M8 Eye Bolts is the m8-thread variant of Eye Bolts manufactured to DIN 580. This page focuses on the data engineers reach for at the bench: dimensional values for the M8 size, the spanner/drive that fits, and the assembly data you need to install it.
M8 Dimensional Row (DIN 580)
| Thread size | Pitch (mm) | Ring inside diameter d (mm) | Ring outside diameter (mm) | Thread length (mm) | Max load vertical (kg) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| M8 | 1.25 | 25 | 45 | 16 | 140 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
Spanner & Drive for M8 Eye Bolts
Drive geometry for M8 Eye Bolts is given by the row above; match the tool to the listed values.
Hole Sizes for M8
| Coarse-thread pitch (ISO 724) | 1.25 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 9 mm |
| Tapping drill, coarse thread | 6.8 mm |
Tightening Torque for M8
| Class 8.8 (dry, ~µ 0.125) | ≈ 25 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 35 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 41 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Common Applications for M8 Eye Bolts
M8 Eye Bolts are commonly specified for general-purpose machinery, jigs, fixturing and light structural connections.
Mating Parts for M8
For M8, pair with a M8 hex nut (ISO 4032 / DIN 934) and, where used, a M8 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
When to Step Up or Down from M8
When the joint preload approaches the proof load of M8 class 8.8, step up to M10 class 8.8 (or move to M8 class 10.9). When the joint is over-specified, M6 often saves weight and cost without losing the safety margin.