How long are the screws in GCX barcode scanner adapter kit (scanner-to-bracket)?

The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.

What is the thread pitch of an M3 screw?

0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.

What screwdriver do I need for GCX barcode scanner adapter kit (scanner-to-bracket)?

The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.

Can I use an imperial screw instead of M3?

No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for GCX barcode scanner adapter kit (scanner-to-bracket)?

TechSpareWarehouse (our own store) lists M3 x 8mm, which matches the length in the records above.

GCX barcode scanner adapter kit (scanner-to-bracket) screw size

M3 · 8 mm long

If you are replacing a screw on GCX barcode scanner adapter kit (scanner-to-bracket), the thread is M3, 8 mm long.

It is listed for same kit lists M3 x 8 pan head machine screws (qty 4) for scanner-to-bracket fixing.

Head and drive, as the source states them: pan head.

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

M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.

GCX barcode scanner adapter kit (scanner-to-bracket) 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
M3	8 mm	0.5 mm	Pan head	not stated	Same kit lists M3 x 8 pan head machine screws (qty 4) for scanner-to-bracket fixing	Confirmed

Fitment records and sources

M38mmconfirmed

Same kit lists M3 x 8 pan head machine screws (qty 4) for scanner-to-bracket fixing

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

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 M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.5 mm from one thread crest to the next (20 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
Length: for pan head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
The record states 8 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 M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M3

Some sewing-machine screws are labeled with metric-looking but slightly nonstandard sizes (e.g. M3.3) that are not true ISO M3 and are not interchangeable with standard M3 hardware.
Label printer parts lists write M3*6 with an asterisk; that is still a true ISO M3 x 6mm machine screw.

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 GCX barcode scanner adapter kit (scanner-to-bracket), closest length match first.

Desktop switch rack-ear kits also M3 × 8 mm
Verifone M400 payment terminal rear locking bracket access cover also M3 × 8 mm
ISO 7380 button head, small assemblies also M3 × 8 mm
Netgear Nighthawk AX8 router also M3 × 8 mm
Portable medical device enclosure also M3 × 8 mm
DAS / NAS enclosure chassis also M3 × 8 mm
Elo E458992 EMV payment terminal mount kit also M3 × 8 mm
Wurth Elektronik WA-SPAIE plastic spacer stud also M3 × 8 mm

Questions about GCX barcode scanner adapter kit (scanner-to-bracket) screws

What size screw does GCX barcode scanner adapter kit (scanner-to-bracket) use?: M3 × 8 mm for same kit lists M3 x 8 pan head machine screws (qty 4) for scanner-to-bracket fixing.
How long are the screws in GCX barcode scanner adapter kit (scanner-to-bracket)?: The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
What is the thread pitch of an M3 screw?: 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
What screwdriver do I need for GCX barcode scanner adapter kit (scanner-to-bracket)?: The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
Can I use an imperial screw instead of M3?: No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for GCX barcode scanner adapter kit (scanner-to-bracket)?: TechSpareWarehouse (our own store) lists M3 x 8mm, which matches the length in the records above.

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