Bolt: lifting eye

ISO 3266

ISO 3266 - Forged steel eyebolts grade 4

Forged steel eyebolts grade 4 for general lifting purposes, forged in one piece. The eyebolt is screwed into a tapped hole until its collar seats flat on the part, and the load is taken by the eye above the collar; a shackle of the same working load limit couples straight into that eye, which is what makes the eyebolt a lifting point rather than a fastener. A size is the thread alone: it fixes the working load limit WLL in axial loading, and the load in turn fixes the eye - the bore E that a shackle pin passes through and the section F that fits between the shackle jaws. The threaded shank H measures 1,5 d from the underside of the collar, the distance s to the first thread is a quarter of the thread diameter, and the collar B is the flat seat the part has to offer around the hole. Covers threads M8 to M64 with coarse pitch and M72x6 to M100x6 with fine pitch, with working load limits from 0,2 t to 50 t. Table 2 marks E, B and r as minimum values and F as a maximum; H and s have no min/max qualifier. H is the shank length below the seating face. The height above the seating face is not specified by ISO 3266. DIN 580 is a separate standard with its own dimensions. Grade 4 eyebolts are made for use between -20 °C and 200 °C; a pair of them may also be loaded at an angle to their axes, which lowers the load they may carry. The current text is the 2010 edition with Amendment 1 of 2015; it replaced the first edition of 1984, which rated the same threads lower and drew a larger eye for lifting hooks instead of shackles.