What size screw does Dell XPS 15 L521X use?

M1.6 × 3 mm for 21 keyboard bracket screws securing bracket to palmrest.

How long are the screws in Dell XPS 15 L521X?

The record gives 3 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.

What is the thread pitch of an M1.6 screw?

0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.

What screwdriver do I need for Dell XPS 15 L521X?

The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.

Can I use an imperial screw instead of M1.6?

No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Dell XPS 15 L521X?

TechSpareWarehouse (our own store) lists M1.6 x 3mm, which matches the length in the records above.

Dell XPS 15 L521X screw size

M1.6 · 3 mm long

The screws used on Dell XPS 15 L521X are M1.6, 3 mm long.

The record covers 21 keyboard bracket screws securing bracket to palmrest.

This entry is marked confirmed and comes from manualsdump.com.

For reference, M1.6 is 1.6 mm across the threads at 0.35 mm pitch. The imperial size people confuse it with: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent.

Dell XPS 15 L521X 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
M1.6	3 mm	0.35 mm	not stated	not stated	21 keyboard bracket screws securing bracket to palmrest	Confirmed

Fitment records and sources

M1.6~3mmconfirmed

21 keyboard bracket screws securing bracket to palmrest

pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5

Source

How to check the screw before you buy

Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
Diameter: across the threads an M1.6 screw measures about 1.6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.35 mm from one thread crest to the next (28.57 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 3 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 M1.6 heads take PH00 for Phillips and T4–T5 for Torx, and a 1.5 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 M1.6 is about 12-20 N·cm into metal threads and 6-10 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M1.6

M1.6 is the most common laptop-internal micro screw after M2 — Dell XPS keyboards specifically call out M1.6 x 1.5mm, and generic M2 substitutes strip the bracket.

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 Dell XPS 15 L521X, closest length match first.

Arduino / PCB standoffs also M1.6 × 3 mm
HP mt46 Mobile Thin Client (id 37874521; MSG on PAGE 2) also M1.6 × 3 mm
Steam Deck (LCD) Type 5 fastener also M1.6 × 3 mm
HP Victus by HP 16.1 inch Gaming 16-d0000 also M1.6 × 3 mm
MacBook Pro 15-inch Retina (Mid 2015) lower case also M1.6 × 3 mm
Framework Laptop 12 bezel and hinge fasteners also M1.6 × 3 mm
Dell XPS 14 9440 also M1.6 × 3 mm
Dell Latitude 5285 also M1.6 × 3 mm

Questions about Dell XPS 15 L521X screws

What size screw does Dell XPS 15 L521X use?: M1.6 × 3 mm for 21 keyboard bracket screws securing bracket to palmrest.
How long are the screws in Dell XPS 15 L521X?: The record gives 3 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
What is the thread pitch of an M1.6 screw?: 0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.
What screwdriver do I need for Dell XPS 15 L521X?: The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.
Can I use an imperial screw instead of M1.6?: No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Dell XPS 15 L521X?: TechSpareWarehouse (our own store) lists M1.6 x 3mm, which matches the length in the records above.

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