{"product_id":"npt-taps-sutton","title":"NPT TAPS SUTTON","description":"\u003cp\u003eSutton Tools offers a comprehensive range of National Pipe Taper (NPT) taps tailored for creating airtight seals in pipe fittings, available in both budget-friendly carbon steel for maintenance and high-speed steel (HSS) for industrial workshop applications.\u003c\/p\u003e\n\u003cdiv class=\"otQkpb\" role=\"heading\"\u003e\n\u003cstrong\u003eSpecification Breakdown\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/div\u003e\n\u003cul class=\"KsbFXc U6u95\"\u003e\n\u003cli class=\"Z1qcYe\"\u003e\n\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003eNPT\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: Refers to \u003cstrong class=\"Yjhzub\"\u003eNational Pipe Taper\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e, the standard American pipe thread profile. It features a 1:16 taper (0.75 inches of diameter change per foot of length) which ensures that as a fitting is screwed in, the threads jam together to create a fluid-tight joint.\u003c!--TgQPHd||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\"\u003e\n\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003e1\/8\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: This is the \u003cstrong class=\"Yjhzub\"\u003enominal pipe size\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e, not the physical dimension of the tool. The actual outer diameter at the gauge line of a 1\/8'' NPT tap is \u003cstrong class=\"Yjhzub\"\u003e0.405 inches (10.29 mm)\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e.\u003c!--TgQPHd||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\"\u003e\n\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003e27\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: Represents the thread pitch, which is \u003cstrong class=\"Yjhzub\"\u003e27 Threads Per Inch (TPI)\u003c\/strong\u003e. Each individual thread profile sits exactly 1\/27 inch (≈ 0.94 mm) apart from the next.\u003c!--TgQPHd||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\"\u003e\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003eBottoming\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: This identifies the chamfer geometry at the tip. While a standard NPT tap has a long, gradual entry taper spanning 3 to 5 threads, a bottoming tap has a very blunt tip with a chamfer of only \u003cstrong class=\"Yjhzub\"\u003e1 to 1.5 flat, truncated threads\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e. This geometry allows it to cut fully formed threads almost completely to the floor of a shallow hole.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"otQkpb\" role=\"heading\"\u003e\n\u003cstrong\u003eCritical Technical Considerations\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/div\u003e\n\u003cul class=\"KsbFXc U6u95\"\u003e\n\u003cli class=\"Z1qcYe\"\u003e\n\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003eThe NPT Depth Trap\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: Because NPT relies on a taper to seal, an NPT fitting must screw in to a specific depth to reach its tight, interference fit. If your blind hole is too shallow, a standard tap cannot go deep enough to widen the opening to the correct size. The bottoming tap solves this by positioning the required sealing diameter much closer to the tip of the tool.\u003c!--TgQPHd||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\"\u003e\n\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003eTwo-Step Threading Process\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: You \u003cstrong class=\"Yjhzub\"\u003ecannot\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e start threading a blank, smooth hole with a bottoming tap. Because it has almost no entry chamfer, it will fail to align, skid across the surface, or instantly bind and snap. You must first cut the thread as deeply as possible using a standard \u003cem class=\"eujQNb\"\u003eTaper\u003c!--TgQPHd||[]--\u003e\u003c\/em\u003e or \u003cem class=\"eujQNb\"\u003ePlug\u003c!--TgQPHd||[]--\u003e\u003c\/em\u003e NPT tap, clear out the metal chips, and then use the \u003cem class=\"eujQNb\"\u003eBottoming\u003c!--TgQPHd||[]--\u003e\u003c\/em\u003e tap to extend those threads to the floor.\u003c!--TgQPHd||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\"\u003e\u003cspan class=\"T286Pc\"\u003e\u003cstrong class=\"Yjhzub\"\u003ePre-Drill and Ream Sizes\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e: For optimal results, drill the initial hole with a \u003cstrong class=\"Yjhzub\"\u003eQ size drill bit (0.332 inches \/ 8.43 mm)\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e. Because NPT threads are tapered, it is highly recommended to follow the drill with a specialized \u003cstrong class=\"Yjhzub\"\u003e1:16 taper pipe reamer\u003c!--TgQPHd||[]--\u003e\u003c\/strong\u003e before tapping. Reaming removes the excess material at the top of the hole, drastically lowering the torque required by the tap and preventing tool breakage\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sutton Tools","offers":[{"title":"1\/8 X 27","offer_id":47945002123458,"sku":"T4871029","price":71.4,"currency_code":"AUD","in_stock":false},{"title":"1\/4 X 18","offer_id":47945002156226,"sku":"T4871372","price":99.75,"currency_code":"AUD","in_stock":true},{"title":"3\/8 X 18","offer_id":47945002188994,"sku":"T4871715","price":156.1,"currency_code":"AUD","in_stock":false},{"title":"1\/2 X 14","offer_id":47945002221762,"sku":"T4872134","price":177.45,"currency_code":"AUD","in_stock":false},{"title":"3\/4 X 14","offer_id":47945002254530,"sku":"T4872667","price":219.45,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/6335\/8914\/files\/TAPMETRIC_aa4bb893-31a8-4fef-bd74-083bfdd27638.png?v=1782194101","url":"https:\/\/www.srbindustrialsupplies.com\/products\/npt-taps-sutton","provider":"SRB INDUSTRIAL SUPPLY","version":"1.0","type":"link"}