20.5.6 Dynamo Eyebolts

  1. Dynamo eyebolts are commonly fitted to the casings of plant, such as electric motors, by the manufacturers as they provide inexpensive lifting points. It is from this use that they derive their name. They are extremely limited in their use as their SWL is lower than that of the collar eyebolt for axial loading and they cannot be used for angular loading.

  2. Dynamo eyebolts may be used for axial lifting only and therefore may not be used in pairs unless steps are taken to guarantee this condition. Loading by even 5° out of the axial causes undue stress on the screw thread and shank. Extreme care must be taken to avoid tilting when a single eyebolt is being used. Where axial lifting cannot be ensured, an eyebolt with link or collar eyebolt must be used. If more than one dynamo eyebolt is used to lift the load, a lifting beam will be required to facilitate axial loading. Extreme care is however still required to ensure the load does not tilt resulting in non-axial loading.

  3. The dynamo eyebolt is designed to accept a hook of similar capacity without the need for an intermediate component.

  4. Dynamo eyebolts must NOT be used for trunnion lifting.