That’s why these lower percentage are a better idea for your tap’s tool life! Thread Percentage vs Strength Chart Companies like Guhring actually recommend 60% to 70% percentage of thread for most applications because it significantly lowers the torque force required to tap without giving up much thread strength. For most applications, you can get longer tap tool life and lower likelihood of breaking a tap off in the hole by using a lower percent of thread. Most tap drill charts call out only one tap drill size, and that will produce an approximate 75 percent thread. These specifications also provide a minimum value that varies from approximately 53% to 75%, depending upon the diameter and pitch of thread. For example, American National and Unified thread specifications provide for a maximum of 83 1/3% thread. But is it okay to have less than 100% threads? In fact, many standards bodies insist on it. Now we all know what happens when we break a tap, right? Sailors would go running out of the shop if they heard the language we use in that case. Getting 95% of the strength with 1/3 the force on the tap means you’re dramatically less likely to break the tap off in the hole. But here is the real kicker: That 100% thread requires 3 times the power to tap! Why do you care? because it is the power to tap that breaks taps, for one thing. Kennametal says a 100% thread is only 5% stronger than 75% thread. In fact, they contribute surprisingly little strength. They’re pretty delicate anyway and will wear off quickly. Now suppose you ran a twist drill down the hole and shaved off some of the peaks. Imagine the fully formed internal thread. To know which drill bit size is right for your particular tapping application, you need to consider what thread percentage you want when you’re done tapping. How can that be? Well, it’s actually pretty simple. Anytime you see just one size being recommended, you know you can do better–one size does not fit all when it comes to tapping. The same is true of the size recommended on the tap and even the recommended size from the tap manufacturer. Moreover, the size recommended in most drill bit size charts is very often not the best size to use. Let’s start with an important fact–there isn’t just one drill bit size to use for a given tap size. Newsflash: There Isn’t Just One Drill Bit Size for a Tap But in this age of computers and the Internet, you can do better. If it has information on which twist drill size to use for tapping, so much the better. Make no mistake: having a good drill bit size chart (sometimes called a “drill index”) is a very handy thing indeed to have around. What’s better than a drill bit size chart? Let us help, and BTW, it’s completely free too! If you’re simply after a basic tap drill chart in Metric and Imperial measurements, or a printable pdf to hang in your workshop, continue scrolling down.īut, before you do, wouldn’t you like to hear about something that’s much better in every way? Something that’ll make it much less likely you’ll break a tap? Something a little more modern than a simple chart? Q: What are some common materials and their recommended speed settings on a pillar drill speed chart?Ī: Common materials and their recommended speed settings on a pillar drill speed chart include wood (slow speed), metal (medium speed), and plastic (fast speed).Tap Drill Chart: Metric & Imperial Size Q: How is a pillar drill speed chart used?Ī: To use a pillar drill speed chart, you need to find the type of material you are drilling and match it with the corresponding recommended speed setting on the chart. Q: Why is a speed chart important for a pillar drill?Ī: A speed chart is important for a pillar drill because using the correct speed for the material being drilled helps to achieve better results and prolong the lifespan of the drill bit. Q: What is a speed chart for a pillar drill?Ī: A speed chart for a pillar drill provides information on the recommended speed settings for drilling different materials. FAQĪ: A pillar drill, also known as a drill press, is a machine used to drill holes in various materials. It provides guidance on the optimal speeds to ensure efficient and safe drilling. A Pillar Drill Speed Chart is used to determine the recommended speed settings for different types of materials and drill bit sizes when using a pillar drill.
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