HP ProBook 6440b screw size

HP ProBook 6440b 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. A screw that is even 1 mm too long in a laptop base can push into the keyboard, battery or a board trace, so match the length position by position.
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 / M5, 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 3–13 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 6440b, closest length match first.

• Lenovo ThinkPad E14 Gen 7 also M2 × 5 mm
• Lenovo ThinkPad E565 also M2 × 3 mm
• Dell Vostro 15 3530 also M2 × 3 mm
• HP EliteBook 850 G4 also M2 × 3 mm
• Acer Aspire 7715Z also M2 × 3 mm
• Dell Inspiron 11 3180 also M2 × 3 mm
• Lenovo YOGA 3-1170 also M2 × 5 mm
• Acer TravelMate 4020 also M2.5 × 6 mm

Questions about HP ProBook 6440b screws

What size screw does HP ProBook 6440b use?

M2 × 3 mm for hinge (qty 8, Phillips); M2 × 3 mm for optical drive (qty 3, Phillips); M2 × 3 mm for palm rest (qty 5, Torx T8); M2 × 3 mm for power button (qty 2, Phillips); M2 × 3 mm for unspecified (qty 3, Phillips); M2 × 5 mm for unspecified (qty 1, black, Phillips); M2 × 6 mm for memory (qty 1, captive, black, Phillips); M2 × 6 mm for unspecified (qty 2, captive, black, Phillips); M2 × 6 mm for wireless card (qty 2, captive, black, Phillips); M2.5 × 11 mm for display (qty 4, black, Torx T8); M2.5 × 11 mm for keyboard (qty 3, captive, black, Phillips); M2.5 × 11 mm for optical drive (qty 1, captive, black, Phillips); M2.5 × 11 mm for palm rest (qty 2, Torx T8); M2.5 × 13 mm for unspecifie.

How long are the screws in HP ProBook 6440b?

The records range from 3 to 13 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 6440b?

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 6440b?

TechSpareWarehouse (our own store) lists M2 x 3mm, M2 x 5mm and M2 x 6mm, which match lengths in the records above.