规定了有头螺钉、沉头螺钉、钮扣头螺钉、带肩螺钉（脱料器螺栓）和定位螺钉的尺寸、公差和一般要求，以及它们的机械性能和标称长度增量。还给出了扳手键的尺寸和要求。交叉引用:BS 18BS 84BS 93BS 860BS 1580BS 2779BS 3382

Specifies dimensions, tolerances and general requirements for cap screws, countersunk-head screws, button-head screws and shoulder screws (stripper bolts) and set screws, also their mechanical properties and nominal length increments. Dimensions and requirements for wrench keys are also given.Cross References:BS 18BS 84BS 93BS 860BS 1580BS 2779BS 3382