M6 screw?
- 1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.
- What screwdriver do I need for License plate / number plate mounting (Dorman 784-518 universal fastener)?
- The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.
- Can I use an imperial screw instead of M6?
- No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.