Home › Metric Fine Bolts › M20×1.5
M20×1.5 fine pitch bolt size
30 mm wrench
wrench size for M20×1.5 fine pitch bolt
M20×1.5 fine pitch bolt — Automotive, precision machinery.
Full specification
| System | Metric fine |
| Nominal diameter | 20 mm |
| Thread pitch (fine) | 1.5 mm |
| Wrench size | 30 mm |
| Tap drill | 18.5 mm |
| Clearance hole | 22 mm |
| Common grade / class | 10.9 |
| Typical torque | 350 Nm (258.1 ft·lb) |
🔧 Torque unit converter
Pre-filled with typical torque for M20×1.5 (10.9).
About M20×1.5 fine pitch bolts
Automotive, precision machinery.
Fine pitch threads (1.5 mm) have more threads per unit length than coarse threads. This provides:
- Better resistance to vibration loosening
- Finer adjustment capability
- Higher tensile stress area (stronger)
- More susceptible to galling and thread damage
Common applications include automotive engines, aerospace, and precision machinery where vibration resistance is critical.
Frequently asked questions
- What size wrench fits M20×1.5 bolt?
- M20×1.5 bolt uses a 30 mm wrench.
- What is the torque for M20×1.5 bolt?
- Typical torque for M20×1.5 bolt in 10.9 is about 350 Nm (258.1 ft·lb).
- What is the difference between fine and coarse thread?
- Fine thread (1.5 mm pitch) has more threads per unit length than coarse thread. Fine threads offer better vibration resistance and finer adjustment.