Определение tack bolt в Английский Язык Английский Язык словарь
In steel structures composed of double angles back- to- back have spacer bar between the connecting legs, which is welded at intervals. Alternately stitch bolts, washers and ring fills are placed between the angles to keep them at the proper distance apart. Such connections are called tack connections and the term tack welding or tack bolting are used