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The upshear flute geometry helps pull chips away from the cutting area, reducing heat buildup and improving surface quality during high-speed machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEngineered for durability and consistent performance, this CNC ballnose router bit is ideal for sign making, mold work, engraving, and complex 3D toolpaths requiring fine detail and smooth transitions. Precision-ground for maximum accuracy and longer tool life, Centurion Tools LLC router bits are built to handle demanding production environments while maintaining sharp cutting edges and reducing machine downtime. 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With a 1-1\/8\" cut length and 3\" overall length, this solid carbide router bit delivers smooth surface finishes, efficient chip evacuation, and stable cutting performance across wood, MDF, acrylics, plastics, and composite materials. The upshear flute design helps remove chips quickly from the cutting zone, reducing heat buildup and improving overall cut quality during high-speed machining operations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eBuilt for durability and long production runs, this CNC ballnose router bit is ideal for sign makers, cabinet shops, machinists, and industrial fabricators requiring clean, curved profiles and accurate detail work. Precision-ground carbide cutting edges provide extended tool life, reduced vibration, and consistent machining performance in demanding CNC environments. 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The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520821821509,"sku":"12DS21.03","price":84.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_11.jpg?v=1554298779"},{"product_id":"downshear122","title":"1\/2\" Diameter 2 Flute 1\" Cut Length 3\" Overall Length 1\/2\" Shank Fem","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. 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The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520821985349,"sku":"12DS21.253","price":84.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_13.jpg?v=1554298785"},{"product_id":"downshear126","title":"1\/2\" Diameter 2 Flute 1-1\/4\" Cut Length 3\" Overall Length 1\/2\" Shank Fem","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822018117,"sku":"12DS21.253FEM","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DSFEM_20-_20Copy_20_4.jpg?v=1554298786"},{"product_id":"downshear127","title":"1\/2 Diameter 2 Flute 1-1\/2\" Cut Length 3-1\/2\" Overall Length 1\/2\" Shank Plunge End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822083653,"sku":"12DS21.53.5","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1.jpg?v=1554298790"},{"product_id":"downshear128","title":"1\/2 Diameter 2 Flute 1-1\/2\" Cut Length 3-1\/2\" Overall Length 1\/2\" Shank Fem End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822116421,"sku":"12DS21.53.5FEM","price":104.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DSFEM_20-_20Copy_20_5.jpg?v=1554298791"},{"product_id":"downshear129","title":"1\/2 Diameter 2 Flute 1-5\/8\" Cut Length 3-1\/2\" Overall Length 1\/2\" Shank Plunge End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822181957,"sku":"12DS21.6253.5","price":104.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_14.jpg?v=1554298793"},{"product_id":"downshear130","title":"1\/2 Diameter 2 Flute 1-5\/8\" Cut Length 3-1\/2\" Overall Length 1\/2\" Shank Fem End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822214725,"sku":"12DS21.6253.5FEM","price":104.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DSFEM_20-_20Copy_20_6.jpg?v=1554298794"},{"product_id":"downshear131","title":"1\/2 Diameter 2 Flute 1-3\/4\" Cut Length 4\" Overall Length 1\/2\" Shank Plunge End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822247493,"sku":"12DS21.754","price":109.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_15.jpg?v=1554298796"},{"product_id":"downshear132","title":"1\/2 Diameter 2 Flute 1-3\/4\" Cut Length 4\" Overall Length 1\/2\" Shank Fem End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822280261,"sku":"12DS21.754FEM","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DSFEM_20-_20Copy_20_8.jpg?v=1554298798"},{"product_id":"downshear133","title":"1\/2 Diameter 2 Flute 2\" Cut Length 4\" Overall Length 1\/2\" Shank Plunge End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822640709,"sku":"12DS22.04","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_16.jpg?v=1554298800"},{"product_id":"downshear134","title":"1\/2 Diameter 2 Flute 2\" Cut Length 4\" Overall Length 1\/2\" Shank Fem End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822673477,"sku":"12DS22.04FEM","price":119.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DSFEM_20-_20Copy_20_7.jpg?v=1554298801"},{"product_id":"downshear135","title":"1\/2 Diameter 2 Flute 2-1\/8\" Cut Length 4\" Overall Length 1\/2\" Shank Plunge End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822706245,"sku":"12DS22.1254","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_17.jpg?v=1554298802"},{"product_id":"downshear136","title":"1\/2 Diameter 2 Flute 2-1\/8\" Cut Length 4\" Overall Length 1\/2\" Shank Fem End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822739013,"sku":"12DS22.1254FEM","price":119.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DSFEM_20-_20Copy_20_9.jpg?v=1554298804"},{"product_id":"downshear137","title":"1\/2 Diameter 2 Flute 2-1\/4\" Cut Length 4\" Overall Length 1\/2\" Shank Plunge End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822771781,"sku":"12DS22.254","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DS1_20-_20Copy_20_18.jpg?v=1554298805"},{"product_id":"downshear138","title":"1\/2 Diameter 2 Flute 2-1\/4\" Cut Length 4\" Overall Length 1\/2\" Shank Fem End","description":"\u003cp\u003eThe down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.\u003c\/p\u003e","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822870085,"sku":"12DS22.254FEM","price":124.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/12DSFEM.jpg?v=1554298808"},{"product_id":"downshear1411","title":"1\/4 Diameter 2 Flute 1\" Cut 2-1\/2 Length Fem End","description":"","brand":"Centurion Tools","offers":[{"title":"Default Title","offer_id":19520822902853,"sku":"14DS21.02.5FEM","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/products\/14DS21.02.5FEM_20-_20Copy_20_7.jpg?v=1554298809"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0051\/5932\/1669\/collections\/up-shear-o-flute_80dc98c1-297c-4447-a316-29ca9ff280b3.jpg?v=1780313363","url":"https:\/\/www.centuriontools.com\/collections\/upshear-bits.oembed?page=10","provider":"Centurion Tools LLC","version":"1.0","type":"link"}