Invacare Action3 NG manual wheelchair frame fastener screw size
M4 · length not stated in the sources
Invacare Action3 NG manual wheelchair frame fastener takes M4 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for service manual torque table: M4 1.5-3 Nm.
This entry is marked confirmed and comes from invacare.co.uk.
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.
Invacare Action3 NG manual wheelchair frame fastener screw specifications
One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Torque | Where it goes | Status |
|---|---|---|---|---|---|---|---|
| M4 | not stated | 0.7 mm | not stated | not stated | 1.5-3 Nm | Service manual torque table: M4 1.5-3 Nm | Confirmed |
Fitment records and sources
Service manual torque table: M4 1.5-3 Nm
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 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: 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 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.
Common mix-ups with M4
- Manual gives torque only, not screw length/drive type — verify physically before sourcing replacements.
- Camera rig/cage accessories (SmallRig, Wooden Camera/Metabones) frequently mix M4 structural screws with 1/4-20 and 3/8-16 imperial mounting points on the same product — verify which specific fastener a manual is referencing before ordering replacements.
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Questions about Invacare Action3 NG manual wheelchair frame fastener screws
- What size screw does Invacare Action3 NG manual wheelchair frame fastener use?
- M4 for service manual torque table: M4 1.5-3 Nm.
- How long are the screws in Invacare Action3 NG manual wheelchair frame fastener?
- 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 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 Invacare Action3 NG manual wheelchair frame fastener?
- 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.
- How tight should the M4 screw on Invacare Action3 NG manual wheelchair frame fastener be?
- The source gives 1.5-3 Nm for service manual torque table: M4 1.5-3 Nm.