Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head) screw size
M2.5 · 5 mm long
Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head) takes M2.5 metric screws, 5 mm long.
It is listed for A2 stainless pivot screw, Torx T8, for floating-washer pivots.
Head and drive, as the source states them: Torx T8 drive.
This entry is marked confirmed and comes from slash2gash.com.
An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan 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 |
|---|---|---|---|---|---|---|
| M2.5 | 5 mm | 0.45 mm | not stated | Torx T8 | A2 stainless pivot screw, Torx T8, for floating-washer pivotsstainless, washer / flange face | Confirmed |
Fitment records and sources
A2 stainless pivot screw, Torx T8, for floating-washer pivots
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- If several screws hold the same part, check that they are all the same length before assuming they are.
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 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 5 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source names a Torx T8 drive. For comparison, standard M2.5 heads take PH1 (Phillips) or T8 (Torx), or a 2 mm hex key.
- Tightening: no device-specific torque is published in these records. The site's general figure for M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
- M2.5 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.
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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Devices whose records share a thread with Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head), closest length match first.
- DIN 965 / ISO 7046 countersunk Phillips screw also M2.5 × 5 mm
- DIN 912 socket-head cap screw also M2.5 × 5 mm
- Lenovo ThinkPad Edge E125 also M2.5 × 5 mm
- Lenovo ideapad 320-14ISK also M2.5 × 5 mm
- Dell Precision 3560 also M2.5 × 5 mm
- Dell Latitude E6400 ATG also M2.5 × 5 mm
- Acer Aspire 5230 also M2.5 × 5 mm
- Dell Inspiron 2650 also M2.5 × 5 mm
Questions about Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head) screws
- What size screw does Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head) use?
- M2.5 × 5 mm for A2 stainless pivot screw, Torx T8, for floating-washer pivots.
- How long are the screws in Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head)?
- The record gives 5 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head)?
- The source lists a Torx T8 drive. Standard M2.5 heads otherwise take PH1 (Phillips) or T8 (Torx), or a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Balisong / butterfly knife pivot (aftermarket, ISO 14583 pan head)?
- TechSpareWarehouse (our own store) lists M2.5 x 5mm, which matches the length in the records above.