3/16英寸及以下尺寸的尺寸、公差和一般要求。包括以下类型的螺钉:90度沉头和凸出沉头、圆形、平底、带槽和凹头的奶酪和蘑菇。尺寸小于3/16英寸的六角头螺钉和六角精密螺母尺寸附录；沉头平齐度规；凹头标准测点的穿透；尺寸公式；标准尺寸的桌子。交叉参考:BS 57BS 84BS 1473BS 1475BS 1476BS 1580BS 1981BS 2827BS 3643BS 4183手册第18号

Dimensions, tolerances and general requirements for sizes above and below 3/16 in. Covers screws of the following types: 90 degrees countersunk and raised countersunk, round, pan, cheese and mushroom with slotted and with recessed heads. Appendices on dimensions of hexagon head screws and hexagon precision nuts in sizes below 3/16 inch; flushness gauge for countersunk heads; penetration of standard gauge points for recessed heads; formulae for dimensions; tables of standard sizes.Cross References:BS 57BS 84BS 1473BS 1475BS 1476BS 1580BS 1981BS 2827BS 3643BS 4183Handbook No. 18