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M16 flange bolt size
24 mm wrench
across-flats spanner / socket size for M16 flange
M16 flange bolt — heavy machinery and trucks.
Full specification
| System | Metric flange |
| Nominal diameter | 16 mm |
| Thread pitch | 2.0 mm |
| Wrench / spanner (across flats) | 24 mm |
| Tap drill | 14.0 mm |
| Clearance hole | 17.5 mm |
| Common grade / class | 10.9 |
| Typical torque | 230 Nm (170 ft·lb) |
| Closest other-system size | ~5/8 inch flange |
🔧 Torque unit converter
Pre-filled with the typical torque for M16 flange (10.9, dry). Edit any field to convert.
⚠️ Torque values here are general references for 10.9 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 M16 flange
M16 flange bolts handle heavy truck and machinery flanged joints.
Use a calibrated torque wrench — flange bolts rely on accurate clamp load.
Frequently asked questions
- What size wrench or spanner fits M16 flange?
- M16 flange bolt uses a 24 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M16 flange?
- A typical tightening torque for M16 flange bolt in 10.9 on dry threads is about 230 Nm (170 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M16 flange use?
- M16 flange bolt has a thread pitch of 2.0 mm and uses a 14.0 mm tap drill, with a 17.5 mm clearance hole.