Dynamo Eyebolt BS4278 - Metric Thread - Range 320kg to 2000kg




Dynamo Eyebolt – For all eyebolts click here.

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Dynamo eyebolt has a larger internal diameter than collared eyebolts but with a lesser capacity and are only for vertical loading.  Dynamo eyebolts are the least popular of the eyebolt family.

If you have any questions about our eyebolts or any other products, give us a call on 01525 375225.

Safety Information Sheet

  • Material: BS970-080A27 hardened and tempered
  • Safety Factor: MBL equals 5 x SWL
  • Standard: BS4278 – table 3 – 1984
  • Finish: Self-colour

Working Load Limit
Diameter Thread
a (mm)
Diameter Base
b (mm)
Diameter Eye Outside
c (mm)
Diameter Eye Inside
e (mm)
Thickness Collar
f (mm)
g (mm)
Thread Length
h (mm)

Using Eyebolts Safely

Do not attempt lifting operations unless you understand the use and limitations.

Do not use defective eyebolts. Check the thread of both the eyebolt and hole ensuring they are compatible and have enough length and are not damaged and clear of any debris which may prevent proper engagement.

Ensure the contact surface around the hole is flat, clean and perpendicular to the thread axis. Tighten the eyebolt down by hand. The eye must be in the correct plane and the collar must sit on the contact surface. Use shims but do not machine the collar or over tighten to achieve this.

A hook may engage straight into the eye of a dynamo eyebolt or the link of an eyebolt with the link. Collar eyebolts must have a shackle or link to accept hooks. The hooks must fit generously so do not wedge or force them into position.

Never reeve a sling through the eyes, links or shackles fitted to eyebolts used in pairs as this will impose a severe resultant load to the eyebolts.

Dynamo eyebolts are only for axial loading. When using eyebolts with multi-leg slings use eyebolts with links or collar eyebolts taking care to de-rate them for angular loading conditions.

Where a single eyebolt is used, use a swivel or swivel hook to prevent the eyebolt unscrewing.

Additional information

Safe Working Load (SWL) (tonnes)

0.10, 0.15, 0.25, 0.32, 0.50, 0.63, 1.00, 1.25, 1.60, 2.00, 3.20