HP ProBook 645 G4 screw size

HP ProBook 645 G4 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.

How to check the screw before you buy

1. 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).
2. Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). This device also uses M2.5 / M3, so measure each screw rather than assuming they match.
3. Pitch: 0.4 mm from one thread crest to the next (25 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
4. Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
5. The records span 1.6–6 mm, which means different positions take different lengths — match each hole to its own screw.
6. Driver: the source names a Phillips drive. For comparison, standard M2 heads take PH0 (Phillips) or T6 (Torx), or a 1.5 mm hex key.
7. Tightening: no device-specific torque is published in these records. The site's general figure for M2 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.

Pitch gauge · Screw size finder · Torque guide

More in Laptops & PCs

The same screw also fits

Devices whose records share a thread with HP ProBook 645 G4, closest length match first.

• HP nx8220 (nw8240 page id 462857; one guide covers all three) also M2 × 2 mm
• Lenovo ideapad 710S-13IKB also M2 × 2 mm
• Lenovo ideapad 320L-14IKB also M2 × 3 mm
• Lenovo ThinkPad X13 Gen 4 also M2 × 2.5 mm
• HP 13-4100 through 4199) also M2 × 2 mm
• Lenovo ThinkPad X1 Extreme 2nd also M2 × 2 mm
• Dell Inspiron 15 3530 (without USB Type-C) also M2 × 2 mm
• Acer Aspire 4930G also M2 × 3 mm

Questions about HP ProBook 645 G4 screws

What size screw does HP ProBook 645 G4 use?

M2 × 1.6 mm for display (qty 4, Phillips); M2 × 2 mm for power button (qty 1, Phillips); M2 × 2 mm for touchpad (qty 5, Phillips); M2 × 2.5 mm for card reader (qty 3, Phillips); M2 × 2.5 mm for chassis/frame (qty 2, broadhead, Phillips); M2 × 3 mm for I/O board (qty 1, Phillips); M2 × 3 mm for display (qty 1, Phillips); M2 × 3 mm for fan (qty 1, captive, Phillips); M2 × 3 mm for power button (qty 1, Phillips); M2 × 3 mm for SSD (qty 1, Phillips); M2 × 3 mm for wireless card (qty 1, Phillips); M2.5 × 3 mm for display (qty 3, Phillips); M2.5 × 3 mm for speaker (qty 2, Phillips); M2.5 × 5 mm for hinge (qty 6, Phillips); M2.5 × 6 mm for chassis/frame (qty 14, Torx T8); M3 × 3 mm for hard drive (.

How long are the screws in HP ProBook 645 G4?

The records range from 1.6 to 6 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M2 screw?

0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.

What screwdriver do I need for HP ProBook 645 G4?

The source lists a Phillips and Torx T8 drive. Standard M2 heads otherwise take PH0 (Phillips) or T6 (Torx), or a 1.5 mm hex key.

Can I use an imperial screw instead of M2?

No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for HP ProBook 645 G4?

TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 2.5mm and M2 x 3mm, which match lengths in the records above.