undefined undefined undefined undefined 1, treads Description: steel grating treads are non-slip and side plus a combination of deep-processed products. Mainly used as stepping on ladders, it is usually referred to as stair treads. 2, treads Specifications: treads T325 / 30/100: The applicable treads no more than 900mm width greater than 500mm treads T255 / 30/100: The applicable treads 800mm width greater than the width of not more than 1500mm treads; 0.5 ~ 1.0m. 3, the type of treads; (1), the installation; a fixed welding, soldering fixed treads that general steel grating, two bolts, steel grating stepping 65X5mm plus the flat as plates. (2), in accordance with the requirements of non-slip treads can be divided into two kinds of the front fender (checkered or bars) treads and no front fender of the treads. For safety reasons, we recommend that customers use with the front fender of the treads. Recommended for safety reasons on both sides of the front side panels and a front fender of T4 models of treads. Treads model, welding fixed: ST1, ST3, ST5 bolts:.. ST2, ST4, ST6 treads mark and tolerance .ST4 - (RA325 / 30) Steel Grating model 4, treads quality requirements: (1) , treads tolerance requirements: total length difference treads the range [0 - (- 3) mm], treads treads width tolerance range is [(-3mm) -3mm]. (2), treads welding requirements: the front fender and edging with each bearing bars by welding seam is not less than 3mm of fillet welds.