Some bullet-nose connections have a soft tipped nipple or an O-ring on the nipple to improve the seal. This allows the connection to be made without a wrench, using a nut equipped with a hand wheel. These connections are called hand-tight connections.

• 一些弹头接头具有一个软头管接口或在管接口上有一个O形圈，以改善密封。这使得不用扳手，而是使用带手轮的螺母就可以进行连接。这些接头称为手紧接头。