Shackles There are two types of shackles commonly used in rigging. They are the Anchor (Bow type) shackle and Chain ("D" type) shackle, both of which are available with screw pins or round pins. Shackles, like most other rigging hardware are sized by the diameter of the steel in the bow section rather than the pin size. They should only be of forged alloy steel. Never replace the shackle pin with a bolt. bolts are not intended to take the bending that is normally applied to the pin. All pins must be straight and all screw pins must be completely seated. Cotter pins must be used with all round pin shackles. Pack the pin with washers / spacers to centralize the shackle. Tackle Regulations, Part IV, Cargo Gear, 21(8): All chains......and all rings, hooks, shackles, swivels and pulley blocks shall be inspected by a competent person immediately before each occasion on which they are used in hoisting or lowering, unless they have been inspected within the preceding three months. A Few Tips: - Ensure each shackle can be matched to a certificate. - If a shackle is part of a unit that has been tested as a unit, ensure the shackle is marked to indicate this. Then, if the shackle is used independently it can still be identified and returned to its unit when needed. - Clean all components completely before inspection. - Look for bending of the pins. If bending is not obvious, roll the pin on a flat surface. - Inspect the pin and the shackle for wear and impact damage which will show as peening of the wear surfaces. - This is also an ideal opportunity to take photos of, or sketch, anything unusual. This may be of use in the future. - Make notes of what you found, where you found it and what, if anything, you did about it. - Renew any tags or stamps that identify the shackle. - Lubricate as necessary and re-install. - Ensure the cotter pin is in good condition and the pin is well-seated. Refer to the Construction Safety Association of Ontario "Rigging Manual", Chapter 4, Rigging Hardware - Shackles.