{"product_id":"hss-counterbore-set-pilot-m3-m20","title":"Counterbore Set - HSS Pilot Counterbores for M3-M20 Cap Screws, 5 or 7-Piece Kit or Single Sizes","description":"\u003cp\u003eThis \u003cstrong\u003ecounterbore set\u003c\/strong\u003e covers metric socket head cap screws with HSS 4 flute pilot counterbores. Buy a 5 or 7-piece kit for the common sizes, or a single size from M3 to M20 to replace a worn cutter.\u003c\/p\u003e\n\u003cp\u003eThe pilot follows the drilled clearance hole and the cutter leaves a flat-bottom recess for the screw head. Use it in a drill press, milling machine or CNC center.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: 4 flute pilot counterbore, high-speed steel (HSS)\u003c\/li\u003e\n\u003cli\u003eKits: 5-piece or 7-piece counterbore set\u003c\/li\u003e\n\u003cli\u003eSingle sizes, full ground: M3, M4, M5, M6, M8, M10, M12, M14, M16, M18 and M20\u003c\/li\u003e\n\u003cli\u003eSingle sizes, standard (pilot x cutter): M3 3.2 x 5.9mm, M4 4.2 x 7.4mm, M5 5.2 x 8.9mm, M6 6.2 x 10mm, M8 8.2 x 13.4mm, M10 10.3 x 16.8mm, M12 12.4 x 18.8mm, M14 14.4 x 24mm, M16 16.5 x 26mm\u003c\/li\u003e\n\u003cli\u003eWorkpiece materials: copper, aluminum, tool steel, cast iron and wood\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing an option\u003c\/h3\u003e\n\u003cp\u003eFull ground and standard cutters are listed separately because their dimensions differ; the standard versions list the pilot and cutter diameters. A kit is the simplest way to cover several screw sizes at once.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is a counterbore used for?\u003c\/strong\u003e\u003cbr\u003eIt enlarges the top of a drilled hole with a flat bottom so a socket head cap screw sits flush or below the surface.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I drill the hole first?\u003c\/strong\u003e\u003cbr\u003eYes. Drill the clearance hole for the screw, then counterbore it; the pilot needs the hole to stay centered.\u003c\/p\u003e","brand":"Belvik Tools","offers":[{"title":"M5 - Full Ground","offer_id":50638958002241,"sku":"200007763:201441035;200182270:168#M5 Full Grind","price":14.99,"currency_code":"USD","in_stock":true},{"title":"M6 - Full Ground","offer_id":50638958035009,"sku":"200007763:201441035;200182270:172#M6 Full Grind","price":16.99,"currency_code":"USD","in_stock":true},{"title":"M8 - Full Ground","offer_id":50638958067777,"sku":"200007763:201441035;200182270:100016939#M8 Full Grind","price":17.99,"currency_code":"USD","in_stock":true},{"title":"M10 - Full Ground","offer_id":50638958100545,"sku":"200007763:201441035;200182270:100016940#M10 Full Grind","price":20.99,"currency_code":"USD","in_stock":true},{"title":"M12 - Full Ground","offer_id":50638958133313,"sku":"200007763:201441035;200182270:100016941#M12 Full Grind","price":24.99,"currency_code":"USD","in_stock":true},{"title":"M14 - Full Ground","offer_id":50638958166081,"sku":"200007763:201441035;200182270:100016942#M14 Full Grind","price":58.99,"currency_code":"USD","in_stock":true},{"title":"M16 - Full Ground","offer_id":50638958198849,"sku":"200007763:201441035;200182270:100016943#M16 Full Grind","price":65.99,"currency_code":"USD","in_stock":true},{"title":"M18 - Full Ground","offer_id":50638958231617,"sku":"200007763:201441035;200182270:100016944#M18 Full Grind","price":76.99,"currency_code":"USD","in_stock":true},{"title":"M3 - Full Ground","offer_id":50638958264385,"sku":"200007763:201441035;200182270:166#M3 Full Grind","price":11.99,"currency_code":"USD","in_stock":true},{"title":"M4 - Full Ground","offer_id":50638958297153,"sku":"200007763:201441035;200182270:167#M4 Full Grind","price":13.99,"currency_code":"USD","in_stock":true},{"title":"M14 - 14.4mm Pilot x 24mm Cutter","offer_id":50638958329921,"sku":"200007763:201441035;200182270:200000529#14.4x24x12x80","price":55.99,"currency_code":"USD","in_stock":true},{"title":"M16 - 16.5mm Pilot x 26mm Cutter","offer_id":50638958362689,"sku":"200007763:201441035;200182270:200007159#16.5x26x12x93","price":61.99,"currency_code":"USD","in_stock":true},{"title":"5pc Set","offer_id":50638958395457,"sku":"200007763:201441035;200182270:200007162#5pcs set","price":60.99,"currency_code":"USD","in_stock":true},{"title":"7pc Set","offer_id":50638958428225,"sku":"200007763:201441035;200182270:200172958#7pcs set","price":87.99,"currency_code":"USD","in_stock":true},{"title":"M20 - Full Ground","offer_id":50638958460993,"sku":"200007763:201441035;200182270:100016945#M20 Full Grind","price":81.99,"currency_code":"USD","in_stock":true},{"title":"M3 - 3.2mm Pilot x 5.9mm Cutter","offer_id":50638958493761,"sku":"200007763:201441035;200182270:100016946#3.2x5.9x6x50","price":11.99,"currency_code":"USD","in_stock":true},{"title":"M4 - 4.2mm Pilot x 7.4mm Cutter","offer_id":50638958526529,"sku":"200007763:201441035;200182270:100016947#4.2x7.4x6x50","price":11.99,"currency_code":"USD","in_stock":true},{"title":"M5 - 5.2mm Pilot x 8.9mm Cutter","offer_id":50638958559297,"sku":"200007763:201441035;200182270:100016948#5.2x8.9x8x51","price":11.99,"currency_code":"USD","in_stock":true},{"title":"M6 - 6.2mm Pilot x 10mm Cutter","offer_id":50638958592065,"sku":"200007763:201441035;200182270:100016949#6.2x10x10.4x58","price":13.99,"currency_code":"USD","in_stock":true},{"title":"M8 - 8.2mm Pilot x 13.4mm Cutter","offer_id":50638958624833,"sku":"200007763:201441035;200182270:100016950#8.2x13.4x12x60","price":17.99,"currency_code":"USD","in_stock":true},{"title":"M10 - 10.3mm Pilot x 16.8mm Cutter","offer_id":50638958657601,"sku":"200007763:201441035;200182270:200000527#10.3x16.8x12x74","price":19.99,"currency_code":"USD","in_stock":true},{"title":"M12 - 12.4mm Pilot x 18.8mm Cutter","offer_id":50638958690369,"sku":"200007763:201441035;200182270:200000528#12.4x18.8x12x83","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/2801\/6961\/files\/S242ba2d78a0b4031aa2696110aa7a714i.webp?v=1792628908","url":"https:\/\/belviktools.com\/products\/hss-counterbore-set-pilot-m3-m20","provider":"Belvik Tools","version":"1.0","type":"link"}