Ryobi RY40001B 40V power head screw size
M4 · 14 to 30 mm long
Our records put Ryobi RY40001B 40V power head on M4 screws in lengths from 14 to 30 mm.
There are 2 separate fitment records for it, including rear handle assembly and housing screws (9), T15 Torx pan head (M4) and long housing / handle screw, T15 Torx pan head (M4).
Head and drive, as the sources state them: pan head and Torx T15 drive.
2 of the 2 records are marked confirmed, drawn from 1 source (Ryobi RY40001B Repair Sheet).
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Ryobi RY40001B 40V power 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 | 14 mm | 0.7 mm | Pan head | Torx T15 | rear handle assembly and housing screws (9), T15 Torx pan head | Confirmed |
| M4 | 30 mm | 0.7 mm | Pan head | Torx T15 | long housing / handle screw, T15 Torx pan head | Confirmed |
Fitment records and sources
rear handle assembly and housing screws (9), T15 Torx pan head
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
long housing / handle screw, T15 Torx pan head
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Check the strength class stamped on the head (8.8, 10.9, A2-70) and replace like for like.
- 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: for pan head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 14–30 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Torx T15 drive. For comparison, standard M4 heads take PH2 (Phillips) or T20 (Torx), or a 3 mm hex key.
- 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
- US-made pinball machines (Williams/Bally/Stern) overwhelmingly use imperial UTS threads (#6-32, #8-32, #10-32); explicit metric threads only appear on newer/import components such as Jersey Jack Pinball's Hobbit Smaug assembly (M3).
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
More in Industrial & Machinery
The same screw also fits
Devices whose records share a thread with Ryobi RY40001B 40V power head, closest length match first.
- Pinball cabinet hardware (EU restorations) also M4 × 14 mm
- Rhea Vendors Luce Publico vending machine also M4 × 14 mm
- Power tool battery pack shell also M4 × 14 mm
- Milwaukee M18 FUEL 16in chainsaw (54-40-1640) also M4 × 14 mm
- Makita 6095D cordless driver drill also M4 × 30 mm
- Homelite garden tool (part 661817001) also M4 × 14 mm
- Circular saw blade guard pivot also M4 × 14 mm
- SICK sensor mounting accessories also M4 × 14 mm
Questions about Ryobi RY40001B 40V power head screws
- What size screw does Ryobi RY40001B 40V power head use?
- M4 × 14 mm for rear handle assembly and housing screws (9), T15 Torx pan head; M4 × 30 mm for long housing / handle screw, T15 Torx pan head.
- How long are the screws in Ryobi RY40001B 40V power head?
- The records range from 14 to 30 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 Ryobi RY40001B 40V power head?
- The source lists a Torx T15 drive. Standard M4 heads otherwise take PH2 (Phillips) or T20 (Torx), or 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.