Circular saw blade guard pivot screw size
M4 · 12 to 18 mm long
If you are replacing a screw on Circular saw blade guard pivot, the thread is M4 in lengths from 12 to 18 mm.
Where it is used: the retractable lower guard.
This entry is marked reported and comes from ifixit.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.
Circular saw blade guard pivot 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 | 12–18 mm | 0.7 mm | not stated | not stated | the retractable lower guard | Reported |
Fitment records and sources
the retractable lower guard
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Industrial parts lists usually give the full callout (thread, length, head, grade); match all four, not just the thread.
- 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.
- The records span 12–18 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
- Oster and Wahl clipper blade screws are often imperial #6-32, not metric - measure before assuming.
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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M4 x 12mm Black Wafer Head Chainsaw & Cut-off Saw Screws for STIHL MS 460, MS 362, TS480i & TS500i (IS-M4x12) – 10-Pack Replacement
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M4 x 12mm Black Wafer Head Monitor VESA, Neck & Stand Screws for Dell UltraSharp U4320Q & Sceptre Monitors – 8-Pack Replacement
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Devices whose records share a thread with Circular saw blade guard pivot, closest length match first.
- SICK sensor mounting accessories also M4 × 14 mm
- DeWalt D51430 / D51431 pneumatic nailer also M4 × 16 mm
- Bianchi / Nuova Simonelli / Rheavendors / Saeco vending machine also M4 × 16 mm
- Homelite garden tool (part 661817001) also M4 × 14 mm
- Ryobi / Homelite trimmer housing (part 661189003) also M4 × 18 mm
- Milwaukee M18 FUEL 16in chainsaw (54-40-1640) also M4 × 14 mm
- Power tool battery pack shell also M4 × 12–18 mm
- Juki MF-7900 industrial coverstitch machine also M4 × 12 mm
Questions about Circular saw blade guard pivot screws
- What size screw does Circular saw blade guard pivot use?
- M4 × 12–18 mm for the retractable lower guard.
- How long are the screws in Circular saw blade guard pivot?
- The records range from 12 to 18 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 Circular saw blade guard pivot?
- 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.