What size screw does UCTRONICS U6264 1U Raspberry Pi rack mount use?

M2.5 × 5 mm for round head screws securing each Pi board; M3 × 5 mm for flat head screws securing 2.5in SSD.

How long are the screws in UCTRONICS U6264 1U Raspberry Pi rack mount?

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 UCTRONICS U6264 1U Raspberry Pi rack mount?

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 UCTRONICS U6264 1U Raspberry Pi rack mount?

TechSpareWarehouse (our own store) lists M2.5 x 5mm and M3 x 5mm, which match lengths in the records above.

UCTRONICS U6264 1U Raspberry Pi rack mount screw size

M2.5 / M3 · 5 mm long

Our records put UCTRONICS U6264 1U Raspberry Pi rack mount on M2.5 and M3 screws, 5 mm long.

There are 2 separate fitment records for it, including round head screws securing each Pi board (M2.5) and flat head screws securing 2.5in SSD (M3).

Head and drive, as the sources state them: flat / countersunk head.

2 of the 2 records are marked confirmed, drawn from 1 source (manualspro.net).

M2.5 means a 2.5 mm nominal diameter with a 0.45 mm thread pitch. 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.

UCTRONICS U6264 1U Raspberry Pi rack mount 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	round head screws securing each Pi board	Confirmed
M3	5 mm	0.5 mm	Flat / countersunk	not stated	flat head screws securing 2.5in SSD	Confirmed

Fitment records and sources

M2.55mmconfirmed

round head screws securing each Pi board

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

Source

M35mmconfirmed

flat head screws securing 2.5in SSD

pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10

Source

How to check the screw before you buy

Rack and enclosure hardware mixes metric and imperial (#8-32, #10-32, #6-32), so confirm the thread before forcing a screw.
Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). This device also uses M3, so measure each screw rather than assuming they match.
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: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
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 / M3

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.
3.5in desktop and enterprise hard drives are 6-32 UNC imperial, not M3 - only the 2.5in form factor is metric.
Raspberry Pi holes are M2.5, not M3 — forcing M3 means reaming the hole and risking a cracked board.

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 UCTRONICS U6264 1U Raspberry Pi rack mount, closest length match first.

Network switch & patch panel internals also M3 × 5 mm
GPU rear bracket anchor also M3 × 5 mm
ASUS ZenBook / VivoBook / TUF also M2.5 × 5 mm
2.5in SATA / SAS hard drives and SSDs (SFF-8201) also M3 × 5 mm
cab Applicator A3200 print-and-apply labeling system (packaging line hardware) also M3 × 5 mm
MikroTik cAP lite flush-box bracket also M3 × 5 mm
ATEN 2K-0009 secure KVM rack mount kit also M3 × 5 mm
External 3.5in HDD enclosures also M3 × 5 mm

Questions about UCTRONICS U6264 1U Raspberry Pi rack mount screws

What size screw does UCTRONICS U6264 1U Raspberry Pi rack mount use?: M2.5 × 5 mm for round head screws securing each Pi board; M3 × 5 mm for flat head screws securing 2.5in SSD.
How long are the screws in UCTRONICS U6264 1U Raspberry Pi rack mount?: 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 UCTRONICS U6264 1U Raspberry Pi rack mount?: 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 UCTRONICS U6264 1U Raspberry Pi rack mount?: TechSpareWarehouse (our own store) lists M2.5 x 5mm and M3 x 5mm, which match lengths in the records above.

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