Bottoming Taps are a low cost option useful for thread repair and occasional hand tapping they can thread holes in most metal and plastic but will have a shorter tool life than standard HSS taps. Not recommended in high usage production envirnoments Features / Benefits: The straight flute is the standard style of tap and is available in 3 types: Taper Intermediate and Bottom all 3 are suitable for a range of different tapping applications. As this basic tap will give acceptable performance in most materials and for medium sized production runs it is usually the most economical tap to use. It can be especially beneficial when cutting short chipping material such as cast iron. A straight flute tap can be used in through or blind holes. Used when referring to Metric parts. For example a thread pitch of 1.50mm means that the distance between one thread and the next is 1.50mm Thread Pitch (Imperial):TPI stands for “threads per inch” which literally means the number of threads within each inch on a screw a bolt or a fastener. To determine the TPI of a screw you simply count the number of threads contained within an inch of length. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.