Nerf blaster thumbscrews (large) screw size
M4 · 8 to 25 mm long
If you are replacing a screw on Nerf blaster thumbscrews (large), the thread is M4 in lengths from 8 to 25 mm.
Where it is used: M4 x 8mm, 20mm and 25mm tapered thumbscrews.
Head and drive, as the source states them: thumb screw (knurled) head.
This entry is marked confirmed and comes from outofdarts.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.
Nerf blaster thumbscrews (large) 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 | 8–25 mm | 0.7 mm | Thumb screw (knurled) | not stated | M4 x 8mm, 20mm and 25mm tapered thumbscrews | Confirmed |
Fitment records and sources
M4 x 8mm, 20mm and 25mm tapered thumbscrews
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Vibration loosens small screws on drones and RC models, so builders commonly add a drop of medium (blue) threadlocker on metal-to-metal joints — never on plastic.
- 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 thumb screw (knurled) screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 8–25 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
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
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Devices whose records share a thread with Nerf blaster thumbscrews (large), closest length match first.
- Typewriter carriage brackets also M4 × 8–14 mm
- Sewing machine motor mount also M4 × 10–20 mm
- Berkel 330M Slicer base/transmission fastener also M4 × 8 mm
- Mid-size drone frames also M4 × 8–16 mm
- HP LaserJet family common hardware also M4 × 8–14 mm
- goBILDA metric building system also M4 × 8–25 mm
- Padlock and safe internals also M4 × 8–12 mm
- Maytronics Dolphin robotic pool cleaner (Ad-series/other Dolphin models) also M4 × 14 mm
Questions about Nerf blaster thumbscrews (large) screws
- What size screw does Nerf blaster thumbscrews (large) use?
- M4 × 8–25 mm for M4 x 8mm, 20mm and 25mm tapered thumbscrews.
- How long are the screws in Nerf blaster thumbscrews (large)?
- The records range from 8 to 25 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 Nerf blaster thumbscrews (large)?
- 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.