Lacing refers to leaf chain plate structure. The diagram above illustrates a 2x3 lacing. This means that it consists of 2 outer plates and 3 inner plates.
Leaf chain is a type of industrial chain consisting of interleaved plates joined by riveted pins. It is typically used in forklift trucks and for other lifting applications.
LOLER is short for Lifting Operations and Lifting Equipment Regulations 1998. LOLER covers leaf chains, slings and eyebolts as well as the equipment that uses them e.g. forklift trucks, cranes, mobile elevated platforms and vehicle inspection platform hoists. LOLER requires that lifting apparatus is strong and stable enough for the particular use and marked to indicate safe working loads; positioned and installed to minimise any risks; used safely, i.e. the work is planned, organised and performed by competent people; and subject to ongoing thorough examination and, where appropriate, inspection by competent people. Lifting equipment is also subject to PUWER regulations.
Loose fit is when a plate has no press fit with the corresponding outer plate.