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M2.5 bolt size
5 mm wrench
across-flats spanner / socket size for M2.5
M2.5 bolt — small electronics and laptop fastener.
Full specification
| System | Metric coarse |
| Nominal diameter | 2.5 mm |
| Thread pitch | 0.45 mm |
| Wrench / spanner (across flats) | 5 mm |
| Tap drill | 2.05 mm |
| Clearance hole | 2.9 mm |
| Common grade / class | 8.8 |
| Typical torque | 0.7 Nm (0.5 ft·lb) |
| Closest other-system size | ~#3 imperial |
🔧 Torque unit converter
Pre-filled with the typical torque for M2.5 (8.8, dry). Edit any field to convert.
⚠️ Torque values here are general references for 8.8 on clean, dry threads. Lubrication, coatings, and the joint material change the figure significantly. For structural, automotive, or safety-critical work, always use the torque specified by the manufacturer or engineer.
About M2.5
M2.5 is the standard thread for many laptops, motherboards and small panels.
Keep a magnetic precision driver handy — M2.5 screws are easy to drop and lose.
Frequently asked questions
- What size wrench or spanner fits M2.5?
- M2.5 bolt uses a 5 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M2.5?
- A typical tightening torque for M2.5 bolt in 8.8 on dry threads is about 0.7 Nm (0.5 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M2.5 use?
- M2.5 bolt has a thread pitch of 0.45 mm and uses a 2.05 mm tap drill, with a 2.9 mm clearance hole.