![]() And, still, if you fail to determine the accurate size of the drill bit for your drywall anchor, here is. For both the molly and plastic drywall anchor, the suggested drill bit size will be 1/2. The values displayed in this table are for direct tapping without reaming. Choose the size according to the anchors’ type, for instance: If your anchor type is a toggle bolt, choose the drill bit size at 5/16 drill bit. These threads have a similar shape to regular NPT threads, but the crest and root heights are adjusted to create an interference fit, eliminating any spiral leakage path. NPTF threads, also known as Dryseal American National Standard Taper Pipe Thread, are specifically designed to achieve a more leak-free seal without relying on PTFE tape or other sealant compounds. While NPT and NPS threads can engage with each other, they do not create a proper seal when used together. On the other hand, Straight pipe threads require a gasket or O-ring to establish a seal. To ensure a proper seal, thread sealant or tape is typically necessary. NPT seal is accomplished via metal-to-metal wedging. Outside of North America US pipe threads are not as common as British Standard Pipe (BSP) threads.Īchieving a tight, leak-free joint relies on sharply angled threads. Drill Bit Size Chart Legend: Fractional Inch (1/X') Letter Drill Sizes (A-Z) Millimeter Std Sizes (0.5-25) Number Drill Sizes (1-80) Inch (dia.) Size. For your convenience, we’ve compiled a simplified chart of drill bit sizes. Some values are rounded to their nearest thousandth millimeters and ten-thousandth decimal inches. Some metric values are close enough to essentially have the same imperial counterpart. Tapered pipe threads are commonly used on pipe ends, nipples, and fittings such as couplings, elbows, and tees. Not all metric drill bits have imperial equivalents, and vice versa. However, they differ in their design: NPT threads are tapered, while NPS threads are straight (parallel). The drill size chart below contains all commonly used centre drill bit sizes. NPT and NPS threads share similarities in thread angle, shape and pitch (TPI – threads per inch).
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