How long are the screws in Acer Aspire One 521 laptop LCD hinge?

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 Acer Aspire One 521 laptop LCD hinge?

The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take 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 Acer Aspire One 521 laptop LCD hinge?

TechSpareWarehouse (our own store) lists M2.5 x 5mm, which matches the length in the records above.

Acer Aspire One 521 laptop LCD hinge screw size

M2.5 · 5 mm long

The screws used on Acer Aspire One 521 laptop LCD hinge are M2.5, 5 mm long.

The record covers service manual disassembly step: 'Remove two (2) screws from the hinge', Screw Type M2.5*5.

This entry is marked confirmed and comes from manualsdump.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.

Acer Aspire One 521 laptop LCD hinge 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	not stated	Service manual disassembly step: 'Remove two (2) screws from the hinge', Screw Type M2.5*5	Confirmed

Fitment records and sources

M2.5M2.5x5confirmed

Service manual disassembly step: 'Remove two (2) screws from the hinge', Screw Type M2.5*5

pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8

Source

How to check the screw before you buy

Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
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 does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 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 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

Projector optics and fan screws often step down to M2.5 while the outer covers use M3 - do not reuse cover screws inside the light engine.
M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.

Pitch gauge · Screw size finder · Torque guide

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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The same screw also fits

Devices whose records share a thread with Acer Aspire One 521 laptop LCD hinge, closest length match first.

Lenovo K4450 also M2.5 × 5 mm
Dell Inspiron 6000 also M2.5 × 5 mm
Lenovo M50-80 also M2.5 × 5 mm
Dell Inspiron 500m also M2.5 × 5 mm
Lenovo ideapad 330-15ARR also M2.5 × 5 mm
Lenovo ThinkPad P72 also M2.5 × 5 mm
HP ProBook 455 G3 also M2.5 × 5 mm
Lenovo ideapad 330-17IKB D also M2.5 × 5 mm

Questions about Acer Aspire One 521 laptop LCD hinge screws

What size screw does Acer Aspire One 521 laptop LCD hinge use?: M2.5 × 5 mm for service manual disassembly step: 'Remove two (2) screws from the hinge', Screw Type M2.5*5.
How long are the screws in Acer Aspire One 521 laptop LCD hinge?: 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 Acer Aspire One 521 laptop LCD hinge?: The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take 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 Acer Aspire One 521 laptop LCD hinge?: TechSpareWarehouse (our own store) lists M2.5 x 5mm, which matches the length in the records above.

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