What size screw does Keystone metric nylon standoff use?

M2.5 × 4 mm for metric nylon standoff table lists M2.5 thread size.

How long are the screws in Keystone metric nylon standoff?

The record gives 4 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 Keystone metric nylon standoff?

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 Keystone metric nylon standoff?

TechSpareWarehouse (our own store) lists M2.5 x 4mm, which matches the length in the records above.

Keystone metric nylon standoff screw size

M2.5 · 4 mm long

Our records put Keystone metric nylon standoff on M2.5 screws, 4 mm long.

It is listed for metric nylon standoff table lists M2.5 thread size.

This entry is marked confirmed and comes from yic-electronics.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.

Keystone metric nylon standoff 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	4 mm	0.45 mm	not stated	not stated	Metric nylon standoff table lists M2.5 thread sizethread-locking patch	Confirmed

Fitment records and sources

M2.54-5mm head dimsconfirmed

Metric nylon standoff table lists M2.5 thread size

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

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). 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 4 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

Commonly confused with imperial 4-40 screws in older medical equipment, but modern GE/Mindray devices explicitly list M2.5 metric threads.
Nylon-coated M2.5 screws (ThinkPad Edge) are thread-locking; plain replacements work loose over time.

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 Keystone metric nylon standoff, closest length match first.

ASUS Chromebox 4 (CN66) also M2.5 × 4 mm
HP EliteBook 725 G3 also M2.5 × 4 mm
Keystone Electronics metric nylon standoff also M2.5 × 4 mm
HP EliteBook 840 G2 / 740 G2 / ZBook 14 G2 also M2.5 × 4 mm
HP Pavilion also M2.5 × 4 mm
PW-Sat2 CubeSat secondary structure and panels also M2.5 × 4 mm
Lenovo IdeaPad also M2.5 × 4 mm
ASUS ZenBook / VivoBook / TUF also M2.5 × 4 mm

Questions about Keystone metric nylon standoff screws

What size screw does Keystone metric nylon standoff use?: M2.5 × 4 mm for metric nylon standoff table lists M2.5 thread size.
How long are the screws in Keystone metric nylon standoff?: The record gives 4 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 Keystone metric nylon standoff?: 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 Keystone metric nylon standoff?: TechSpareWarehouse (our own store) lists M2.5 x 4mm, which matches the length in the records above.

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